A crack prevention device for highway bridges

Abstract

This utility model discloses a crack-prevention device for highway bridges, including a first bridge plate, a second bridge plate on one side of the first bridge plate, a first crack-prevention support plate below the first bridge plate, and a second crack-prevention support plate below the second bridge plate. A first pre-embedded reinforcing bar is fixed to one side of the interior of the first crack-prevention support plate, and a second pre-embedded reinforcing bar is fixed to one side of the interior of the second crack-prevention support plate. A buffer spring is provided between the first and second crack-prevention support plates, and connecting parts are welded to both ends of the buffer spring. Positioning seats are fixed to the bottom ends of the first and second crack-prevention support plates on both sides of the connecting parts, and positioning holes are provided inside the positioning seats. An elastic telescopic structure is provided between the first and second bridge plates. This utility model not only makes the buffer spring easy to disassemble and assemble, facilitating regular inspection and replacement, but also further improves the crack-prevention effect through the elastic rubber body.

Description

Technical Field

[0001] This utility model relates to the field of highway bridge construction technology, specifically to a crack prevention device for highway bridges. Background Technology

[0002] Highway bridges are structures built specifically for the passage of vehicles and pedestrians on highways. They are usually made of steel, reinforced concrete, or wood. In highway bridge engineering projects, cracks are the most common quality problem. They directly affect the performance and quality of highway bridges and can easily cause safety issues. Therefore, it is necessary to install anti-crack devices at the joints of highway bridges.

[0003] Most anti-crack devices prevent bridge structure cracking by installing springs between the bridge deck components at the joints. The elastic deformation of the springs absorbs vibration energy, reducing the dynamic stress on the bridge structure caused by vehicle traffic and wind, and preventing structural fatigue damage due to repeated vibration. However, the buffering effect of a single spring structure is limited, and its anti-crack performance is generally average. Moreover, since springs are exposed for a long time, they are prone to rust and aging, requiring regular inspection, maintenance, and replacement. However, springs are generally fixed by welding, which is inconvenient for disassembly and assembly. Therefore, improvements are urgently needed. Utility Model Content

[0004] The purpose of this utility model is to provide a crack prevention device for highway bridges, so as to solve the problems of the single spring structure of the crack prevention device proposed in the background art, which has general crack prevention performance and the inconvenience of spring disassembly and replacement.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a crack-prevention device for highway bridges, comprising a first bridge plate, a second bridge plate disposed on one side of the first bridge plate, a first crack-prevention support plate disposed below the first bridge plate, and a second crack-prevention support plate disposed below the second bridge plate. A first pre-embedded steel bar is fixed to one side of the interior of the first crack-prevention support plate, and a second pre-embedded steel bar is fixed to one side of the interior of the second crack-prevention support plate. A buffer spring is disposed between the first and second crack-prevention support plates, and connectors are welded to both ends of the buffer spring. The connectors have mounting holes inside. The bottom ends of the first and second crack-prevention support plates on both sides of the connectors are fixed... The device includes a positioning seat with a positioning hole inside. A mounting rod passes through the positioning hole and is threaded onto one end of the mounting rod. An elastic telescopic structure is provided between the first bridge plate and the second bridge plate. The elastic telescopic structure includes a first L-shaped telescopic plate and a second L-shaped telescopic plate. The first L-shaped telescopic plate and the second L-shaped telescopic plate are respectively installed on one end of the first bridge plate and the second bridge plate by a third bolt. The first telescopic part at one end of the first L-shaped telescopic plate is tightly engaged with the second telescopic part at one end of the second L-shaped telescopic plate. Elastic rubber is adhered inside the first L-shaped telescopic plate and the second L-shaped telescopic plate.

[0006] Preferably, the bottom of the second L-shaped telescopic plate is provided with an installation through groove, and the bottom end of the first L-shaped telescopic plate is welded with a positioning screw, and the bottom end of the positioning screw passes through the installation through groove and is threaded with a positioning nut.

[0007] Preferably, a protective structure is provided above the elastic telescopic structure, the protective structure including a first protective cover plate and a second protective cover plate, which facilitates the shielding of the elastic rubber body.

[0008] Preferably, the first protective cover and the second protective cover are disposed on the upper surface of the elastic telescopic structure, and the first sealing part at the bottom of the first protective cover and the second sealing part at the bottom of the second protective cover are tightly engaged, so that the first protective cover and the second protective cover extend and retract with the displacement of the first bridge plate and the second bridge plate.

