阅读说明：本技术 一种悬浮隧道用接头装置 (Suspended tunnel joint device ) 是由 赵辉 张文渊 孙红春 莫亚思 黄兆周 张炜婷 于 2021-05-21 设计创作，主要内容包括：本发明公开了一种悬浮隧道用接头结构,包括,一种悬浮隧道用接头结构,包括,第一管道,与所述第一管道接头的第二管道,所述第一管道和第二管道一者设有突出部,另外一者设有插槽,所述突出部与插槽之间形成接头空间；接头支撑体,所述接头支撑体设置于接头空间之间,用于产生抵抗水流的扰动力；提供体外预应力组件,所述提供体外预应力组件设置于接头空间外侧,通过施加力实现预应力的抵抗；接头中,所述接头支撑体以及提供体外预应力组件配合,间隔产生抵抗水流的扰动力以及施加力,以实现第一管道和第二管道的接头。本发明通过提供体外预应力组件和接头支撑体的配合,能够同时实现对于抵抗力以及预应力的产生,大大提高了隧道管节对接的成功率。(The invention discloses a joint structure for a suspension tunnel, which comprises a first pipeline and a second pipeline connected with the first pipeline, wherein one of the first pipeline and the second pipeline is provided with a protruding part, the other one of the first pipeline and the second pipeline is provided with a slot, and a joint space is formed between the protruding part and the slot; the joint support body is arranged between the joint spaces and is used for generating disturbance force resisting water flow; providing an external prestress assembly, wherein the external prestress assembly is arranged outside the joint space and realizes the resistance of prestress by applying force; in the joint, the joint support body is matched with the external prestressing assembly, and the external prestressing assembly is used for generating disturbance force resisting water flow and applying force at intervals so as to realize the joint of the first pipeline and the second pipeline. According to the invention, through the matching of the external prestress assembly and the joint support body, the resistance and the prestress can be generated simultaneously, and the success rate of butt joint of the tunnel pipe joints is greatly improved.)

1. A joint structure for a suspension tunnel is characterized by comprising,

the first pipeline is connected with the second pipeline of the first pipeline, one of the first pipeline and the second pipeline is provided with a protruding part, the other one of the first pipeline and the second pipeline is provided with a slot, and a joint space is formed between the protruding part and the slot;

the joint support body is arranged between the joint spaces and is used for generating disturbance force resisting water flow;

providing an external prestress assembly, wherein the external prestress assembly is arranged outside the joint space and realizes the resistance of prestress by applying force;

in the joint, the joint support body is matched with the external prestressing assembly, and the external prestressing assembly is used for generating disturbance force resisting water flow and applying force at intervals so as to realize the joint of the first pipeline and the second pipeline.

2. The joint structure of claim 1, wherein the joint support body forms a vacuum chamber by a change in pressure difference, so as to stabilize the joint structure during installation and resist water flow.

3. The joint structure for the suspension tunnel according to claim 2, wherein the joint support body includes a cavity, the cavity is provided with an exhaust valve, and the cavity is used for realizing the change of the pressure difference through exhausting.

4. The joint structure of claim 3, wherein before the joint, the interior of the chamber is filled with atmospheric pressure, and in the joint, the chamber is exhausted by the exhaust valve, so that a vacuum cavity is formed in the chamber, which causes the chamber to form a negative pressure with the external water body to resist water flow.

5. The coupling structure of claim 1, wherein one of the first and second pipes is an installed end pipe and the other is a pipe to be installed, and the external prestressing assembly is provided to extend along the installed end pipe to the pipe to be installed.

6. The joint structure for suspension tunnel of claim 5, wherein the external prestressing assembly is an automatic external prestressing tendon, and the automatic external prestressing tendon is applied to a stable manner step by step through prestressing, so as to realize at least 2 times of prestressing force tensioning output.

7. The joint structure for a suspension tunnel according to claim 1, further comprising a first water stopping unit disposed at one end of the joint support, wherein two ends of the first water stopping unit are respectively fixed to the first pipe and the second pipe for connection.

8. The joint structure for suspension tunnel according to claim 7, wherein the first water stopping unit is an Ω water stopping strip, and the Ω water stopping strip is disposed along the inner walls of the first and second pipes and fixedly connected to the first and second pipes.

