阅读说明：本技术 一种人工岛接力延伸的斜拉锚碇式悬浮隧道结构 (Oblique-pulling anchorage type suspension tunnel structure with relay extension of artificial island ) 是由 徐立新 蒋建荣 孙洪春 赵辉 邱松 杜宇 谢锦波 孙旭 于 2020-03-31 设计创作，主要内容包括：本发明公开了一种人工岛接力延伸的斜拉锚碇式悬浮隧道结构,包括一对接岸结构、水中悬浮隧道、若干座接力人工岛和拉索锚碇系统。一对接岸结构各自连接在水中悬浮隧道的两端与一对陆域斜坡隧道之间。水中悬浮隧道由多段管节连接而成；接力人工岛沿水中悬浮隧道的轴线方向间隔设置,使整个水中悬浮隧道被分成若干跨悬浮隧道。拉索锚碇系统包括若干对拉索锚碇人工岛和多组斜拉索。拉索锚碇人工岛均设在每跨悬浮隧道的两侧跨中位置；每组斜拉索设在每跨悬浮隧道与每对拉索锚碇人工岛之间；每座拉索锚碇人工岛上均设置一组岛壁拉索管道和拉索保护套管、一组拉索转向墩、拉索坡道和拉索锚碇墩；本发明的悬浮隧道结构,使水中悬浮隧道的长度大大提高。(The invention discloses a diagonal anchorage type suspension tunnel structure for relay extension of an artificial island, which comprises a butt-joint shore structure, an underwater suspension tunnel, a plurality of foundation-force artificial islands and a guy cable anchorage system. A pair of shore structures are each connected between both ends of the underwater floating tunnel and a pair of land slope tunnels. The underwater suspension tunnel is formed by connecting a plurality of sections of pipe joints; the relay artificial islands are arranged at intervals along the axial direction of the underwater suspension tunnel, so that the whole underwater suspension tunnel is divided into a plurality of cross-suspension tunnels. The guy cable anchorage system comprises a plurality of pairs of guy cable anchorage artificial islands and a plurality of groups of stay cables. The guy cable anchorage artificial islands are arranged at midspan positions on two sides of each midspan of the suspension tunnel; each group of stay cables is arranged between each span of the suspension tunnel and each pair of guy cable anchorage artificial islands; each guy cable anchorage artificial island is provided with a group of island wall guy cable pipelines, a guy cable protective sleeve, a group of guy cable steering piers, a guy cable ramp and a guy cable anchorage pier; the suspension tunnel structure of the invention greatly improves the length of the suspension tunnel in water.)

1. A diagonal anchorage type suspended tunnel structure for relay extension of an artificial island comprises a land slope tunnel, a shore connection structure, an underwater suspended tunnel, a plurality of foundation-force artificial islands and a guy cable anchorage system; the land slope tunnel comprises a pushing side land slope tunnel and a receiving side land slope tunnel; the shore connecting structures comprise pushing side shore structures and receiving side shore structures which are arranged on the pushing side coast and the receiving side coast in a one-to-one correspondence manner; the water-facing end of the pushing side land area slope tunnel and the water-facing end of the receiving side land area slope tunnel are connected with the back water end of the pushing side shore structure and the back water end of the receiving side shore structure in a one-to-one correspondence manner; the underwater suspension tunnel is formed by connecting a plurality of sections of pipe joints, each section of pipe joint is internally divided into a tunnel upper layer, a tunnel middle layer and a tunnel lower layer by an upper partition plate and a lower partition plate, and the space of the tunnel upper layer is a process chamber; the middle layer of the tunnel is a tunnel traffic room; the lower layer of the tunnel is a water supply and drainage chamber; the plurality of the artificial islands are arranged at intervals along the axial direction of the underwater suspension tunnel, so that the whole underwater suspension tunnel is divided into a plurality of cross-suspension tunnels; it is characterized in that the preparation method is characterized in that,

the top pushes away the side bank structure and includes in proper order from sea area to land area: the system comprises an underwater bank protection section, a starting section, a cave entrance section retaining wall, a cave entrance section, a waterside wall, a thrust section, a sealing section, a butt joint section, a pushing section, a horizontal transportation section and a backwater side wall; the butt joint section and the pushing section are arranged in a pipe joint connecting box which can be opened and closed; the receiving side shore structure comprises the following components from sea area to land area in sequence: the underwater retaining wall comprises an underwater bank protection section, a receiving section, a cave entrance section retaining wall, a cave entrance section, a waterside wall body, a pipe joint stabilizing section, a sealing section, a pipe joint solidifying section, a traction anchorage section and a backwater side wall body;

the multiple sections of pipe joints of the underwater suspension tunnel are connected with joint water stopping materials through pipe joint joints, joint fasteners and joint filling materials; the outer surface of the tail part of the last section of pipe joint of the last cross-suspension tunnel is solidified with the inner surface of a pipe joint connecting box in the jacking side shore structure through pouring concrete; the outer surface of the head of the first section of the pipe section of the first cross-suspension tunnel is solidified with the inner surface of the pipe section solidifying section in the receiving side shore structure through pouring concrete;

each joint artificial island is provided with a pipe joint connecting system which is arranged underground of the joint artificial island and comprises an artificial island receiving side shore structure arranged opposite to a pushing side shore and an artificial island pushing side shore structure arranged opposite to the receiving side shore; the artificial island receiving side shore structure comprises an artificial island receiving section, an artificial island receiving side island wall section, an artificial island receiving side thrust section, an artificial island anchoring connection section and an artificial island traction anchoring section which are sequentially arranged from a sea area to an island; the artificial island pushing side shore structure comprises an artificial island pushing section, an artificial island pipe joint connecting section, an artificial island pushing side thrust section, an artificial island pushing side island wall section and an artificial island starting section which are sequentially arranged from the inside of the island to the sea area; the outer surface of the head of a first section of pipe joint of a subsequent cross-suspension tunnel entering the relay artificial island is solidified with the inner surface of the anchoring connection section of the artificial island through pouring concrete; the outer surface of the tail part of the last section of pipe joint of the previous span suspension cableway left in the relay artificial island is pushed and consolidated with the inner surface of the pipe joint connecting section from the artificial island pushing section to the artificial island through pouring concrete;

the cable anchorage system adopts a bidirectional single cable plane or a bidirectional double cable plane and comprises a plurality of pairs of inclined cable anchorage artificial islands and a plurality of groups of inclined cables; each pair of guy cable anchorage artificial islands are symmetrically arranged at two sides of the midspan of each span of the suspension tunnel; each group of stay cables is arranged between each span of the suspension tunnel and each pair of guy cable anchorage artificial islands; each group of stay cables comprises a plurality of stay cables; each inclined stay cable anchorage artificial island comprises an island foundation at the lower part and a vertical island body which is composed of a cylindrical island wall and an island inner body at the upper part; each guy cable anchorage artificial island is provided with a group of island wall guy cable pipelines, a group of guy cable steering piers, a guy cable receiving room and a guy cable ramp; a group of island wall stay cable pipelines are embedded in a cylindrical island wall of the cable anchorage artificial island, and the axes of the group of island wall stay cable pipelines are consistent with the axes of a plurality of stay cables anchored on the outer surface of one side of the suspended tunnel in a one-to-one correspondence manner; the group of guy cable steering piers and the group of island wall guy cable pipelines are arranged in the guy cable anchorage artificial island in a one-to-one correspondence manner and are close to the inner wall of the cylindrical island wall; the stay cable receiving room is arranged on the ground of the island inner body of the cable anchorage artificial island, which is higher than the water surface, and the lower part of the stay cable receiving room is provided with a cable anchorage pier; the cable ramp is arranged between the group of cable steering piers and the cable anchorage pier; one ends of the plurality of stay cables are anchored on cable anchors on the outer surfaces of two sides of each span of the suspension tunnel at intervals, the other ends of the plurality of stay cables penetrate through a group of island wall cable pipelines arranged on the pair of cable anchor artificial islands one by one, then turn to the direction through a group of cable steering piers, and then extend upwards to the ground along a cable ramp, and finally are anchored on the cable anchor piers.

2. The cable-stayed anchor type suspension tunnel structure for artificial island relay extension according to claim 1,

the underwater bank protection section of the pushing side bank structure is positioned on an underwater side slope on the water side of the bank structure, and stones are thrown on the slope surface to prevent scouring;

the starting section of the jacking side shore structure is a horizontal section between the cave entrance section retaining wall and a slope top line of the underwater shore protection section, and the design elevation of the starting section is the design bottom elevation of the section of the underwater suspension tunnel to form a placing surface of two banks of the underwater suspension tunnel;

the opening section of the jacking side shore structure is arranged between the opening section retaining wall and the waterside side wall body; the opening section of the pushing side shore structure is also provided with a temporary sealing door and a corresponding water stopping device on the front side surface of the waterside wall body; the temporary sealing door is provided with a water plugging plug;

the thrust section of the pushing side shore structure is positioned at the rear side of the waterside wall body and is of a sealed box chamber structure, the top of the thrust section is provided with a manhole and an embedded cover plate, and the thrust section is internally provided with a hoop type thrust device;

the sealing section of the pushing side shore structure is positioned at the rear side of the thrust section, the sealing section is a sealing wall body provided with a wall hole, sealing hoops are respectively arranged on the front side surface and the rear side surface of the sealing wall body along the circumference of the wall hole, and a water stop strip is arranged between the wall hole and the outer surface of the pipe joint;

the butt joint section of the jacking side shore structure is positioned at the rear side of the sealing section, namely, a position which is exposed at the rear side of the sealing section and is used for butt joint with a subsequent pipe joint is left after the pipe joint is jacked forward, and the length of the butt joint section is the length of the left exposed pipe joint;

the pushing section of the pushing side shore structure is positioned at the rear side of the butt joint section, and a carrying air bag is arranged at the bottom of the pushing section; the rear part of the pushing section is provided with a pushing trolley locating section, the middle parts of two side walls of the pipe joint connecting box are respectively provided with a bracket, two brackets are respectively provided with a pushing trolley track, and the pipe joint butting positions on the two brackets of the pipe joint connecting box are provided with thrust blocks;

the length of a horizontal transportation section of the jacking side shore structure is not less than that of each section of tunnel pipe joint, and a jacking beam driven by a jack is arranged at the bottom of the horizontal transportation section;

the structures of the underwater bank protection section, the receiving section, the cave mouth section retaining wall, the cave mouth section, the waterside wall body, the sealing section and the backwater side wall body of the receiving side bank structure are the same as those of the underwater bank protection section, the starting section, the cave mouth section retaining wall, the cave mouth section, the waterside wall body, the sealing section and the backwater side wall body of the pushing side bank structure in one-to-one correspondence;

a wall hole is formed in a waterside wall body of the receiving side shore structure, and a water stopping device is arranged on the upstream face of the waterside wall body along the wall hole;

the pipe joint stabilizing section is positioned behind the waterside wall body and is of a reinforced concrete box structure, and a hoop type stabilizing device is arranged in the pipe joint stabilizing section;

the sealing section is positioned behind the pipe section stabilizing section, the sealing section is a sealing wall provided with a wall hole, and a water stopping device is also arranged on the upstream surface of the sealing wall along the wall hole;

the pipe joint fixing section is positioned behind the sealing section and is provided with a pipe joint anchoring box which can be opened and closed, the structure of the pipe joint anchoring box is the same as that of the pipe joint stabilizing section, and the tail part of the pipe joint anchoring box is provided with a steel sealing door;

the traction anchorage section is located between the steel sealing door of the pipe joint anchoring box and the backwater side wall body, a reinforced concrete abutment is arranged at the bottom of the traction anchorage section, a pile foundation is arranged below the abutment, and a traction device of a high-power traction cable is arranged on the abutment.

