A bridge expansion joint structure

Abstract

This application relates to a bridge expansion joint structure, specifically within the technical field of expansion joints. The bridge expansion joint structure includes an expansion joint body, anchoring components, and a filling layer, all mounted on the beam. An installation groove is provided at the expansion joint location on the beam, exposing a portion of the original pre-embedded steel mesh within the groove. The expansion joint body is positioned within the installation groove, and the anchoring components are also positioned within the groove, connecting to the original pre-embedded steel mesh and the beam, thus fixing the expansion joint body. The filling layer covers the anchoring components and the exposed original pre-embedded steel mesh, forming an anchoring zone that anchors the expansion joint body. This application bridges the old and new structures through the anchoring components, allowing vehicle impact loads to be transferred from the expansion joint body to the anchoring components, and then further distributed uniformly through the original pre-embedded steel mesh to the deeper layers of the beam. This ultimately forms an integrated force transmission system, achieving three-dimensional load diffusion and impact resistance enhancement in the anchoring zone, thereby improving the service life of the repaired expansion joint.

Description

Technical Field

[0001] This application relates to the technical field of expansion joints, and in particular to a bridge expansion joint structure. Background Technology

[0002] Bridge expansion joints, as key components for regulating bridge beam deformation, bear long-term vehicle impact loads in their anchorage zones, making them prone to structural damage, especially under heavy-load conditions. Existing expansion joint anchorage systems suffer from the following main drawbacks:

[0003] 1. Weak anchorage: The original embedded steel bars are prone to breakage due to corrosion or fatigue. Traditional repair methods, such as local rebar installation, are difficult to form an overall load-bearing system, resulting in stress concentration at the interface between the old and new anchorages.

[0004] 2. Concrete cracking: Ordinary concrete in the anchorage zone has insufficient impact resistance, and cracks will appear under repeated heavy loads and extend to the steel reinforcement anchorage point, causing a chain reaction of failures;

[0005] 3. Connection failure: The welding area between the expansion joint steel and the anchor bar is insufficient and there is no misalignment compensation mechanism. When the beam undergoes torsional deformation, the stress in the weld exceeds the limit and breaks.

[0006] The aforementioned defects make the expansion joint anchorage area a frequently replaced part. However, conventional replacement processes only involve simple replacement of the damaged parts without reconstructing the anchorage system, resulting in a significant reduction in the service life after repair. Utility Model Content

[0007] To improve the service life of repaired expansion joints, this application provides a bridge expansion joint structure.

[0008] This application provides a bridge expansion joint structure, which adopts the following technical solution:

[0009] A bridge expansion joint structure includes an expansion joint body, an anchoring component, and a filling layer, all mounted on a beam. An installation groove is provided at the expansion joint of the beam, with a portion of the original pre-embedded steel mesh exposed within the groove. The expansion joint body is positioned within the installation groove. The anchoring component is positioned within the installation groove and connected to the original pre-embedded steel mesh and the beam, thus fixing the expansion joint body. The filling layer covers the anchoring component and the exposed original pre-embedded steel mesh, forming an anchoring zone for anchoring the expansion joint body.

[0010] By adopting the above technical solution, the anchoring component bridges the old and new structures, allowing the vehicle impact load to be transferred from the main body of the expansion joint to the anchoring component, and then to the deep layers of the beam through the original pre-embedded steel mesh for uniform diffusion, ultimately forming an overall force transmission system. This achieves three-dimensional diffusion of load in the anchoring area and impact resistance enhancement, thereby improving the service life of the repaired expansion joint.

[0011] Furthermore, the anchoring assembly includes:

[0012] Rebar installation, wherein the rebar is placed at the bottom of the installation groove and inserted deep into the beam;

[0013] A two-way steel mesh is provided, which is set in the installation groove and forms an overlapping welded structure with the original pre-embedded steel mesh. The top side of the rebar is welded and fixed to the intersection node of the two-way steel mesh to form a mesh skeleton.

[0014] By adopting the above technical solution, the vertical anchoring force of the rebar is transformed into a planar load through the bidirectional steel mesh and distributed to the original pre-embedded steel mesh. At the same time, the lap-welded structure makes the new and old steel meshes form a continuous force transmission interface, avoiding local debonding and improving the anchoring stability.

[0015] Furthermore, a bending portion is provided on the side of the rebar away from the installation groove. The bending portion and the rebar form an L-shaped structure. The bending portion is welded to the top side of the bidirectional steel mesh and is used to prevent the bidirectional steel mesh from moving away from the bottom of the installation groove.