9. The coupling structure of claim 1, further comprising sealing structures along the outer walls of the slots and the inner walls of the protrusions, the sealing structures being covered with the sealing structures, respectively, and the sealing structures achieve sealing at the coupling.

10. The coupling structure of claim 9, wherein the sealing structure includes a plurality of layers of filler-expanding agent that are water-swellable to effect a seal at the coupling.

Technical Field

The invention belongs to the technical field of auxiliary assembly parts of a suspension tunnel, and particularly relates to a connector device for the suspension tunnel.

Background

The pipe joint is an important connecting component between the tunnel pipe joints, and under the action of external load, the joint and the pipe joint body can bear the internal force and deformation of the tunnel together. Because the rigidity of the joint part is usually lower than that of a normal pipe joint body, the joint part is easy to become a stress concentration part and is the key of the key consideration of structural design.

Conventional underwater tunnel joint structures can be classified into flexible joints and rigid joints. The general flexible joint mainly comprises an end steel shell, a GINA water stop, an OMEGA water stop, a shearing key and a connecting prestressed steel cable, and the flexible joint is widely used for treating an intermediate joint by the advantages of convenient construction, strong adaptive deformability, good waterproof effect and the like, but has low structural strength and poor disturbance resistance under the condition of water flow; the general rigid joint mainly comprises an end steel shell, a GINA water stop, a connecting steel plate and reinforced concrete filled in a joint groove, and the joint is high in strength, high in construction difficulty, long in period and weak in deformation adapting capacity.

For joint forms of large-scale prefabricated structures in deep water environments, various designs exist, but traditional flexible joints and rigid joints have limitations in the aspects of construction difficulty, cycle length, structural strength, applicability and the like.

Disclosure of Invention

The invention aims to provide a joint structure for a suspension tunnel, which can resist disturbance of water flow and improve the success rate of butt joint of pipe joints by matching an external prestress assembly with a joint support body.

In order to achieve the technical effects, the invention is realized by the following technical scheme.

A joint structure for a suspension tunnel comprises,

the first pipeline is connected with the second pipeline of the first pipeline, one of the first pipeline and the second pipeline is provided with a protruding part, the other one of the first pipeline and the second pipeline is provided with a slot, and a joint space is formed between the protruding part and the slot;

the joint support body is arranged between the joint spaces and is used for generating disturbance force resisting water flow;

providing an external prestress assembly, wherein the external prestress assembly is arranged outside the joint space and realizes the resistance of prestress by applying force;

in the joint, the joint support body is matched with the external prestress assembly, and the disturbing force resisting water flow and the force are generated at intervals to realize the joint of the first pipeline and the second pipeline.

In this technical scheme, compare in prior art, increased the joint supporter, it mainly can produce the disturbance power of resisting rivers, certainly, when it is used for the external joint, can realize that external wind-force or other power cause the disturbance of contact to resist, improve the stability of joint department.

Among this technical scheme, the increase has provides external prestressing force subassembly, can ensure that whole prestressing force is resisted, and then realizes the increase of external book intensity, improves stability.

Among this technical scheme, utilize the joint supporter and provide external prestressing force subassembly and form dual strength guarantee to the whole structure of tunnel, the tunnel coupling is in butt joint work progress under the aquatic suspended state, through mutually complementary strong, the mutual restriction between them, the disturbance of resistance rivers that can be better, improves the success rate of coupling greatly. When the tunnel pipe joint to be installed is preliminarily butted with the installed tunnel pipe joint underwater, firstly, external prestress assembly ribs are automatically provided outside the pipe joint and extend from the installed end to the end to be installed, pretension is carried out after the external prestress assembly ribs are in place, the tensioning strength reaches 80% of a design value, and two adjacent pipe joints are primarily fixed. Then, the resistance of the joint support is performed. And then 10% of the rest design value of the external prestress component rib tensioning is provided. After that, the increase in the resistance is further performed. Finally, the remaining 10% of the design value providing the in vitro pre-stressed assembly was tensioned to completion. The cyclic operation can avoid the breakage of the external prestressing assembly caused by excessive air suction of the negative pressure cavity. The joint has better strength and stability than a weakly connected flexible joint, has good toughness, and can better release underwater disturbance force than a rigid joint.

