Bridge expansion joint and method of installing same

Abstract

A bridge expansion joint and a method for installing the same, the expansion joint comprising a cross joint plate installed in a first installation slot, a fixing plate installed in a second installation slot, a height adjusting assembly, a lower support assembly, a rotating shaft assembly and an upper pressing seat assembly arranged in the first installation slot, the height adjusting assembly being fixed in the first installation slot, the lower support assembly being fixed with the height adjusting assembly, the rotating shaft assembly being supported on the lower support assembly and arranged along a transverse direction of the bridge, the upper pressing seat assembly being arranged above the lower support assembly and pressing the rotating shaft assembly, and the upper pressing seat assembly being fixed with the height adjusting assembly. The expansion joint is installed without bolts, and the cross joint plate is free of bolt holes, thereby reducing the noise of vehicle passing, eliminating the problem of bolt and nut loosening, and achieving the functions of horizontal rotation and vertical rotation by elastic cooperation among the lower support assembly, the rotating shaft assembly and the upper pressing seat assembly. During installation, the flatness of the expansion joint and the bridge surface is adjusted according to the depth of the slot and the height of the height adjusting assembly, thereby achieving rapid installation.

Description

Technical Field

[0001] This invention relates to bridge expansion joints, and more particularly to a bridge expansion joint and its installation method. Background Technology

[0002] During operation, bridge engineering projects are subject to creep and wind forces caused by vehicle loads, the bridge's own materials, and temperature variations, leading to bridge contraction and expansion deformation. Expansion joints are crucial functional components of bridge engineering, typically installed between bridges and between bridges and abutments to accommodate bridge deformation. For safe and stable vehicle traffic, the expansion joints installed on bridges must accommodate various changes in the beam structure. While conventional comb-plate expansion joints can meet the requirements of beam expansion and contraction, their on-site adjustment and installation are complex and difficult. Furthermore, existing expansion joints use bolted connections with bolt holes on the plate surface, resulting in significant vehicle noise and making it difficult to adjust the flatness between the expansion joint and the bridge surface. Therefore, improvements to existing bridge expansion joints are needed, and correspondingly, the installation methods for existing bridge expansion joints also require further refinement. Summary of the Invention

[0003] The first technical problem to be solved by the present invention is to provide a bridge expansion joint with adjustable height and boltless fastening installation, in light of the above-mentioned existing technology.

[0004] The second technical problem to be solved by the present invention is to provide a convenient and quick installation method for bridge expansion joints, in light of the existing technology described above.

[0005] The technical solution adopted by the present invention to solve the first technical problem mentioned above is as follows: The bridge expansion joint includes a joint plate and a fixing plate that cooperate with each other. The joint plate is installed in a first mounting slot at the end of a first beam, and the fixing plate is installed in a second mounting slot at the end of a second beam. The feature is that a height adjustment component, a lower support component, a rotating shaft component, and an upper pressure seat component are provided in the first mounting slot. The height adjustment component is fixed in the first mounting slot. The lower support component is fixed to the height adjustment component. The rotating shaft component is supported on the lower support component and arranged along the transverse direction of the bridge. The upper pressure seat component is located above the lower support component and presses against the rotating shaft component. Furthermore, the upper pressure seat component is fixed to the height adjustment component. Thus, the joint plate and the fixing plate achieve a boltless fastening installation structure.

[0006] Further preferably, the lower support assembly has a vertically arranged lower positioning hole, and the upper pressure seat assembly has a vertically arranged upper positioning hole. The upper positioning hole and the lower positioning hole correspond one-to-one. A detachable adjusting fastener passes through the upper positioning hole and the corresponding lower positioning hole from top to bottom to adjust the installation position of the lower support assembly, the upper pressure seat assembly and the cross joint plate.