3. The cable-stayed anchor type suspension tunnel structure for artificial island relay extension according to claim 1,

the pipe joint is a socket joint, and a plurality of countersunk joint bolt holes are respectively uniformly distributed and correspondingly and radially formed in the outer surface of the bell mouth and the inner surface of the spigot of each section of pipe joint;

the joint fastener comprises an inner joint fastener and an outer joint fastener; the joint inner fastener is a high-strength stainless steel bolt, a nut and a gasket which are inserted in the joint bolt hole and adopts a vertical anchoring type; the joint external fastener comprises a plurality of anchorage seats which are arranged on the inner surface of each section of pipe joint and are close to the pipe orifice, and steel strands or prestressed steel bars which are connected between the anchorage seats of the two sections of butted pipe joints through anchorage devices;

the joint filling materials comprise joint gap filling materials filled between the inner surface of the bell mouth of the two sections of butted pipe joints and the outer surface of the socket and bolt hole filling materials filled in the joint bolt holes of the two sections of butted pipe joints;

the joint water stop material comprises an outer water stop ring arranged between the end surface of the socket of the two sections of butted pipe joints and the stop cover of the socket and an inner water stop ring arranged between the end surface of the socket and the stop cover of the socket.

4. The cable-stayed anchor type suspension tunnel structure for the relay extension of the artificial island according to claim 1, wherein the vertical surface of each relay artificial island comprises an island base at the lower part and a vertical island body consisting of a cylindrical island wall and an island inner body at the upper part;

the artificial island receiving section is a horizontal section from an upper-layer island base to the outside of the cylindrical island wall, and the design elevation of the artificial island receiving section is the design bottom elevation of the section of the suspended tunnel;

the section of the island wall at the receiving side of the artificial island is a reserved hole of a cylindrical island wall;

the artificial island receiving side thrust section is positioned at the front side of the artificial island receiving side island wall section and is positioned in a sealed box chamber between a receiving side thrust section front sealing wall and a receiving side thrust section rear sealing wall which are respectively provided with a wall hole, and the top of the sealed box chamber is provided with a manhole and an embedded cover plate; arranging a hoop type thrust device in the thrust section at the receiving side of the artificial island; the receiving side thrust section front sealing wall and the receiving side thrust section rear sealing wall are respectively provided with a water stopping device along one circle of the wall hole, and a water stopping strip is arranged between the wall hole and the outer surface of the pipe joint;

the artificial island anchoring connecting section is positioned at the front side of the artificial island receiving side thrust section, the artificial island anchoring connecting section is provided with an artificial island pipe joint anchoring box which can be opened and closed, and the length of the artificial island anchoring connecting section is at least the length of one section of pipe joint;

the artificial island traction anchorage section is positioned at the front side of the artificial island anchoring connection section, and a traction device of a traction cable is arranged in the artificial island traction anchorage section;

the artificial island pushing side thrust section, the artificial island pushing side island wall section and the artificial island starting section are in one-to-one correspondence with the artificial island receiving side thrust section, the artificial island receiving side island wall section and the artificial island receiving section in structure;

the artificial island pipe joint connecting section and the artificial island pushing section are both positioned in an openable and closable artificial island pipe joint connecting box;

the artificial island pipe joint connecting section is positioned at the rear side of the artificial island pushing side thrust section, namely, a position exposed at the rear side of the rear sealing wall of the pushing side thrust section for butting with a subsequent pipe joint is left after the pipe joint is pushed forwards, and the length of the artificial island pipe joint connecting section is the length of the left exposed pipe joint;

the artificial island pushing section is positioned at the rear side of the artificial island pipe joint connecting section, and a pushing trolley locating section is arranged at the rear part of the artificial island pushing section; the middle parts of two side walls of the artificial island pipe joint connecting box are respectively provided with a bracket, and the two brackets are respectively provided with a pushing trolley track;

the relay artificial island is also provided with a pipe joint supply system, the pipe joint supply system comprises a pipe joint horizontal steering section and a transportation slope way, and the pipe joint horizontal steering section is positioned between the artificial island traction anchorage section and the artificial island pushing section; the transportation slope way is perpendicular to the axis of the tunnel, the lower port of the transportation slope way is communicated with the pipe joint horizontal steering section, and the upper port of the transportation slope way is positioned on the ground of the relay artificial island.

5. The cable-stayed anchor type suspended tunnel structure for artificial island relay extension according to claim 1, wherein the number of the group of island wall cable pipelines and the number of the group of cable steering piers are the same as the number of the group of stay cables; a guy cable protective sleeve is also arranged in the inner cavity of each island wall guy cable pipeline;

the bottom of the outer end of each island wall guy cable pipeline is higher than the elevation of the underwater suspended tunnel and not higher than the minimum bottom elevation of the channel;

the bottom of each guy cable steering pier is higher than the elevation of the underwater suspended tunnel and not higher than the bottom elevation of the channel; the inner parts of the group of guy cable steering piers are respectively provided with a guy cable channel along the axial direction of the group of island wall stay cable pipelines in a one-to-one correspondence manner, and a steering cable guide device is pre-embedded in each guy cable channel;

the upper part of a stay cable anchorage pier of the stay cable receiving room is provided with a stay cable anchorage monitoring room, and a stay cable stress monitoring system is arranged in the stay cable anchorage monitoring room;

the cable anchorage pier is characterized in that one side, facing the suspension tunnel, of the cable anchorage pier is provided with a group of cable guides, the number of the group of cable guides is equal to that of the group of stay cables, a group of cable force monitoring grooves are formed in the rear of the group of cable guides in a one-to-one correspondence mode, a cable force monitor is arranged in each cable force monitoring groove, front anchorage blocks and rear anchorage blocks are arranged at the front end and the rear end of each cable force monitoring groove in a one-to-one correspondence mode, and an electric anchor machine is arranged at the rear of each rear anchorage block.

6. The cable-stayed anchorage-type suspension tunnel structure for artificial island relay extension according to claim 1, wherein the top-pushing side land slope tunnel and the receiving side land slope tunnel are both provided with an open-cut cast-in-place tunnel and a mine tunneling method tunnel in sequence from the ground downwards; the open-cut cast-in-place tunnel is provided with an open section, a grating section and a buried section from the ground downwards in sequence.

7. The cable-stayed anchor type suspension tunnel structure for artificial island relay extension according to claim 1 or 4, characterized in that the island foundation is constructed by backfilling sand in a cofferdam formed by submerging an ultra-large concrete buoyancy tank; the cylindrical island wall is formed by a steel cylindrical lattice body and a dense filler inside the steel cylindrical lattice body, and the island inner body is constructed by back-filled sand.

Technical Field

The invention relates to an underwater suspension tunnel, in particular to a cable-stayed anchorage type suspension tunnel structure for relay extension of an artificial island.

Background

The underwater suspension Tunnel is called a 'focused Floating Tunnel' in English, and is called 'SFT' for short. Also called Archimedes bridge in Italy, abbreviated as PDA bridge. Generally, the system consists of a tubular body floating in water to a certain depth (the tubular body has a large space enough to meet the requirements of road and railway traffic), a support system (anchor cables anchored on a seabed foundation, piers or a water buoyancy tank) and structures on both sides. The deep water type water-saving transport vehicle is a novel structure for the transport vehicle to cross between two banks separated by deep water, is suitable for all the transport vehicles needing to pass through the water, can pass trains, automobiles, small motor vehicles and pedestrians, and can be made into service channels for passing through various pipelines and cables. The differences between the underwater suspension tunnel and the traditional buried tunnel or tunneling tunnel are as follows: the suspended tunnel structure is surrounded by water and is neither located on nor traversing the ground, but is held in a fixed position primarily by the weight of its own structure, the buoyancy experienced by the structure, and the anchoring forces of the support system. The floating tunnel is sealed around, and the structure has all the characteristics of a common tunnel and is considered to be a tunnel rather than a bridge from the use point of view.

The floating tunnel may be used to traverse different bodies of water, such as rivers, fjords, straits, lakes, etc., providing a possible and acceptable form of fixed spanning structure for those areas that are considered non-traversable due to deep water or large shoreside distances. The suspension tunnel is built at a certain depth under water, and compared with an open channel on the water surface and ferry transportation, the suspension tunnel is not influenced by severe weather such as stormy waves, fog, rain, snow and the like. On the premise of ensuring the same navigation capacity, compared with a bridge, the suspension tunnel has a gentle slope and a reduced total length, and the suspension tunnel does not influence the environment and natural landscapes in the building process and the use; when the water depth exceeds a certain span and the water depth, the unit cost of the suspension tunnel is not obviously improved along with the increase of the span length or the water channel depth, and the unit cost of the cable-stayed bridge and the suspension bridge is obviously increased along with the increase of the span.

Although the suspension tunnel has certain advantages compared with the scheme of cross-sea passages such as immersed tube tunnels, deep-buried tunnels, bridges and the like, the design and construction of the suspension tunnel are still a worldwide problem, and no established suspension tunnel exists so far. Currently, there are mainly 7 countries (norway, italy, japan, china, swiss, brazil, usa) in the world under study, and many technical problems found by the study are mainly: overall structural arrangement, tunnel materials, anchoring system structural style, tunnel connection style and shore connection structural design, tunnel structure feasibility, construction and operation risks and the like. Whether the problems can be solved or not determines whether the suspension tunnel can be moved to actual engineering from a feasible scheme or not.

In the research on the floating tunnel, the proposed structural types can be roughly divided into three types according to the relationship between the self gravity of the floating tunnel and the received buoyancy: float type, anchor type, pier column type. The float-type suspension tunnel is formed by suspending the tunnel on a float bowl on the water surface through an anchor cable or an anchor chain, the gravity of the tunnel is greater than the buoyancy, and the vertical direction of the tunnel is greatly influenced by the fluctuation of the tide level; the anchoring type suspension tunnel is characterized in that the tunnel is anchored below a seabed on the basis of an anchorage through tension legs or anchor cables, the gravity of the tunnel is smaller than the buoyancy, and the tunnel can displace or shake under the action of hydrodynamic force; the pier column is actually a tunnel bridge supported on the underwater pier column, and the construction difficulty is high and the manufacturing cost is high. Because the tunnel floats in water, the tunnel installation construction is influenced by wind, waves, currents, ship traveling waves and the like, the underwater positioning, underwater or overwater butt joint construction difficulty of the three types of tunnels is very high, and the comfort level and the safety risk in the underwater operation period are difficult to predict.