As a further improvement of the invention, the joint support body forms a negative pressure vacuum cavity through the change of the pressure difference, so that the stability in the installation of the joint structure is realized, and the water flow resisting effect is realized.

In the technical scheme, the negative pressure vacuum cavity is utilized, so that all supports and part supports of the joint space can be realized, different disturbance forces are correspondingly generated, on one hand, water flows with different sizes are resisted, and on the other hand, the countermeasures of different regional disturbances are realized. Specifically, in the use process, the joint support body is a vacuum cavity structure, air is contained in the vacuum cavity structure during initial butt joint, air is exhausted through an exhaust valve to form a vacuum cavity, and a negative pressure relation is formed between the vacuum cavity and an external water body, so that the stability of the joint structure is realized.

As a further improvement of the invention, the joint support body comprises a cavity, an exhaust valve is arranged on the cavity, and the cavity realizes the change of the pressure difference through exhausting.

In the technical scheme, the idea of forming vacuum by exhausting is utilized, so that the vacuum cavity has certain strength, resistance can be generated, and disturbance force is realized. Simple structure, the realization is easy, can ensure the adjustment of holding power and change.

As a further improvement of the invention, before the joint, the cavity is filled with atmospheric pressure, in the joint, the cavity is exhausted by using the exhaust valve, a vacuum cavity is formed in the cavity, and the cavity and an external water body form negative pressure to resist the action of water flow.

In the technical scheme, the cavity of the vacuum cavity continuously exhausts air, the internal and external negative pressure difference is larger and larger, and the butt joint force of the two pipelines is increased along with the progress of the joint, so that the resistance is stronger and stronger; in particular, the resistance to the flow of water is achieved by the large pressure difference created between the inner and outer surfaces. As a further improvement of the present invention, one of the first pipe and the second pipe is an installed end pipe, and the other is a pipe to be installed, and the external prestressing assembly is provided to extend along the installed end pipe to the pipe to be installed.

Among this technical scheme, the utilization installed the pipeline, to waiting to install the pipeline extension, and then can make full use of the stability of installed the pipeline, during the realization later stage prestressing force increases, the stability of overall structure, the advantage of each pipeline of make full use of.

As a further improvement of the invention, the external prestressing assembly is an automatic external prestressing tendon, and the automatic external prestressing tendon is applied to a stable mode step by step through prestressing force, so that at least 2 times of prestressing force tensioning output is realized.

In the technical scheme, the automatic external prestressed tendons are applied to a stable mode step by step through prestress, and the stretching output of the prestress is at least realized for 2 times. Furthermore, in the whole process, the prestress can be ensured not to be damaged through multiple times of stretching, in addition, due to the matching with the joint support body, firstly, the automatic external prestressed tendons outside the pipe joints extend from the installed ends to the ends to be installed, pretensioning is carried out after the automatic external prestressed tendons are in place, the tensioning strength reaches 80% of the designed value, and the two adjacent pipe joints are primarily fixed. Then, the evacuation operation in the negative pressure chamber was performed to evacuate 90% of the gas. And then stretching the external prestressed tendons to 10% of the residual design value. And then, pumping out the residual 10% of gas in the negative pressure cavity to form a vacuum cavity. Finally, the tensioning of the remaining 10% of the design values providing the in vitro pre-stressing assembly is completed. The cyclic operation can avoid the external prestress damage caused by excessive air suction of the negative pressure cavity. The joint has better strength and stability than a weakly connected flexible joint, has good toughness, and can better release underwater disturbance force than a rigid joint.

As a further improvement of the invention, the water-stopping device further comprises a first water-stopping unit arranged at one end of the joint support body, and two ends of the first water-stopping unit are respectively fixed to the first pipeline and the second pipeline for connection.

In this technical scheme, set up first stagnant water unit, and then first stagnant water unit can realize guaranteeing to connect the course of the work to the stagnant water of pipe connection department that whole joint department has the stagnant water function.

As a further improvement of the present invention, the first water stopping unit is an omega water stopping strip, and the omega water stopping strip is arranged along the inner walls of the first pipeline and the second pipeline and is fixedly connected to the first pipeline and the second pipeline.

Among this technical scheme, omega stagnant water has certain support nature, can improve the intensity of stagnant water department, and its fixed connection, stability is stronger.