[0007] The lower support assembly and the upper support assembly can have various different structures. Preferably, the lower support assembly includes a support rib and a lower support supported on the support rib. The upper pressure seat assembly includes an L-shaped buckle plate. The rotating shaft assembly includes a rotating shaft fixed to the bottom of the cross joint plate. The top of the L-shaped buckle plate is fastened to the lower support and hugs the rotating shaft. The outer side wall of the L-shaped buckle plate is fixed to the height adjustment assembly. The lower positioning hole is provided on the lower support, and the upper positioning hole is provided on the top of the L-shaped buckle plate.

[0008] As a preferred embodiment, the L-shaped buckle plate includes a first buckle plate and a second buckle plate, with an upper pressure plate sandwiched between the first and second buckle plates to hold the rotating shaft in place. The rotating shaft assembly also includes an elastic pressure plate disposed between the upper pressure plate and the rotating shaft. The elastic pressure plate is typically made of rubber with elastic properties. When the upper pressure plate presses down on the rotating shaft, the deformation of the rubber plate compresses the rotating shaft, allowing the cross-joint plate to rotate relative to the lower support assembly and the upper pressure plate assembly via the rotating shaft.

[0009] As another preferred embodiment, the L-shaped buckle plate is a single piece, and the pivot assembly further includes an elastic pressure plate disposed between the top of the L-shaped buckle plate and the pivot. Similarly, the elastic pressure plate facilitates the rotation of the cross-joint plate through the lower support assembly and the upper pressure seat assembly of the pivot.

[0010] The height adjustment component can have various structures. In this case, it is a height adjustment plate located on the outside of the supporting rib, lower support, and L-shaped buckle. The inner side of the height adjustment plate has a stepped portion, and the outer wall of the L-shaped buckle is supported on this stepped portion. The supporting rib and lower support are connected and fixed to the height adjustment plate and the outer wall of the L-shaped buckle via connecting plates. Thus, the height of the L-shaped buckle can be directly adjusted via the height adjustment plate, and the height of the lower support assembly can be indirectly adjusted via the connecting piece, ultimately adjusting the seam panel to the required flatness.

[0011] In order to fix the height adjustment component to the bottom of the first mounting slot, a first embedded steel plate is installed at the bottom of the first mounting slot, and the bottom of the height adjustment component is welded and fixed to the first embedded steel plate.

[0012] The height adjustment component can also adopt other structures. Preferably, the height adjustment component is an L-shaped connecting plate, and the lower support component and the upper pressure seat component are welded and fixed on the L-shaped connecting plate.

[0013] To facilitate the lateral rotation and vertical angle turning functions of the telescopic device, an elastic fastening component is also installed at the bottom of the cross joint plate. Along the longitudinal direction of the bridge, the elastic fastening component is located on the front side of the lower support assembly and is fixed to the bottom of the first mounting slot or fixed to the lower support assembly.

[0014] As a preferred embodiment, the elastic fastening assembly includes a housing, a bolt, and an elastic body. The bottom of the housing is fixed to the bottom of the first mounting slot. The bolt is disposed within the housing, with its head extending upwards out of the housing and connected to the bottom of the cross-slot plate. The elastic body is disposed within the housing and fitted onto the bolt. The elastic fastening assembly, using the above structure, has certain horizontal and vertical rotation capabilities. The elastic body can be made of various elastic materials such as springs, rubber, spring sheets, and spring wires.

[0015] As another preferred embodiment, the elastic fastening assembly includes an elastic body, an upper connecting steel bar, a lower connecting steel bar, and a threaded end. The threaded end is located at the top of the elastic body and is connected and fixed to the bottom of the cross joint plate. The upper connecting steel bar is used to connect and fix to the concrete in the first mounting groove, and the lower connecting steel bar is connected and fixed to the lower support assembly.

[0016] To achieve a concrete-free structure, a crash barrier is installed on the outer side of the height adjustment component. The crash barrier can be made of steel plate and its height can be adjusted according to the actual installation size requirements.

[0017] Preferably, the cross-slot plate and the fixing plate are comb-tooth plates that are intersected and spaced apart from each other.

[0018] There are multiple fixing schemes for the fixing plate. As a preferred scheme, a second pre-embedded steel plate is provided at the bottom of the second mounting slot, and the fixing plate is fixed to the second pre-embedded steel plate by a saddle-type support frame.