When the length of the underwater suspension tunnel exceeds a certain range, the difficulty of the stress control of the tunnel is increased, the difficulty of ventilation and escape in the tunnel is increased continuously, and the construction risk is increased continuously. In order to provide better ventilation conditions for an ultralong underwater tunnel, shorten an escape path, reduce the construction risk of the ultralong tunnel and be more beneficial to construction period control, operation period maintenance, part replacement and remote service area construction, the cable-stayed anchorage type suspension tunnel structure adopting artificial island relay extension is particularly provided.

Disclosure of Invention

The invention aims to fill the blank of the prior art and provide a diagonal-pulling anchorage type suspension tunnel structure for relay extension of an artificial island, which has more reasonable stress, reduces the influence of adverse sea conditions in the construction period, is more favorable for control in the construction period and maintenance and part replacement in the operation period, simultaneously greatly improves the design length of an underwater suspension tunnel, solves the problems of ventilation, escape and the like of an ultra-long distance underwater suspension tunnel, and even can utilize the relay artificial island to construct a remote service area of a road.

The purpose of the invention is realized as follows: a diagonal anchorage type suspended tunnel structure for relay extension of an artificial island comprises a land slope tunnel, a shore connection structure, an underwater suspended tunnel, a plurality of foundation-force artificial islands and a guy cable anchorage system; the land slope tunnel comprises a pushing side land slope tunnel and a receiving side land slope tunnel; the shore connecting structures comprise pushing side shore structures and receiving side shore structures which are arranged on the pushing side coast and the receiving side coast in a one-to-one correspondence manner; the water-facing end of the pushing side land area slope tunnel and the water-facing end of the receiving side land area slope tunnel are connected with the back water end of the pushing side shore structure and the back water end of the receiving side shore structure in a one-to-one correspondence manner; the underwater suspension tunnel is formed by connecting a plurality of sections of pipe joints, each section of pipe joint is internally divided into a tunnel upper layer, a tunnel middle layer and a tunnel lower layer by an upper partition plate and a lower partition plate, and the space of the tunnel upper layer is a process chamber; the middle layer of the tunnel is a tunnel traffic room; the lower layer of the tunnel is a water supply and drainage chamber; the plurality of the artificial islands are arranged at intervals along the axial direction of the underwater suspension tunnel, so that the whole underwater suspension tunnel is divided into a plurality of cross-suspension tunnels; wherein the content of the first and second substances,

the top pushes away the side bank structure and includes in proper order from sea area to land area: the system comprises an underwater bank protection section, a starting section, a cave entrance section retaining wall, a cave entrance section, a waterside wall, a thrust section, a sealing section, a butt joint section, a pushing section, a horizontal transportation section and a backwater side wall; the butt joint section and the pushing section are arranged in a pipe joint connecting box which can be opened and closed; the receiving side shore structure comprises the following components from sea area to land area in sequence: the underwater retaining wall comprises an underwater bank protection section, a receiving section, a cave entrance section retaining wall, a cave entrance section, a waterside wall body, a pipe joint stabilizing section, a sealing section, a pipe joint solidifying section, a traction anchorage section and a backwater side wall body;

the multiple sections of pipe joints of the underwater suspension tunnel are connected with joint water stopping materials through pipe joint joints, joint fasteners and joint filling materials; the outer surface of the tail part of the last section of pipe joint of the last cross-suspension tunnel is solidified with the inner surface of a pipe joint connecting box in the jacking side shore structure through pouring concrete; the outer surface of the head of the first section of the pipe section of the first cross-suspension tunnel is solidified with the inner surface of the pipe section solidifying section in the receiving side shore structure through pouring concrete;

each joint artificial island is provided with a pipe joint connecting system which is arranged underground of the joint artificial island and comprises an artificial island receiving side shore structure arranged opposite to a pushing side shore and an artificial island pushing side shore structure arranged opposite to the receiving side shore; the artificial island receiving side shore structure comprises an artificial island receiving section, an artificial island receiving side island wall section, an artificial island receiving side thrust section, an artificial island anchoring connection section and an artificial island traction anchoring section which are sequentially arranged from a sea area to an island; the artificial island pushing side shore structure comprises an artificial island pushing section, an artificial island pipe joint connecting section, an artificial island pushing side thrust section, an artificial island pushing side island wall section and an artificial island starting section which are sequentially arranged from the inside of the island to the sea area; the outer surface of the head of a first section of pipe joint of a subsequent cross-suspension tunnel entering the relay artificial island is solidified with the inner surface of the anchoring connection section of the artificial island through pouring concrete; the outer surface of the tail part of the last section of pipe joint of the previous span suspension cableway left in the relay artificial island is pushed and consolidated with the inner surface of the pipe joint connecting section from the artificial island pushing section to the artificial island through pouring concrete;

the cable anchorage system adopts a bidirectional single cable plane or a bidirectional double cable plane and comprises a plurality of pairs of inclined cable anchorage artificial islands and a plurality of groups of inclined cables; each pair of guy cable anchorage artificial islands are symmetrically arranged at two sides of the midspan of each span of the suspension tunnel; each group of stay cables is arranged between each span of the suspension tunnel and each pair of guy cable anchorage artificial islands; each group of stay cables comprises a plurality of stay cables; each inclined stay cable anchorage artificial island comprises an island foundation at the lower part and a vertical island body which is composed of a cylindrical island wall and an island inner body at the upper part; each guy cable anchorage artificial island is provided with a group of island wall guy cable pipelines, a group of guy cable steering piers, a guy cable receiving room and a guy cable ramp; a group of island wall stay cable pipelines are embedded in a cylindrical island wall of the cable anchorage artificial island, and the axes of the group of island wall stay cable pipelines are consistent with the axes of a plurality of stay cables anchored on the outer surface of one side of the suspended tunnel in a one-to-one correspondence manner; the group of guy cable steering piers and the group of island wall guy cable pipelines are arranged in the guy cable anchorage artificial island in a one-to-one correspondence manner and are close to the inner wall of the cylindrical island wall; the stay cable receiving room is arranged on the ground of the island inner body of the cable anchorage artificial island, which is higher than the water surface, and the lower part of the stay cable receiving room is provided with a cable anchorage pier; the cable ramp is arranged between the group of cable steering piers and the cable anchorage pier; one ends of a plurality of stay cables are anchored on cable anchors on the outer surfaces of two sides of each span of the suspension tunnel at intervals, the other ends of the plurality of stay cables penetrate through a group of island wall cable pipelines arranged on the pair of cable anchor artificial islands one by one correspondingly, then are turned by a group of cable turning piers, then are extended upwards to the ground along a cable ramp, and finally are anchored on the cable anchor piers;

the cable-stayed anchor type suspended tunnel structure with relay extension of the artificial island is characterized in that,

the underwater bank protection section of the pushing side bank structure is positioned on an underwater side slope on the water side of the bank structure, and stones are thrown on the slope surface to prevent scouring;

the starting section of the jacking side shore structure is a horizontal section between the cave entrance section retaining wall and a slope top line of the underwater shore protection section, and the design elevation of the starting section is the design bottom elevation of the section of the underwater suspension tunnel to form a placing surface of two banks of the underwater suspension tunnel;

the opening section of the jacking side shore structure is arranged between the opening section retaining wall and the waterside side wall body; the opening section of the pushing side shore structure is also provided with a temporary sealing door and a corresponding water stopping device on the front side surface of the waterside wall body; the temporary sealing door is provided with a water plugging plug;

the thrust section of the pushing side shore structure is positioned at the rear side of the waterside wall body and is of a sealed box chamber structure, the top of the thrust section is provided with a manhole and an embedded cover plate, and the thrust section is internally provided with a hoop type thrust device;

the sealing section of the pushing side shore structure is positioned at the rear side of the thrust section, the sealing section is a sealing wall body provided with a wall hole, sealing hoops are respectively arranged on the front side surface and the rear side surface of the sealing wall body along the circumference of the wall hole, and a water stop strip is arranged between the wall hole and the outer surface of the pipe joint;

the butt joint section of the jacking side shore structure is positioned at the rear side of the sealing section, namely, a position which is exposed at the rear side of the sealing section and is used for butt joint with a subsequent pipe joint is left after the pipe joint is jacked forward, and the length of the butt joint section is the length of the left exposed pipe joint;

the pushing section of the pushing side shore structure is positioned at the rear side of the butt joint section, and a carrying air bag is arranged at the bottom of the pushing section; the rear part of the pushing section is provided with a pushing trolley locating section, the middle parts of two side walls of the pipe joint connecting box are respectively provided with a bracket, two brackets are respectively provided with a pushing trolley track, and the pipe joint butting positions on the two brackets of the pipe joint connecting box are provided with thrust blocks;

the length of a horizontal transportation section of the jacking side shore structure is not less than that of each section of tunnel pipe joint, and a jacking beam driven by a jack is arranged at the bottom of the horizontal transportation section;

the structures of the underwater bank protection section, the receiving section, the cave mouth section retaining wall, the cave mouth section, the waterside wall body, the sealing section and the backwater side wall body of the receiving side bank structure are the same as those of the underwater bank protection section, the starting section, the cave mouth section retaining wall, the cave mouth section, the waterside wall body, the sealing section and the backwater side wall body of the pushing side bank structure in one-to-one correspondence;

a wall hole is formed in a waterside wall body of the receiving side shore structure, and a water stopping device is arranged on the upstream face of the waterside wall body along the wall hole;

the pipe joint stabilizing section is positioned behind the waterside wall body and is of a reinforced concrete box structure, and a hoop type stabilizing device is arranged in the pipe joint stabilizing section;

the sealing section is positioned behind the pipe section stabilizing section, the sealing section is a sealing wall provided with a wall hole, and a water stopping device is also arranged on the upstream surface of the sealing wall along the wall hole;

the pipe joint fixing section is positioned behind the sealing section and is provided with a pipe joint anchoring box which can be opened and closed, the structure of the pipe joint anchoring box is the same as that of the pipe joint stabilizing section, and the tail part of the pipe joint anchoring box is provided with a steel sealing door;

the traction anchorage section is located between the steel sealing door of the pipe joint anchoring box and the backwater side wall body, a reinforced concrete abutment is arranged at the bottom of the traction anchorage section, a pile foundation is arranged below the abutment, and a traction device of a high-power traction cable is arranged on the abutment.