[0009] Preferably, one end of the first protective cover and the second protective cover extends to the surface of the first bridge plate and the second bridge plate, respectively, and is fixedly connected to the first bridge plate and the second bridge plate by the first bolt.

[0010] Preferably, the first anti-crack support plate and the second anti-crack support plate are closely attached to the first bridge plate and the second bridge plate respectively, and are fixedly connected to the first bridge plate and the second bridge plate by the second bolts.

[0011] Preferably, the connector is a U-shaped structure, and the connector is sleeved with the first embedded steel bar and the second embedded steel bar respectively.

[0012] Preferably, a Lodile wedge-shaped locking washer is fitted on the mounting rod on one side of the fastening nut, and the Lodile wedge-shaped locking washer fits tightly with the fastening nut to prevent the fastening nut from loosening.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] By sequentially disassembling the fastening nut and the Lodil wedge-shaped locking washer, pulling the mounting rod out of the mounting hole and positioning hole, and then pulling down the connector to separate it from the first and second pre-embedded reinforcing bars, the buffer spring can be disassembled from the first and second anti-crack brackets. The above steps can be repeated in reverse during installation. This design makes the installation and disassembly of the buffer spring convenient and facilitates regular maintenance and replacement.

[0015] By setting an elastic telescopic structure between the first bridge plate and the second bridge plate, the elastic telescopic structure is composed of a first L-shaped telescopic plate and a second L-shaped telescopic plate. The first L-shaped telescopic plate and the second L-shaped telescopic plate are fixed to the ends of the first bridge plate and the second bridge plate by a third bolt. The first L-shaped telescopic plate and the second L-shaped telescopic plate expand and contract with the displacement of the first bridge plate and the second bridge plate through the first telescopic part and the second telescopic part. The elastic rubber body inside the first L-shaped telescopic plate and the second L-shaped telescopic plate can fill the gap between the first bridge plate and the second bridge plate through volume change during thermal expansion and contraction, adapt to deformation and prevent crack expansion, and further improve the crack prevention effect.

[0016] By setting a protective structure above the elastic telescopic structure, the protective structure consists of a first protective cover plate and a second protective cover plate. The first and second protective cover plates cover the surface of the elastic telescopic structure and shield the elastic rubber body. The first and second protective cover plates are locked together by a first sealing part and a second sealing part and extend and retract with the displacement of the first bridge plate and the second bridge plate. The sealing structure formed by the first and second protective cover plates can protect the elastic rubber body from dust, water, and wear, delay the aging of the elastic rubber body, and extend its service life. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the front cross-sectional structure of this utility model;

[0018] Figure 2 This is an enlarged schematic diagram of the elastic telescopic structure of this utility model;

[0019] Figure 3 This is a three-dimensional enlarged structural diagram of the elastic telescopic structure of this utility model;

[0020] Figure 4 This is an enlarged schematic diagram of the buffer spring structure of this utility model;

[0021] Figure 5 This is a three-dimensional enlarged structural diagram of the protective structure of this utility model.

[0022] In the diagram: 1. First bridge plate; 2. Elastic telescopic structure; 3. Elastic rubber body; 4. Protective structure; 401. First bolt; 5. Second bridge plate; 6. First anti-crack support plate; 7. Buffer spring; 8. Connector; 801. Mounting hole; 9. Second anti-crack support plate; 10. Second bolt; 11. First L-shaped telescopic plate; 1101. First telescopic part; 12. Second L-shaped telescopic plate; 1201. Second telescopic part; 13. Third bolt; 14. Mounting through groove; 15. Positioning screw; 16. Positioning nut; 17. First embedded steel bar; 18. Positioning seat; 1801. Positioning hole; 19. Mounting rod; 20. Fastening nut; 2001. LodiLock wedge-shaped locking washer; 21. Second embedded steel bar; 22. First protective cover plate; 2201. First sealing part; 23. Second protective cover plate; 2301. Second sealing part. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0024] Please see Figure 1-5 An embodiment of this utility model provides a crack prevention device for highway bridges, including a first bridge plate 1, a second bridge plate 5 on one side of the first bridge plate 1, a first crack prevention support plate 6 below the first bridge plate 1, and a second crack prevention support plate 9 below the second bridge plate 5. A first pre-embedded steel bar 17 is fixed inside one side of the first crack prevention support plate 6, and a second pre-embedded steel bar 21 is fixed inside one side of the second crack prevention support plate 9. A buffer spring 7 is provided between the first crack prevention support plate 6 and the second crack prevention support plate 9, and a connector 8 is welded to both ends of the buffer spring 7. The connector 8 has an installation hole 801 inside. A positioning seat 18 is fixed to the bottom end of the first crack prevention support plate 6 and the second crack prevention support plate 9 on both sides of the connector 8. The positioning seat 18 has a positioning hole 1801 inside. An installation rod 19 passes through the positioning hole 1801 and passes through the installation hole 801. A fastening nut 20 is threaded onto one end of the installation rod 19.