[0019] As another fixing method for the fixing plate, a shear stud is installed at the bottom of the second mounting slot, and the fixing plate is fastened to the shear stud by an anchoring assembly.

[0020] The technical solution adopted by the present invention to solve the second technical problem mentioned above is: the installation method of the bridge expansion joint, characterized in that the installation method includes the following steps:

[0021] s1. Excavate and clean the entire area of ​​the slot where the expansion joint is installed, and measure the depth of the slot;

[0022] s2. Based on the groove depth measured in s1, the height adjustment component of the telescopic device is processed accordingly, and the height adjustment component is welded to the first embedded steel plate, and the welding slag and weld are cleaned.

[0023] s3. Install the fixing plate and adjust the flatness of the fixing plate with the bridge deck;

[0024] s4. Install the cross joint plate. After adjusting the flatness between the cross joint plate and the fixed plate to meet the requirements, install the lower support assembly, the rotating shaft assembly and the upper pressure seat assembly. After the positions of the lower support assembly and the upper pressure seat assembly are adjusted, fix the lower support assembly and the upper pressure seat assembly to the height adjustment assembly.

[0025] s5. Pour concrete into the first and second installation slots and allow it to cure to complete the installation of the expansion joint.

[0026] To achieve a concrete-free structure, immediately following step s4 and before step s5, a crash barrier is welded and fixed to the outside of the height adjustment component, and the upper surface of the crash barrier is flush with the bridge road surface.

[0027] Further preferably, before step s5, the weld seam and weld slag are cleaned to ensure that the installation slot is clean.

[0028] As a preferred embodiment, in step s4, an adjusting screw is used as the adjusting fastener. The upper positioning hole and the lower positioning hole are screw holes. First, the adjusting screw is used to adjust the lower support assembly, the upper pressure seat assembly and the cross joint plate into place and then tightened. Then, the lower support assembly, the upper pressure seat assembly and the height adjustment assembly are welded and fixed. Finally, the adjusting screw is removed and the screw holes are plugged or sealed with elastic glue.

[0029] As another preferred option, in step s4, the upper pressure seat assembly is leveled using tooling with the cross-joint plate surface as a reference, and the lower support assembly is welded to the inside of the upper pressure seat assembly; then, the upper pressure seat assembly and the height adjustment assembly are welded and fastened together.

[0030] Compared with the prior art, the advantages of this invention are as follows: the bridge expansion joint achieves boltless installation, with no bolt holes on the plate surface, reducing noise from vehicle traffic and eliminating the problem of loose bolts and nuts. Through the elastic cooperation between the lower support assembly, the rotating shaft assembly, and the upper pressure seat assembly, the cross joint plate is fastened, providing an anti-fall-off function, while also achieving horizontal and vertical cornering functions. During installation, the height of the components is adjusted according to the groove depth to improve the flatness between the expansion joint and the bridge road surface, and it is directly welded to the groove steel plate, reducing intermediate steps and thus achieving rapid installation of the expansion joint. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the mounting plane in Embodiment 1 of the present invention. Figure 1 ;

[0032] Figure 2 This is a structural cross-sectional view of Embodiment 1 of the present invention;

[0033] Figure 3 This is a schematic diagram of the saddle-type support frame according to Embodiment 1 of the present invention;

[0034] Figure 4 This is another structural schematic diagram of Embodiment 1 of the present invention;

[0035] Figure 5 This is another structural cross-sectional view of Embodiment 1 of the present invention;

[0036] Figure 6 This is a cross-sectional view of the elastic fastening assembly according to Embodiment 1 of the present invention;

[0037] Figure 7 This is a partial structural diagram of Embodiment 1 of the present invention;

[0038] Figure 8 for Figure 7 Top view of the structure shown;

[0039] Figure 9 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0040] Figure 10 This is a cross-sectional view of the structure of Embodiment 2 of the present invention;

[0041] Figure 11 This is a schematic diagram of the elastic fastening assembly according to Embodiment 2 of the present invention;