The cable-stayed anchor type suspended tunnel structure with relay extension of the artificial island is characterized in that,

the pipe joint is a socket joint, and a plurality of countersunk joint bolt holes are respectively uniformly distributed and correspondingly and radially formed in the outer surface of the bell mouth and the inner surface of the spigot of each section of pipe joint;

the joint fastener comprises an inner joint fastener and an outer joint fastener; the joint inner fastener is a high-strength stainless steel bolt, a nut and a gasket which are inserted in the joint bolt hole and adopts a vertical anchoring type; the joint external fastener comprises a plurality of anchorage seats which are arranged on the inner surface of each section of pipe joint and are close to the pipe orifice, and steel strands or prestressed steel bars which are connected between the anchorage seats of the two sections of butted pipe joints through anchorage devices;

the joint filling materials comprise joint gap filling materials filled between the inner surface of the bell mouth of the two sections of butted pipe joints and the outer surface of the socket and bolt hole filling materials filled in the joint bolt holes of the two sections of butted pipe joints;

the joint water stop material comprises an outer water stop ring arranged between the end surface of the socket of the two sections of butted pipe joints and the stop cover of the socket and an inner water stop ring arranged between the end surface of the socket and the stop cover of the socket.

The inclined-pulling anchorage type suspended tunnel structure for relay extension of the artificial island is characterized in that the vertical surface of each relay artificial island comprises an island foundation at the lower part and a vertical island body at the upper part, wherein the vertical island body consists of a cylindrical island wall and an island inner body;

the artificial island receiving section is a horizontal section from an upper-layer island base to the outside of the cylindrical island wall, and the design elevation of the artificial island receiving section is the design bottom elevation of the section of the suspended tunnel;

the section of the island wall at the receiving side of the artificial island is a reserved hole of a cylindrical island wall;

the artificial island receiving side thrust section is positioned at the front side of the artificial island receiving side island wall section and is positioned in a sealed box chamber between a receiving side thrust section front sealing wall and a receiving side thrust section rear sealing wall which are respectively provided with a wall hole, and the top of the sealed box chamber is provided with a manhole and an embedded cover plate; arranging a hoop type thrust device in the thrust section at the receiving side of the artificial island; the receiving side thrust section front sealing wall and the receiving side thrust section rear sealing wall are respectively provided with a water stopping device along one circle of the wall hole, and a water stopping strip is arranged between the wall hole and the outer surface of the pipe joint;

the artificial island anchoring connecting section is positioned at the front side of the artificial island receiving side thrust section, the artificial island anchoring connecting section is provided with an artificial island pipe joint anchoring box which can be opened and closed, and the length of the artificial island anchoring connecting section is at least the length of one section of pipe joint;

the artificial island traction anchorage section is positioned at the front side of the artificial island anchoring connection section, and a traction device of a traction cable is arranged in the artificial island traction anchorage section;

the artificial island pushing side thrust section, the artificial island pushing side island wall section and the artificial island starting section are in one-to-one correspondence with the artificial island receiving side thrust section, the artificial island receiving side island wall section and the artificial island receiving section in structure;

the artificial island pipe joint connecting section and the artificial island pushing section are both positioned in an openable and closable artificial island pipe joint connecting box;

the artificial island pipe joint connecting section is positioned at the rear side of the artificial island pushing side thrust section, namely, a position exposed at the rear side of the rear sealing wall of the pushing side thrust section for butting with a subsequent pipe joint is left after the pipe joint is pushed forwards, and the length of the artificial island pipe joint connecting section is the length of the left exposed pipe joint;

the artificial island pushing section is positioned at the rear side of the artificial island pipe joint connecting section, and a pushing trolley locating section is arranged at the rear part of the artificial island pushing section; the middle parts of two side walls of the artificial island pipe joint connecting box are respectively provided with a bracket, and the two brackets are respectively provided with a pushing trolley track;

the relay artificial island is also provided with a pipe joint supply system, the pipe joint supply system comprises a pipe joint horizontal steering section and a transportation slope way, and the pipe joint horizontal steering section is positioned between the artificial island traction anchorage section and the artificial island pushing section; the transportation slope way is perpendicular to the axis of the tunnel, the lower port of the transportation slope way is communicated with the pipe joint horizontal steering section, and the upper port of the transportation slope way is positioned on the ground of the relay artificial island.

In the cable-stayed anchorage type suspended tunnel structure for relay extension of the artificial island, the number of the group of island wall cable pipelines and the number of the group of cable steering piers are the same as the number of the group of stay cables; a guy cable protective sleeve is also arranged in the inner cavity of each island wall guy cable pipeline;

the bottom of the outer end of each island wall guy cable pipeline is higher than the elevation of the underwater suspended tunnel and not higher than the minimum bottom elevation of the channel;

the bottom of each guy cable steering pier is higher than the elevation of the underwater suspended tunnel and not higher than the bottom elevation of the channel; the inner parts of the group of guy cable steering piers are respectively provided with a guy cable channel along the axial direction of the group of island wall stay cable pipelines in a one-to-one correspondence manner, and a steering cable guide device is pre-embedded in each guy cable channel;

the upper part of a stay cable anchorage pier of the stay cable receiving room is provided with a stay cable anchorage monitoring room, and a stay cable stress monitoring system is arranged in the stay cable anchorage monitoring room;

a group of cable guides are arranged on one side, facing the suspension tunnel, of the cable anchorage pier, the number of the group of cable guides is the same as that of the group of stay cables, a group of cable force monitoring grooves are formed behind the group of cable guides in a one-to-one correspondence mode, a cable force monitor is arranged in each cable force monitoring groove, front anchorage blocks and rear anchorage blocks are arranged at the front end and the rear end of each cable force monitoring groove in a one-to-one correspondence mode, and an electric anchor machine is arranged behind each rear anchorage block;

the cable-stayed anchorage type suspension tunnel structure for relay extension of the artificial island is characterized in that an open-cut cast-in-place tunnel and a mine tunneling method tunnel are sequentially arranged below the ground in the pushing side land slope tunnel and the receiving side land slope tunnel; the open-cut cast-in-place tunnel is provided with an open section, a grating section and a buried section from the ground downwards in sequence.

The cable-stayed anchorage type suspended tunnel structure with relay extension of the artificial island is characterized in that the island foundation is constructed by backfilling sand in a cofferdam formed by submerging an ultra-large concrete buoyancy tank; the cylindrical island wall is formed by a steel cylindrical lattice body and a dense filler inside the steel cylindrical lattice body, and the island inner body is constructed by back-filled sand.

The cable-stayed anchorage type suspension tunnel structure for relay extension of the artificial island has the following characteristics:

1) the invention adopts the artificial island to carry out relay extension on the underwater suspended tunnel, greatly improves the length of the tunnel, and effectively solves the problems of ventilation, escape and the like of the super-long tunnel.

2) The underwater suspension tunnel is simple in structure, linear, the total length of the suspension tunnel is shortest, and the cost is lower than that of a curve type.

3) The underwater suspension tunnel structure is completely positioned underwater, and the water surface ship passing cannot be influenced.

4) The total height of the underwater suspension tunnel structure is only the height difference between the height of the cable steering position in the middle of the cable steering pier and the height of the bottom surface of the pipe joint, and the underwater space occupied by the stay cable is smaller than that of a floating type, an anchoring type and a pier stud type which are proposed internationally so far, so that the influence range on the underwater vehicle is reduced.

5) The invention adopts the artificial island to carry out relay extension on the underwater suspension tunnel, so that the ultra-long suspension tunnel can be constructed at multiple points simultaneously, and the construction period is greatly saved.

6) Compared with an anchoring type suspension tunnel, the underwater guy cable anchorage structure disclosed by the invention adopts an artificial island type, so that the number of the anchorage structures is greatly reduced, and the cost is correspondingly low.

7) Compared with a floating type suspension tunnel, the underwater suspension tunnel is not affected by tide rising and tide falling, and is more reasonable and clear in stress.

8) The stay cable is led to the ground, can be used for positioning when the underwater suspension tunnel is installed, is convenient to operate in land, and provides a convenient limiting device and a convenient limiting method for installation of the suspension tunnel pipe body.

9) The stay cable can be used for cable force monitoring and cable maintenance and replacement in the tunnel operation period, and the anchoring systems of other forms of suspension tunnels are positioned at the water bottom, so that the maintenance and the replacement are extremely difficult.

10) The stay cable provides upward tension for the underwater suspension tunnel, so that the underwater suspension tunnel can never sink, and the safety risk of the tunnel in the operation period is greatly reduced.

Drawings

FIG. 1 is a plan view of a cable-stayed anchor type suspended tunnel structure for relay extension of an artificial island of the invention;

FIG. 2 is a longitudinal section of a cable-stayed anchor type suspended tunnel structure of the artificial island relay extension of the present invention;

FIG. 3 is a cross-sectional view of the suspended tunnel structure of the present invention employing two-way double rope surfaces;

fig. 4 is a longitudinal section of a pushing side bank structure in the suspension tunnel structure of the present invention;

FIG. 5 is a cross-sectional view of a thrust segment of the jacking side shoring structure in the suspended tunnel structure of the present invention;

FIG. 6 is a cross-sectional view of the jacking section of the jacking side shoring structure in the suspended tunnel structure of the present invention;

fig. 7 is a longitudinal sectional view of a receiving side bank structure in the suspension tunnel structure of the present invention;

FIG. 8 is a longitudinal cross-sectional view of a pipe joint connection in the suspension tunnel structure of the present invention;

FIG. 9 is a cross-sectional view of a coupling of pipe sections in the suspended tunnel structure of the present invention;

FIG. 10 is a cross-sectional view of the last section of pipe joint in the suspension tunnel structure of the present invention fixedly connected to the push side shoring structure;

FIG. 11 is a longitudinal sectional view of the last section of pipe joint in the suspension tunnel structure of the present invention fixedly connected to the push side shoring structure;

FIG. 12 is a plan view of an artificial island pipe joint connection system in a suspended tunnel structure of the present invention;

fig. 13 is a longitudinal cross-sectional view of an artificial island receiving side land structure in the artificial island pipe joint connection system of the present invention;

fig. 14 is a longitudinal sectional view of an artificial island thrusting side shoring structure in the artificial island pipe joint connecting system of the invention;

FIG. 15 is a longitudinal cross-sectional view of the connection structure of the artificial island pipe joint connection system of the invention during tunnel construction;

fig. 16 is a schematic structural diagram of a guy cable anchorage system of a diagonal suspension tunnel for relay extension of an artificial island according to the present invention;

fig. 17 is an elevation view of a guy anchor artificial island in the guy anchor system of the present invention;

fig. 18 is a plan view of a cylindrical island wall of a cable anchor artificial island in the cable anchor system of the present invention;

FIG. 19 is a schematic structural view of a cable diverter pier in the cable tie system of the present invention;

fig. 20 is a schematic structural view of a cable anchor pier in the cable anchor system of the present invention;

fig. 21 is a state diagram of the suspension tunnel structure of the present invention using the incremental launching construction process.

