Bridge closure structure and construction method thereof

Abstract

The application relates to the field of bridge engineering and discloses a bridge closure structure and a construction method thereof, which comprises a left pier body, a right pier body, a left beam body, a right beam body and a steel closure unit, the bottom of the left pier body and the right pier body is provided with a rotating body unit; the left beam body is provided with a left butt joint part of a steel structure, a plurality of first butt joint grooves and second butt joint grooves in T shapes are vertically arranged on the left butt joint part; the right beam body is provided with a right butt joint part, the right butt joint part is provided with a plurality of first butt joint plates and second butt joint plates in T shapes; the steel closure unit comprises a hydraulic winding device, a left built-in track, a right built-in track and a closure traction rope, the left built-in track is circumferentially arranged in the inner wall of the left beam body, the right built-in track is circumferentially arranged in the inner wall of the right beam body, a left supporting steel pipe is arranged in the left built-in track, a right supporting steel pipe is arranged in the right built-in track, and the closure traction rope can be wound on the hydraulic winding device. The application aims to solve the technical problem of how to quickly complete the closure of a bridge.

Description

Technical Field

[0001] This invention relates to the field of bridge engineering, and specifically discloses a bridge closure structure and its construction method. Background Technology

[0002] Bridge closure refers to the process of joining bridges, embankments, dams, or other structures constructed from both ends in the middle. In bridge engineering, closure, also known as "joining," is a crucial step in bridge construction.

[0003] There are two methods for bridge closure: translational closure and rotational closure. The basic steps of rotational closure are as follows: pour the pier and beam body, and install a turntable in the middle of the abutment below the pier body. Use automatic continuous jacks, hydraulic pumps and main control consoles to pull the pier and beam body to turn around, and connect the two beam bodies in mid-air above the road or river to complete the closure.

[0004] A method (202210843623.X) describes a bridge rotation structure and its construction method. The bridge rotation structure includes a first central pier, a first connecting beam, a rotation device, a second central pier, a second connecting beam, a third central pier, a sliding track, and a sliding device. The first connecting beam is positioned above the first central pier. The rotation device is positioned between the first central pier and the first connecting beam, with both sides of the device fixedly connected to the first central pier and the first connecting beam, respectively. The second central pier is positioned on both sides of the existing bridge, and the second connecting beam is positioned on top of the second central pier. A sliding track and a sliding device are provided between the second connecting beam and the second central pier. By setting the second central pier as a temporary central pier, the problem of the first and second connecting beams being positioned above the existing bridge during closure is avoided, ensuring the operational safety of the existing railway. After the mid-span closure, the continuous beam is slid from the second central pier to the third central pier, achieving the crossing of the existing bridge. This method can cross existing bridges and uses a sliding method to set up the connecting beam. However, the existing method and the closure method in the prior art have the following drawbacks: the installation of the rotation support is an important part of the bridge rotation. If the accuracy and force control deviation exceeds 1mm, it may cause the huge rotating shaft to be difficult to rotate, and the bridge cannot be closed. When closing, concrete needs to be poured to form the bridge deck and connect the beams on both sides, which leads to the extension of the entire construction period. At the same time, when pouring concrete, it is also necessary to erect a steel reinforcement structure, which is also relatively troublesome. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a bridge closure structure and its construction method to solve the technical problem of how to quickly complete the bridge closure.

[0006] To achieve the above objectives, the present invention provides the following technical method:

[0007] A bridge closure structure includes a left pier, a right pier, a left beam, a right beam, and a steel closure unit. Both the left and right piers have rotation units at their bottoms. Both the left and right piers have vibration-damping supports. The right pier also has a first jack. The right beam is mounted on the vibration-damping supports and the first jack on the right pier, and the left beam is mounted on the vibration-damping supports on the left pier. The left beam has a steel left connecting section with several T-shaped first and second connecting slots vertically arranged on it. The first connecting slots are located at the upper part of the left connecting section, and the second connecting slots are located at the lower part of the left connecting section. The size of the first connecting slot is larger than that of the second connecting slot. The right beam has a right connecting section with several T-shaped first and second connecting plates. The steel closure unit includes a hydraulic winder, a left internal track, a right internal track, and a closure traction rope. The left internal track is circumferentially arranged in the inner wall of the left beam, and the right internal track is circumferentially arranged in the inner wall of the right beam. A left support steel pipe is provided in the left internal track, and the end of all left support steel pipes away from the right beam is fixedly connected by a left ring frame. A right support steel pipe is provided in the right internal track, and the end of all right support steel pipes away from the left beam is fixedly connected by a right ring frame. The hydraulic winder is located on the ground, and the closure traction rope can be wound on the hydraulic winder. The closure traction rope can enter the left and right beams and pull the left and right support steel pipes to move towards each other.

[0008] This scheme employs a bottom-rotation closure method, using a rotation unit to simultaneously rotate the pier and beam. A first jack is included, which lifts the right beam upwards. Once the left and right beams are aligned, the first jack lowers the right beam, completing the closure. This structure and method allow for rapid closure of the left and right beams. After adjusting their vertical positions, the left and right joints can be seamlessly connected, requiring only bolts for subsequent fixing, significantly reducing closure time. To improve structural stability at the closure joint, this scheme includes a left and right internal track, a left support steel pipe, and a right support steel pipe. The left and right support steel pipes are staggered, and a hydraulic winder and closure traction rope are used to pull them into the right and left internal tracks for fixation.

[0009] Optionally, both the left and right internal tracks include C-shaped track rings. The track rings are arranged circumferentially along the inner wall of the left / right beam and along its length. The number and position of the track rings in the left / right beam are the same. The number and position of the left / right support steel pipes in the left / right beam are the same and staggered. After the left support steel pipe is moved, it can be inserted into the track ring of the right beam, and after the right support steel pipe is moved, it can be inserted into the track ring of the left beam.

[0010] Optionally, the left support steel pipe, the right support steel pipe, and the track ring are all provided with screw holes, into which bolts can be screwed for fixation. In this solution, the left support steel pipe and the right support steel pipe can be fixed in the track ring.

[0011] Optionally, the left and right support steel pipes are provided with a plurality of injection holes. During subsequent concrete pouring, concrete can enter the interior of the left / right support steel pipes through the injection holes.

[0012] Optionally, counterweight water tanks are installed on both the left and right beams, with the tanks positioned at the lower end of the opposite sides of the beams. A solenoid valve is installed at the bottom of each counterweight water tank. Using this design, the counterweight water tanks can provide counterweight to the left / right beams during bridge rotation, maintaining their balance. The solenoid valves control the water flow rate from the counterweight water tanks to accommodate changes in the mass or center of gravity of the left / right beams.

[0013] Optionally, the rotating unit includes a foundation, an upper ball joint, a lower ball joint, connecting blocks, a rotating traction rope, and a hydraulic traction machine. The foundation is located on the ground, and a spherical groove is formed at the upper end of the foundation. The lower ball joint is located in the spherical groove, and the upper ball joint is fixedly located at the upper end of the lower ball joint. The upper ball joint is connected to the bottom of the left / right pier. The upper ball joint is provided with several connecting blocks. The two ends of the rotating traction rope are respectively connected to the hydraulic traction machine and the connecting blocks. The hydraulic traction machine can pull the rotating traction rope, which in turn pulls the upper and lower ball joints to rotate. In this scheme, after starting the hydraulic traction machine, the rotating traction rope can be pulled, which in turn pulls the upper and lower ball joints to rotate and drives the left / right pier to rotate, realizing the simultaneous rotation of the pier and the beam. Moreover, these large pieces of equipment are easier to install when located on the ground, and some structures can be prefabricated and transported to the site for direct installation.

[0014] The construction method for bridge closure structures includes the following steps:

[0015] S1, Drilled pile and pile cap construction: 9 drilled piles with a diameter of 1-2m and a length of 25-35m are constructed and arranged in a square array under the pile cap; the pile cap is constructed by casting using the sinking pile cap construction method.