[0042] Figure 12 This is a partial structural diagram of Embodiment 2 of the present invention;

[0043] Figure 13 This is a schematic diagram of the rotating shaft assembly according to Embodiment 2 of the present invention. Detailed Implementation

[0044] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Example 1:

[0045] like Figures 1 to 8 As shown, the bridge expansion joint device of this embodiment includes a joint plate 1 and a fixing plate 2 that cooperate with each other. The joint plate 1 and the fixing plate 2 are comb-tooth plates that are intersected and spaced apart from each other. The joint plate 1 is installed in the first mounting slot 31 at the end of the first beam 3, and the fixing plate 2 is installed in the second mounting slot 41 at the end of the second beam 4.

[0046] A height adjustment component 5, a lower support component 6, a rotating shaft component 7, and an upper pressure seat component 8 are provided within the first mounting slot 31. Specifically, the height adjustment component 5 is fixed to the first mounting slot 31. A first embedded steel plate 11 is installed at the bottom of the first mounting slot 31, and the bottom of the height adjustment component 5 is welded and fixed to the first embedded steel plate 11. In this embodiment, the height adjustment component 5 is a height adjustment plate, and the inner side of the height adjustment plate is formed with a stepped portion.

[0047] by Figure 2The direction indicated by arrow A is inward, and the lower support assembly 6 is located on the inner side of the height adjustment plate. In this embodiment, the lower support assembly 6 includes a supporting rib plate 61 and a lower support 62 supported on the supporting rib plate. The supporting rib plate 61 is a triangular rib plate, and the lower support 62 has a vertically arranged lower positioning hole 60. The upper pressure seat assembly 8 includes an L-shaped buckle plate 81, which is located on the inner side of the height adjustment plate. The outer wall of the L-shaped buckle plate 81 is supported on the step portion, and the height position of the L-shaped buckle plate 81 is adjusted by the height adjustment plate. Figure 8 As shown, the L-shaped buckle plate 81 in this embodiment is a split component, comprising a first buckle plate 811 and a second buckle plate 812. An upper pressure plate 82 is sandwiched between the first buckle plate 811 and the second buckle plate 812. Both the first buckle plate 811 and the second buckle plate 812 are steel plates, while the upper pressure plate 82 is made of an elastic material. The elastic material presses the joint plate's pivot shaft tightly. Simultaneously, due to its elasticity, the joint plate can rotate appropriately under certain pressure to meet the vertical rotation requirements of the bridge. The first buckle plate 811, the second buckle plate 812, and the upper pressure plate 82 can be manufactured as a single unit. Vertically positioned upper positioning holes 80 are provided at the top of the first buckle plate 811 and the second buckle plate 812. Detachable adjusting fasteners pass through the upper positioning holes 80 and the corresponding lower positioning holes 60 from top to bottom, allowing adjustment of the installation positions of the lower support assembly 6, the upper pressure assembly 8, and the joint plate 1. In this embodiment, an adjusting screw (not shown in the figure) is used as an adjusting fastener. The upper positioning hole 80 and the lower positioning hole 60 are screw holes. The adjusting screw is used to adjust the lower support assembly 6, the upper pressure seat assembly 8 and the cross joint plate 1 into place and then tightens them.

[0048] The rotating shaft assembly 7 in this embodiment includes a rotating shaft 71 and an elastic pressure plate 72. The rotating shaft 71 is arranged horizontally and fixed to the bottom of the cross joint plate 1. The elastic pressure plate 72 is made of a rubber sheet with elastic function. The elastic pressure plate 72 is pressed between the upper pressure plate 82 and the rotating shaft 71. The deformation of the rubber sheet presses the rotating shaft, completing the fastening installation of the cross joint plate 1. This allows the cross joint plate 1 to rotate relative to the lower support assembly 6 and the upper pressure seat assembly 6 via the rotating shaft 71. That is, the telescopic device achieves the vertical cornering function through the rotating shaft 71. After installation, the top of the L-shaped buckle plate 81 is interlocked with the lower support 62 and hugs the rotating shaft 71. The support rib plate 61 and the lower support 62 are welded to the height adjustment plate and the outer wall of the L-shaped buckle plate 81 via the connecting plate 9. The L-shaped buckle plate 81 can also be welded and fixed to the height adjustment plate.