Detailed Description

The invention will be further explained with reference to the drawings.

Referring to fig. 1 to 20, the cable-stayed anchor type suspended tunnel structure with relay extension of the artificial island comprises a tunnel body, a shore-connecting structure, a plurality of seat-tension artificial islands 7, a cable anchor system, a buoyancy ratio adjusting system, an anti-collision warning system, an escape system and tunnel auxiliary facilities. The shore connecting structure comprises a pushing side shore structure 2 and a receiving side shore structure which are correspondingly arranged on a pushing side shore and a receiving side shore one by one; the tunnel body comprises an underwater suspension tunnel 1, a pushing side land slope tunnel 6 and a receiving side land slope tunnel; the water facing end of the pushing side land area slope tunnel 6 and the water facing end of the receiving side land area slope tunnel are connected with the back water end of the pushing side bank structure 2 and the back water end of the receiving side bank structure in a one-to-one correspondence mode. The pushing side land area slope tunnel 6 and the receiving side land area slope tunnel are sequentially provided with an open-cut cast-in-place tunnel and a mining method tunneling tunnel from the ground downwards; the open-cut cast-in-place tunnel is provided with an open section, a grating section and a buried section from the ground downwards in sequence. The underwater suspension tunnel 1 is formed by connecting a plurality of sections of pipe joints 10, each section of pipe joint 10 is divided into a tunnel upper layer 10A, a tunnel middle layer 10B and a tunnel lower layer 10C by an upper partition plate 10 and a lower partition plate 1B, and the space of the tunnel upper layer 10A is a process chamber; the tunnel middle layer 10B is a tunnel traffic room; the tunnel lower layer 10C is a water supply and drainage chamber.

The jacking side shore structure 2 sequentially comprises from sea area to land area: the underwater embankment section 21, the starting section 22, the cave entrance section retaining wall 2A, the cave entrance section 23, the waterside wall 2B, the thrust section 24, the sealing section 25, the butt joint section 26, the pushing section 27, the horizontal transportation section 28 and the backwater side wall 2C; wherein the content of the first and second substances,

the underwater bank protection section 21 is positioned on an underwater side slope on the waterside side of the pushing side bank structure 2, and stone throwing protection is carried out on the slope surface to prevent scouring; the protection length of the slope is designed according to the whole arc sliding surface from the backwater side wall body 2C to the underwater bank protection section 21.

The starting section 22 is a horizontal section between a cave entrance section retaining wall 2A and a slope top line of the underwater bank protection section 21, the design elevation of the starting section 22 is the design bottom elevation of the section of the underwater suspension tunnel 1, and a placing surface of two banks of the underwater suspension tunnel 1 is formed, so that conditions are created for achieving the purpose that the underwater suspension tunnel 1 never sinks; the tunnel foundation bed of the starting section 22 is formed by excavating local bank slopes, and the top surface of the foundation bed is composed of a broken stone cushion layer and block stones; a high-pressure water gun is arranged on the top surface of the foundation bed to prevent the foundation bed from bulging due to siltation; in order to ensure that the bank slopes on the two sides of the tunnel outside the wall are stable, the top of the tunnel of the starting section 22 is backfilled with rock blocks 220. When the length of the starting section 22 is designed, firstly, the requirement of the integral arc sliding stability of the underwater side slope outside the bank-connecting structure must be met, and in addition, the width of the slope top outside the wall of the bank-connecting structure must meet the width requirement of the building enclosure construction, so the length of the starting section 22 is 10 m-12 m;

the protective guide walls on the two sides of the tunnel outside the wall of the starting section 22 are designed and calculated according to the cantilever structure; the wide range of the bank slope top can adopt a ground-linked wall structure, and the outer side of the bank slope top is protected by adopting steel pipe lock catch piles;

the opening section 23 is arranged between the opening section retaining wall 2A and the waterside wall 2B, the diameter of the opening section 23 is the outer diameter of the pipe joint plus the diameter of the 2 × stay cable plus the allowance clearance, and the allowance clearance is 6-10 cm.

The opening section 23 of the jacking side shore structure 2 is also provided with a temporary sealing door 231 and a corresponding water stopping device on the front side surface of the waterside wall body 2B, the temporary sealing door 231 is provided with a water stopping plug, and the temporary sealing door 231 is fastened by utilizing the deep water pressure outside the waterside wall body 2B; when pushing, the water blocking plug is opened to balance the internal and external water pressure, so that the temporary sealing door 231 can be easily pushed open; the temporary sealing door 231 is a steel sealing door and has the diameter of the hole diameter plus 100 cm;

the thrust section 24 is positioned at the rear side of the water-facing side wall body 2B and has a sealed box chamber structure, and the length of the thrust section 24 is 60-80 m; the top of the thrust section 24 is provided with a manhole 240 and an embedded cover plate for maintenance; an anchor ear type thrust device 241 is arranged in the thrust section 24, and thrust is performed by utilizing the friction force between the anchor ear type thrust device 241 and the pipe joint 10;

the sealing section 25 is positioned at the rear side of the thrust section 24 and is used for temporarily stopping water when the pipe joint 10 is pushed to perform dry-wet environment conversion, in order to obtain better sealing effect and bear larger deepwater pressure, the sealing section 25 is a sealing wall body provided with a wall hole, after the pipe joint 10 at the front section is pushed, the tail end of the pipe joint is left in the sealing wall body and is used for butt joint of the subsequent pipe joint 10, sealing hoops are respectively arranged on the front side surface and the rear side surface of the sealing wall body 25 along the circumference of the wall hole, and a water stopping strip is arranged between the wall hole and the outer surface of the pipe joint 10;

the butt joint section 26 is located at the rear side of the sealing section 25, namely, a position left exposed at the rear side of the sealing wall body for butt joint with a subsequent pipe joint after the pipe joint 10 is pushed forward is left, and the length of the butt joint section 26 is the length of the left exposed pipe joint 10; the length of the butt joint section 26 is 100 cm-120 cm, and the bottom of the butt joint section 26 is provided with a stepped pipe joint butt joint pit 260 for a personnel standing position. The width of the pipe joint butt pit 260 is 1m, and the depth is 1.5 m;

because the pipe joint 10 of the underwater suspension tunnel 1 is constructed in a dry environment, in order to form the dry environment, the butt joint section 26 and the pushing section 27 are both arranged in the pipe joint connecting box 2D which can be opened and closed, so the pipe joint connecting box 2D can be designed into a rectangular water tank type with a top cover, pedestrian channels with the width of 60 cm-100 cm are reserved on two sides of the pipe joint 10 of the pipe joint connecting box 2D, and the clear height of 100 cm-120 cm is reserved at the bottom; powerful water pumping equipment is arranged in the pipe joint connecting box 2D, and after the pipe joint 10 is pushed and pushed, water is pumped in the pipe joint connecting box 2D after thrust and sealing, so that a dry environment is formed. In order to facilitate the butt joint and tensioning of the pipe joint 10, a pull ring is arranged on the wall body of the butt joint section 26 of the pipe joint connecting box 2D, or an anchor machine is arranged at the rear end of the pushing section 27;

the pushing section 27 is positioned at the rear side of the butt joint section 26 and is used for connecting, tensioning and pushing the pipe joint 10; the bottom of the pushing section 27 is provided with a carrying air bag; in order to facilitate the pushing of the pipe joint 10, the rear part of the pushing section 27 is provided with a pushing trolley locating section, the middles of two side walls of the pipe joint connecting box 2D are respectively provided with a bracket 271, two brackets 271 are respectively provided with a pushing trolley track 272 for the pushing trolley 270 to move forward, and the pipe joint butting positions on the two brackets 271 of the pipe joint connecting box 2D are provided with thrust blocks for limiting the pushing trolley 270; the length of the pushing section 27 is the sum of the length of each section of pipe joint 10 and the length of the pushing trolley locating section;

the length of the horizontal transportation section 28 is not less than the length of each section of pipe section 10; the horizontal transportation section 28 is used for ramp conversion, pipe joint unloading and secondary fitting-out of the tunnel pipe joint 10 transported from the pushing side land area slope tunnel 6 to the pushing side shore structure 2, and can be used as a station platform and a meeting transit area in the suspension tunnel operation period; to facilitate secondary outfitting of the tunnel pipe section 10; the transport platform for the pipe sections 10 can be driven directly to the horizontal transport section 28; a jacking beam driven by a jack is arranged at the bottom of the horizontal transportation section 28, and after the jacking beam jacks up, the transportation flat car is withdrawn for secondary outfitting; after the second outfitting is completed, a carrying air bag penetrates between the lower part of the pipe joint 10 and the jacking beam, and the pipe joint 10 is moved to the jacking section 27 for butt joint after the carrying air bag is inflated.

The receiving side bank structure comprises from sea area to land area in sequence: the underwater revetment section 21, the receiving section 22 ', the opening section retaining wall 2A, the opening section 23, the waterside side wall 2B, the pipe joint stabilizing section 24', the sealing section 25, the pipe joint solidifying section 26 ', the traction anchorage section 27' and the backwater side wall 2C; wherein the content of the first and second substances,

the underwater revetment section 21, the receiving section 22', the cave mouth section retaining wall 2A, the cave mouth section 23, the waterside wall 2B, the sealing section 25 and the backwater side wall 2C of the receiving side revetment structure have the same structures as the underwater revetment section 21, the starting section 22, the cave mouth section retaining wall 2A, the cave mouth section 23, the waterside wall 2B, the sealing section 25 and the backwater side wall 2C in the pushing side revetment structure 2 in a one-to-one correspondence manner; the pipe joint stabilizing section 24 ', the pipe joint fixing section 26 ' and the traction anchoring section 27 ' correspond to the thrust section 24, the pushing section 27 and the horizontal transportation section 28 in the pushing side shore structure 2 one by one, and the longitudinal length can be reduced.

A wall hole is formed in a water-facing side wall body 2B of the receiving side shore structure and used for jacking a pipe joint 10, a water stopping device 232 is arranged on the upstream face of the water-facing side wall body 2B along the wall hole, the water stopping device 232 adopts a sealing hoop, and a rubber water stopping strip is arranged on the sealing hoop;

the pipe joint stabilizing section 24 'is located behind the waterside wall body 2B and is of a reinforced concrete box structure, a manhole is formed in the top of the pipe joint stabilizing section, an embedded cover plate is arranged on the manhole, and a hoop type pipe joint stabilizing device is arranged in the pipe joint stabilizing section 24' and used for stably controlling the posture of the pipe joint 10 after pushing the pipe joint.