As a further improvement of the invention, the sealing structure is also included, the sealing structure is respectively covered along the outer wall of the slot and the inner wall of the protruding part, and the sealing structure realizes the sealing at the joint.

In the technical scheme, the joint end face adopts a full-coverage flexible sealing material to replace an end steel shell and a GINA water stop, the sealing joint area of two adjacent pipe joints is increased, and a better water sealing effect is achieved.

As a further improvement of the present invention, the sealing structure includes several layers of filled intumescent that swell in water to effect a seal at the joint.

In the technical scheme, the sealing structure can improve the whole sealing effect and improve the working efficiency by filling the expanding agent layer.

Drawings

Fig. 1 is a schematic structural diagram of a joint structure for a suspension tunnel according to the present invention;

fig. 2 is a first usage state diagram of a joint structure for a suspension tunnel according to the present invention;

fig. 3 is a second usage state diagram of a joint structure for a suspension tunnel according to the present invention;

in the figure:

1. a joint support; 11. an exhaust valve; 2. providing an external prestressing assembly; 3. a first water stopping unit; 4. a sealing structure 5 and a second water stop unit; 6. a water stop consolidation structure; 7. the inner wall is attached with a steel plate; 8. A hydraulic jack; 100. a first conduit; 200. a second conduit; 300. a protrusion; 400. and (4) a slot.

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

Example 1

The present embodiment will be described mainly in terms of a core structure of a coupling structure for a suspension tunnel, and particularly, with reference to fig. 1 to 2, includes, a coupling structure for a suspension tunnel, including,

a first pipe 100 and a second pipe 200 connected to the first pipe 100, wherein one of the first pipe 100 and the second pipe 200 is provided with a protrusion 300, the other one is provided with a slot 400, and a joint space is formed between the protrusion 300 and the slot 400;

the joint support body 1 is arranged between joint spaces and used for generating disturbance force resisting water flow;

providing an external prestress assembly 2, wherein the external prestress assembly 2 is arranged outside the joint space and realizes the resistance of prestress by applying force;

in the joint, the joint support body 1 and the external prestressing assembly 2 are matched, and the interval generates disturbance force resisting water flow and applies force so as to realize the joint of the first pipeline 100 and the second pipeline 200.

In this embodiment, compare in prior art, increased the joint supporter, it mainly can produce the disturbance power of resisting the rivers, certainly, when it is used for the external joint, can realize that external wind-force or other power cause the disturbance of contact to resist, improve the stability of joint department.

In this embodiment, the increase has provides external prestressing force subassembly, can ensure that whole prestressing force is resisted, and then realizes the increase of external book intensity, improves stability.

In this embodiment, utilize the joint supporter and provide external prestressing force subassembly and form dual strength guarantee to tunnel overall structure, the tunnel coupling butt joint work progress under aquatic suspended state through mutual reinforcement between them, restrict each other, can be better resist the disturbance of rivers, improve the success rate of coupling greatly. When the tunnel pipe joint to be installed is primarily butted with the installed tunnel pipe joint underwater, firstly, the automatic external prestressed tendons outside the pipe joint extend from the installed end to the end to be installed, pretension is carried out after the automatic external prestressed tendons are in place, the tensioning strength reaches 80% of a design value, and two adjacent pipe joints are primarily fixed. Then, the resistance of the joint support is performed. And then stretching the external prestressed tendons to 10% of the residual design value. After that, the increase of the resistance is further performed. Finally, the tensioning of the remaining 10% of the design values providing the in vitro pre-stressing assembly is completed. The cyclic operation can avoid the breakage of the external prestressing assembly caused by excessive air suction of the negative pressure cavity. Compared with a flexible joint which is connected weakly, the joint has better strength and stability, and simultaneously has better toughness, and can better release underwater disturbance force compared with a rigid joint.

Example 2

In this embodiment, the joint support 1 is mainly described and an external prestressing assembly is provided.

First, the joint support 1 is subjected to a pressure.

Specifically, the joint support body 1 forms a negative pressure vacuum cavity through the change of the pressure difference, so as to realize the stability in the joint structure installation and resist the water flow effect.

