阅读说明：本技术 一种水中桥梁基础施工方法 (Construction method of underwater bridge foundation ) 是由 周斌 张忠 李春才 潘海鹏 牛红杰 韩磊 于 2021-09-25 设计创作，主要内容包括：本申请涉及一种水中桥梁基础施工方法,涉及桥梁施工的领域,其包括如下步骤,S1、搭设围堰；S2、设置竖向支撑；S3、设置横向支撑；S4、抽水；S5、浇注混凝土垫层；所述固定装置包括两个固定杆以及两个螺纹杆,两个固定杆分别与所述横向支撑的两端固定连接,两个所述螺纹杆分别与所述围堰壁面以及所述竖向支撑固定连接,所述固定杆以及所述螺纹杆均为水平设置,所述固定杆外套设滑移有螺纹套,所述螺纹套与所述螺纹杆螺纹连接,所述固定杆与所述螺纹套之间设置有卡接组件。本申请具有便于安装以及拆卸横向支撑的效果,提升资料重复利用的效率,同时大大提升桥梁施工的工作效率。(The application relates to a method for constructing a foundation of an underwater bridge, which relates to the field of bridge construction and comprises the following steps of S1, building a cofferdam; s2, arranging a vertical support; s3, arranging a transverse support; s4, pumping water; s5, pouring a concrete cushion; fixing device include two dead levers and two threaded rods, two dead levers respectively with the both ends fixed connection of horizontal support, two the threaded rod respectively with cofferdam wall and vertical braces fixed connection, the dead lever and the threaded rod is the level setting, the dead lever overcoat is established and is slided and is equipped with the thread bush, the thread bush with threaded rod threaded connection, the dead lever with be provided with the joint subassembly between the thread bush. This application has the effect of being convenient for the installation and dismantling horizontal support, promotes data reuse's efficiency, promotes the work efficiency of bridge construction simultaneously greatly.)

1. A construction method of an underwater bridge foundation is characterized by comprising the following steps: comprises the following steps of (a) carrying out,

s1, building a cofferdam (1), inserting and driving steel piles around the base of the bearing platform until the steel piles are folded to form the cofferdam (1), and arranging a reverse filter layer (2) at the water bottom in the cofferdam (1);

s2, arranging vertical supports (3), and arranging the vertical supports (3) in the cofferdam (1) in a plugging and beating mode;

s3, arranging a transverse support (4), and fixedly installing the transverse support (4) between the wall surface of the cofferdam (1) surrounded by the angle steel (19) piles and the vertical support (3) through a fixing device;

s4, pumping water outwards from the inside of the cofferdam (1) to a proper construction height, and repeating the work of installing the transverse support (4) in the S3 until the inverted filter layer (2) is exposed;

s5, pouring a concrete cushion (5), and pouring the concrete cushion (5) after pumping water to the inverted filter layer (2);

fixing device includes two dead levers (6) and two threaded rod (7), two dead levers (6) respectively with the both ends fixed connection of horizontal support (4), two threaded rod (7) respectively with cofferdam (1) wall and vertical braces (3) fixed connection, dead lever (6) and threaded rod (7) are the level setting, dead lever (6) overcoat is established and is slided threaded sleeve (8), threaded sleeve (8) with threaded rod (7) threaded connection, dead lever (6) with be provided with the joint subassembly between threaded sleeve (8).

2. The underwater bridge foundation construction method according to claim 1, characterized in that: the joint subassembly includes joint ring (9) and butt dish (10), joint ring (9) with thread bush (8) keep away from in the one end fixed connection of threaded rod (7), slip is established to joint ring (9) cover outside dead lever (6), butt dish (10) with dead lever (6) orientation the one end fixed connection of threaded rod (7), butt dish (10) with joint ring (9) butt.

3. The underwater bridge foundation construction method according to claim 2, characterized in that: threaded sleeve (8) outer wall fixedly connected with is a plurality of handles (11), handle (11) length direction is along perpendicular to the axis direction setting of threaded sleeve (8), and is a plurality of handle (11) for the central axis of threaded sleeve (8) sets up for the symmetry.