The sealing section 25 is positioned behind the pipe joint stabilizing section 24', the sealing section 25 is a sealing wall provided with a wall hole, a water stopping device 232 is also arranged on the upstream surface of the sealing wall along the wall hole, the water stopping device 232 adopts a sealing hoop, and a rubber water stopping strip is arranged on the sealing hoop;

the pipe joint fixing section 26 ' is positioned at the rear side of the sealing section 25, and is provided with a pipe joint anchoring box which can be opened and closed, the structure of the pipe joint anchoring box is the same as that of the pipe joint stabilizing section 24 ', the pipe joint anchoring box is also a reinforced concrete box body structure, the tail part of the pipe joint anchoring box is provided with a steel sealing door 26A, and the steel sealing door and the pipe joint fixing section 26 ' form a sealed cabin structure to prevent seawater from flowing backwards; after the pipe joint 10 is pushed to enter the pipe joint consolidation section 26 ', the water stopping device 232 on the water-facing side wall body 2B and the water stopping device 232 on the sealing section 25 are opened, then the pipe joint consolidation section 26 ' is pumped to form a dry construction environment, and concrete on the outer surface of the head part of the pipe joint 10 in the pipe joint consolidation section 26 ' is poured to form consolidation with a receiving side shore structure.

The traction anchorage section 27 ' is positioned between the steel sealing door 26A of the pipe joint consolidation section 26 ' and the backwater side wall body 2C, a reinforced concrete abutment is arranged at the bottom of the traction anchorage section 27 ', a pile foundation is arranged below the abutment, and a traction device 27A of a high-power traction cable 8 is arranged on the abutment; and (3) after the pipe joints are pushed to the proper position and are solidified, detaching the abutment and the traction device 27A, and then communicating the head of the first section of pipe joint with the receiving side land area slope tunnel 6' by cast-in-place reinforced concrete.

The pushing side shore structure and the receiving side shore structure can be used as a transit station in the suspension tunnel operation period, can also be used as an initial well for land slope tunnel construction, can adjust the floating weight ratio of the suspension tunnel in the construction period and the operation period, and have wide application. The top pushes away side bank structure and receives the side bank structure and is underground reinforced concrete structure, establishes the pile foundation under the basis to increase perpendicular and horizontal bearing capacity. According to geological conditions, the construction of the pushing side shore structure and the receiving side shore structure can adopt a ground connection wall reverse construction method, an open caisson method or a freezing method; and constructing the tunnel portal sections of the pushing side shore structure and the receiving side shore structure by adopting a cofferdam method.

The multiple sections of pipe joints 10 of the underwater suspension tunnel 1 are connected with joint water stopping materials through pipe joint joints, joint fasteners and joint filling materials; wherein the content of the first and second substances,

the pipe joint is a socket joint, and a plurality of countersunk joint bolt holes are respectively uniformly distributed and correspondingly and radially formed in the outer surface of the bell mouth and the inner surface of the spigot of each section of pipe joint 10;

the joint fastener comprises a joint inner fastener and a joint outer fastener; the joint inner fastener is a high-strength stainless steel bolt 11, a nut and a gasket which are inserted in the joint bolt hole and adopts a vertical anchoring type; the external joint fastener comprises a plurality of anchorage seats 12 which are arranged on the inner surface of each section of pipe joint 10 and are close to the pipe orifice, and steel strands or prestressed steel bars 13 which are connected between the anchorage seats 12 of the two sections of butted pipe joints through anchorage devices;

the joint filling materials comprise joint gap filling materials 14 filled between the inner surface of the bell mouth and the outer surface of the spigot of the two butted pipe joints 10 and bolt hole filling materials (not shown) filled in the joint bolt holes of the two butted pipe joints 10;

the joint water stop material comprises an outer water stop ring 15 arranged between the end surface of the socket of the two butted pipe joints 10 and the stop cover of the socket and an inner water stop ring 16 arranged between the end surface of the socket and the stop cover of the socket.

The tail part of the last section of pipe joint 10 ' and the head part of the first section of pipe joint are positioned in the pushing side shore structure 2 and the receiving side shore structure in a one-to-one correspondence manner, and the outer surface of the tail part of the last section of pipe joint 10 ' and the inner surface of a pipe joint connecting box 2D in the pushing side shore structure 2 are consolidated through pouring concrete 20 '; the head outer surface of the first section pipe section is consolidated by pouring concrete between the inner surfaces of the pipe section consolidation sections 26' in the side land structure.

The vertical anchoring of the fastening bolt in the joint adopted by the invention is firmer than the screw thread anchoring of the horizontal bolt; the joint external fastening piece, namely an external prestress structure, is adopted, so that the joint external fastening piece not only can be used for tensioning during butt joint of pipe joints, but also can participate in bearing horizontal tension in the operation period of the tunnel; the underwater pushing device can meet the requirements of underwater pushing installation processes of pipe joints of underwater suspension tunnels and can meet the requirements of stress and durability of tunnel structures.

The plurality of the artificial islands 7 are arranged at intervals along the axial direction of the underwater suspension tunnel 1, and two ends of each artificial island 7 are respectively fixedly connected with the underwater suspension tunnel 1, so that the whole underwater suspension tunnel 1 is divided into a plurality of cross-suspension tunnels; each inclined stay cable anchorage artificial island 7 comprises an island foundation and a vertical island body consisting of a cylindrical island wall and an island inner body; in view of the construction difficulty, the relay artificial island 7 is preferably arranged in a sea area with the water depth of 40-100 m. The plane of each binding force artificial island 7 is in a round or oval shape with a gap and is divided into an island inner part and an island outer part; the external part of the island comprises a material wharf 71, a breakwater 72 and a harbor basin 73, and the gap is a port door of the harbor basin 73. The island interior is provided with an artificial island pipe joint connecting system and an artificial island pipe joint supply system.

The artificial island pipe joint connecting system provided by the invention has the functions of pipe joint receiving and pipe joint pushing, is arranged underground of the relay artificial island 7 and comprises an artificial island receiving side shore structure 7A arranged opposite to a pushing side shore and an artificial island pushing side shore structure 7B arranged opposite to the receiving side shore.

The artificial island receiving side shore structure 7A has functions of pushing, pulling and receiving the pipe joint 10 and comprises an artificial island receiving section 71a, an artificial island receiving side island wall section 72a, an artificial island receiving side thrust section 73a, an artificial island anchoring connection section 74a and an artificial island pulling anchor section 75a which are sequentially arranged from the sea area to the inside of the island. The artificial island receiving side anti-thrust section 73a is positioned in a sealed box chamber between a receiving side anti-thrust front sealed wall 731 and a receiving side anti-thrust rear sealed wall 732 which are respectively provided with wall holes, and the hoop type anti-thrust device 730 is arranged in the sealed box chamber and is used for anti-thrust by utilizing the friction force between the hoop type anti-thrust device 730 and the pipe joint 10; a water stopping device 735 is arranged on the receiving-side thrust front sealing wall 731 and the receiving-side thrust rear sealing wall 732 along the circumference of the wall hole respectively, and the water stopping device 735 is a sealing hoop.

The structures of the artificial island receiving side island wall section 72a, the artificial island receiving side thrust section 73a, the artificial island anchoring connection section 74a and the artificial island traction anchorage section 75a in the artificial island receiving side shore structure 7A are the same as the structures of the opening section 21, the pipe joint stabilizing section 24 ', the sealing section 25, the pipe joint consolidation section 26 ' and the traction anchorage section 27 ' in the receiving side shore structure in a one-to-one correspondence manner, and the roles played by the sections are also the same; the artificial island anchoring connection section 74a is provided with an artificial island pipe joint anchoring box 76 which can be opened and closed, and a high-power water pumping device is arranged in the artificial island pipe joint anchoring box 76.

The artificial island pushing side shore structure 7B has functions of dry abutting and wet pushing of pipe joints and comprises an artificial island pushing section 75B, an artificial island pipe joint connecting section 74B, an artificial island pushing side thrust section 73B, an artificial island pushing side island wall section 72B and an artificial island starting section 71B which are sequentially arranged from the inside of the island to the sea area. The artificial island pushing side anti-thrust section 73b is positioned in a sealed box chamber between a pushing side anti-thrust front sealed wall 733 and a pushing side anti-thrust rear sealed wall 734 which are respectively provided with wall holes, an anchor ear type anti-thrust device 730 is arranged in the sealed box chamber, and the anti-thrust is realized by utilizing the friction force between the anchor ear type anti-thrust device 730 and the pipe joint 10; a water stopping device 735 is arranged on each of the pushing side thrust front sealing wall 733 and the pushing side thrust rear sealing wall 734 along one circle of the wall hole, the water stopping device 735 is a sealing hoop, and a water stopping strip is arranged between the wall hole and the outer surface of the pipe joint 10. The bottom of the artificial island pipe joint connecting section 74b is provided with a stepped pipe joint docking pit 740 for an operator to stand, and the width of the pipe joint docking pit 740 is 1m, and the depth is 1.5 m.

The structures of an artificial island pushing section 75b, an artificial island pipe joint connecting section 74b, an artificial island pushing side thrust section 73b and an artificial island pushing side island wall section 72b in the artificial island pushing side shore structure are the same as the structures of the pushing section 27, the butt joint section 26, the sealing section 25, the thrust section 24 and the opening section 21 of the pushing side shore structure 2 in a one-to-one correspondence manner, and the roles played are also the same; the artificial island pipe joint connecting section 74b and the artificial island pushing section 75b are both arranged in an openable and closable pipe joint connecting box 77, and a high-power water pumping device is arranged in the artificial island pipe joint connecting box 77.

The outer surface of the head of the first section of pipe joint of the subsequent cross-suspension tunnel entering the relay artificial island 7 is consolidated with the inner surface of the artificial island anchoring connecting section 74 through pouring concrete; the tail outer surface of the last section of pipe joint which pushes the previous span suspension cableway left in the relay artificial island 7 and the inner surface of the pipe joint connecting section 74b from the artificial island pushing section 75b to the artificial island are consolidated through pouring concrete.

The artificial island pipe joint supply system comprises a pipe joint horizontal steering section 74 and a slope way 75; wherein, the pipe joint horizontal steering section 74 is positioned between the artificial island pulling anchorage section 75a and the artificial island pushing section 75 b; the slope way 75 is arranged perpendicular to the axis of the tunnel, the lower port of the slope way is communicated with the pipe joint horizontal steering section 74, and the upper port of the slope way is positioned on the ground of the relay artificial island 7.

The relay artificial island is independently arranged in water, plays a role in receiving and launching each span of the suspension tunnel in the construction period of the suspension tunnel in the water, and enables the suspension tunnel in the water to continuously extend in the sea through the relay artificial island. The functions of ventilation, escape, service area and the like are realized in the operation period of the tunnel. The connection type of the underwater suspension tunnel and the relay artificial island is rigid connection. The 'shore connection structure' in the island is an underground reinforced concrete structure, and a pile foundation is arranged below the foundation so as to increase the vertical and horizontal bearing capacity. The artificial island receiving side bank structure and the artificial island receiving side bank structure in the relay artificial island both adopt an in-island cast-in-place process, and construction is carried out after foundation treatment in the island.