In this embodiment, utilize the negative pressure vacuum cavity, and then can realize that joint space's whole supports and partial support, correspond and produce different disturbance power, resist the rivers of equidimension not on the one hand, on the other hand, what realize is that the opposition of different regional disturbance is. Specifically, in the use process, the joint support body is a vacuum cavity structure, air is contained in the vacuum cavity structure during initial butt joint, air is exhausted through an exhaust valve to form a vacuum cavity, and a negative pressure relation is formed between the vacuum cavity and an external water body, so that the stability of the joint structure is realized.

Further, the joint support body 1 comprises a cavity, an exhaust valve 11 is arranged on the cavity, and the cavity realizes the change of the pressure difference through exhausting.

In this embodiment, the idea of forming vacuum by exhausting air is utilized, and the vacuum cavity has a certain strength, so that resistance can be generated to realize disturbance force. Simple structure, the realization is easy, can ensure the adjustment change of holding power.

Further, before the joint, the inside of the cavity is filled with atmospheric pressure, in the joint, the cavity is exhausted by using the exhaust valve 11, a vacuum cavity is formed in the cavity, and the cavity and an external water body form negative pressure to resist the action of water flow.

In the embodiment, the cavity of the vacuum cavity continuously exhausts air, the internal and external negative pressure difference is larger and larger, the butt joint force of the two pipelines is increased along with the progress of the joint, and the resistance is stronger and stronger; particularly, the resistance of the water flow is realized through the huge pressure difference formed between the inside and the outside. Secondly, it is directed to providing an extracorporeal pre-stressing assembly 2.

Specifically, when the external prestressing assembly 2 is installed, one of the first pipeline 100 and the second pipeline 200 is an installed end pipeline, and the other is a pipeline to be installed, the external prestressing assembly extends along the installed end pipeline to the pipeline to be installed.

In this embodiment, the pipeline that has been installed in the utilization, to waiting to install the pipeline extension, and then can make full use of the stability of installing the pipeline, during the realization later stage prestressing force increases, the stability of overall structure, the advantage of each pipeline of make full use of.

Specifically, provide external prestressing force subassembly 2 for automatic external prestressing tendons, automatic external prestressing tendons applys to stable mode step by step through the prestressing force, realizes the stretch-draw output of prestressing force 2 times at least.

In this embodiment, the automatic external prestressed tendons are applied to the stable mode step by step through the prestressing force, and the stretch-draw output of prestressing force is realized at least 2 times. And then in the whole process, through the drawing many times, can guarantee that prestressing force can not be damaged.

Again, the fitting process between the joint support 1 and the external prestressing assembly 2 is mainly described.

In actual use, the automatic external prestressed tendons outside the pipe joints extend from the installed ends to the to-be-installed ends, pretension is carried out after the automatic external prestressed tendons are positioned, the tensile strength reaches 80% of a design value, and two adjacent pipe joints are primarily fixed. Then, the evacuation operation in the negative pressure chamber is performed to evacuate 90% of the gas. And then stretching the external prestressed tendons to 10% of the rest design value. Then, the remaining 10% of the gas in the negative pressure chamber was evacuated to form a vacuum chamber. Finally, the tensioning of the remaining 10% of the design values providing the in vitro pre-stressing assembly is completed. The cyclic operation can avoid the damage of the external prestress providing component caused by excessive air suction of the negative pressure cavity. The joint form has better strength and stability than a weakly connected flexible joint, has good toughness and can better release underwater disturbance force than a rigid joint.

Example 3

In this embodiment, other processes are mainly described.

Specifically, as shown in fig. 2 to 3, the water sealing device further includes a first water sealing unit 3 disposed at one end of the joint support body 1, and two ends of the first water sealing unit 3 are respectively fixed to the first pipeline 100 and the second pipeline 200 for connection.

In this embodiment, set up first stagnant water unit, and then first stagnant water unit can realize guaranteeing to connect the course of the work to the stagnant water of pipeline junction, and whole joint department has the stagnant water function.

For the exhaust valve in embodiment 2, it is disposed at a side away from the first water stopping unit in the cavity. And further, the first water stop unit is supported.

Referring to fig. 2 to 3, the first water stopping unit 3 is an omega-shaped water stopping strip which is disposed along the inner walls of the first pipe 100 and the second pipe 200 and is fixedly connected to the first pipe 100 and the second pipe 200.

In this embodiment, omega stagnant water has certain support nature, can improve the intensity of stagnant water department, and its fixed connection, stability is stronger. Compare in simple formation waterstop, special structure can possess multiple effect, especially omega, and the both ends of its bottom can also realize with the fixed connection of other structures of outside, can provide the basis for the design in later stage.