[0016] By adopting the above technical solution, the bending part is pressed against the bidirectional steel mesh, and the stopper detaches upward during impact. It is welded with the joint of the anchor and the side wall to the node of the bidirectional steel mesh to form a double redundant constraint, which ultimately reduces the probability of displacement of the bidirectional steel mesh under heavy load.

[0017] Furthermore, the expansion joint body includes two sets of shaped steel and a sealing rubber strip. The two sets of shaped steel are symmetrically arranged, and the sealing rubber strip is placed between the two sets of shaped steel and used to seal the expansion joint.

[0018] By adopting the above technical solution, symmetrical irregular steel can be allowed to move laterally, while the sealing rubber strip can adapt to expansion and contraction. In addition, the rubber strip can be replaced individually, which ultimately improves the maintenance convenience of the expansion joint body.

[0019] Furthermore, the anchoring assembly also includes a misalignment compensation frame, which consists of multiple sets of connecting steel bars and multiple sets of supporting steel bars. The connecting steel bars are welded and fixed to the original pre-embedded steel mesh, and the multiple sets of supporting steel bars are staggered and spaced with the original pre-embedded steel mesh and connected and fixed by the connecting steel bars.

[0020] By adopting the above technical solution, the misalignment compensation frame achieves three-dimensional position compensation through a three-dimensional frame connecting the reinforcing bars and supporting the reinforcing bars. At the same time, the connecting reinforcing bars are welded with the original embedded reinforcing bar mesh, and the supporting reinforcing bars cross the misalignment area to support the main body of the expansion joint, thereby improving the stability of the main body of the expansion joint.

[0021] Furthermore, the supporting steel bar includes a fixing part, a connecting part, and a supporting part. The fixing part is disposed on multiple sets of connecting steel bars. The fixing part is welded and fixed to the side wall of the expansion joint body on the side near the expansion joint body. The connecting part is disposed on the side of the fixing part away from the expansion joint and is used to connect the supporting part. The supporting part is used to support and fix the bottom of the expansion joint body on the side near the expansion joint body.

[0022] By adopting the above technical solution, the fixing part is fixedly connected to multiple sets of connecting steel bars, and the connecting part connects the fixing part and the supporting part. The supporting part provides support to the bottom of the expansion joint body, and the fixing part provides fixation to the side wall of the expansion joint body, ultimately forming an anti-torsional triangular zone, which reduces the probability of weld fracture caused by torsional deformation of the beam.

[0023] Furthermore, the top surface of the irregular steel is lower than the adjacent road surface.

[0024] By adopting the above technical solution, the height of the top surface of the special-shaped steel is lower than that of the adjacent road surface, which effectively prevents the impact damage caused by vehicle bounce, allows the vehicle tires to transition smoothly, and reduces the instantaneous impact on the anchorage area.

[0025] Furthermore, the filling layer is a concrete layer covering the anchoring component, and steel fibers are mixed in the filling layer.

[0026] By adopting the above technical solution, steel fibers are incorporated into the concrete, which improves the impact toughness of the concrete and ultimately enhances the crack resistance of the filling layer.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] By welding rebars and bidirectional steel mesh to form a grid anchor body, and by using a misalignment compensation plate to bridge the original embedded steel mesh with the main body of the expansion joint, the entire force transmission system is finally wrapped by a filling layer formed by steel fiber concrete, realizing three-dimensional diffusion of load in the anchorage area and impact resistance enhancement, thereby improving the service life of the repaired expansion joint. Attached Figure Description

[0029] Figure 1 This is a cross-sectional structural diagram of this application;

[0030] Figure 2 This is a schematic diagram of the double-sided steel mesh and rebar installation structure of this application;

[0031] Figure 3 This is a schematic diagram showing the positional relationship between the original embedded steel mesh, the misalignment compensation frame, and the main body of the expansion joint in this application;

[0032] Figure 4 This is a schematic diagram of the supporting steel reinforcement structure of this application.

[0033] Reference numerals: 1. Beam; 11. Installation groove; 12. Original embedded steel mesh; 2. Expansion joint body; 21. Special-shaped steel; 22. Sealing rubber strip; 3. Anchoring component; 31. Rebar installation; 311. Bending part; 32. Two-way steel mesh; 4. Misalignment compensation frame; 41. Connecting steel bar; 42. Supporting steel bar; 421. Fixing part; 422. Connecting part; 423. Supporting part; 5. Filling layer. Detailed Implementation

[0034] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0035] This application discloses a bridge expansion joint structure.