[0025] Specifically, the first anti-crack support plate 6 and the second anti-crack support plate 9 are fixed below the first bridge plate 1 and the second bridge plate 5 by the second bolt 10. The buffer spring 7 is installed between the first anti-crack support plate 6 and the second anti-crack support plate 9. The elastic deformation of the buffer spring 7 absorbs vibration energy, reduces the dynamic stress of the first bridge plate 1 and the second bridge plate 5 caused by vehicle driving, wind force, etc., and avoids structural fatigue damage caused by repeated vibration, thereby playing a role in preventing cracking.

[0026] Reference Appendix Figure 4During maintenance, when the buffer spring 7 is severely rusted and aged and needs replacement, the fastening nut 20 and the Lodile wedge-shaped locking washer 2001 are disassembled in sequence. The mounting rod 19 is then pulled out from the mounting hole 801 and the positioning hole 1801. The connecting piece 8 is then pulled down to separate it from the first embedded steel bar 17 and the second embedded steel bar 21, allowing the buffer spring 7 to be removed from between the first anti-crack support plate 6 and the second anti-crack support plate 9. The above steps are repeated in reverse for installation. This design makes the disassembly and assembly of the buffer spring 7 convenient and facilitates regular maintenance and replacement.

[0027] An elastic telescopic structure 2 is provided between the first bridge plate 1 and the second bridge plate 5. The elastic telescopic structure 2 includes a first L-shaped telescopic plate 11 and a second L-shaped telescopic plate 12. The first L-shaped telescopic plate 11 and the second L-shaped telescopic plate 12 are respectively installed at one end of the first bridge plate 1 and the second bridge plate 5 by a third bolt 13. The first telescopic part 1101 at one end of the first L-shaped telescopic plate 11 is tightly engaged with the second telescopic part 1201 at one end of the second L-shaped telescopic plate 12. An elastic rubber body 3 is adhered inside the first L-shaped telescopic plate 11 and the second L-shaped telescopic plate 12.

[0028] Specifically, see the attached document. Figure 2 and 3 The elastic telescopic structure 2 is disposed between the first bridge plate 1 and the second bridge plate 5. The elastic telescopic structure 2 is composed of a first L-shaped telescopic plate 11 and a second L-shaped telescopic plate 12. The first L-shaped telescopic plate 11 and the second L-shaped telescopic plate 12 are fixed to the ends of the first bridge plate 1 and the second bridge plate 5 by a third bolt 13. The first L-shaped telescopic plate 11 and the second L-shaped telescopic plate 12 expand and contract with the displacement of the first bridge plate 1 and the second bridge plate 5 through the first telescopic part 1101 and the second telescopic part 1201. The elastic rubber body 3 inside the first L-shaped telescopic plate 11 and the second L-shaped telescopic plate 12 can always fill the gap between the first bridge plate 1 and the second bridge plate 5 by volume change during thermal expansion and contraction, adapt to deformation and prevent crack expansion, and further improve the crack prevention effect.

[0029] The bottom of the second L-shaped telescopic plate 12 is provided with an installation through groove 14, and the bottom end of the first L-shaped telescopic plate 11 is welded with a positioning screw 15, and the bottom end of the positioning screw 15 passes through the installation through groove 14 and is threaded with a positioning nut 16.

[0030] A protective structure 4 is provided above the elastic telescopic structure 2. The protective structure 4 includes a first protective cover plate 22 and a second protective cover plate 23.