4. The underwater bridge foundation construction method according to claim 2, characterized in that: the cofferdam (1) wall and the equal fixedly connected with regulating block (12) of vertical braces (3), regulating block (12) are provided with the slide opening, regulating block (12) in slide opening internal slipping is provided with adjusting screw (13), adjusting screw (13) with threaded rod (7) fixed connection, regulating block (12) in slide opening part rotates and is connected with adjusting nut (14), adjusting nut (14) with adjusting screw (13) threaded connection, regulating block (12) are provided with and are used for the restriction adjusting screw (13) pivoted locating part.

5. The underwater bridge foundation construction method according to claim 4, characterized in that: the locating part sets up to stopper (15), adjusting screw (13) outer wall is provided with spacing groove (16) along its length direction, stopper (15) sliding connection in spacing groove (16), the both ends of spacing groove (16) are closed setting.

6. The underwater bridge foundation construction method according to claim 5, characterized in that: adjusting nut (14) fixedly connected with turning block (17), adjusting block (12) in rotation groove (18) have been seted up to the slide opening part, turning block (17) set up to the L form, the cross-section that rotates groove (18) inner wall sets up to the T style of calligraphy, the vertical section of turning block (17) with adjusting nut (14) fixed connection, the horizontal segment of turning block (17) is in rotate the position rotation that groove (18) opening is big, the terminal surface of turning block (17) horizontal segment is the arc setting.

7. The underwater bridge foundation construction method according to claim 1, characterized in that: when water is pumped in the cofferdam (1) in the S4, sealing devices are arranged at four corners of the cofferdam (1), each sealing device comprises angle steel (19) which is sequentially arranged in the vertical direction, a plurality of supporting rods (20) are fixedly connected to the two sides of the corner of the cofferdam (1), each angle steel (19) is provided with a supporting hole (21) through which the corresponding supporting rod (20) penetrates, and each supporting rod (20) is provided with a locking piece used for clamping the corresponding angle steel (19).

8. The underwater bridge foundation construction method of claim 7, wherein: the locking piece sets up to locking dish (22), locking dish (22) are provided with the locking hole, bracing piece (20) wear out the one end of angle steel (19) peg graft in the locking hole, locking dish (22) terminal surface with angle steel (19) side butt, locking dish (22) with be provided with the driving medium between bracing piece (20).

9. The underwater bridge foundation construction method of claim 8, wherein: the driving medium sets up to transmission piece (23), transmission piece (23) with locking hole inner wall fixed connection, the side of bracing piece (20) tip is provided with spout (24), bracing piece (20) outer wall in spout (24) bottom is provided with arc wall (25), arc wall (25) length direction with spout (24) place cross-section plane is perpendicular setting, transmission piece (23) rotate extremely in arc wall (25), the other end of arc wall (25) is the closed setting.

10. The underwater bridge foundation construction method of claim 9, wherein: the angle steel (19) with between cofferdam (1) the wall and angle steel (19) and adjacent position all coats and has sealed glue film between angle steel (19), sealed glue film is provided with injecting glue hole and glue outlet, pours into the structure towards injecting glue hole and glues until glue outlet has the structure to glue to flow out, treats the structure glue solidification back, angle steel (19) with between cofferdam (1) the wall and angle steel (19) and adjacent form the structure glue film between angle steel (19).

Technical Field

The application relates to the field of bridge construction, in particular to a construction method of an underwater bridge foundation.

Background

With the rapid development of bridge construction technology, large bridges spanning rivers, lakes, seas and other water areas appear at present, and a plurality of piers of the bridges are located in deep water areas. In addition, for the aesthetic appearance of the bridge, the elevation of the top surface of the bearing platform of most deep water piers is designed below the normal water level of the water area, which needs to be realized by the construction process of deep water large-volume concrete bearing platforms, namely, the construction of the large-volume concrete bearing platforms in deep water. The method relates to the comprehensive influence of factors such as differences of geological conditions, water flow and water level changes, shipping and the like, and the selection of the type of the large-volume water retaining structure and the treatment method of the substrate of the large-volume water retaining structure are main factors for determining the safety, the economy and the timeliness of the construction process; the existing construction process or method for the foundation environment of the deep-water large-volume concrete bearing platform comprises the following steps: steel pouring jacket concrete back cover and steel sheet pile cofferdam concrete back cover.