[0036] Reference Figure 1 A bridge expansion joint structure includes an expansion joint body 2, an anchoring component 3, and a filling layer 5, all mounted on a beam 1. An installation groove 11 is provided at the expansion joint of the beam 1, exposing a portion of the original pre-embedded steel mesh 12 within the installation groove 11. The expansion joint body 2 is positioned within the installation groove 11. The anchoring component 3 is positioned within the installation groove 11 and connected to the original pre-embedded steel mesh 12 and the beam 1, thus fixing the expansion joint body 2. The filling layer 5 covers the anchoring component 3 and the exposed original pre-embedded steel mesh 12, forming an anchoring zone for anchoring the expansion joint body 2.

[0037] Reference Figure 1 Before construction, the required width for construction is measured from the center line of the expansion joint to be replaced to both sides, and the edge line is drawn. The width is reserved according to the different models of expansion joints. Then, a concrete cutting machine is used to cut the cement concrete pavement layer according to the drawn edge line. Then, an air compressor and a pneumatic hammer are used to remove the cement concrete pavement layer at the expansion joint and clean it. The surface of the concrete of the installation groove 11 is roughened and the dust is blown away with an air compressor pipe to complete the construction of the installation groove 11. Then, the exposed original embedded steel mesh 12 in the installation groove 11 is inspected to ensure its integrity. If there is bending or deformation, it is straightened to ensure accurate position and form. If there are missing, damaged, or insufficient height of the original embedded bars, new steel bars are inserted. The newly inserted steel bars are inserted in the same direction as the expansion joint anchor bars to ensure that the newly inserted steel bars have good stress and welding with the expansion joint anchor bars.

[0038] Reference Figure 1 and Figure 2The anchoring component 3 includes a rebar 31 and a bidirectional steel mesh 32. The rebar 31 is fixedly installed at the bottom of the installation groove 11 and inserted deep into the beam 1, with the axis of the rebar 31 perpendicular to the road surface. The bidirectional steel mesh 32 is placed in the installation groove 11, overlapping the top of the original pre-embedded steel mesh 12 and welded to it, thus forming an overlapping welded structure. The top of the rebar 31 is welded to the intersection of the bidirectional steel mesh 32, thus forming a mesh skeleton. To improve the fixation between the rebar 31 and the bidirectional steel mesh 32, a bending part 311 is provided on the side of the rebar 31 away from the installation groove 11. The bending part 311 and the rebar 31 form an L-shaped structure. The bending part 311 is welded to the top of the bidirectional steel mesh 32, preventing the bidirectional steel mesh 32 from moving away from the bottom of the installation groove 11, thus improving the stability of the anchoring component 3. In this embodiment, the bidirectional steel mesh 32 is composed of multiple sets of mutually perpendicular steel bars.

[0039] Reference Figure 3 The anchoring component 3 also includes a misalignment compensation frame 4, which is composed of multiple sets of connecting steel bars 41 and multiple sets of supporting steel bars 42. The connecting steel bars 41 are welded and fixed to multiple sets of original pre-embedded steel mesh 12. The multiple sets of connecting steel bars 41 are parallel to each other and parallel to each other in the length direction of the expansion joint body 2. The multiple sets of supporting steel bars 42 are staggered with the original pre-embedded steel mesh 12 and are connected and fixed by the connecting steel bars 41. The supporting steel bars 42 are perpendicular to the connecting steel bars 41.

[0040] Reference Figure 1 and Figure 4 The supporting steel bar 42 includes a fixing part 421, a connecting part 422, and a supporting part 423. The bottom of the fixing part 421 is erected on top of multiple sets of connecting steel bars 41 and welded and fixed. The side of the fixing part 421 near the expansion joint body 2 is welded and fixed to the side wall of the expansion joint body 2. The connecting part 422 is used to connect the supporting part 423 and the side of the fixing part 421 away from the expansion joint body 2. The fixing part 421 and the supporting part 423 are parallel to each other. The side of the supporting part 423 near the expansion joint body 2 is used to support and fix the bottom of the expansion joint body 2. Finally, the supporting steel bar 42, which is welded and fixed to the connecting steel bar 41, forms an anti-torsional triangular area, reducing the probability of weld fracture caused by torsional deformation of the beam 1. In this embodiment, some of the anchor bars 31 near the supporting steel bar 42 are welded and fixed to the fixing part 421 and the supporting part 423, so that the supporting steel bar 42 and the two-way steel mesh 32 are connected as a whole.