[0031] The first protective cover plate 22 and the second protective cover plate 23 are disposed on the upper surface of the elastic telescopic structure 2, and the first sealing part 2201 at the bottom of the first protective cover plate 22 is tightly engaged with the second sealing part 2301 at the bottom of the second protective cover plate 23.

[0032] One end of the first protective cover plate 22 and the second protective cover plate 23 extends to the surface of the first bridge plate 1 and the second bridge plate 5 respectively and is fixedly connected to the first bridge plate 1 and the second bridge plate 5 by the first bolt 401.

[0033] In addition, see attached document Figure 5 By setting a protective structure 4 above the elastic telescopic structure 2, the protective structure 4 is composed of a first protective cover plate 22 and a second protective cover plate 23. The first protective cover plate 22 and the second protective cover plate 23 cover the surface of the elastic telescopic structure 2 and shield the elastic rubber body 3. The first protective cover plate 22 and the second protective cover plate 23 are locked and sealed by the first sealing part 2201 and the second sealing part 2301 and extend and retract with the displacement of the first bridge plate 1 and the second bridge plate 5. The sealing structure composed of the first protective cover plate 22 and the second protective cover plate 23 can protect the elastic rubber body 3 from dust, water and wear, delay the aging of the elastic rubber body 3 and extend its service life.

[0034] The first anti-crack support plate 6 and the second anti-crack support plate 9 are respectively closely attached to the first bridge plate 1 and the second bridge plate 5 and are fixedly connected to the first bridge plate 1 and the second bridge plate 5 by the second bolt 10.

[0035] The connector 8 has a U-shaped structure and is sleeved with the first embedded steel bar 17 and the second embedded steel bar 21 respectively;

[0036] A Lodillac wedge-shaped locking washer 2001 is fitted on the mounting rod 19 on one side of the fastening nut 20, and the Lodillac wedge-shaped locking washer 2001 fits tightly against the fastening nut 20.

[0037] In this embodiment, the following steps are taken: First, the first anti-crack support plate 6 and the second anti-crack support plate 9 are fixed below the first bridge plate 1 and the second bridge plate 5 by the second bolt 10. A buffer spring 7 is installed between the first anti-crack support plate 6 and the second anti-crack support plate 9. The elastic deformation of the buffer spring 7 absorbs vibration energy, reducing the dynamic stress on the first bridge plate 1 and the second bridge plate 5 caused by vehicle movement, wind, etc., thus preventing structural fatigue damage due to repeated vibration and preventing cracking. Then, an elastic telescopic structure 2 is set between the first bridge plate 1 and the second bridge plate 5. The elastic telescopic structure 2 consists of a first L-shaped telescopic plate 1. The system comprises a first L-shaped telescopic plate 11 and a second L-shaped telescopic plate 12. The first L-shaped telescopic plate 11 and the second L-shaped telescopic plate 12 are fixed to the ends of the first bridge plate 1 and the second bridge plate 5 by a third bolt 13. The first L-shaped telescopic plate 11 and the second L-shaped telescopic plate 12 extend and retract with the displacement of the first bridge plate 1 and the second bridge plate 5 via the first telescopic part 1101 and the second telescopic part 1201. The elastic rubber body 3 inside the first L-shaped telescopic plate 11 and the second L-shaped telescopic plate 12 can always fill the gap between the first bridge plate 1 and the second bridge plate 5 through volume changes during thermal expansion and contraction, adapting to deformation and preventing crack propagation, further improving… The crack-resistant effect is improved. During maintenance, when the buffer spring 7 is severely rusted and aged and needs replacement, the fastening nut 20 and the Lodilock wedge-shaped locking washer 2001 are disassembled in sequence. The mounting rod 19 is pulled out from the mounting hole 801 and the positioning hole 1801. Then, the connecting piece 8 is pulled down to separate it from the first embedded steel bar 17 and the second embedded steel bar 21, so that the buffer spring 7 can be removed from the first anti-crack support plate 6 and the second anti-crack support plate 9. The above steps are repeated in reverse during installation. This design makes the disassembly and assembly of the buffer spring 7 convenient and facilitates regular maintenance and replacement. In addition, by setting a... A protective structure 4 is provided, which consists of a first protective cover plate 22 and a second protective cover plate 23. The first protective cover plate 22 and the second protective cover plate 23 cover the surface of the elastic telescopic structure 2 and shield the elastic rubber body 3. The first protective cover plate 22 and the second protective cover plate 23 are locked together by the first sealing part 2201 and the second sealing part 2301 and extend and retract with the displacement of the first bridge plate 1 and the second bridge plate 5. The sealing structure formed by the first protective cover plate 22 and the second protective cover plate 23 can protect the elastic rubber body 3 from dust, water and wear, delay the aging of the elastic rubber body 3 and extend its service life.