The existing Chinese patent with patent publication number CN200810055678.4 provides a method for constructing a foundation of an underwater bridge, which comprises the following steps: inserting and driving steel sheet piles around the base of the bearing platform until the steel sheet piles are folded to form a cofferdam, and arranging an inverted filter layer at the bottom of the water in the cofferdam; arranging a steel structure vertical support; circularly performing the following two steps until pumping water to the inverted filter layer: mounting a steel structure inner support in the cofferdam; pumping water from the cofferdam outwards; and pumping water to the inverted filter layer, and pouring a concrete cushion. According to the scheme, the inverted filter layer is arranged in the cofferdam, so that the occurrence of sand running in the water pumping process is avoided under the condition that the cofferdam is not bottom-sealed, and the construction process is simplified; the concrete cushion is poured after water pumping, so that the construction of the bridge foundation is carried out in the environment similar to land, the operation is easier, the construction period is effectively shortened, the concrete for sealing the bottom is saved, and the construction cost is reduced; thereby realizing the safe, fast and low-cost construction environment for the underwater bridge foundation such as a pier bearing platform.

Aiming at the related technology, the inventor thinks that when the inner support is installed in the cofferdam, the inner support is fixed by adopting a welding mode at present, and after the bridge construction is finished, the inner support is not convenient to disassemble, so that the defect that the inner support is inconvenient to disassemble exists.

Disclosure of Invention

In order to solve the problem that the inner support is inconvenient to disassemble, the application provides a construction method for an underwater bridge foundation.

The construction method for the underwater bridge foundation adopts the following technical scheme:

a construction method of an underwater bridge foundation comprises the following steps,

s1, building a cofferdam, inserting and driving steel piles around the base of the bearing platform until the steel piles are folded to form the cofferdam, and arranging a reverse filter layer at the bottom of the cofferdam;

s2, arranging vertical supports, and arranging the vertical supports in the cofferdam in an inserting and beating mode;

s3, arranging a transverse support, and fixedly installing the transverse support between the wall surface of the cofferdam surrounded by the angle steel piles and the vertical support through a fixing device;

s4, pumping water from the interior of the cofferdam to the proper construction height, and repeating the operation of installing the transverse support in the S3 until the inverted filter layer is exposed;

s5, pouring a concrete cushion, and pouring the concrete cushion after pumping water to the inverted filter layer;

fixing device include two dead levers and two threaded rods, two dead levers respectively with the both ends fixed connection of horizontal support, two the threaded rod respectively with cofferdam wall and vertical braces fixed connection, the dead lever and the threaded rod is the level setting, the dead lever overcoat is established and is slided and is equipped with the thread bush, the thread bush with threaded rod threaded connection, the dead lever with be provided with the joint subassembly between the thread bush.

Through adopting above-mentioned technical scheme, after drawing water to treating the working position in the cofferdam, place horizontal support between cofferdam and vertical support, threaded rod and fixed rod tip butt, drive thread bush and threaded rod threaded connection, under the effect of joint subassembly, realize the fixed effect between dead lever and the threaded rod, accomplish the fixed effect of horizontal support and vertical support, it is removable to be convenient for simultaneously vertical support and horizontal support, promote the utilization of resources effect greatly, promote the efficiency of aquatic bridge foundation construction simultaneously.

Optionally, the joint subassembly includes joint ring and butt dish, the joint ring with the thread bush is kept away from in the one end fixed connection of threaded rod, the joint ring cover establish slide in outside the dead lever, the butt dish with the dead lever orientation the one end fixed connection of threaded rod, the butt dish with joint ring butt.

Through adopting above-mentioned technical scheme, when butt dish and joint ring butt, under the effect of dragging of thread bush and threaded rod threaded connection and butt dish and joint ring, realize horizontal support and cofferdam wall and vertical braces's fixed firm effect.

Optionally, the outer wall of the threaded sleeve is fixedly connected with a plurality of handles, the length direction of the handles is perpendicular to the axial direction of the threaded sleeve, and the handles are symmetrically arranged relative to the central axis of the threaded sleeve.

Through adopting above-mentioned technical scheme, the handle is used for applying the effort that makes its pivoted to the thread bush, is convenient for install the dismantlement to dead lever and threaded rod.

