Muller expansion joint structure and method of installing same

Abstract

The application discloses a Moller expansion joint structure and a mounting method thereof and belongs to the technical field of bridge engineering, which comprises two edge longitudinal beams, a plurality of middle longitudinal beams and steel cross beams arranged in the bridge direction, the steel cross beams are arranged at the lower parts of the two edge longitudinal beams and the plurality of middle longitudinal beams; the two edge longitudinal beams are respectively arranged at the end faces of the first main beam and the second main beam in a head-to-tail mode, the plurality of middle longitudinal beams are arranged at intervals between the two edge longitudinal beams, the bottom parts of the plurality of middle longitudinal beams are respectively provided with longitudinal beam support frames, the longitudinal beam support frames are slidably arranged on the steel cross beams, one end of the steel cross beam is fixed at the end face of the first main beam through a fixed end supporting module, the other end of the steel cross beam is slidably arranged at the end face of the second main beam through a sliding end supporting module; the upper parts of the plurality of middle longitudinal beams are sealingly connected through steel wire rubber belts, and the middle parts of the plurality of middle longitudinal beams are horizontally positioned and connected through X-shaped positioning structures. The application can realize the structural stability of the bridge end joint.

Description

Technical Field

[0001] This invention relates to the field of bridge engineering technology, specifically to a Maurer expansion joint structure and its installation method. Background Technology

[0002] Expansion joints, as key auxiliary structures in bridge engineering, play a crucial role in accommodating beam end displacement and ensuring smooth traffic flow. Under the influence of temperature changes, vehicle loads, and wind loads, bridge beam ends experience longitudinal, lateral, and vertical displacements. Expansion joint structures must maintain structural stability and traffic safety under these complex conditions. Currently, modular Maurer expansion joint structures are widely used in highway and municipal bridges because they can adapt to different expansion requirements by increasing or decreasing the number of longitudinal beams. However, because expansion joint structures are constantly exposed to the natural environment and directly bear the vertical pressure, horizontal braking force, and impact loads from vehicle wheels, they become vulnerable parts of bridges. Failure of expansion joint structures not only affects traffic safety but also exacerbates damage to the main bridge structure.

[0003] Traditional expansion joint structures mainly consist of side longitudinal beams, central longitudinal beams, steel crossbeams, displacement control springs, and rubber sealing strips. They suffer from the following main problems during use: Unreasonable stress on the longitudinal beams makes the support system vulnerable to damage. In particular, the uneven changes in the beam gaps between the side longitudinal beams and the longitudinal beams, and between the longitudinal beams themselves, can easily lead to displacement control failure. The bottom support uses surface contact sliding friction, but due to installation errors of multiple longitudinal beams, it is difficult to achieve ideal coplanarity. Uneven frictional resistance hinders free sliding in the longitudinal direction. Furthermore, the stiffness of the bottom column rubber shear elastomer degrades after aging, resulting in poor sliding of the longitudinal beams and uneven gap widths, which makes the rubber sealing strips easy to fall off and cause structural damage. As the core component that directly bears the wheel load, the traditional design places the displacement control spring at the bottom of the beam, leaving the top free and unrestrained. When the vehicle brakes, the longitudinal beam is subjected to asymmetrical push, bending and torsion combined action, which easily produces lateral bending and torsional deformation. The wheel load is unevenly distributed along the length of the longitudinal beam, and the bottom support system is unable to effectively resist the eccentric bending moment, resulting in cracking of the support frame welds. Meanwhile, vehicle impact loads can amplify damage to expansion joint structures, and existing technologies rely on rubber elastomers for buffering, but lack an active buffering mechanism. The impact load is directly transmitted to the beam ends, further increasing the damage to the expansion joint structure.