The cable anchorage system adopts a bidirectional single cable surface or a bidirectional double cable surface and comprises a plurality of pairs of cable anchorage artificial islands 4 and a plurality of groups of stay cables; and a plurality of pairs of guy cable anchorage artificial islands 4 are arranged at the midspan positions at two sides of each midspan suspended tunnel. Each group of stay cables is arranged between each span of the suspension tunnel and each pair of guy cable anchorage artificial islands 4; each group of stay cables comprises a plurality of stay cables 3.

The plane of the guy cable anchorage artificial island 4 is in an oval arrangement and is arranged along the water flow direction, so that the influence of the water flow on the structural stability of the artificial island is reduced. In view of the construction difficulty of the deep sea artificial island, each guy cable anchorage artificial island 4 comprises an island base 4a at the lower part and a vertical island body at the upper part, and the vertical surface is in an inverted T shape; the island foundations 4a are constructed in a layered mode, and each layer is constructed by filling sand stones in a cofferdam formed by submerging the ultra-large concrete buoyancy tanks; the peripheral dimensions of each layer are as follows 1: 1-1: 1.5, the gradient is gradually reduced upwards, so that the shape of the island base 4a is pyramid; the vertical island body is composed of a cylindrical island wall 4b and an island inner body 4 c; the cylindrical island wall 4b is a cylindrical lattice body formed by connecting a steel large cylindrical main lattice 41b and a lattice type steel plate pile auxiliary lattice 42b and dense fillers filled in the cylindrical lattice body, and the fillers are backfill sand; the island inner body 4c is backfilled sand filled in the cylindrical island wall 4b, and the filling top elevation should meet the requirement of stability of the cylindrical island wall 4 b.

Each guy cable anchorage artificial island 4 is provided with a group of island wall guy cable pipelines 5b, a group of guy cable steering piers 5, a guy cable receiving room 4A, a guy cable ramp 50 and a power station 46; wherein the content of the first and second substances,

the number of the group of island wall stay cable pipelines 5b is the same as that of the group of stay cables 3; a group of island wall stay cable pipelines 5b are pre-embedded on a cylindrical island wall 4b of the cable anchorage artificial island 4, and the axes of the group of island wall stay cable pipelines 5b are consistent with the axes of a plurality of stay cables 3 anchored on the outer surface of one side of the suspension tunnel in a one-to-one correspondence manner; the bottom of the outer end of each island wall guy cable pipeline 5b is higher than the elevation of the underwater suspended tunnel and not higher than the minimum bottom elevation of the channel; each island wall guy cable pipeline 5b is composed of a steel sleeve embedded in the cylindrical island wall 4b and a guy cable protective sleeve arranged in the steel sleeve, and the guy cable protective sleeve adopts an anti-corrosion sleeve, such as a reinforced plastic pipe; the island wall guy cable pipeline 5b is arranged to enable the stay cable 3 to penetrate through the cylindrical island wall 4 b;

the number of the group of stay cable steering piers 5 is the same as that of the group of stay cables 3; a group of guy cable steering piers 5 and a group of island wall guy cable pipelines 5b are correspondingly arranged in the guy cable anchorage artificial island 4 and close to the inner wall of the cylindrical island wall 4b one by one, and the bottom of each guy cable steering pier 5 is higher than the elevation of the underwater suspended tunnel and not higher than the minimum bottom elevation of the navigation channel; a group of stay cable steering piers 5 are internally provided with a stay cable channel respectively in a one-to-one correspondence along the axial direction of a group of island wall stay cable pipelines 5b, and a steering cable guider 51 is pre-embedded in each stay cable channel; each guy cable steering pier 5 is a reinforced concrete pier structure with a pile foundation at the lower part so as to increase the pulling resistance;

a stay cable receiving room 4A is arranged on the ground higher than the water surface in the island inner body 4c of the stay cable anchorage artificial island 4, a stay cable anchorage pier 40 is arranged at the lower part of the stay cable receiving room 4A, a stay cable anchorage monitoring room 4B is arranged at the upper part of the stay cable receiving room 4A, and a stay cable stress monitoring system 45 is arranged in the stay cable anchorage monitoring room 4B;

the guy cable anchorage pier 40 is a reinforced concrete pier structure with a pile foundation at the lower part so as to increase the pulling resistance; a group of cable guides 41 are arranged on one side of the cable anchorage pier 40 facing the suspension tunnel, the number of the group of cable guides is the same as that of the group of stay cables 3, so as to accommodate all the stay cables 3 on one side of each span of the suspension tunnel and change all the stay cables 3 on one side of each span of the suspension tunnel into the horizontal direction; a group of cable force monitoring grooves are formed in the rear of the group of cable guides 41 in a one-to-one correspondence manner, a cable force monitor 42 is arranged in each cable force monitoring groove, front and rear anchor blocks 43 and 43 'are arranged at the front and rear ends of each cable force monitoring groove in a one-to-one correspondence manner, and an electric anchor machine 44 is arranged behind each rear anchor block 43'; the front anchorage block 43 and the rear anchorage block 43' are both used for anchoring the stay cable 3; the electric anchor gear 44 is used for tensioning the stay cable 3;

the cable ramp 50 is arranged between the group of cable steering piers 5 and the cable anchor pier 40; the structure of the inhaul cable ramp 50 is that a gravel cushion layer and a concrete surface layer are arranged from bottom to top in sequence;

the power station 46 is arranged beside the guy cable anchorage pier 40 and provides power sources for the electric anchor 44, the guy cable stress monitoring system 45 and the like;

one end of each inclined stay cable 3 is anchored on the stay cable anchors on the outer surfaces of the two sides of each span of the suspension tunnel at intervals; the other ends of the plurality of stay cables 3 correspondingly penetrate through a group of island wall cable pipelines 5b arranged on the pair of cable anchor artificial islands 4 one by one, enter island inner bodies 4c of the cable anchor artificial islands 4, change directions through steering cable guides 51 on the group of cable steering piers 5, then extend upwards to the ground along cable ramps 50, and are finally anchored on the cable anchor piers 40.

The function of the cable anchorage artificial island 4 is to extend the stay cable 3 from the water to above the water surface, thereby facilitating the construction, monitoring, maintenance and replacement of the stay cable 3.

The stay cable 3 is mainly used for resisting horizontal force such as water flow force, and meanwhile, in order to keep the underwater stability of the underwater suspension tunnel 1, the gravity of the underwater suspension tunnel 1 is slightly larger than buoyancy, and meanwhile, the dead weight of the underwater suspension tunnel 1 in the operation period is possibly increased, so that the stay cable 3 simultaneously bears vertical force generated by the weight of partial tunnel pipe joints, and the stay cable 3 has performance requirements of wear resistance, corrosion resistance, high tensile strength, convenience in replacement and the like, therefore, the stay cable 3 adopts an ultrahigh molecular weight polyethylene fiber cable, and the underwater floating weight ratio of the stay cable 3 is 1. Each stay cable 3 is independently provided with a stay cable steering pier 5, and the stay cable steering piers 5 are used for steering the stay cables 3 and reducing the elevation of the stay cables 3 in water, so that navigation is not influenced, and meanwhile, the tension of the stay cables 3 is reduced; the stay cable 3 passes through the lower part of a steering cable guider 51 in the stay cable steering pier 5 and then is guided to the water surface along the stay cable ramp 50 so as to facilitate the tensioning operation of the stay cable 3; the cable anchorage pier 40 is a receiving and anchoring structure of the stay cable 3, and has the functions of tension adjustment and monitoring of the stay cable 3. The guy anchor pier 40 is arranged in a water-free environment, so that the guy anchor pier is convenient to operate the tensioning of the stay cable 3 and is not influenced by conditions such as wind, wave and flow on site. And a cable force monitor 43 and an electric anchor machine 44 are arranged on the cable anchorage pier 40 and used for monitoring the cable force. The cable force monitoring and the replacement of the stay cable 3 in the operation period are carried out in a stay cable anchorage monitoring room 4B above the stay cable anchorage pier 40. The sloping surface of the cable ramp 50 is integral, namely, the range of all the stay cables 3 on each side of the suspended tunnel is included, and the stay cables 3 are prevented from being worn.

The invention relates to a guy cable anchorage system of a diagonal suspension tunnel with relay extension of an artificial island, which is mainly used for fixing a suspension tunnel 1 in water. The force is transmitted in a manner that the load borne by each span of the suspended tunnel is transmitted to the guy anchor pier 40 through the stay cable 3. The guy cable anchorage system needs to meet the requirements of the tunnel pipe joint underwater pushing installation process in the construction period of the suspension tunnel and the anchorage and stress monitoring requirements of the stay cable 3 in the service period of the suspension tunnel.

The floating weight ratio adjusting system is a guarantee system for keeping the floating depth and stability of the floating tunnel, and can ensure the gravity balance and the basically fixed floating depth of the underwater floating tunnel 1 during construction according to the fact that the floating weight ratio of the underwater floating tunnel 1 is similar to 1; during the operation period, the floating-weight ratio automatic adjusting system is used for balancing the change of the tunnel gravity caused by factors such as the generation of attachments in the sea. The floating weight ratio is an important control parameter of the underwater suspension tunnel, and the underwater inclined suspension tunnel is designed according to the buoyancy borne by the tunnel and according to the buoyancy smaller than the self gravity (namely the floating weight ratio is smaller than 1). The reference value of the floating weight ratio of the suspension tunnel is 0.75-0.95 under the condition of not calculating vehicle load and other using loads, the theoretical floating weight ratio needs to be selected according to the vibration amplitude and frequency of the tunnel caused by water flow and waves, and the selection is generally carried out according to the flow velocity of the water flow for intuition and convenience, wherein the smaller the flow velocity of the water flow, the larger the floating weight ratio is. The actual floating weight ratio of the tunnel is controlled by arranging a floating weight ratio adjusting device in each section of pipe joint of the underwater suspension tunnel so as to meet the requirements of stability in the construction period and comfort level in the operation period.

Anticollision warning system is able to warn the navigation thing on the surface of water including warning buoy system and warning anchor cable system under water, anticollision warning system, also can warn the ware of diving in the aquatic, can effectively reduce the risk that the suspension tunnel was strikeed.

The escape system consists of three parts: an automatic alarm system, an escape time prolonging system and a personnel escape system. The structure and facilities of the escape system are arranged in the underwater suspension tunnel, the pushing side shore structure, the receiving side shore structure and the relay artificial island. The escape system can effectively treat the water leakage of the common tunnel without evacuating people; and in the case that the tunnel is damaged to an excessive extent and people are required to evacuate, the evacuation time is greatly increased.