Optionally, the cofferdam wall surface and the equal fixedly connected with regulating block of vertical support, the regulating block is provided with the slide opening, the regulating block in the slide opening internal slipping is provided with adjusting screw, adjusting screw with threaded rod fixed connection, the regulating block in the slide opening department rotates and is connected with adjusting nut, adjusting nut with adjusting screw threaded connection, the regulating block is provided with and is used for restricting adjusting screw pivoted locating part.

Optionally, the limiting part is set as a limiting block, the outer wall of the adjusting screw is provided with a limiting groove along the length direction of the adjusting screw, the limiting block is connected in the limiting groove in a sliding manner, and two ends of the limiting groove are arranged in a closed manner.

Through adopting above-mentioned technical scheme, when drive adjusting nut rotated, the turning block rotated in rotating the inslot, and adjusting nut drove adjusting screw motion, under the relative motion effect of stopper and spacing groove, realized the effect to adjusting screw along slide opening length direction motion, and adjusting screw drove the threaded rod motion and moves towards horizontal support direction, realizes the regulation effect to the threaded rod position.

Optionally, adjusting nut fixedly connected with turning block, the adjusting block in the spout opening part has been seted up and has been rotated the groove, the turning block sets up to the L form, the cross-section that rotates the inslot wall sets up to the T style of calligraphy, the vertical section of turning block with adjusting nut fixed connection, the horizontal segment of turning block is in rotate the position rotation that the groove opening is big, the terminal surface of turning block horizontal segment is the arc setting.

Through adopting above-mentioned technical scheme, the motion of turning block orientation rotation groove opening part is restricted, and the turning block can only rotate at the rotation inslot, realizes the rotation effect between adjusting nut and the regulating block.

Optionally, when water is pumped in the cofferdam in the S4, sealing devices are arranged at four corners of the cofferdam, each sealing device comprises angle steel which is sequentially arranged in the vertical direction, a plurality of support rods are fixedly connected to two sides of each corner of the cofferdam, the angle steel is provided with support holes for the support rods to penetrate out, and the support rods are provided with locking pieces for clamping the angle steel.

Through adopting above-mentioned technical scheme, through the connection effect of angle steel to cofferdam corner position, to the infiltration of cofferdam corner seal, avoid the effect that cofferdam corner leaked, the angle steel increases the joint strength of cofferdam corner position simultaneously.

Optionally, the locking piece is a locking disc, the locking disc is provided with a locking hole, one end of the support rod penetrating through the angle steel is inserted into the locking hole, the end face of the locking disc is abutted against the side face of the angle steel, and a transmission part is arranged between the locking disc and the support rod.

Optionally, the transmission part is set as a transmission block, the transmission block is fixedly connected with the inner wall of the locking hole, a sliding groove is formed in the side face of the end portion of the supporting rod, an arc-shaped groove is formed in the bottom of the sliding groove in the outer wall of the supporting rod, the length direction of the arc-shaped groove and the cross-section circular plane where the sliding groove is located are perpendicular to each other, the transmission block rotates to the inside of the arc-shaped groove, and the other end of the arc-shaped groove is in a closed arrangement.

Through adopting above-mentioned technical scheme, pass the brace hole on the angle steel with the bracing piece, locate the bracing piece with the locking plate cover outside, the driving block slides in the spout this moment, drives the locking plate and rotates, and the locking plate drives in the driving block rotates to the arc wall, accomplishes the locking effect to the locking plate, and then realizes the fixed effect to the angle steel.

Optionally, a sealing adhesive layer is coated between the angle steel and the wall surface of the cofferdam and between the angle steel and the adjacent angle steel, the sealing adhesive layer is provided with an adhesive injection hole and an adhesive outlet hole, structural adhesive is injected towards the adhesive injection hole until the adhesive outlet hole has structural adhesive to flow out, and after the structural adhesive is cured, the structural adhesive layer is formed between the angle steel and the wall surface of the cofferdam and between the angle steel and the adjacent angle steel.

Through adopting above-mentioned technical scheme, all coating sealed glue between angle steel and cofferdam and adjacent angle steel, set up notes gluey hole and play gluey hole on the sealant layer, towards the downthehole injection structure of injecting glue and glue, treat that the hole of going out glues the back, stop to inject the structure and glue, treat that the structure glues the solidification back, accomplish the sealed effect of angle steel to the cofferdam.