[0004] In addition, the existing expansion joint structure has insufficient waterproof sealing and durability. The traditional bird-shaped rubber sealing strip is directly inserted into the steel longitudinal beam cavity. The rubber strip has no skeleton reinforcement, and it is easy to fall off after mud and sand intrusion, resulting in sealing failure. Moreover, the debris accumulates in the V-shaped groove, which requires frequent manual cleaning and has high maintenance costs. Summary of the Invention

[0005] To address the problems existing in the prior art, this invention provides a Maurer expansion joint structure and its installation method. The roller system eliminates sliding friction and wear, the steel wire rubber strip skeleton resists mud and sand erosion, the X-shaped positioning structure suppresses the lateral bending and torsional deformation of the longitudinal beam, reducing the risk of sudden failure, and the counter-pressure arc surface rubber plate and the limiting block form multiple constraints to ensure the structural integrity under extreme loads.

[0006] The technical solution of the present invention is as follows: In a first aspect of the invention, a Maurer expansion joint structure is provided, comprising two side longitudinal beams, a plurality of middle longitudinal beams, and a steel crossbeam arranged in the longitudinal direction of the bridge, wherein the steel crossbeam is disposed at the lower part of the two side longitudinal beams and the plurality of middle longitudinal beams. The two side longitudinal beams are respectively located at the end faces of the first main beam and the second main beam, which are opposite each other. The plurality of middle longitudinal beams are arranged between the two side longitudinal beams at a certain distance. The bottom of each of the plurality of middle longitudinal beams is provided with a longitudinal beam support frame. The longitudinal beam support frame is slidably sleeved on the steel crossbeam. One end of the steel crossbeam is fixed to the end face of the first main beam through a fixed end support module. The other end of the steel crossbeam is slidably installed on the end face of the second main beam through a sliding end support module. The upper parts of the plurality of middle longitudinal beams are sealed and connected by steel wire rubber strips. The middle parts of the plurality of middle longitudinal beams are provided with an X-shaped positioning structure for horizontal positioning connection. In some embodiments of the present invention, the two side longitudinal beams are respectively fixed at the end faces of the first main beam and the second main beam that are opposite to each other; the fixed end support module is fixed at the end face of the first main beam, and the sliding end support module is fixed at the end face of the second main beam. In some embodiments of the present invention, a first groove structure is provided at the end face of the first main beam, and a second groove structure is provided at the end face of the second main beam, with both ends of the steel crossbeam respectively disposed in the first groove structure and the second groove structure. In some embodiments of the present invention, a plate-type rubber support is provided between the lower part of one end of the steel crossbeam and the inner wall of the first groove structure, a first limiting block is provided at the upper part of one end of the steel crossbeam and a second limiting block is provided inside the first groove structure, and the first limiting block and the second limiting block are engaged. In some embodiments of the present invention, a PTFE sliding plate is provided between the lower part of one end of the steel crossbeam and the inner wall of the second groove structure, and a counter-pressure arc surface rubber plate is provided between the upper part of one end of the steel crossbeam and the inner wall of the second groove structure. The counter-pressure arc surface rubber plate is connected to the upper inner wall of the second groove structure by bolts. In some embodiments of the present invention, the longitudinal beam support frame includes a frame body sleeved on the outside of the steel crossbeam, the frame body is arranged in a U-shape, and an arc-shaped rubber plate is provided between the bottom of the steel crossbeam and the inner wall of the frame body. The bottom of the longitudinal beam is provided with two blocks along the bridge direction, and several rollers are provided between the two blocks to allow the longitudinal beam to slide along the bridge direction on the steel crossbeam. The several rollers abut against the top of the steel crossbeam inside the frame. In some embodiments of the present invention, the bottom of the longitudinal beam is provided with several arc-shaped groove structures for mounting rollers. In some embodiments of the present invention, the X-shaped positioning structure includes four Z-shaped steel plates and two arc-shaped perforated plates. The two arc-shaped perforated plates are symmetrically connected to form a connecting structure with an elliptical cavity in the middle. The two ends of the connecting structure formed by the two arc-shaped perforated plates are symmetrically connected to Z-shaped steel plates to form an X-shaped connecting structure. In some embodiments of the present invention, the included angle between two adjacent Z-shaped steel plates at one end of the arc-shaped perforated plate is set between 20 degrees and 25 degrees; the arc-shaped perforated plate is configured as a curved ribbed rubber plate. In a second aspect of the invention, a method for installing a Maurer expansion joint structure is provided, comprising: For concrete main beams, slots can be pre-reserved at the ends of the concrete main beams on the construction site, and fixed end support modules and sliding end support modules can be installed first. Then, the side longitudinal beams can be installed. Finally, epoxy resin can be used to attach the PTFE sliding plate to the top surface of the bottom plate of the open steel box of the sliding end support module. For the steel main beam, the fixed end support module and the sliding end support module can be pre-installed in the factory, then the side longitudinal beams can be installed, and then the PTFE sliding plate can be glued to the top surface of the bottom plate of the open steel box of the sliding end support module using epoxy resin. After distinguishing the sliding end and fixed end of the steel beam on site, it is hoisted and a plate rubber support is inserted into the top surface of the bottom plate of the open steel box of the fixed end support module. The corresponding part of the bottom surface of the top plate of the open steel box of the sliding end support module is installed with a counter-pressure arc rubber plate and the counter-pressure arc rubber plate is fixed with screws. Install the longitudinal beam and the longitudinal beam support frame, place the roller at the bottom of the longitudinal beam, and then install the stop blocks on both sides of the bottom of the longitudinal beam. Insert the arc-shaped rubber plate between the bottom surface of the steel crossbeam and the frame to form a counter pressure on the roller, ensuring rolling contact between the bottom surface of the longitudinal beam and the top surface of the steel crossbeam, and preventing the longitudinal beam from bouncing and the roller from slipping out. Install X-shaped positioning structures between the side longitudinal beams and the middle longitudinal beams, and between the middle longitudinal beams to complete the horizontal positioning of the middle longitudinal beams. Continue to embed the steel wire rubber strips one by one between the side longitudinal beams and the middle longitudinal beams, and between the middle longitudinal beams to complete the installation.