[0016] S2, Arrange the rotating unit, pour a foundation on the pier, install an annular guide rail and a lower ball joint on the foundation, set several sliding ball holes in the spherical groove of the lower ball joint, and set several sliding balls in the sliding ball holes. The sliding balls are made of resin material, and the spherical groove is coated with lubricating oil; then set the formwork and pour concrete, seal the lower part of the lower ball joint and the annular guide rail with concrete, exposing the upper end face of the spherical groove and the annular guide rail; then install the upper ball joint, install the connecting block on the upper ball joint, and the lower ball joint rotates in contact with the upper ball joint; finally install the hydraulic traction machine and the rotating traction rope.

[0017] S3, build the left pier / right pier on the upper ball joint, then install the vibration damping bearing and the first jack on the right pier, install the vibration damping bearing on the left pier, and then build the left beam and the right beam;

[0018] S4, install the steel closure unit, and install the left built-in track, right built-in track, left support steel pipe and right support steel pipe inside the left beam and right beam;

[0019] S5, bridge rotation and closure, start hydraulic traction machine, hydraulic traction machine pulls rotation traction rope, rotation traction rope drives the connecting block to rotate, connecting block drives the upper ball joint to rotate, upper ball joint drives the left pier / right pier and left beam / right beam to rotate;

[0020] S6, Bridge docking: Activate the first jack, which moves the right pier downwards, allowing the left and right docking sections to connect. Then, install bolts to secure the connection.

[0021] S7. Install a hydraulic winder on the ground, and install closure traction ropes on the hydraulic winder. One closure traction rope enters from the left beam and connects to the right support steel pipe, while the other closure traction rope enters from the right beam and connects to the left support steel pipe. After starting the hydraulic winder, the closure traction ropes drive the left support steel pipe to move into the right internal track, and the right support steel pipe to move into the left internal track. Then, support rectangular ring-shaped templates in the left and right beams. The templates surround the left and right support steel pipes, and then pour concrete into them to form a rectangular ring-shaped steel pipe concrete structure to fix the connection between the left and right beams.

[0022] The working principle and beneficial effects of this method are as follows:

[0023] In this design, the bridge rotation simultaneously rotates the piers and beams. The left and right beams are at different heights during rotation, with the right beam above the left. Therefore, collisions between the left and right beams are not a concern during rotation. A first jack is installed on the right pier, which can move the right beam downwards. Once the left and right beams are in position, the first jack can lower the right beam, allowing its right connecting part to align with the left connecting part of the left beam. In this design, the left and right connecting sections are joined vertically, allowing for a seamless connection secured with bolts. To enhance stability and ease of connection, the first connecting plate of the right section is positioned above the second, with the second plate smaller than the first. Similarly, the first connecting groove of the left section is positioned above the second connecting groove, which is smaller. Therefore, as the first and second connecting plates move downwards, the second plate passes through the first connecting groove and continues downwards, while the first plate directly engages with the first connecting groove. At this point, the second plate also engages with the second connecting groove, completing the closure. Compared to existing technologies, this design adds the downward movement of the right beam, but eliminates the need for precast concrete components and closure casting between the two beams. The steel left and right connecting sections replace these steps, making the process simpler and more convenient. In this scheme, it is possible to choose whether to add an internal casting process for the left and right beams. If necessary, formwork can be erected at the left and right support steel pipes and a rectangular ring-shaped concrete steel pipe structure can be cast to increase the strength and stability of the connection between the left and right beams. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of an embodiment;

[0025] Figure 2 A schematic diagram of the left and right docking sections;

[0026] Figure 3 Structural diagrams of the left and right piers;

[0027] Figure 4 This is a structural schematic diagram of the steel closure unit;

[0028] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0029] Figure 6 This is a schematic diagram of the rotating unit.