In summary, the present application includes at least one of the following beneficial technical effects:

1. after the water in the cofferdam is pumped to a position to be worked, the transverse support is placed between the cofferdam and the vertical support, the end part of the fixed rod is abutted against the threaded rod, the threaded sleeve is driven to be in threaded connection with the threaded rod, the fixing effect between the fixed rod and the threaded rod is realized under the action of the clamping assembly, the fixing effect of the transverse support and the vertical support is finished, and the vertical support and the transverse support can be detached conveniently;

2. the supporting rod penetrates through a supporting hole in the angle steel, the locking disc is sleeved outside the supporting rod, the transmission block slides in the sliding groove at the moment, the locking disc is driven to rotate, the locking disc drives the transmission block to rotate into the arc-shaped groove, the locking effect on the locking disc is achieved, and the angle steel is further fixed;

3. all coating sealed glue between angle steel and cofferdam and adjacent angle steel, set up notes gluey hole and play gluey hole on sealed glue film, towards the downthehole injection structure of injecting glue and glue, wait to go out gluey back in the gluey hole, stop to inject the structure and glue, wait that the structure glues the solidification back, accomplish the sealed effect of angle steel to the cofferdam.

Drawings

FIG. 1 is a process flow diagram of an embodiment of the present application;

FIG. 2 is a schematic diagram of the overall structure of an embodiment of the present application;

FIG. 3 is a schematic view of a vertical support, lateral support and fixture in an embodiment of the present application;

FIG. 4 is a schematic view of a cofferdam, vertical supports, angle steel and support bars in the embodiment of the present application;

fig. 5 is an exploded view of the cofferdam, the angle iron, the support rod and the locking disk in the embodiment of the present application.

Reference numerals: 1. cofferdam; 2. a reverse filtering layer; 3. vertical support; 4. transversely supporting; 5. a concrete cushion; 6. fixing the rod; 7. a threaded rod; 8. a threaded sleeve; 9. a snap ring; 10. a butting tray; 11. a handle; 12. an adjusting block; 13. adjusting the screw rod; 14. adjusting the nut; 15. a limiting block; 16. a limiting groove; 17. rotating the block; 18. a rotating groove; 19. angle steel; 20. a support bar; 21. a support hole; 22. a locking disk; 23. a transmission block; 24. a chute; 25. an arc-shaped groove.

Detailed Description

The present application is described in further detail below with reference to figures 1-5.

The embodiment of the application discloses a construction method of an underwater bridge foundation. Referring to fig. 1 and 2, a method for constructing a foundation of an underwater bridge includes the steps of,

s1, building a cofferdam 1, sequentially and vertically inserting and driving steel piles around the base of the bearing platform until the steel piles are folded to form the cofferdam 1, arranging a reverse filter layer 2 at the bottom of the base in the cofferdam 1, wherein the reverse filter layer 2 in the cofferdam 1 is positioned at the bottom of the cofferdam 1, and playing a role in increasing the floating pressure resistance of the base when pumping water to prevent sand flowing inside the steel sheet pile cofferdam 1;

s2, arranging vertical supports 3, arranging the vertical supports 3 in the cofferdam 1 in an inserting and beating mode, and inserting the vertical supports 3 into a substrate;

s3, arranging a transverse support 4, and fixedly installing the transverse support 4 between the wall surface of the cofferdam 1 surrounded by the angle steel 19 piles and the vertical support 3 through a fixing device;

referring to fig. 2 and 3, the fixing device comprises two fixing rods 6 and two threaded rods 7, the two fixing rods 6 are respectively fixedly connected with two ends of a transverse support 4, the two threaded rods 7 are respectively fixedly connected with the wall surface of the cofferdam 1 and a vertical support 3, the fixing rods 6 and the threaded rods 7 are both horizontally arranged, a threaded sleeve 8 is sleeved outside the fixing rods 6 in a sliding manner, the threaded sleeve 8 is in threaded connection with the threaded rods 7, a clamping assembly is arranged between the fixing rods 6 and the threaded sleeve 8, the clamping assembly comprises a clamping ring 9 and a butting disc 10, the clamping ring 9 is fixedly connected with one end, far away from the threaded rod 7, of the threaded sleeve 8, the clamping ring 9 is sleeved outside the fixing rods 6 in a sliding manner, and the butting disc 10 is fixedly connected with one end, facing the threaded rods 7, of the fixing rods 6;