[0007] One or more technical solutions of the present invention have the following beneficial effects: The present invention provides a Maurer expansion joint structure and its installation method. The steel crossbeam serves as the core load-bearing skeleton, which evenly transfers the vertical load of the side longitudinal beams and the middle longitudinal beam to the ends of the first and second main beams, significantly reducing stress concentration. The sliding sleeve design of the middle longitudinal beam support frame and the steel crossbeam, in conjunction with the rollers, transforms sliding friction into rolling friction, ensuring that the middle longitudinal beam can slide freely in the bridge direction, eliminating the jamming caused by traditional surface contact. The entire system is reasonably stressed, the beam joint changes are uniform, and the structure is stable.

[0008] The X-shaped positioning structure uses four Z-shaped steel plates to form an X-shaped stable frame, which constrains the horizontal displacement of the longitudinal beam and ensures the uniformity of the joint width. Its arc-shaped perforated plate adapts to dynamic loads through elastic deformation and dissipates impact energy synchronously. The counter-pressure arc-shaped rubber plate and the limiting block form a multi-constraint mechanism to suppress the bouncing and torsion of the longitudinal beam and improve its resistance to braking impact.

[0009] The steel wire rubber strip enhances the sealing performance with a steel wire mesh skeleton. After being embedded in the upper flange of the longitudinal beam, it forms an arc-shaped cross section, which not only prevents sewage and debris from entering the bridge deck, but also provides lateral elastic support for the middle longitudinal beam, greatly extending the service life of the waterproof system, and eliminating the need for manual cleaning of the gaps; the PTFE sliding plate forms an ultra-low friction interface at the sliding end, reducing support wear; the plate rubber bearing absorbs vibration at the fixed end, reducing the load transmission to the main beam.