Claims

1. A crack prevention device for a highway bridge, comprising a first bridge plate (1), one side of the first bridge plate (1) being provided with a second bridge plate (5), characterized in that, A first anti-crack support plate (6) is provided below the first bridge plate (1), and a second anti-crack support plate (9) is provided below the second bridge plate (5). A first pre-embedded steel bar (17) is fixed on one side inside the first anti-crack support plate (6), and a second pre-embedded steel bar (21) is fixed on one side inside the second anti-crack support plate (9). A buffer spring (7) is provided between the first anti-crack support plate (6) and the second anti-crack support plate (9), and a connector (8) is welded to both ends of the buffer spring (7). An installation hole (801) is provided inside the connector (8). A positioning seat (18) is fixed at the bottom of the first anti-crack support plate (6) and the second anti-crack support plate (9) on both sides of the connector (8). A positioning hole (1801) is provided inside the positioning seat (1801), and an installation insert is inserted through the positioning hole (1801). A rod (19) is installed through a mounting hole (801), and a fastening nut (20) is threaded onto one end of the mounting rod (19). An elastic telescopic structure (2) is provided between the first bridge plate (1) and the second bridge plate (5). The elastic telescopic structure (2) includes a first L-shaped telescopic plate (11) and a second L-shaped telescopic plate (12). The first L-shaped telescopic plate (11) and the second L-shaped telescopic plate (12) are respectively installed at one end of the first bridge plate (1) and the second bridge plate (5) by a third bolt (13). The first telescopic part (1101) at one end of the first L-shaped telescopic plate (11) is tightly engaged with the second telescopic part (1201) at one end of the second L-shaped telescopic plate (12). An elastic rubber body (3) is adhered inside the first L-shaped telescopic plate (11) and the second L-shaped telescopic plate (12).

2. A crack prevention device for a highway bridge according to claim 1, characterized in that: The bottom of the second L-shaped telescopic plate (12) is provided with an installation through groove (14), and the bottom end of the first L-shaped telescopic plate (11) is welded with a positioning screw (15), and the bottom end of the positioning screw (15) passes through the installation through groove (14) and is threaded with a positioning nut (16).

3. A crack prevention device for a highway bridge according to claim 1, characterized in that: A protective structure (4) is provided above the elastic telescopic structure (2), and the protective structure (4) includes a first protective cover plate (22) and a second protective cover plate (23).

4. A crack prevention device for a highway bridge according to claim 3, characterized in that: The first protective cover (22) and the second protective cover (23) are disposed on the upper surface of the elastic telescopic structure (2), and the first sealing part (2201) at the bottom of the first protective cover (22) is tightly engaged with the second sealing part (2301) at the bottom of the second protective cover (23).

5. A highway bridge anti-cracking device according to claim 3, characterized in that: One end of the first protective cover (22) and the second protective cover (23) extends to the surface of the first bridge plate (1) and the second bridge plate (5) respectively and is fixedly connected to the first bridge plate (1) and the second bridge plate (5) by the first bolt (401).

6. A crack prevention device for a highway bridge according to claim 1, characterized in that: The first anti-crack support plate (6) and the second anti-crack support plate (9) are closely attached to the first bridge plate (1) and the second bridge plate (5) respectively, and are fixedly connected to the first bridge plate (1) and the second bridge plate (5) by the second bolt (10).

7. A highway bridge anti-cracking device according to claim 1, characterized in that: The connecting piece (8) is in U-shaped structure, and the connecting piece (8) is sleeved with the first embedded steel bar (17) and the second embedded steel bar (21) respectively.

8. A crack prevention device for highway bridges according to claim 1, characterized in that: The mounting plug rod (19) on one side of the fastening nut (20) is sleeved with a Loctite wedge-shaped locking washer (2001), and the Loctite wedge-shaped locking washer (2001) is closely attached to the fastening nut (20).

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