two handles 11 of 8 outer wall fixedly connected with of thread bush, 11 length direction of handle sets up along the axis direction of perpendicular to thread bush 8, two handles 11 are the symmetry setting for the central axis of thread bush 8, handle 11 is used for being convenient for exert its pivoted effort to thread bush 8, with the tip butt of butt dish 10 with threaded rod 7, drive thread bush 8 is towards 7 direction movements of threaded rod, thread bush 8 drives joint ring 9 towards 10 direction movements of butt dish, when butt dish 10 and 9 butts of joint ring, under the effect of dragging of thread bush 8 and 7 threaded rod threaded connection of threaded rod and butt dish 10 and joint ring 9, realize the fixed firm effect of horizontal support 4 and 1 wall in cofferdam and vertical braces 3.

In order to adapt to the transverse supports 4 with different length sizes conveniently, the wall surface of the cofferdam 1 and the wall surface of the vertical support 3 are fixedly connected with adjusting blocks 12, the adjusting blocks 12 are provided with sliding holes, the adjusting blocks 12 are provided with adjusting screws 13 in the sliding holes in a sliding mode, the adjusting screws 13 are fixedly connected with the end portions of the threaded rods 7, the adjusting blocks 12 are rotatably connected with adjusting nuts 14 at the opening portions of the sliding holes, the adjusting nuts 14 are fixedly connected with two rotating blocks 17, the adjusting blocks 12 are provided with rotating grooves 18 at the opening portions of the sliding holes, the two rotating blocks 17 are symmetrically arranged relative to the axis direction of the adjusting nuts 14, the vertical sections of the rotating blocks 17 are fixedly connected with the adjusting nuts 14, the horizontal sections of the rotating blocks 17 are rotated in the rotating grooves 18, the end faces of the horizontal sections of the rotating blocks 17 are arc-shaped, and the rotating effect between the adjusting nuts 14 and the adjusting blocks 12 is ensured.

Referring to fig. 2 and 3, the adjusting block 12 is provided with a limiting member for limiting the rotation of the adjusting screw 13, the limiting member is provided as a limiting block 15, the outer wall of the adjusting screw 13 is provided with a limiting groove 16 along the length direction thereof, two ends of the limiting groove 16 are closed, and the limiting block 15 is slidably connected in the limiting groove 16; when the adjusting nut 14 is driven to rotate, the rotating block 17 rotates in the rotating groove 18, the adjusting nut 14 drives the adjusting screw 13 to move, under the action of relative movement of the limiting block 15 and the limiting groove 16, the effect of moving the adjusting screw 13 along the length direction of the sliding hole is achieved, the adjusting screw 13 drives the threaded rod 7 to move and move towards the direction of the transverse support 4, the end portion of the threaded rod 7 is enabled to be abutted to the abutting disc 10, and the transverse supports 4 with different sizes can be mounted conveniently.

S4, pumping water from the interior of the cofferdam 1 to the outside to a proper construction height, repeating the work of installing the transverse support 4 in the S3, completing the support effect of the cofferdam 1 by the transverse support 4 after the water storage amount in the cofferdam 1 is less and less, and installing the transverse cofferdam 1 after the water pumping in the whole operation till the inverted filter layer 2 is exposed;

referring to fig. 4 and 5, when the cofferdam 1 is pumped in and out, sealing devices are arranged at four corners of the cofferdam 1, each sealing device comprises angle steel 19 which is arranged in sequence in the vertical direction, the angle steel 19 are arranged at the corners of the cofferdam 1 in sequence in the vertical direction, the cofferdam 1 is provided with support rods 20 which are fixedly connected with two side walls at the corners, each support rod 20 is arranged horizontally and perpendicular to the cofferdam 1, each angle steel 19 is provided with a support hole 21 through which each support rod 20 penetrates out, each angle steel 19 is hung on each support rod 20, and each support rod 20 is provided with a locking piece for clamping the angle steel 19.