[0010] The first main beam has a pre-set first groove structure on its end face, and the second main beam has a pre-set second groove structure on its end face to simplify the positioning of the steel crossbeam. The concrete and steel main beams are installed in different scenarios to adapt to different construction conditions. The replaceable PTFE sliding plate, curved rubber plate and steel wire rubber strip are embedded in an open manner, which significantly reduces the difficulty and cost of later maintenance. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structural usage state of a Maurer expansion joint structure provided in Embodiment 1 of the present invention; Figure 2 This is a top view of the X-shaped positioning structure provided in Embodiment 1 of the present invention; Figure 3 This is a front view schematic diagram of the X-shaped positioning structure provided in Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of the transverse structure of the longitudinal beam support frame provided in Embodiment 1 of the present invention; Figure 5 This is a schematic diagram of the longitudinal beam support frame in the longitudinal direction of the bridge provided in Embodiment 1 of the present invention.

[0012] In the diagram: 1. Side longitudinal beam; 2. Middle longitudinal beam; 3. X-shaped positioning structure; 31. Z-shaped steel plate; 32. Perforated plate; 33. Connecting bolt; 4. Steel wire rubber strip; 5. Middle longitudinal beam support frame; 51. Frame body; 52. Roller; 53. Stop block; 54. First screw; 55. Curved rubber plate; 56. Second screw; 6. Steel crossbeam; 7. Fixed end support module; 8. Sliding end support module; 9. Plate rubber bearing; 10. Limiting block; 11. PTFE sliding plate; 12. Counter-pressure curved rubber plate; 13. Bridge deck pavement; 14. First main beam; 15. Second main beam. Detailed Implementation

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0014] Example 1 In a typical embodiment of the present invention, such as Figures 1 to 5 As shown, a Maurer expansion joint structure is proposed, including two side longitudinal beams 1, several middle longitudinal beams 2, and a steel crossbeam 6 arranged along the bridge direction. The steel crossbeam 6 is arranged at the lower part of the two side longitudinal beams 1 and several middle longitudinal beams 2. The two side longitudinal beams 1 are respectively located at the end faces of the first main beam 14 and the second main beam 15, which are opposite each other. The plurality of middle longitudinal beams 2 are arranged between the two side longitudinal beams 1 at a certain distance. The bottom of the plurality of middle longitudinal beams 2 is provided with a longitudinal beam support frame. The longitudinal beam support frame is slidably sleeved on the steel crossbeam 6. One end of the steel crossbeam 6 is fixed at the end face of the first main beam 14 by a fixed end support module 7. The other end of the steel crossbeam 6 is slidably installed at the end face of the second main beam 15 by a sliding end support module 8. The upper parts of the plurality of middle longitudinal beams 2 are sealed together by a steel wire rubber strip 4. The middle parts of the plurality of middle longitudinal beams 2 are provided with an X-shaped positioning structure 3 for horizontal positioning connection. The steel crossbeam 6 serves as the overall load-bearing frame, uniformly transferring the vertical loads of the side longitudinal beams 1 and the middle longitudinal beam 2 to the ends of the main beam, significantly reducing local stress concentration. The sliding sleeve design of the middle longitudinal beam support frame 5 and the steel crossbeam 6 allows the middle longitudinal beam 2 to slide freely along the bridge direction, avoiding the jamming phenomenon caused by traditional surface contact friction. The upper steel wire rubber strip 4 provides sealing and lateral elastic support, buffering vehicle impacts. The central X-shaped positioning structure 3 constrains horizontal displacement, ensuring uniform joint width. The number of middle longitudinal beams 2 can be increased or decreased as needed to adapt to different expansion and contraction requirements, improving the versatility of the project.

[0015] In this embodiment, the top surfaces of the side longitudinal beam 1 and the middle longitudinal beam 2 are flush with the top surface of the bridge deck pavement 13, the right side is the first main beam 14, and the left side is the second main beam 15.