Further, the sealing structure 4 is further included, the sealing structure 4 covers the outer wall of the slot 400 and the inner wall of the protrusion 300, and the sealing structure 4 realizes sealing at the joint.

In this embodiment, the joint terminal surface adopts the flexible airtight material of full-coverage formula to replace end steel casing and GINA waterstop, increases the airtight laminating area of two adjacent tube couplings, has better dense water effect. Adopt sealing material, can realize whole sealed, improve the stability of linking department.

Further, the sealing structure 4 includes several layers of filling expanding agent that expand in water to effect sealing at the joint.

In this embodiment, seal structure is through filling the expanding agent layer, and then can improve whole sealed effect, promotes work efficiency. Furthermore, a layer-by-layer structure is adopted, and the sealing performance among all the layers is stronger than that of the whole structure.

Example 4

In this embodiment, the description is given with reference to specific applications.

The invention relates to a joint structure suitable for a suspended tunnel, which is mainly applied to a deep water area crossing the sea and a lake, is generally positioned at least 30m underwater, has obvious tidal and storm effects, is used as an important connecting member between tunnel pipe joints, and can bear the internal force and deformation of the tunnel together with a pipe joint body under the action of external load. Because the rigidity of the joint part is usually lower than that of a normal pipe joint body, the joint part is easy to become a stress concentration part and is the key of the key consideration of structural design.

The pipe joint structure of the invention is additionally provided with a full-coverage flexible sealing material, a negative pressure vacuum cavity, a dual external prestress providing component and other structures on the basis of reserving an inner side water stop, a closed connecting steel plate and a prestress key of the traditional flexible joint and rigid joint. The joint form of the invention has the following obvious advantages:

firstly, the invention adopts a shear key structure with a convex front part and a concave rear part, namely, the end head of the pipe joint of the front section is in a convex shape, and the end head of the pipe joint butted with the rear section is in a concave shape, so that the traditional multi-tooth shear key of a flat shell end is replaced, the effective thickness of the joint structure is ensured, the structure is simpler, the structural strength and the interference resistance are better, and the butt joint construction is more convenient.

Secondly, the invention adopts two different joint forms of an overwater butt joint (dry land environment) and an underwater butt joint (wet water environment) according to different installation environments of the joints. The overwater butt joint can be completed when the dock is prefabricated, after the small pipe section is prefabricated, the joints of the two pipe sections are accurately butted, air in the negative pressure vacuum cavity is discharged through the exhaust valve, the inner OMEGA water stop is installed, inner high-strength prestress is tensioned, and the water stop is installed on the outer side at the last and is poured to be closed. The structure is convenient to construct, the rigidity of the joint is ensured by the vacuum cavity and the prestressed tendons, and the structure has good deformation applicability.

Thirdly, the underwater butt joint is installed in an underwater dynamic environment, the initial stability of the structure butt joint can be completed by exhausting and locking through the negative pressure vacuum cavity, the external prestress is tensioned and fastened by the automatic hydraulic jack, and a stable structure capable of resisting fluid disturbance is formed underwater. After all the pipe sections are butted, the tunnel is pumped one by one to form a dry environment, the inner side water stop strips, the closed connecting plates and the prestressed ribs are installed, and the structural strength is superposed for the second time to form a final joint structure.

Fourthly, the end face of the joint is made of a fully-covered flexible sealing material to replace an end steel shell and a GINA water stop belt, so that the sealing joint area of two adjacent pipe joints is increased, and a better water sealing effect is achieved;