[0041] Reference Figure 1The expansion joint body 2 includes two sets of special-shaped steel 21 and a sealing rubber strip 22. The two sets of special-shaped steel 21 are symmetrically arranged, and the sealing rubber strip 22 is arranged between the two sets of special-shaped steel 21. The sealing rubber strip 22 is used to seal the expansion joint. In this embodiment, the expansion joint body is a D60 type structure, and the top surface of the special-shaped steel 21 is 1-2mm lower than the adjacent road surface.

[0042] Reference Figure 1 The filling layer 5 is a concrete layer covering the anchoring component 3. Specifically, it is formed by the solidification of concrete poured into the installation groove 11 and covering the anchoring component 3. Steel fibers are mixed in the filling layer 5 to form a steel fiber concrete layer. In this embodiment, the amount of steel fibers in the filling layer 5 is 90 kg / m³.

[0043] The working principle of this application embodiment is as follows:

[0044] By welding the rebar 31 to the bidirectional steel mesh 32 to form a mesh anchor body, and by using the misalignment compensation plate to bridge the original pre-embedded steel mesh 12 and the expansion joint body 2, the entire force transmission system is finally wrapped by the filling layer 5 formed by steel fiber concrete, realizing the three-dimensional diffusion of load in the anchorage area and the strengthening of impact resistance, thus improving the service life of the repaired expansion joint.

[0045] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A bridge joint structure, characterized by: The structure includes an expansion joint body (2), an anchoring component (3), and a filling layer (5) set on a beam (1). An installation groove (11) is provided at the expansion joint of the beam (1). The original pre-embedded steel mesh (12) in the installation groove (11) has a partially exposed structure. The expansion joint body (2) is set in the installation groove (11). The anchoring component (3) is set in the installation groove (11) and is connected to the original pre-embedded steel mesh (12) and the beam (1) to fix the expansion joint body (2). The filling layer (5) covers the anchoring component (3) and the exposed original pre-embedded steel mesh (12) and forms an anchoring area for anchoring the expansion joint body (2).

2. A bridge expansion joint structure according to claim 1, characterised in that: The anchoring component (3) includes: Rebar (31) is installed at the bottom of the mounting groove (11) and inserted deep into the beam (1); The bidirectional steel mesh (32) is set in the installation groove (11) and forms an lap welded structure with the original pre-embedded steel mesh (12). The top side of the anchor bar (31) is welded and fixed to the intersection node of the bidirectional steel mesh (32) to form a grid skeleton.

3. A bridge expansion joint structure according to claim 2, characterised in that: The rebar (31) is provided with a bend (311) on the side away from the installation groove (11). The bend (311) and the rebar (31) form an L-shaped structure. The bend (311) is welded to the top side of the bidirectional steel mesh (32) and is used to prevent the bidirectional steel mesh (32) from moving away from the bottom of the installation groove (11).

4. A bridge expansion joint structure according to claim 1, wherein: The expansion joint body (2) includes two sets of special-shaped steel (21) and a sealing rubber strip (22). The two sets of special-shaped steel (21) are arranged symmetrically, and the sealing rubber strip (22) is arranged between the two sets of special-shaped steel (21) and is used to seal the expansion joint.

5. A bridge expansion joint structure according to claim 2, wherein: The anchoring component (3) also includes a misalignment compensation frame (4), which is composed of multiple sets of connecting steel bars (41) and multiple sets of supporting steel bars (42). The connecting steel bars (41) are welded and fixed to the original pre-embedded steel mesh (12), and the multiple sets of supporting steel bars (42) are staggered and spaced with the original pre-embedded steel mesh (12) and connected and fixed by the connecting steel bars (41).

6. A bridge expansion joint structure according to claim 5, wherein: The supporting steel bar (42) includes a fixing part (421), a connecting part (422) and a supporting part (423). The fixing part (421) is provided on multiple sets of connecting steel bars (41). The fixing part (421) is welded and fixed to the side wall of the expansion joint body (2) on the side close to the expansion joint body (2). The connecting part (422) is provided on the side of the fixing part (421) away from the expansion joint and is used to connect the supporting part (423). The supporting part (423) is used to support and fix the bottom of the expansion joint body (2) on the side close to the expansion joint body (2).

7. A bridge expansion joint structure according to claim 4, wherein: The top surface of the special-shaped steel (21) is lower than that of the adjacent road surface.

8. A bridge expansion joint structure according to claim 1, wherein: The filling layer (5) is a concrete layer covering the anchoring component (3), and steel fibers are mixed in the filling layer (5).

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