[0016] In some embodiments of the present invention, the two side longitudinal beams 1 are respectively fixed at the end faces of the first main beam 14 and the second main beam 15 facing each other; the fixed end support module 7 is fixed at the end face of the first main beam 14, and the sliding end support module 8 is fixed at the end face of the second main beam 15. The side longitudinal beam 1 is directly anchored to the end face of the main beam, forming a rigid boundary constraint to prevent the overall lateral drift of the expansion joint; the fixed end support module 7 and the sliding end support module 8 are respectively located at the ends of the first main beam 14 and the second main beam 15, clearly distinguishing the static load transfer zone and the dynamic load displacement zone, reducing the internal force disorder of the support system.

[0017] In some embodiments of the present invention, the first main beam 14 is provided with a first groove structure at its end face, the second main beam 15 is provided with a second groove structure at its end face, and the two ends of the steel crossbeam 6 are respectively disposed in the first groove structure and the second groove structure. To improve installation accuracy, a pre-formed groove structure is used on the end face of the main beam to provide a standardized positioning benchmark for the steel crossbeam 6, reducing the difficulty of on-site leveling; the contact area between the inner wall of the groove and the support module is increased to avoid stress concentration and cracking in the concrete anchorage area.

[0018] In some embodiments of the present invention, a plate-type rubber support 9 is provided between the lower part of one end of the steel beam 6 and the inner wall of the first groove structure, a first limiting block 10 is provided at the upper part of one end of the steel beam 6 and a second limiting block 10 is provided inside the first groove structure, and the first limiting block 10 and the second limiting block 10 are engaged. The plate rubber bearing 9 absorbs vertical vibration and reduces the transmission of impact load to the main beam; the first limiting block 10 and the second limiting block 10 are engaged to restrict the lateral displacement and torsion of the steel crossbeam 6.

[0019] In some embodiments of the present invention, a PTFE sliding plate 11 is provided between the lower part of one end of the steel beam 6 and the inner wall of the second groove structure, and a counter-pressure arc surface rubber plate 12 is provided between the upper part of one end of the steel beam 6 and the inner wall of the second groove structure. The counter-pressure arc surface rubber plate 12 is connected to the upper inner wall of the second groove structure by bolts. The PTFE sliding plate 11 provides an ultra-low friction interface, ensuring free sliding along the bridge direction under temperature deformation; the counter-pressure arc rubber plate 12 adaptively presses against the top surface of the steel crossbeam 6 to prevent vibration and compensate for installation errors; improving durability, the bolt-fixed counter-pressure arc rubber plate 12 is easy to replace and extends the maintenance cycle of the sliding end.

[0020] In some embodiments of the present invention, the longitudinal beam support frame includes a frame body 51 sleeved on the outside of the steel crossbeam 6. The frame body 51 is arranged in a U-shape, and an arc-shaped rubber plate 55 is provided between the bottom of the steel crossbeam 6 and the inner wall of the frame body 51. The bottom of the longitudinal beam 2 is provided with two blocks 53 along the bridge direction, and a number of rollers 52 are provided between the two blocks 53 to allow the longitudinal beam 2 to slide along the bridge direction on the steel crossbeam 6. The number of rollers 52 abut against the top of the steel crossbeam 6 inside the frame 51. In this embodiment, the two stops 53 are connected to the central longitudinal beam 2 by the first screw 54; the arc-shaped rubber plate 55 is connected to the frame 51 by the second screw 56.

[0021] The roller 52 converts sliding friction into rolling friction, reducing the sliding resistance of the middle longitudinal beam 2; the U-shaped frame 51 wraps around the steel crossbeam 6 to prevent local jamming caused by the misalignment of the roller 52; the arc-shaped rubber plate 55 fills the gap between the frame 51 and the steel crossbeam 6 to absorb the impact energy of the vehicle; the stop block 53 constrains the stroke of the roller 52 to prevent the middle longitudinal beam 2 from becoming unstable after separation.