[0049] In addition, the L-shaped buckle 81 can also be a single piece, with the elastic pressure plate 72 pressed between the pivot and the L-shaped buckle 81.

[0050] like Figure 2 , Figure 5 and Figure 6As shown, an elastic fastening assembly 10 is installed at the bottom of the cross joint plate 1. Along the longitudinal direction of the bridge, the elastic fastening assembly 10 is located on the front side, i.e., the inner side, of the lower support assembly 6. The elastic fastening assembly 10 is fixed to the first embedded steel plate 11 at the bottom of the first mounting slot 31. In this embodiment, the elastic fastening assembly 10 includes a housing 101, bolts 102, and an elastic body 103. The bottom of the housing 101 is welded and fixed to the first embedded steel plate at the bottom of the first mounting slot 31. The bolts 102 are located inside the housing 101, with their heads extending upwards out of the housing 101 and connected and fixed to the bottom of the cross joint plate 1. The elastic body 103 is located inside the housing 101 and sleeved on the bolts 102. The housing 101 is made of steel plate, which protects the elastic body 103. This elastic fastening assembly 10 has certain horizontal and vertical rotation functions. The elastic body can be made of various elastic materials such as springs, rubber, spring sheets, and spring wires.

[0051] like Figure 2 and Figure 3 As shown, a second embedded steel plate 12 is provided at the bottom of the second mounting slot 41. The bottom of the saddle support frame 14 is welded to the second embedded steel plate 12. The top of the saddle support frame 14 is welded to the bottom of the fixing plate 2. The top of the saddle support frame 14 has a sliding groove 141, which is used to adjust the flatness of the fixing plate 2 with the bridge deck.

[0052] The bridge expansion joint in this embodiment is a concrete-free structure, with a crash barrier 13 installed on the outer side of the height adjustment plate. The crash barrier 13 can be made of steel plate and its height can be adjusted according to the actual installation size requirements. Figure 2 As shown, the bridge deck pavement layer 18 is laid on the outside of the crash barrier 13, and the upper surfaces of the joint plate 1, the fixing plate 2, and the crash barrier 13 are flush with the upper surface of the bridge deck pavement layer 18. The bridge deck pavement layer 18 can be made of various paving materials, such as asphalt, concrete, and epoxy resin.

[0053] In addition, the corresponding height adjustment component 5, lower support component 6, and upper pressure component 8 are used as a set of support components, such as Figure 1 As shown, four sets of support components are provided at the outer end, i.e., the root, of a cross-joint plate 1. Figure 4 As shown, three sets of support components are provided at the outer end, i.e., the root, of a cross joint plate 1. The number of support components can be set according to the different widths of the cross joint plate 1.

[0054] When the bridge undergoes horizontal lateral displacement, the elastic deformation of the front row elastic fastening assembly 10 and the elastic pressure plate 72, as well as the gap between the comb teeth, enables lateral rotation. When the bridge undergoes vertical movement, the vertical rotation function of the telescopic device is realized through the rotation between the upper pressure seat assembly 8 and the rotating shaft assembly 7.

[0055] The installation process of the bridge expansion joint in this embodiment is as follows: excavation of the expansion joint slot, cleaning of the slot, inspection of the pre-embedded steel plate in the slot, installation of the elastic component support group, installation of the lower template of the expansion component, completion of installation of each component of the expansion joint, pouring of the elastic component, and completion of the installation of the expansion joint.

[0056] Specifically, the steps include the following:

[0057] s1. Excavate and clean the entire area of ​​the slot where the expansion joint is installed, and measure the depth of the slot;

[0058] s2. Based on the groove depth measured by s1, the height adjustment component 5 of the telescopic device is processed accordingly, and the height adjustment component 5 is welded onto the first pre-embedded steel plate 11, and the welding slag and weld are cleaned.

