A new type of expansion joint structure for preventing thermal expansion and cold contraction of municipal bridges

Abstract

The utility model relates to municipal bridge technical field especially is a kind of municipal bridge heat expansion and cold contraction novel expansion joint structure, and the anchoring steel plate of left-right symmetry is set in the both sides of bridge joint, the anchoring steel plate is fixedly connected with bridge girder by embedded reinforcing bar, the elastic buffer assembly of being set between two anchoring steel plates, the support assembly of being set in the top of two anchoring steel plates.The utility model discloses a kind of municipal bridge heat expansion and cold contraction novel expansion joint structure, cooperates through elastic buffer assembly and transverse buffer piece, effectively absorbs vehicle impact and bridge heat expansion and cold contraction deformation energy;Support assembly adopts guide block-guide groove sliding structure with polytetrafluoroethylene coating, ensure that car cover plate slides smoothly, bridge deck is continuous and smooth, significantly improve driving comfort, structural durability and waterproof performance, applicable to municipal bridge efficient and reliable expansion needs.

Description

Technical Field

[0001] This utility model relates to the field of municipal bridge technology, and in particular to a novel expansion joint structure for municipal bridges to prevent thermal expansion and contraction. Background Technology

[0002] As key nodes in urban transportation networks, municipal bridges are constantly exposed to complex environments and dynamic loads. Due to the thermal expansion and contraction properties of building materials such as concrete and steel, bridge structures experience significant longitudinal expansion and contraction deformation under the influence of factors such as diurnal temperature differences, seasonal changes, and even uneven sunlight. Without proper and effective expansion joint devices, such deformation can lead to cracking of the bridge deck pavement, concrete collapse at the beam ends, bearing displacement, and even abnormal stress on piers, seriously threatening structural safety. Currently, common expansion joint types include plate rubber expansion joints, Maurer joints (modular type), and comb-tooth plate type, but each has obvious drawbacks: plate rubber joints have weak load-bearing capacity, are prone to aging and cracking, and are difficult to adapt to heavy traffic; modular joints are complex in structure, expensive, require strict installation precision, and generate significant noise when vehicles pass over them; while comb-tooth plate joints have high rigidity, they lack effective buffering, are prone to "bounce" phenomena, and the gaps easily accumulate debris, resulting in poor drainage and accelerated corrosion of the substructure. Furthermore, existing expansion joints generally lack effective mechanisms for regulating lateral displacement, and are prone to problems such as component loosening, sliding jamming, or sealing failure under long-term alternating loads. Therefore, we propose a novel expansion joint structure for municipal bridges to prevent thermal expansion and contraction. Utility Model Content

[0003] The main purpose of this utility model is to provide a new type of expansion joint structure for municipal bridges to prevent thermal expansion and contraction, which can effectively solve the problems in the background art.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A novel expansion joint structure for municipal bridges to prevent thermal expansion and contraction includes anchoring steel plates symmetrically arranged on both sides of the bridge joint. The anchoring steel plates are fixedly connected to the bridge beam through pre-embedded steel bars. An elastic buffer component is set between the two anchoring steel plates, and a support component is set on top of the two anchoring steel plates. The elastic buffer assembly includes two symmetrically arranged metal reinforcing plates, a high-damping rubber block connected between the two metal reinforcing plates, and a transverse buffer connecting the metal reinforcing plates to the corresponding anchoring steel plates.

[0005] Preferably, the transverse buffer includes a built-in groove formed on the inner side of the anchoring steel plate, a slide rod fixedly connected to the outer side of the metal reinforcing plate and slidingly engaged with the built-in groove, and a highly elastic polyurethane buffer column disposed between the slide rod and the built-in groove.

[0006] By adopting the above technical solution, the metal reinforcing sheet can slide smoothly along the chute when the bridge expands and contracts, and the polyurethane buffer column provides elastic restoring force and absorbs lateral displacement energy, effectively releasing temperature stress and avoiding cracking or damage caused by structural rigidity.

[0007] Preferably, the slide bar includes a connecting part fixedly connected to a metal reinforcing sheet and a sliding part slidably connected within a highly elastic polyurethane buffer column, wherein the diameter of the sliding part is larger than the diameter of the connecting part.