[0030] The following are the markings in the attached diagram: 1. Left pier body; 2. Right pier body; 3. Pier cap; 4. Drilled pile; 5. Foundation seat; 6. Circular guide rail; 7. Hydraulic traction machine; 8. Limiting plate; 9. Support slide; 10. Left docking part; 11. Right docking part; 12. Hydraulic winder; 13. Closure traction rope; 14. Left beam body; 15. Right beam body; 16. First docking groove; 17. First docking plate; 18. Second docking groove; 19. Second docking plate; 20. Vibration damping support; 21. First jack; 22. Left support steel pipe; 23. Right internal rail; 24. Left internal rail; 25. Rail ring; 26. Grouting hole; 27. Lower ball joint; 28. Sliding ball; 29. ​​Upper ball joint; 30. Connecting block; 31. Detailed Implementation

[0031] The following detailed description illustrates the specific implementation method:

[0032] Example

[0033] A bridge closure structure, such as Figures 1-6 As shown, it includes left pier 1, right pier 2, left beam 14, right beam 15 and steel closure unit.

[0034] Combination Figure 6 Both the left pier 1 and the right pier 2 have rotating units at their bottoms. Each rotating unit includes a foundation 5, an upper ball joint 30, a lower ball joint 28, a connecting block 31, a rotating traction rope, and a hydraulic traction machine 7. Below the foundation 5 are a pile cap 3 and bored piles 4, arranged in a square array of nine piles below the pile cap 3. The foundation 5 is a concrete structure cast above the pile cap 3. A lower ball joint 28 is fixedly mounted on the foundation 5. The upper end of the lower ball joint 28 has a spherical groove with several sliding ball holes. Several sliding balls 29 made of resin material are placed in the sliding ball holes. The upper ball joint 30 is rotatably mounted on the lower ball joint 28 and has a connecting block 31 mounted on it. The upper ball joint 30 is connected to the bottom of the left pier 1 / right pier 2. The hydraulic traction machine 7 is mounted on the foundation 5 via a base frame. The two ends of the rotation traction rope are connected to the hydraulic traction machine 7 and the connecting block 31, respectively. The hydraulic traction machine 7 pulls the rotation traction rope, which in turn pulls the upper ball joint 30 and the lower ball joint 28 to rotate. The foundation 5 is also equipped with an annular guide rail 6. Several limiting plates 8 are installed at the upper end of the annular guide rail 6, with two limiting plates forming a group, respectively positioned on the inner and outer sides of the annular guide rail 6. A support slide 9 is slidably mounted on the annular guide rail 6. The support slide 9 is arc-shaped, and its curvature is the same as that of the annular guide rail 6.

[0035] Counterweight water tanks are installed on both the left beam 14 and the right beam 15. The counterweight water tanks are located at the lower end of the opposite side of the left beam 14 and the right beam 15, and a solenoid valve is installed at the bottom of the counterweight water tank. The structure of the water tank is relatively simple and belongs to a relatively mature existing technology, so it is not shown in the figure.

[0036] Vibration damping supports 20 are installed on both the left pier 1 and the right pier 2, and a first jack 21 is also installed on the right pier 2. The right beam 15 is mounted on the vibration damping supports 20 and the first jack 21 on the right pier 2, and the left beam 14 is mounted on the vibration damping supports 20 on the left pier 1. The left beam 14 is provided with a steel left connecting part 10, which can be specifically configured by pre-embedding a splice plate in the concrete structure of the left beam 14, and providing a splice groove at one end of the left connecting part 10, allowing the splice plate to mate with the splice groove, and then fixing it with bolts. Several T-shaped first connecting grooves 16 and second connecting grooves 18 are vertically arranged on the left connecting part 10. The first connecting grooves 16 are located at the upper part of the left connecting part 10, and the second connecting grooves 18 are located at the lower part of the left connecting part 10. The size of the first connecting grooves 16 is larger than that of the second connecting grooves 18. The right beam 15 is provided with a right docking part 11. The right docking part 11 is provided with a plurality of T-shaped first docking plates 17 and second docking plates 19. The first docking plates 17 are located above the second docking plates 19. The size of the first docking plates 17 is larger than that of the second docking plates 19. The first docking plates 17 can cooperate with the first docking groove 16, and the second docking plates 19 can cooperate with the second docking groove 18.