[0059] s3. Install fixing plate 2 and adjust the flatness of fixing plate 2 with the bridge deck;

[0060] s4. Install the cross joint plate 1. After adjusting the flatness between the cross joint plate 1 and the fixed plate 2 to meet the requirements, install the lower support assembly 6, the rotating shaft assembly 7 and the upper pressure seat assembly 8. After the positions of the lower support assembly 6 and the upper pressure seat assembly 8 are adjusted, weld the lower support assembly 6 and the upper pressure seat assembly 8 to the height adjustment assembly 5 and fix them.

[0061] s5. Pour concrete into the first installation slot 31 and the second installation slot 41. 17. Curing is performed to complete the installation of the expansion joint.

[0062] In step s2, the bottom of the saddle support frame 14 is welded to the second embedded steel plate 12, and the top of the saddle support frame 14 is welded to the bottom of the fixing plate 2. The flatness of the fixing plate 2 and the bridge surface is adjusted by the sliding groove 141 on the top of the saddle support frame 14.

[0063] In this embodiment, the following two steps can be inserted between steps s4 and s5: a) a crash barrier 13 is welded and fixed to the outside of the height adjustment component 5, and the upper surface of the crash barrier 13 is flush with the bridge road surface; b) the weld and slag are cleaned to ensure that the installation groove is clean.

[0064] In addition, in step s4, adjusting screws are used as adjusting fasteners. The upper positioning hole 80 and the lower positioning hole 60 are screw holes. First, the adjusting screws are used to adjust the lower support assembly 6, the upper pressure seat assembly 8, and the cross-slot plate 1 into place and then tightened. Then, the lower support assembly 6, the upper pressure seat assembly 8, and the height adjustment assembly 5 are welded and fixed. Finally, the adjusting screws are removed, and the screw holes are plugged or sealed with elastic glue. Alternatively, using tooling, the upper pressure seat assembly 8 is leveled with the cross-slot plate 1 as a reference, and the lower support assembly 6 is welded to the inside of the upper pressure seat assembly 8. After that, the upper pressure seat assembly 8 is welded and tightened to the height adjustment assembly 5.

[0065] In summary, the bridge expansion joint of this embodiment, in addition to lateral displacement, can also achieve horizontal and vertical rotation. By using a snap-fit ​​mechanism instead of bolts for fastening, the multi-directional displacement bridge expansion joint achieves boltless installation, eliminating bolt holes on the plate surface, reducing noise from passing vehicles, eliminating bolt and nut loosening issues, and providing anti-detachment functionality. During installation, the height of the components is adjusted according to the groove depth to ensure the flatness of the expansion joint with the bridge surface, and it is directly welded to the groove steel plate, reducing intermediate steps. This enables rapid installation of the expansion joint. Example 2:

[0066] like Figures 9 to 13 As shown, the bridge expansion joint in this embodiment has a concrete structure. The height adjustment component 5 is an L-shaped connecting plate 52, and the lower support component 6 and the upper pressure seat component 8 are welded and fixed to the L-shaped connecting plate 52. The elastic fastening component 10 in this embodiment includes an elastic body 104, an upper connecting steel bar 105, a lower connecting steel bar 106, and a threaded end 107. The threaded end 107 is located at the top of the elastic body 104 and is connected and fixed to the bottom of the cross joint plate 1. The upper connecting steel bar 105 is used to connect and fix to the concrete 17 in the first mounting slot 31 to increase the gripping force. The lower connecting steel bar 106 is welded and fixed to the lower support component 6. In this embodiment, a shear nail 15 is installed at the bottom of the second mounting slot 41, and the fixing plate 2 is fastened to the shear nail 15 by the anchoring component 16. The remaining structure of this embodiment is the same as that of Embodiment 1, and will not be described in detail here.