[0008] By adopting the above technical solution, the axial limiting step formed by the sliding part is used to reliably position the high elastic polyurethane buffer column, preventing it from falling out or shifting, while ensuring a stable and smooth sliding process, thus improving the durability and reliability of the buffer component.

[0009] Preferably, the support assembly includes two support plates and a crane cover plate. The two support plates are respectively fixedly welded to the top of two metal reinforcing plates. One end of the crane cover plate is fixedly connected to one side of the support plate, and the other end overlaps the other side of the support plate and is slidably connected to the support plate.

[0010] By adopting the above technical solutions, continuous bridge deck coverage can be achieved, which can adapt to the expansion and contraction of the bridge while keeping the driving surface flat, effectively avoiding the "jumping" problem of traditional expansion joints.

[0011] Preferably, the lower end of the vehicle cover plate is integrally formed with a guide block, and the upper end of the bearing plate is provided with a guide groove that is slidably connected to the guide block.

[0012] By adopting the above technical solution, a precisely guided sliding pair structure is formed, which restricts the lateral movement of the cover plate and ensures that it can freely expand and contract only along the longitudinal direction of the bridge, thereby improving operational stability and safety.

[0013] Preferably, the initial height of the high-damping rubber block is greater than the height of the metal reinforcing sheet, and its upper end face is in sliding contact with the lower end face of the vehicle cover plate.

[0014] By adopting the above technical solution, the rubber block is always involved in bearing the load and actively compresses to absorb energy under vehicle load, significantly improving vertical buffering performance and driving comfort.

[0015] Preferably, the upper surface of the vehicle cover is provided with anti-slip texture or anti-slip particle layer, and the lower end surface of the vehicle cover is provided with polytetrafluoroethylene coating.

[0016] By adopting the above technical solutions, driving safety in rainy and snowy weather is enhanced, and sliding friction resistance is significantly reduced, ensuring that the cover plate slides flexibly and is not prone to jamming during long-term use.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. Through the design of the elastic buffer component, the high-damping rubber block has excellent energy dissipation and resilience performance, which actively bears and buffers the vertical impact load when the vehicle passes through the expansion joint, effectively reducing bridge deck vibration and noise. At the same time, with the cooperation of the support component, the vehicle cover plate forms a stable sliding pair with the guide block and the guide groove on the bearing plate, and a polytetrafluoroethylene coating is set on its lower end face. This ensures that the bridge deck is continuous and flat, and the driving is stable. It also ensures that the cover plate slides smoothly and without jamming during the bridge expansion and contraction, which significantly improves driving comfort and structural durability.

[0018] 2. By setting a transverse buffer between the metal reinforcing plate and the corresponding anchoring steel plate, the metal reinforcing plate can slide freely along the built-in groove under the longitudinal displacement caused by the thermal expansion and contraction of the bridge, while the high-elasticity polyurethane buffer column provides appropriate elastic constraint and reset capability to avoid rigid collision or excessive displacement of metal components. This design not only effectively releases temperature stress and prevents structural cracking, but also enhances the overall deformation adaptability and long-term service stability of the expansion joint. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a novel expansion joint structure for municipal bridges designed to prevent thermal expansion and contraction according to this utility model. Figure 2 This is a schematic diagram of the composition of a novel expansion joint structure for municipal bridges to prevent thermal expansion and contraction, according to this utility model. Figure 3 This is a partial structural schematic diagram of an elastic buffer component of a novel expansion joint structure for municipal bridges designed to prevent thermal expansion and contraction. Figure 4 This is a schematic diagram of the support component of a novel expansion joint structure for municipal bridges designed to prevent thermal expansion and contraction.

[0020] In the diagram: 1. Anchor steel plate; 2. Embedded steel bar; 3. Elastic buffer assembly; 31. Metal reinforcing plate; 32. High damping rubber block; 33. Lateral buffer component; 331. Built-in slide groove; 332. Slide rod; 3321. Connecting part; 3322. Sliding part; 333. High elastic polyurethane buffer column; 4. Support assembly; 41. Bearing plate; 42. Overhead cover plate; 43. Guide groove; 44. Guide block. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0022] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] Please see Figure 1-4 This utility model provides a technical solution: A novel expansion joint structure for municipal bridges to prevent thermal expansion and contraction includes anchoring steel plates 1 symmetrically arranged on both sides of the bridge joint. The anchoring steel plates 1 are fixedly connected to the bridge beam through pre-embedded steel bars 2. An elastic buffer component 3 is set between the two anchoring steel plates 1, and a support component 4 is set on the top of the two anchoring steel plates 1.