[0022] In some embodiments of the present invention, the bottom of the longitudinal beam 2 is provided with several arc-shaped groove structures for mounting rollers 52. The arc-shaped groove fits the curved surface of the roller 52, increasing the contact area and dispersing the wheel load pressure; it also enhances the resistance to eccentric loads. The sidewall of the groove restricts the lateral displacement of the roller 52, preventing the longitudinal beam 2 from twisting under braking load.

[0023] In some embodiments of the present invention, the X-shaped positioning structure 3 includes four Z-shaped steel plates 31 and two arc-shaped perforated plates 32. The two arc-shaped perforated plates 32 are symmetrically connected to form a connection structure with an elliptical cavity in the middle. The two ends of the connection structure formed by the two arc-shaped perforated plates 32 are symmetrically connected to the Z-shaped steel plates 31 to form an X-shaped connection structure. In this embodiment, four Z-shaped steel plates 31 and two arc-shaped perforated plates 32 are connected by connecting bolts 33. The four Z-shaped steel plates 31 form an X-shaped stable frame to resist lateral shear deformation; the arc-shaped perforated plates 32 elastically deform to adapt to changes in the gap width and maintain a constant preload; the elliptical cavity generates micro-deformation under dynamic load to dissipate impact kinetic energy.

[0024] In some embodiments of the present invention, the included angle between two adjacent Z-shaped steel plates 31 at one end of the arc-shaped perforated plate 32 is set between 20 degrees and 25 degrees; the arc-shaped perforated plate 32 is configured as a curved ribbed rubber plate. like Figure 2 As shown, the included angle between the Z-shaped steel plates 31 is A. The angle of included angle A is set between 20 degrees and 25 degrees, which can balance the horizontal stiffness and deformation adaptability. The curved ribbed rubber plate is reinforced with steel wire mesh to enhance the tensile strength and avoid the tearing defect of pure rubber.

[0025] In a second aspect of the invention, a method for installing a Maurer expansion joint structure is provided, comprising: For concrete main beams, slots can be pre-reserved at the ends of the concrete main beams on the construction site, and fixed end support modules 7 and sliding end support modules 8 can be installed first. Then, side longitudinal beams 1 can be installed. Finally, epoxy resin can be used to attach PTFE sliding plates 11 to the top surface of the bottom plate of the open steel box of the sliding end support module 8. For the steel main beam, the fixed end support module 7 and the sliding end support module 8 can be pre-installed in the factory, then the side longitudinal beam 1 can be installed, and then the PTFE sliding plate 11 can be glued to the top surface of the bottom plate of the open steel box of the sliding end support module 8 using epoxy resin. After distinguishing the sliding end and fixed end of the steel beam 6 on site, it is hoisted and a plate rubber support 9 is inserted into the top surface of the bottom plate of the open steel box of the fixed end support module 7. The corresponding part of the bottom surface of the top plate of the open steel box of the sliding end support module 8 is installed with a counter-pressure arc surface rubber plate 12, and the counter-pressure arc surface rubber plate 12 is fixed with screws. Install the longitudinal beam 2 and the longitudinal beam support frame. Place the roller 52 at the bottom of the longitudinal beam 2 and then install the stop block 53 on both sides of the bottom of the longitudinal beam 2. Insert the arc-shaped rubber plate 55 between the bottom surface of the steel crossbeam 6 and the frame 51 to form a counter pressure on the roller 52, ensuring the rolling contact between the bottom surface of the longitudinal beam 2 and the top surface of the steel crossbeam 6, and preventing the longitudinal beam 2 from bouncing and the roller 52 from slipping out. Install X-shaped positioning structures between the side longitudinal beam 1 and the middle longitudinal beam 2, and between the middle longitudinal beam 2 and the middle longitudinal beam 2 to complete the horizontal positioning of the middle longitudinal beam 2. Continue to embed the steel wire rubber strips 4 one by one between the side longitudinal beam 1 and the middle longitudinal beam 2, and between the middle longitudinal beam 2 and the middle longitudinal beam 2 to complete the installation.