[0037] The steel closure unit includes a hydraulic winder 12, a left internal track 25, a right internal track 24, and a closure traction rope 13. The left internal track 25 is circumferentially arranged in the inner wall of the left beam 14, and the right internal track 24 is circumferentially arranged in the inner wall of the right beam 15. A left support steel pipe 22 is provided in the left internal track 25, and the ends of all left support steel pipes 22 away from the right beam 15 are fixedly connected by a left ring frame. A right support steel pipe 23 is provided in the right internal track 24, and the ends of all right support steel pipes 23 away from the left beam 14 are fixedly connected by a right ring frame. Both the left internal track 25 and the right internal track 24 include C-shaped track rings 26. The track rings 26 are arranged circumferentially along the inner wall of the left beam 14 / right beam 15 and along its length. The number and position of the track rings 26 in the left beam 14 / right beam 15 are the same. The number and position of the left support steel pipes 22 / right support steel pipes 23 in the left beam 14 / right beam 15 are the same and staggered. The left support steel pipe 22 can be inserted into the track ring 26 of the right beam 15 after being moved, and the right support steel pipe 23 can be inserted into the track ring 26 of the left beam 14 after being moved. The left support steel pipe 22, right support steel pipe 23, and track rings 26 are all provided with screw holes, into which bolts can be screwed for fixation. The left support steel pipe 22 and right support steel pipe 23 are provided with several injection holes 27. The hydraulic winder 12 is set on the ground. The closure traction rope 13 can be wound on the hydraulic winder 12. The closure traction rope 13 can enter the left beam 14 and the right beam 15 and pull the left support steel pipe 22 and the right support steel pipe 23 to move towards each other.

[0038] In practice:

[0039] The construction method for bridge closure structures includes the following steps:

[0040] S1, Construction of bored piles 4 and pile cap 3: Construction of 9 bored piles 4, each with a diameter of 1-2m and a length of 25-35m, arranged in a square array under pile cap 3; Pile cap 3 is constructed by casting using the sinking pile cap 3 construction method.

[0041] S2, arrange the rotation unit, pour the foundation seat 5 on the foundation 3, install the annular guide rail 6 and the lower ball joint 28 on the foundation seat 5, the foundation seat 5 is provided with a frame for installing the lower ball joint 28, the lower ball joint 28 forms a downwardly recessed spherical groove, the spherical groove is provided with a number of sliding ball holes, the sliding ball holes are provided with a number of sliding balls 29, the sliding balls 29 are made of resin material, the spherical groove and the sliding balls 29 are coated with lubricating oil; then the formwork is erected and concrete is poured, the lower part of the lower ball joint 28 and the annular guide rail 6 is sealed with concrete, exposing the spherical groove and the upper end face of the annular guide rail 6; then the support slide 9 is installed on the annular guide rail 6, the upper ball joint 30 is installed on the lower ball joint 28, the connecting block 31 is installed on the upper ball joint 30, the lower ball joint 28 and the upper ball joint 30 are in rotational contact; finally, the hydraulic traction machine 7 and the rotation traction rope are installed on the concrete structure after the pouring is completed, the two ends of the rotation traction rope are connected to the hydraulic traction machine 7 and the connecting block 31 respectively;

[0042] S3, construct the left pier 1 / right pier 2 on the upper ball joint 30, then install the vibration damping support 20 and the first jack 21 on the right pier 2, install the vibration damping support 20 on the left pier 1, and then construct the left beam 14 and the right beam 15; the lower end of the left pier 1 / right pier 2 is connected not only to the upper ball joint 30 but also to the support slide 9;

[0043] S4, install the steel closure unit, and install the left built-in rail 25, the right built-in rail 24, the left support steel pipe 22 and the right support steel pipe 23 inside the left beam 14 and the right beam 15;

[0044] S5, the bridge is rotated and closed. The hydraulic traction machine 7 is started. The hydraulic traction machine 7 pulls the rotation traction rope, which drives the connecting block 31 to rotate. The connecting block 31 drives the upper ball joint 30 to rotate. The upper ball joint 30 drives the left pier 1 / right pier 2 and the left beam 14 / right beam 15 to rotate. After the rotation is completed, the space under the left pier 1 / right pier 2 is filled with concrete to form a whole. The hydraulic traction machine 7 can be removed in advance.