fifthly, the negative pressure vacuum cavity and the external prestress assembly form double strength guarantee for the whole structure of the tunnel, and in the butt joint construction process of the tunnel pipe joints in the suspension state in water, the tunnel pipe joints can better resist disturbance of water flow through mutual reinforcement and mutual restriction of the tunnel pipe joints and greatly improve the success rate of butt joint of the pipe joints. When the tunnel pipe joint to be installed is primarily butted with the installed tunnel pipe joint underwater, firstly, the automatic external prestressed tendons outside the pipe joint extend from the installed end to the end to be installed, pre-tensioning is carried out after the automatic external prestressed tendons are in place, the tensioning strength is up to 80% of the set value, and two adjacent pipe joints are primarily fixed. Then, the evacuation operation in the negative pressure chamber is performed to evacuate 90% of the gas. And then stretching the external prestressed tendons to 10% of the residual design value. And then, pumping out the residual 10% of gas in the negative pressure cavity to form a vacuum cavity. And finally, tensioning the residual 10 percent of the designed value of the external prestressed assembly. The cyclic operation can avoid the breakage of the external prestressing assembly caused by excessive air suction of the negative pressure cavity. The joint has better strength and stability than a weakly connected flexible joint, has good toughness, and can better release underwater disturbance force than a rigid joint.

The joint structure has the advantages that the joint construction is more convenient and the joint structure strength is improved by arranging structures such as an external prestress assembly, a negative pressure vacuum cavity, a closed material covered by a full section and the like.

The connector of the invention adopts a shear key structure with a convex front part and a concave rear part, and compared with the traditional small-block-shaped shear key, the structure is simple, the shear key has good effect, and the butt joint construction difficulty is reduced. The end face of the pipe joint is made of large-area flexible sealing materials, so that the contact area of the end face of the pipe joint is increased, and the pipe joint has a better joint water-sealing effect. The outer side of the underwater butt joint structure is further provided with an automatic external prestress providing assembly, an automatic hydraulic jack is adopted, when the pipe joint is butted underwater, the mechanical arm of the external prestress providing assembly extends from the installed end to the end to be installed to be contracted and fixed, an external force consolidation system is formed, and the overall strength of the structure is enhanced. The inner side of the pipe joint is provided with an external prestress assembly, and a system of a strong joint is additionally added.

In the present invention, the joint structure is composed

The joint structure of the invention is divided into an upper joint and an underwater joint, and the structure of the joint structure comprises the following components:

when used in a marine environment, it is necessary to include a second water stopping unit 5; namely, a water stop strip: the water stop strip adopts a middle-buried water stop strip, is arranged in a groove on the periphery of the outer side of the above-water butt joint, and is sealed by pouring concrete after the installation is finished.

Second seal structure 4: the butt joint pipe joint is arranged on the end face of the butt joint pipe joint in a large area, adopts the water-swelling sealing material, slightly swells after meeting water, can be tightly attached, and has a good water-tight effect.

The first water stopping unit 3 is an omega water stopping belt: the two pipe joints are arranged on the inner side of the end part of the pipe joint in a circle and are connected and butted by fastening steel plates and bolts.

The waterstop consolidation structure 6 on the first water stop unit 3: the omega water stop consists of a steel plate and a bolt and is used for fixing the omega water stop.

Joint support 1, i.e. negative pressure vacuum chamber: the end surfaces of the two sections of pipe joints which are butted are respectively provided with a concave structure to form a cavity structure, and the cavity is communicated with the outside by an exhaust valve. After the construction of the middle-buried water stop strip, the omega-shaped water stop strip and the external prestress assembly provided at the inner side of the water joint is completed, discharging water gas in the cavity through an exhaust valve to form a negative pressure vacuum cavity; after the external prestress assembly is automatically provided by the underwater joint and tensioned, the water and the air in the cavity are discharged through the exhaust valve to form a negative pressure vacuum cavity.

Inner wall-bonded steel plate 7: the steel plate is arranged on the inner side of the pipe joint, covers the omega water stop for a circle, and is welded and fixed with the omega water stop strip fixing structure in a dry environment.

Providing an external pre-stressing assembly 2: the high-strength prestressed steel bars are arranged on the inner side of the pipe joint structure and are used for prestress tensioning construction in a dry environment.

Closed loop of cast-in-place concrete: the joint design on water is at pipe coupling outside a week reservation recess, treats the preliminary butt joint back of pipe coupling, pours the recess concrete behind the formula stagnant water strip of burying in the installation, forms rigid closed loop.

Exhaust valve 11: the negative pressure vacuum cavity is communicated with the outside, and a high-pressure air exhaust system is adopted to exhaust air from the cavity to the outside in a single direction.

The other provides an external prestressing assembly (i.e. hydraulic jack 8): the hydraulic jack system is arranged on one side of the installed pipe section. After the pipe joint to be installed and the installed pipe joint are initially butted, the external prestress assembly mechanical arm is provided to stretch to the corresponding position of the pipe joint to be installed, and the hydraulic jack is contracted and fastened.