[0025] In this embodiment, the elastic buffer assembly 3 includes two symmetrically arranged metal reinforcing plates 31, a high-damping rubber block 32 connected between the two metal reinforcing plates 31, and a transverse buffer member 33 connecting the metal reinforcing plates 31 and the corresponding anchoring steel plate 1; the support assembly 4 includes two bearing plates 41 and a crane cover plate 42. The two bearing plates 41 are respectively fixedly welded to the top of the two metal reinforcing plates 31. One end of the crane cover plate 42 is fixedly connected to one side of the bearing plate 41, and the other end overlaps on the other side of the bearing plate 41 and is slidably connected to the bearing plate 41; the lower end of the crane cover plate 42 is integrally formed with a guide block 44, and the upper end of the bearing plate 41 is provided with a guide groove 43 that is slidably connected to the guide block 44; the initial height of the high-damping rubber block 32 is greater than the height of the metal reinforcing plate 31, and its upper end surface is in sliding contact with the lower end surface of the crane cover plate 42; the upper surface of the crane cover plate 42 is provided with anti-slip texture or anti-slip particle layer, and the lower end surface of the crane cover plate 42 is provided with a polytetrafluoroethylene coating.

[0026] Through the above scheme: an elastic buffer assembly 3 is installed between the two anchoring steel plates 1, which consists of left and right metal reinforcing plates 31, a middle high-damping rubber block 32 and a transverse buffer 33. When the bridge expands and contracts due to temperature changes, the metal reinforcing plates 31 slide laterally in the built-in sliding groove 331 through the sliding rod 332. The high-elasticity polyurethane buffer column 333 provides elastic restoring force and absorbs lateral displacement energy. At the same time, the high-damping rubber block 32, because its initial height is higher than that of the metal reinforcing plates 31, always maintains contact with the lower end face of the vehicle cover plate 42. Under the action of vehicle load, it absorbs vertical impact through compression deformation. One end of the vehicle cover plate 42 is fixed, and the other end slides with the guide groove 43 on the bearing plate 41 through the guide block 44, so as to realize continuous passage on the bridge deck. The polytetrafluoroethylene coating at the bottom significantly reduces the sliding friction resistance and ensures that the expansion and contraction process is smooth and without jamming.

[0027] In this embodiment, the transverse buffer 33 includes an internal groove 331 formed inside the anchoring steel plate 1, a slide rod 332 fixedly connected to the outside of the metal reinforcing plate 31 and slidably engaged with the internal groove 331, and a high-elasticity polyurethane buffer column 333 disposed between the slide rod 332 and the internal groove 331; the slide rod 332 includes a connecting part 3321 fixedly connected to the metal reinforcing plate 31 and a sliding part 3322 slidably connected to the high-elasticity polyurethane buffer column 333, the diameter of the sliding part 3322 being larger than the diameter of the connecting part 3321.

[0028] The above solution involves setting a transverse buffer 33 between the metal reinforcing plate 31 and the corresponding anchoring steel plate 1, allowing the metal reinforcing plate 31 to slide freely along the built-in groove 331 under the longitudinal displacement caused by the thermal expansion and contraction of the bridge. Meanwhile, the high-elasticity polyurethane buffer column 333 provides appropriate elastic constraint and reset capability, avoiding rigid collision or excessive displacement of metal components. This design not only effectively releases temperature stress and prevents structural cracking, but also enhances the overall deformation adaptability and long-term service stability of the expansion joint.