[0045] S6, bridge connection, start the first jack 21, the first jack 21 drives the right pier 2 to move downward, the left connection part 10 and the right connection part 11 connect, and then install bolts to fix it;

[0046] S7. Install a hydraulic winder 12 on the ground. Install closure traction ropes 13 on the hydraulic winder 12. One closure traction rope 13 enters from the left beam 14 and connects to the right support steel pipe 23. The other closure traction rope 13 enters from the right beam 15 and connects to the left support steel pipe 22. After starting the hydraulic winder 12, the closure traction ropes 13 drive the left support steel pipe 22 to move into the right internal track 24, and the right support steel pipe 23 to move into the left internal track 25. Then, support rectangular ring-shaped templates in the left beam 14 and right beam 15. The templates surround the left support steel pipe 22 and right support steel pipe 23. Then, pour concrete into them to form a rectangular ring-shaped steel pipe concrete structure to fix the connection between the left beam 14 and right beam 15.

[0047] In this embodiment, a borehole drill, a pile cap 3, and a foundation base 5 are used to construct the load-bearing foundation at the bottom of the pier, resulting in a stable structure with strong load-bearing capacity. The rotation unit in this design is located on the foundation base 5. The foundation base 5 has a large area, allowing for the installation of large equipment to increase the maximum load-bearing capacity during rotation, enabling simultaneous rotation of the beam and the pier. This design employs a hydraulic traction machine 7, an upper ball joint 30, and a lower ball joint 28, along with a supporting slide 9. The upper ball joint 30 and lower ball joint 28 facilitate rotation, and the spherical surface provides good load-bearing capacity and better rotational performance. The supporting slide 9 enhances stability and provides a support point. In this design, the right beam 15 can move up and down via the first jack 21, preventing collisions between the left beam 14 and the right beam 15 during rotation. Furthermore, when the right beam 15 moves downwards, it can seamlessly connect with the left beam 14. To enhance the stability of the bridge's closure joint, this design also includes a steel closure unit. This unit contains several left supporting steel pipes 22 and right supporting steel pipes 23, which can be inserted into each other's corresponding left and right internal tracks 25 and 24 for secure connection. To further improve closure stability, this design allows for the left supporting steel pipes 22, right supporting steel pipes 23, left internal track 25, and right internal track 24 within the steel closure unit to be cast into a trapezoidal ring shape.

[0048] The above descriptions are merely embodiments of the present invention, and common knowledge regarding the specific structures and characteristics of the methods is not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or its practicality.

Claims

1. A bridge closure structure, characterized in that: The structure includes a left pier, a right pier, a left beam, a right beam, and a steel closure unit. Both the left and right piers have rotating units at their bottoms, vibration damping supports on both sides, and a first jack on the right pier. The right beam rests on the vibration damping supports and the first jack, while the left beam rests on the vibration damping supports of the left pier. The left beam has a steel left connecting section with several T-shaped first and second connecting slots vertically arranged on it. The first connecting slots are located at the upper part of the left connecting section, and the second connecting slots are located at the lower part. The first connecting slot is larger than the second connecting slot. The right beam has a right connecting section with several T-shaped first and second connecting plates. The first connecting plates can mate with the first connecting slots, and the second connecting plates can mate with the second connecting slots. The steel closure unit includes a hydraulic winder, a left internal track, a right internal track, and a closure traction rope. The left internal track is circumferentially... The left and right internal tracks are arranged circumferentially within the inner wall of the left beam. Left support steel pipes are installed in the left internal tracks, and the ends of all left support steel pipes furthest from the right beam are fixedly connected via a left ring frame. Right support steel pipes are installed in the right internal tracks, and the ends of all right support steel pipes furthest from the left beam are fixedly connected via a right ring frame. A hydraulic winder is located on the ground, and the closure traction rope is wound around the hydraulic winder, allowing the closure traction rope to enter both the left and right beams. The left and right support steel pipes are pulled to move towards each other; both the left and right internal tracks include C-shaped track rings, which are arranged circumferentially along the inner wall of the left / right beam and along the length direction. The number and position of the track rings in the left / right beam are the same. The number and position of the left / right support steel pipes in the left / right beam are the same and staggered. After the left support steel pipe moves, it can be inserted into the track ring of the right beam, and after the right support steel pipe moves, it can be inserted into the track ring of the left beam.