[0026] The concrete main beam has pre-reserved grooves on site to match the cast-in-place construction process; the steel main beam is pre-assembled in the factory to improve modular integration; the PTFE sliding plate 11 is bonded with epoxy resin to ensure reliable low-friction interface bonding; the roller 52 and the arc-shaped rubber plate 55 are installed in stages to form a dual support system of rolling and elasticity; the X-shaped positioning structure 3 is installed later to achieve rapid centering of the longitudinal beam 2; the steel wire rubber strip 4 is embedded at the end to avoid damage to the seals during construction.

[0027] The present invention provides a Maurer expansion joint structure and its installation method, in which a steel crossbeam 6 serves as the core load-bearing skeleton, uniformly transferring the vertical load of the side longitudinal beams 1 and the middle longitudinal beam 2 to the end of the main beam, significantly reducing stress concentration. The sliding sleeve design of the middle longitudinal beam support frame 5 and the steel crossbeam 6, together with the roller 52 system, converts sliding friction into rolling friction, ensuring that the middle longitudinal beam 2 slides freely in the bridge direction, eliminating the jamming caused by traditional surface contact.

[0028] The X-shaped positioning structure 3 forms a rhomboid stable frame through four Z-shaped steel plates 31, which constrains the horizontal displacement of the longitudinal beam 2 and ensures the uniformity of the joint width; its arc-shaped perforated plate 32 elastically deforms to adapt to dynamic loads and simultaneously dissipates impact energy; the counter-pressure arc-shaped rubber plate 12 and the limiting block 10 form a multi-constraint mechanism to suppress the bouncing and torsion of the longitudinal beam 2 and improve its resistance to braking impact.

[0029] The steel wire rubber strip 4 enhances the sealing performance with a steel wire mesh skeleton. After being embedded in the upper flange of the longitudinal beam, it forms an arc-shaped cross section, which not only prevents sewage and debris from entering the bridge deck, but also provides lateral elastic support for the middle longitudinal beam 2, greatly extending the service life of the waterproof system. The PTFE sliding plate 11 forms an ultra-low friction interface at the sliding end, reducing support wear. The plate rubber bearing 9 absorbs vibration at the fixed end, reducing the load transmission to the main beam.

[0030] The pre-set groove structure on the end face of the main beam simplifies the positioning of the steel crossbeam 6, and the installation process of concrete and steel main beams is adapted to different construction conditions in different scenarios; the replaceable PTFE sliding plate 11, arc rubber plate 55 and steel wire rubber strip 4 are embedded in an open manner, which significantly reduces the difficulty and cost of later maintenance.

[0031] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A Maurer expansion joint structure, characterized in that, It includes two side longitudinal beams, several middle longitudinal beams, and steel crossbeams arranged along the bridge direction, wherein the steel crossbeams are arranged at the lower part of the two side longitudinal beams and several middle longitudinal beams; The two side longitudinal beams are respectively located at the end faces of the first main beam and the second main beam, which are opposite each other. The plurality of middle longitudinal beams are arranged between the two side longitudinal beams at a certain distance. The bottom of each of the plurality of middle longitudinal beams is provided with a longitudinal beam support frame. The longitudinal beam support frame is slidably sleeved on the steel crossbeam. One end of the steel crossbeam is fixed to the end face of the first main beam through a fixed end support module, and the other end of the steel crossbeam is slidably installed on the end face of the second main beam through a sliding end support module. The upper parts of the plurality of middle longitudinal beams are sealed and connected by steel wire rubber strips, and the middle parts of the plurality of middle longitudinal beams are provided with an X-shaped positioning structure for horizontal positioning connection. The longitudinal beam support frame includes a frame body sleeved on the outside of the steel crossbeam. The frame body is arranged in a U-shape, and an arc-shaped rubber plate is provided between the bottom of the steel crossbeam and the inner wall of the frame body. The bottom of the longitudinal beam is provided with two blocks along the bridge direction, and several rollers are provided between the two blocks to allow the longitudinal beam to slide along the bridge direction on the steel crossbeam. The several rollers abut against the top of the steel crossbeam inside the frame. The X-shaped positioning structure includes four Z-shaped steel plates and two arc-shaped perforated plates. The two arc-shaped perforated plates are symmetrically connected to form a connection structure with an elliptical cavity in the middle. The two ends of the connection structure formed by the two arc-shaped perforated plates are symmetrically connected to Z-shaped steel plates to form an X-shaped connection structure. The included angle between two adjacent Z-shaped steel plates at one end of the arc-shaped perforated plate is set between 20 and 25 degrees; the arc-shaped perforated plate is set as a curved ribbed rubber plate.