[0029] It should be noted that this utility model is a novel expansion joint structure for municipal bridges to prevent thermal expansion and contraction. During use, firstly, the anchoring steel plates 1 on both sides are firmly embedded in the bridge beam concrete through pre-embedded reinforcing bars 2, forming a stable base for the entire expansion joint. An elastic buffer assembly 3 is installed between the two anchoring steel plates 1. This assembly consists of symmetrical metal reinforcing plates 31, a high-damping rubber block 32 connecting the two, and a transverse buffer 33 connecting the metal reinforcing plates 31 and the anchoring steel plates 1. When the bridge expands due to temperature increases, the two beams move closer together, pushing the anchoring steel plates 1 inwards. This, in turn, causes the metal reinforcing plates 31 to slide along the built-in groove 331 via the sliding rod 332, compressing the high-elasticity polyurethane buffer column 333, thus achieving transverse buffering. The flexible absorption of displacement; conversely, when the bridge contracts, the elastic restoring force of the polyurethane buffer column 333 pushes the metal reinforcing sheet 31 to reset, avoiding excessive gaps; at the same time, one end of the vehicle cover plate 42 in the support assembly 4 is fixed to one side of the bearing plate 41, and the other end is embedded in the guide groove 43 of the other side of the bearing plate 41 through the bottom integrally formed guide block 44, forming a reliable sliding guide structure; since the initial height of the high damping rubber block 32 is slightly higher than that of the metal reinforcing sheet 31, its upper end face always keeps in contact with the lower end face of the vehicle cover plate 42. Under the action of vehicle load, the rubber block undergoes controllable compression deformation, absorbs impact energy, and reduces sliding friction resistance through the polytetrafluoroethylene coating, ensuring that the cover plate slides smoothly without jumping or abnormal noise during the expansion and contraction process.

[0030] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A novel expansion joint structure for municipal bridges to prevent thermal expansion and contraction, characterized in that: Anchor steel plates (1) are symmetrically arranged on both sides of the bridge joint. The anchor steel plates (1) are fixedly connected to the bridge beam through pre-embedded steel bars (2). An elastic buffer assembly (3) is set between the two anchor steel plates (1). A support assembly (4) is set on the top of the two anchor steel plates (1). The elastic buffer assembly (3) includes two symmetrically arranged metal reinforcing plates (31), a high-damping rubber block (32) connected between the two metal reinforcing plates (31), and a transverse buffer (33) connecting the metal reinforcing plates (31) and the corresponding anchoring steel plate (1).

2. The novel expansion joint structure for municipal bridges to prevent thermal expansion and contraction as described in claim 1, characterized in that: The transverse buffer (33) includes an internal groove (331) opened on the inner side of the anchoring steel plate (1), a slide rod (332) fixedly connected to the outer side of the metal reinforcing plate (31) and slidingly engaged with the internal groove (331), and a high elastic polyurethane buffer column (333) disposed between the slide rod (332) and the internal groove (331).

3. The novel expansion joint structure for municipal bridges to prevent thermal expansion and contraction according to claim 2, characterized in that: The slide bar (332) includes a connecting part (3321) fixedly connected to the metal reinforcing plate (31) and a sliding part (3322) slidably connected in the high elastic polyurethane buffer column (333). The diameter of the sliding part (3322) is larger than the diameter of the connecting part (3321).

4. The novel expansion joint structure for municipal bridges to prevent thermal expansion and contraction according to claim 1, characterized in that: The support assembly (4) includes two support plates (41) and a vehicle cover plate (42). The two support plates (41) are respectively fixedly welded to the top of two metal reinforcing plates (31). One end of the vehicle cover plate (42) is fixedly connected to the support plate (41) on one side, and the other end overlaps the support plate (41) on the other side and is slidably connected to the support plate (41).

5. A novel expansion joint structure for municipal bridges to prevent thermal expansion and contraction according to claim 4, characterized in that: The lower end of the vehicle cover plate (42) is integrally formed with a guide block (44), and the upper end of the bearing plate (41) is provided with a guide groove (43) that is slidably connected to the guide block (44).

6. A novel expansion joint structure for municipal bridges to prevent thermal expansion and contraction according to claim 1, characterized in that: The initial height of the high-damping rubber block (32) is greater than the height of the metal reinforcing sheet (31), and its upper end face slides in contact with the lower end face of the vehicle cover plate (42).

7. A novel expansion joint structure for municipal bridges to prevent thermal expansion and contraction according to claim 4, characterized in that: The upper surface of the vehicle cover plate (42) is provided with anti-slip texture or anti-slip particle layer, and the lower end surface of the vehicle cover plate (42) is provided with polytetrafluoroethylene coating.

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