2. The bridge closure structure according to claim 1, characterized in that: The left support steel pipe, the right support steel pipe, and the track ring are all provided with screw holes, into which bolts can be screwed to fix them.

3. The bridge closure structure according to claim 2, characterized in that: Several injection holes are provided on the left and right support steel pipes.

4. The bridge closure structure according to claim 3, characterized in that: A counterweight water tank is installed on both the left and right beams. The counterweight water tank is located at the lower end of the side opposite to the left and right beams, and a solenoid valve is installed at the bottom of the counterweight water tank.

5. The bridge closure structure according to claim 4, characterized in that: The rotating unit includes a base, an upper ball joint, a lower ball joint, connecting blocks, a rotating traction rope, and a hydraulic traction machine. The base is set on the ground, and a spherical groove is opened at the upper end of the base. The lower ball joint is set in the spherical groove, and the upper ball joint is fixedly set at the upper end of the lower ball joint. The upper ball joint is connected to the bottom of the left pier / right pier. The upper ball joint is provided with several connecting blocks. The two ends of the rotating traction rope are respectively connected to the hydraulic traction machine and the connecting blocks. The hydraulic traction machine pulls the rotating traction rope, and the rotating traction rope in turn pulls the upper and lower ball joints to rotate.

6. The construction method for the bridge closure structure according to claim 5, characterized in that, Includes the following steps: S1, Drilled pile and pile cap construction: 9 drilled piles with a diameter of 1-2m and a length of 25-35m are constructed and arranged in a square array under the pile cap; the pile cap is constructed by casting using the sinking pile cap construction method. S2, Arrange the rotating unit, pour a foundation on the pier, install an annular guide rail and a lower ball joint on the foundation, set several sliding ball holes in the spherical groove of the lower ball joint, and set several sliding balls in the sliding ball holes. The sliding balls are made of resin material, and the spherical groove is coated with lubricating oil; then set the formwork and pour concrete, seal the lower part of the lower ball joint and the annular guide rail with concrete, exposing the upper end face of the spherical groove and the annular guide rail; then install the upper ball joint, install the connecting block on the upper ball joint, and the lower ball joint rotates in contact with the upper ball joint; finally install the hydraulic traction machine and the rotating traction rope. S3, build the left pier / right pier on the upper ball joint, then install the vibration damping bearing and the first jack on the right pier, install the vibration damping bearing on the left pier, and then build the left beam and the right beam; S4, install the steel closure unit, and install the left built-in track, right built-in track, left support steel pipe and right support steel pipe inside the left beam and right beam; S5, bridge rotation and closure, start hydraulic traction machine, hydraulic traction machine pulls rotation traction rope, rotation traction rope drives the connecting block to rotate, connecting block drives the upper ball joint to rotate, upper ball joint drives the left pier / right pier and left beam / right beam to rotate; S6, Bridge docking: Activate the first jack, which moves the right pier downwards, allowing the left and right docking sections to connect. Then, install bolts to secure the connection. S7. Install a hydraulic winder on the ground, and install closure traction ropes on the hydraulic winder. One closure traction rope enters from the left beam and connects to the right support steel pipe, while the other closure traction rope enters from the right beam and connects to the left support steel pipe. After starting the hydraulic winder, the closure traction ropes drive the left support steel pipe to move into the right internal track, and the right support steel pipe to move into the left internal track. Then, support rectangular ring-shaped templates in the left and right beams. The templates surround the left and right support steel pipes, and then pour concrete into them to form a rectangular ring-shaped steel pipe concrete structure to fix the connection between the left and right beams.

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