The docking construction step in this embodiment mainly includes 2 construction environments:

the first method comprises the following steps: water butt joint

The construction steps of the overwater butt joint are as follows:

the pipe joint structure is prefabricated, and the embedded structure and the end part structure are installed in the prefabricating process.

And the front pipe joint and the rear pipe joint are preliminarily butted, and the sealing material is fully attached and tightly closed.

Air in the cavity is pumped out through the exhaust valve to form a negative pressure vacuum cavity.

And (5) installing an omega water stop at the inner side of the pipe joint, and welding an inner wall laminated steel plate.

And installing and tensioning the inner side of the pipe joint to provide an external prestress assembly until the design required value is reached.

And mounting a buried water stop strip in the outer side of the pipe joint, and pouring outer groove concrete for sealing.

And the second method comprises the following steps: underwater butt joint

The underwater butt joint construction method comprises the following steps:

after the large sections of the overwater butt joint pipe sections are butt jointed, the two ends of the large sections are sealed and transported to a construction site in a floating mode, after coarse positioning, water is injected and sinks to a designed elevation, and then fine positioning butt joint construction is carried out by using a barge to drag.

And after the mounting segment is preliminarily butted with the mounted segment, fully attaching the sealing material tightly.

And providing an external prestress assembly mechanical arm to stretch to a corresponding position of the pipe joint to be installed, and retracting and fastening the hydraulic jack.

Air in the cavity is pumped out through the exhaust valve to form a negative pressure vacuum cavity. And providing fine adjustment of the hydraulic jack of the external prestress assembly along with the compression amount of the negative pressure vacuum cavity.

And after the pipe joint structures are completely installed, pumping water in the pipe joints to form a dry environment, installing omega-shaped water stops on the inner sides of the pipe joints, and welding an inner wall laminated steel plate.

And installing and tensioning the inner side of the large section to provide an external prestress assembly until a design required value is reached.

The joint structure of the invention is different according to the butt joint environment of pipe joints, has the characteristics of simple and convenient construction and strong applicability of the joint structure, designs two joint structures of water butt joint and underwater butt joint, and has the following advantages:

the connector of the invention adopts a shear key structure with a convex front part and a concave rear part, namely, the end head of the pipe joint at the front section is in a convex shape, and the end head of the pipe joint butted with the rear section is in a concave shape.

According to different construction environments when the connectors are butted, the connector structure is divided into an overwater butt joint mode and an underwater butt joint mode, the overwater butt joint is completed in a dry environment, the underwater butt joint is completed in a deep water environment, and the two connectors are different in structure composition, structure rigidity and construction difficulty.

The end faces of the two joint structures are provided with large-area flexible sealing materials, so that the contact area of the end faces of the pipe joints is increased, and the joint sealing structure has a better joint water-sealing effect.

The omega water stop and the external prestress providing component are arranged on the inner sides of the two joint structures in one circle. And (3) the underwater butt joint is used for completely finishing the underwater structure, the installation construction of the omega water stop is carried out after a dry environment is formed in the pipe joint, and the outer side of the water stop is attached with a steel plate for joint fixing. And finally, installing an external prestress component, tensioning to a design value, and adding a system of the strong joint.

According to the invention, the end surfaces of the two joint structures are respectively provided with the negative pressure vacuum cavity and the exhaust valve, after the two pipe joints are butted, the exhaust valve is used for exhausting water and gas in the cavity to form a negative pressure vacuum structure, the negative pressure vacuum structure perfectly utilizes the outside deep water pressure to complete the closing of the joint, the joint sealing effect is good, and the structural strength is high.

The butt joint structure on water reserves the recess along tube coupling outside a week, when carrying out the butt joint after the prefabricated tube coupling is accomplished, buries the sealing rod underground to it connects sealedly to pour concrete, and its construction convenience and stagnant water are effectual.

The outer side of the underwater butt joint structure is further provided with an automatic external prestress providing assembly, an automatic hydraulic jack is adopted, when the pipe joint is butted underwater, the external prestress providing assembly mechanical arm is extended to the end to be installed to be contracted and fixed from the installed end, an external force consolidation system is formed, and the overall strength of the structure is enhanced.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.