The invention relates to a diagonal-pulling anchorage type suspended tunnel with relay extension of an artificial island, which is an underwater suspended tunnel with the relay artificial island as a transition shore foundation, the guy cable anchorage artificial island as an anchorage body and the diagonal-pulling anchorage upwards.

The invention uses the relay artificial island as the transition shore base: firstly, relay extension is carried out on the underwater suspension tunnel; secondly, the requirements of ventilation and escape of the underwater suspended tunnel are met; thirdly, the problem that the installation of the long-span underwater suspension tunnel is difficult to control is solved; fourthly, the ultra-long underwater suspension tunnel can be constructed in a multi-span mode simultaneously, or relay and control are carried out during multi-span continuous construction; fifthly, the intermediate service area is needed to be established for the ultra-long road tunnel.

The relay artificial island is designed and arranged according to the stress characteristics of the construction period and the service period of the inclined-pulling type suspension tunnel and the overall construction process requirement of the suspension tunnel. The relay artificial island has to meet the requirements of bearing capacity, inclination resistance, skid resistance and overall stability. The cylindrical island wall structure is suitable for back filling sand. The original seabed should be treated with foundation and the backfill sand should be densified. The guy cable anchorage structure in the island is constructed after foundation treatment in the island. The construction of the guy cable steering pier, the guy cable ramp and the guy cable anchorage well structure can be cast in situ in the island.

The invention adopts the guy cable anchorage artificial island as the anchorage body, and aims at: firstly, the length of a single span of the underwater suspension tunnel is increased; secondly, the number of deepwater anchorage blocks is reduced, and the restriction of severe sea conditions on construction is reduced; thirdly, the underwater suspended tunnel anchorage system is converted from offshore construction to onshore construction, and construction progress and convenience are improved.

The artificial island for guy cable anchorage is independently arranged in the sea and is used for the guy cable anchorage of an underwater suspension tunnel. Depending on the depth of water, it is suitable for shallow depth of water, and must meet the requirements of bearing capacity, anti-tilt, anti-skid and overall stability.

The underwater suspended tunnel is anchored upwards in the guy cable anchoring artificial island on two sides of the tunnel by using the stay cables, mainly aiming at the fact that the water depth of the positions of the anchor points of the stay cables is relatively shallow and the construction is convenient; in addition, the stay cable provides upward pulling force for the underwater suspension tunnel, so that the underwater suspension tunnel never sinks, and the safety risk of the operation period of the underwater suspension tunnel is greatly reduced.

The stay cables on the underwater suspension tunnel are all arranged underwater and are not influenced by the fluctuation of the damp level. The ratio of buoyancy to gravity (ratio of buoyancy to gravity) of the tunnel in water is less than 1 and close to 1, so as to maintain the floating depth. The stay cables bear a small amount of tunnel gravity and mainly bear horizontal force action such as water flow force.

The buoyancy borne by the cable-stayed anchorage type suspension tunnel is designed according to the condition that the buoyancy is smaller than the self gravity (namely the buoyancy-weight ratio is smaller than 1). The floating weight ratio is an important control parameter of a suspended tunnel structure, the reference value of the floating weight ratio of the suspended tunnel is 0.75-0.95 without calculating vehicle load and other using loads, the theoretical floating weight ratio needs to be selected according to tunnel vibration amplitude and frequency caused by water flow and waves, selection is recommended according to the flow velocity of the water flow for intuition and convenience, and the larger the flow velocity of the water flow is, the larger the floating weight ratio is. The floating weight ratio adjusting device is arranged in each section of pipe joint of the underwater suspension tunnel to control the actual floating weight ratio of the tunnel so as to meet the requirements of stability in the construction period and comfort level in the operation period.

The cable-stayed anchorage type suspended tunnel for relay extension of the artificial island is linearly arranged in the plane direction and the longitudinal direction and comprises a land slope tunnel, a shore connection structure, an underwater suspended tunnel, a cable-stayed anchorage artificial island, a relay artificial island and the like. The underwater suspended tunnel is generally positioned at a deeper position under water, is connected with a shore connection structure at the shore side and is connected with a ground road through a land slope tunnel; the underwater suspended tunnel is connected with the relay artificial island in water so as to meet the design requirement of long distance of the tunnel. And a stable stress system is formed on a stay cable anchorage pier in the stay cable anchorage artificial island which is provided with the stay cable on the underwater suspension tunnel and is fixedly arranged at two sides of the underwater suspension tunnel.

According to the difference of the tunnel address ocean current directions and considering the safety risk of the tunnel operation period, the stay cable adopts a bidirectional single-cable-plane tunnel under the condition that the current of the sea ditch is bidirectional (rising and falling tide) and the flow rate is very low; under the condition that the current of the sea ditch is bidirectional current (rising and falling tide) and the flow velocity is large, a bidirectional double-cable-surface tunnel is adopted.

In order to reduce the influence of water flow force, two types are mainly considered for the cross section of the underwater suspension tunnel: round and prismatic (the included angle of the prismatic tip is less than or equal to 60 degrees), and a round section is recommended for saving cost. The transverse width of the tunnel is determined according to the number of lanes, and the cross section arrangement of the underwater suspension tunnel considers two types: single-tube cross section and double-tube cross section (a communication channel is arranged between the double tubes). In consideration of the safety of underwater operation period, the double-pipe section is recommended, and besides the self-arranged escape structure or facility, the communication channel can be used as an escape channel. The design of the distance between the double pipes needs to consider the influence of the shielding flow and the streaming around.

The shore connection structure is positioned on a stable foundation near a shore slope, and plays a role in connection and conversion between the underwater suspension tunnel and the onshore slope tunnel. In order to ensure the stability of the bank connecting structure and the bank slope, the original underwater slope on the waterside side of the bank connecting structure needs to be protected and reinforced. The connection type of the underwater suspension tunnel and the tunnel pipe section in the shore connection structure is rigid connection. Because the underwater suspension tunnel is buried deeply, the depth of the shore connection structure is required to be deep, the lower part of the underwater suspension tunnel is used for arranging a tunnel structure and a tunnel auxiliary facility application room, and the upper part of the underwater suspension tunnel can be used for parking lots and other purposes.

The tunnel of the invention is longitudinally arranged from shore to sea and mainly comprises a pipe section prefabricating factory, a land slope tunnel, a shore connecting structure, an underwater suspension tunnel, a relay artificial island and an underwater suspension tunnel … …. The land slope tunnel is connected with the ground road and positioned between the shore connection structure and the ground road, and can be used as a transportation channel of a tunnel pipe joint in the construction period. In order to facilitate multi-point operation on the sea, a pipe section prefabricating plant can be transversely arranged on the relay artificial island, prefabricated pipe sections can also be arranged to receive a dock, the pipe section prefabricating plant and a shipping dock are arranged on the nearby bank, and the prefabricated pipe sections are transported by adopting a semi-submersible barge.

The diagonal-pulling anchorage type suspension tunnel of artificial island relay extension of the invention recommends a pushing process, and the length of the tunnel pipe joint is more suitable from 60m to 80 m.

Referring to fig. 21, the construction method of the underwater suspension tunnel according to the present invention is performed according to a pushing process, and includes the following steps:

the method comprises the following steps: and constructing a pushing side shore structure 2, a receiving side shore structure, a relay artificial island 7 and a stay cable anchorage artificial island 4, and constructing open cut tunnels (open sections and transition sections) at the top of the land slope tunnel.

Step two: and constructing a buried section and a pipe joint prefabricating factory 9 of the land slope tunnel, and simultaneously constructing an artificial island receiving side shore structure 7A, an artificial island pushing side shore structure 7B and a cable anchor pier 40 in the cable anchor artificial island 4 in the relay artificial island 7.

Step three: and (3) prefabricating pipe joints of the underwater suspension tunnel and installing fittings, and meanwhile, excavating and reinforcing side slopes by pushing the starting section 22 of the side shore structure 2, the receiving section 22' of the receiving side shore structure and the artificial island receiving section 71a and the artificial island starting section 71b on the relay artificial island 7.

Step four: and the prefabricated pipe joints are transported into the jacking side shore structure 2 through the jacking side land area slope tunnel 6.

Step five: and performing secondary fitting-out of the pipe joints (installing a pushing guide beam, a traction cable of a stay cable and the like) in the pushing side shore structure 2.

Step six: and a hoisting ship is adopted to pull the traction cable 8 to the relay artificial island 7 closest to the pushing side shore structure 2 and is connected to a traction device 750, and meanwhile, the first stay cable 3 of the suspension tunnel is pulled to the cable anchorage artificial island 4.

Step seven: and (3) performing pipe joint butt joint in the jacking side shore structure 2.

Step eight: and sealing the pipe joint butt joint section in the pushing side shore structure 2, and opening a waterside sealing door of the pushing side shore structure to push the pipe joint.

Step nine: and (3) performing temporary thrust fixation on the pipe joints in the pushing side shore structure 2, then opening a sealing door of the butt joint section, and simultaneously transporting the latter pipe joints to the pushing side shore structure 2 for secondary outfitting (threading stay cables, measuring and controlling instruments and the like).

Step ten: and butting the next section of pipe joint with the previous section of pipe joint in the jacking side shore structure 2.

Step eleven: the butt joint section in the pushing side shore structure 2 is sealed, and a later section of pipe joint is pushed.

Step twelve: and repeating the ninth step to the eleventh step until the last section of pipe joint of the last span of the suspension tunnel is pushed completely, so that the tail of the last section of pipe joint remains in the butt joint section 26 of the pushing side shore structure 2, and the head of the first section of pipe joint enters the artificial island anchoring connection section 74 of the relay artificial island 7 closest to the pushing side shore structure 2.

Step thirteen: pumping water in the pipe joint connecting box 20, removing the hydraulic pushing trolley 270, pouring concrete between the outer surface of the tail of the last section of pipe joint and the inner surface of the pipe joint connecting box 20 of the pushing side shore structure 2 to be fixedly connected in the pushing side shore structure 2, pumping water in the pipe joint anchoring box 76 of the artificial island of the relay artificial island 7, detaching the pushing guide beam and the traction cable 8, removing the abutment and the traction device 750 in the artificial island traction anchorage section 75a, and pouring concrete between the outer surface of the head of the first section of pipe joint and the inner surface of the pipe joint anchoring box 76 of the artificial island of the relay artificial island 7 to be fixedly connected in the relay artificial island 7;

fourteen steps: and (3) filling water into the water supply and drainage chambers of the pipe joints section by section to adjust the floating weight ratio, and then adjusting the cable force of the stay cables section by section.

Step fifteen: and constructing subsequent auxiliary facilities in the suspension tunnel.

The underwater suspension tunnel can be constructed simultaneously every span of the suspension tunnel, and the four to fifteen steps are referred to.

The above embodiments are provided only for illustrating the present invention and not for limiting the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and therefore all equivalent technical solutions should also fall within the scope of the present invention, and should be defined by the claims.