Claims

1. A bridge expansion joint, comprising a joint plate (1) and a fixing plate (2) that cooperate with each other, wherein the joint plate (1) is installed in a first mounting slot (31) at the end of a first beam (3), and the fixing plate (2) is installed in a second mounting slot (41) at the end of a second beam (4), characterized in that: The first mounting slot (31) is provided with a height adjustment component (5), a lower support component (6), a rotating shaft component (7), and an upper pressure seat component (8). The height adjustment component (5) is fixed in the first mounting slot (31). The lower support component (6) is fixed to the height adjustment component (5). The rotating shaft component (7) is supported on the lower support component (6) and arranged in the transverse direction. The upper pressure seat component (8) is located above the lower support component (6) and presses the rotating shaft component (7). The upper pressure seat component (8) is fixed to the height adjustment component (5). Thus, the cross-slot plate and the fixing plate achieve a boltless fastening installation structure.

2. The bridge expansion joint according to claim 1, characterized in that: The lower support assembly (6) has a vertically arranged lower positioning hole (60), and the upper pressure seat assembly (8) has a vertically arranged upper positioning hole (80). The upper positioning hole (80) corresponds one-to-one with the lower positioning hole (60). The detachable adjusting fastener passes through the upper positioning hole (80) and the corresponding lower positioning hole (60) from top to bottom to adjust the installation position of the lower support assembly (6), the upper pressure seat assembly (8), and the cross joint plate (1).

3. The bridge expansion joint according to claim 2, characterized in that: The lower support assembly (6) includes a support rib (61) and a lower support (62) supported on the support rib. The upper pressure seat assembly (8) includes an L-shaped buckle plate (81). The rotating shaft assembly (7) includes a rotating shaft (71) fixed to the bottom of the cross joint plate (1). The top of the L-shaped buckle plate (81) is fastened to the lower support (62) and hugs the rotating shaft (71). The outer side wall of the L-shaped buckle plate (81) is fixed on the height adjustment assembly (5). The lower positioning hole (60) is provided on the lower support (62), and the upper positioning hole (80) is provided on the top of the L-shaped buckle plate (81).

4. The bridge expansion joint according to claim 3, characterized in that: The L-shaped buckle (81) includes a first buckle plate (811) and a second buckle plate (812). An upper pressure plate (82) for pressing down the rotating shaft (71) is sandwiched between the first buckle plate (811) and the second buckle plate (812). The rotating shaft assembly (7) also includes an elastic pressure plate (72) disposed between the upper pressure plate (82) and the rotating shaft (71).

5. The bridge expansion joint according to claim 3, characterized in that: The L-shaped buckle (81) is a single piece, and the pivot assembly (7) also includes an elastic pressure plate (72) disposed between the top of the L-shaped buckle (81) and the pivot (71).

6. The bridge expansion joint according to claim 3, characterized in that: The height adjustment component (5) is a height adjustment plate, which is located on the outside of the support rib (61), the lower support (62) and the L-shaped buckle (81). The inner side of the height adjustment plate is formed with a stepped part, and the outer side wall of the L-shaped buckle (81) is supported on the stepped part. The support rib (61) and the lower support (62) are connected and fixed to the height adjustment plate and the outer side wall of the L-shaped buckle (81) through the connecting plate (9).

7. The bridge expansion joint according to claim 2, characterized in that: A first embedded steel plate (11) is installed at the bottom of the first mounting slot (31), and the bottom of the height adjustment component (5) is welded and fixed to the first embedded steel plate (11).

8. The bridge expansion joint according to claim 1, characterized in that: The height adjustment component (5) is an L-shaped connecting plate (52), and the lower support component (6) and the upper pressure seat component (8) are welded and fixed on the L-shaped connecting plate (52).

9. The bridge expansion joint according to claim 1, characterized in that: The bottom of the cross joint plate (1) is also equipped with an elastic fastening component (10). Along the longitudinal bridge direction, the elastic fastening component (10) is located on the front side of the lower support assembly (6). The elastic fastening component (10) is fixed to the bottom of the first mounting slot (31) or fixed to the lower support assembly (6).