The locking piece sets up to locking plate 22, locking plate 22 is provided with the locking hole, the one end that angle steel 19 was worn out to bracing piece 20 is pegged graft in the locking hole, 22 terminal surfaces of locking plate and 19 side butts of angle steel, be provided with the driving medium between locking plate 22 and the bracing piece 20, the driving medium sets up to driving block 23, driving block 23 and locking hole inner wall fixed connection, the side of bracing piece 20 tip is provided with spout 24, the 20 outer walls of bracing piece are provided with arc wall 25 in spout 24 bottom, arc wall 25 length direction is parallel for perpendicular setting with 24 places cross-section circles of spout, the one end and the spout 24 intercommunication of arc wall 25, the other end of arc wall 25 is the closed setting.

When the supporting rod 20 is inserted into the locking hole, the transmission block 23 moves along the length direction of the sliding groove 24 to drive the locking disc 22 to rotate, the transmission block 23 rotates to the arc-shaped groove 25 from the sliding groove 24, at the moment, the movement of the locking disc 22 and the supporting rod 20 along the axial direction of the supporting rod 20 is limited, meanwhile, the locking disc 22 is abutted to the angle steel 19, and then the angle steel 19 is extruded on the wall surface of the cofferdam 1 by the locking disc 22.

Sealant is coated between the angle steel 19 and the wall surface of the cofferdam 1 and between the angle steel 19 and the adjacent angle steel 19, after the sealant is cured, a sealant layer is formed between the angle steel 19 and the wall surface of the cofferdam 1 and between the angle steel 19 and the adjacent angle steel 19, a sealant injection hole and a sealant outlet are formed in the sealant layer, structural sealant is injected towards the sealant injection hole until the structural sealant flows out from the sealant outlet, after the structural sealant is cured, a structural sealant layer is formed between the angle steel 19 and the wall surface of the cofferdam 1 and between the angle steel 19 and the adjacent angle steel 19, under the action of the structural sealant layer and the sealant layer, the sealing effect of the corner position of the cofferdam 1 is ensured, meanwhile, the connection between the angle steel 19 and the cofferdam 1 is also based on the water pumping work, after the water is pumped to the work position, the angle steel 19 is installed, and the angle steel 19 is sealed between the angle steel 19, the cofferdam 1 and the adjacent angle steel 19.

S5, pouring the concrete cushion 5, and after pumping water to the inverted filter layer 2, pouring the concrete cushion 5, wherein the concrete layer is poured on the inverted filter layer 2 to increase the anti-floating pressure of the base and form a flat working surface to facilitate the construction of the bearing platform steel bars and concrete.

The implementation principle of the underwater bridge foundation construction method in the embodiment of the application is as follows: pumping water into the cofferdam 1, driving the adjusting nut 14 to rotate after the water is pumped to a designated working position, and moving the adjusting screw 13 in the sliding hole under the action of relative movement between the limiting block 15 and the limiting groove 16 to realize the adjusting effect on the position of the threaded rod 7;

abutting the abutting discs 10 on the fixing rods 6 at the two ends of the transverse support 4 against the end parts of the threaded rods 7, under the action of a handle 11, connecting the threaded sleeves 8 with the threaded rods 7 in a threaded manner, driving the clamping rings 9 to move towards the abutting discs 10 by the threaded sleeves 8, and completing the connection of the transverse support 4 with the cofferdam 1 and the vertical support 3 when the clamping rings 9 move to abut against the abutting discs 10; meanwhile, the angle steel 19 at the corner of the cofferdam 1 at the corresponding position is installed, the support rod 20 penetrates through the support hole 21 on the angle steel 19, the locking disc 22 is sleeved outside the support rod 20, the transmission block 23 slides in the sliding groove 24 at the moment, the locking disc 22 is driven to rotate, the locking disc 22 drives the transmission block 23 to rotate into the arc-shaped groove 25, the locking effect on the locking disc 22 is completed, and the fixing effect on the angle steel 19 is further realized;

all coating sealed glue between angle steel 19 and cofferdam 1 and adjacent angle steel 19, set up notes gluey hole and play gluey hole on the sealant layer, towards the downthehole injection structure of injecting glue and glue, wait to go out gluey back in the gluey hole, stop to inject the structure and glue, wait to glue the solidification back of structure, accomplish angle steel 19 to the sealed effect of cofferdam 1.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.