2. The Maurer expansion joint structure as described in claim 1, characterized in that, The two side longitudinal beams are respectively fixed at the end faces of the first main beam and the second main beam, which are opposite each other; the fixed end support module is fixed at the end face of the first main beam, and the sliding end support module is fixed at the end face of the second main beam.

3. The Maurer expansion joint structure as described in claim 2, characterized in that, The first main beam has a first groove structure at its end face, and the second main beam has a second groove structure at its end face. The two ends of the steel crossbeam are respectively set in the first groove structure and the second groove structure.

4. The Maurer expansion joint structure as described in claim 3, characterized in that, A plate-type rubber support is provided between the lower part of one end of the steel crossbeam and the inner wall of the first groove structure. A first limiting block is provided at the upper part of one end of the steel crossbeam in the first groove structure. A second limiting block is provided inside the first groove structure. The first limiting block and the second limiting block are engaged.

5. The Maurer expansion joint structure as described in claim 3, characterized in that, A PTFE sliding plate is provided between the lower part of one end of the steel crossbeam and the inner wall of the second groove structure. A counter-pressure arc surface rubber plate is provided between the upper part of one end of the steel crossbeam and the inner wall of the second groove structure. The counter-pressure arc surface rubber plate is connected to the upper inner wall of the second groove structure by bolts.

6. The Maurer expansion joint structure as described in claim 1, characterized in that, The bottom of the longitudinal beam is provided with several arc-shaped groove structures for installing rollers.

7. The installation method of a Maurer expansion joint structure as described in any one of claims 1-6, characterized in that, include: For concrete main beams, at the construction site, slots are first reserved at the ends of the concrete main beams, fixed end support modules and sliding end support modules are installed, then the side longitudinal beams are installed, and then PTFE sliding plates are glued to the top surface of the bottom plate of the open steel box of the sliding end support module using epoxy resin. For the steel main beam, the fixed end support module and the sliding end support module are pre-installed in the factory, then the side longitudinal beams are installed, and then the PTFE sliding plate is glued to the top surface of the bottom plate of the open steel box of the sliding end support module with epoxy resin. After distinguishing the sliding end and fixed end of the steel beam on site, it is hoisted and a plate rubber support is inserted into the top surface of the bottom plate of the open steel box of the fixed end support module. The corresponding part of the bottom surface of the top plate of the open steel box of the sliding end support module is installed with a counter-pressure arc rubber plate and the counter-pressure arc rubber plate is fixed with screws. Install the longitudinal beam and the longitudinal beam support frame, place the roller at the bottom of the longitudinal beam, and then install the stop blocks on both sides of the bottom of the longitudinal beam. Insert the arc-shaped rubber plate between the bottom surface of the steel crossbeam and the frame to form a counter pressure on the roller, ensuring rolling contact between the bottom surface of the longitudinal beam and the top surface of the steel crossbeam, and preventing the longitudinal beam from bouncing and the roller from slipping out. Install X-shaped positioning structures between the side longitudinal beams and the middle longitudinal beams, and between the middle longitudinal beams to complete the horizontal positioning of the middle longitudinal beams. Continue to embed the steel wire rubber strips one by one between the side longitudinal beams and the middle longitudinal beams, and between the middle longitudinal beams to complete the installation.

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