10. The bridge expansion joint according to claim 9, characterized in that: The elastic fastening assembly (10) includes a housing (101), a bolt (102), and an elastic body (103). The bottom of the housing (101) is fixed to the bottom of the first mounting slot (31). The bolt (102) is located inside the housing (101), and the head of the bolt (102) extends upward out of the housing (101) and is connected and fixed to the bottom of the cross joint plate (1). The elastic body (103) is located inside the housing (101) and is sleeved on the bolt (102).

11. The bridge expansion joint according to claim 9, characterized in that: The elastic fastening assembly (10) includes an elastic body (104), an upper connecting steel bar (105), a lower connecting steel bar (106), and a threaded end (107). The threaded end (107) is located on the top of the elastic body (104) and is connected and fixed to the bottom of the cross joint plate (1). The upper connecting steel bar (105) is used to connect and fix to the concrete (17) in the first mounting slot (31). The lower connecting steel bar (106) is connected and fixed to the lower support assembly (6).

12. The bridge expansion joint according to claim 1, characterized in that: A crash barrier (13) is installed on the outer side of the height adjustment component (5).

13. The bridge expansion joint according to claim 1, characterized in that: The cross-slit plate (1) and the fixing plate (2) are comb-tooth plates that are intersected and spaced apart from each other.

14. The bridge expansion joint according to any one of claims 1 to 13, characterized in that: A second embedded steel plate (12) is provided at the bottom of the second mounting slot (41), and the fixing plate (2) is fixed on the second embedded steel plate (12) by a saddle-type support frame (14).

15. The bridge expansion joint according to any one of claims 1 to 13, characterized in that: A shear stud (15) is installed at the bottom of the second mounting slot (41), and the fixing plate (2) is fastened to the shear stud (15) by an anchoring assembly (16).

16. A method for installing a bridge expansion joint, characterized in that: This is achieved using the bridge expansion joint as described in claim 7, and the installation method includes the following steps: s1. Excavate and clean the entire area of ​​the slot where the expansion joint is installed, and measure the depth of the slot; s2. Based on the groove depth measured by s1, the height adjustment component (5) of the telescopic device is processed accordingly, and the height adjustment component (5) is welded onto the first pre-embedded steel plate (11), and the welding slag and weld are cleaned. s3. Install the fixing plate (2) and adjust the flatness of the fixing plate (2) with the bridge deck; s4. Install the cross joint plate (1), and after adjusting the flatness between the cross joint plate (1) and the fixed plate (2) to meet the requirements, install the lower support assembly (6), the rotating shaft assembly (7) and the upper pressure seat assembly (8). After the positions of the lower support assembly (6) and the upper pressure seat assembly (8) are adjusted, fix the lower support assembly (6) and the upper pressure seat assembly (8) with the height adjustment assembly (5). s5. Pour concrete into the first installation slot (31) and the second installation slot (41), and cure it to complete the installation of the expansion joint.

17. The method for installing a bridge expansion joint according to claim 16, characterized in that: Immediately following step s4 and before step s5, a crash barrier (13) is welded and fixed to the outside of the height adjustment component (5), and the upper surface of the crash barrier (13) is flush with the bridge road surface.

18. The method for installing a bridge expansion joint according to claim 16, characterized in that: Before step s5, clean the weld seam and weld slag to ensure that the installation slot is clean.

19. The method for installing a bridge expansion joint according to claim 16, characterized in that: In step s4, adjusting screws are used as adjusting fasteners. The upper positioning hole (80) and the lower positioning hole (60) are screw holes. First, the adjusting screws are used to adjust the lower support assembly (6), the upper pressure seat assembly (8) and the cross joint plate (1) into place and then tighten them. Then, the lower support assembly (6), the upper pressure seat assembly (8) and the height adjustment assembly (5) are welded and fixed. Finally, the adjusting screws are removed and the screw holes are plugged or sealed with elastic glue.

20. The method for installing a bridge expansion joint according to claim 16, characterized in that: In step s4, the upper pressure seat assembly (8) is leveled using the tooling with the cross-slit plate (1) as a reference, and the lower support assembly (6) is welded to the inside of the upper pressure seat assembly (8); then, the upper pressure seat assembly (8) is welded and fastened to the height adjustment assembly (5).

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