Comb plate bridge expansion joint device capable of accurately controlling joint width and integrally anchoring

Abstract

The utility model provides a comb plate bridge expansion joint device capable of accurately controlling joint width and integrally anchoring, which comprises comb plate systems arranged on bridge ends on two sides of an expansion joint, and post-cast concrete layers are arranged between the comb plate systems and the bridge ends. The comb plate system comprises a comb plate, a damping rubber plate and a flat steel plate which are sequentially arranged from top to bottom, the comb plate, the damping rubber plate and the flat steel plate are fixed together through anchoring bolts and anchoring nuts, and an anchoring assembly is arranged at the bottom of the flat steel plate, extends into the post-pouring concrete layer and is integrally poured with the post-pouring concrete layer. And the comb plates of the two comb plate systems are meshed with each other. The problem that an existing screw anchoring type comb plate bridge expansion joint is short in service life is solved.

Description

Technical Field

[0001] This utility model belongs to the field of expansion joint technology, and in particular relates to a comb-tooth plate bridge expansion joint device that can accurately control the joint width and achieve overall anchoring. Background Technology

[0002] Screw-anchored comb-plate bridge expansion joints are a commonly used type of expansion joint. The anchor bolts of the comb plate are directly welded to the pre-embedded steel reinforcement of the bridge. This structure has two problems: First, the number of anchor bolts welded to the pre-embedded steel reinforcement is small, and the weld quality cannot be guaranteed. The welded points are prone to detachment, leading to frequent loosening of the anchor bolts and causing the comb plate to loosen, resulting in significant noise from passing vehicles and even causing the entire comb plate to detach. Second, the impact load from vehicles on the comb plate is transmitted to the anchor bolts, which in turn transmit the load directly to the surrounding concrete. Due to the large impact load, excessive local stress occurs in the concrete around the anchor bolts. Under prolonged and repeated vehicle impact loads, the concrete around the anchor bolts is prone to cracking and damage, leading to the failure of the expansion joint. Therefore, based on current usage, screw-anchored comb-plate bridge expansion joints rarely reach their designed service life. Many bridges develop various forms of damage to their expansion joints within one year of opening to traffic, and most require repair or replacement within 3-4 years. Once a bridge is opened to traffic, the maintenance costs are enormous each time, especially for highways. Not only do they incur huge maintenance expenses, but they also pose a significant safety hazard to passing vehicles. Utility Model Content

[0003] The purpose of this invention is to provide a comb-plate bridge expansion joint device that can precisely control the joint width and achieve overall anchoring, thereby solving the problems existing in the current screw-anchored comb-plate bridge expansion joint.

[0004] This utility model is achieved through the following technical solution:

[0005] A comb-plate bridge expansion joint device capable of precisely controlling joint width and providing overall anchoring includes a comb-plate system installed on both sides of the bridge end of the expansion joint. A post-cast concrete layer is provided between the comb-plate system and the bridge end. The comb-plate system includes a comb plate, a shock-absorbing rubber plate, and a flat steel plate arranged sequentially from top to bottom. The comb plate, the shock-absorbing rubber plate, and the flat steel plate are fixed together by anchor bolts and anchor nuts. An anchoring component is provided at the bottom of the flat steel plate. The anchoring component extends into the post-cast concrete layer and is cast integrally with the post-cast concrete layer. The comb plates of the two comb-plate systems are interlocked.

[0006] Furthermore, multiple steel brackets are provided at the bottom of one end of the flat steel plate near the expansion joint. The multiple steel brackets are spaced apart along the length of the flat steel plate and are inserted into the post-poured concrete layer.

[0007] Furthermore, the anchoring assembly includes multiple anchoring bars, the top of which is fixed to the bottom of the flat steel plate.

[0008] Furthermore, multiple process holes are provided on the flat steel plate.

[0009] Furthermore, pre-embedded steel reinforcement components are provided within the post-cast concrete layer.

[0010] Furthermore, the flat steel plate has a first through hole, the shock-absorbing rubber plate has a second through hole, and the comb plate has a third and a fourth through hole. The fourth through hole is located above the third through hole and communicates with the third through hole. The anchor nut is set in the fourth through hole, the nut head of the anchor bolt is fixed to the bottom of the flat steel plate, and the bolt of the anchor bolt passes through the first through hole, the second through hole and the third through hole in sequence and is threadedly connected to the anchor nut.

[0011] Furthermore, the anchor nut is an anti-loosening nut.

[0012] Compared to existing technologies, the beneficial effects of this utility model are as follows: Adding a shock-absorbing rubber plate ensures surface contact between the comb plate and the flat steel plate. When transmitting impact loads, this absorbs energy and distributes the impact load energy evenly, reducing stress concentration. Especially for the anchor bolts, which only bear a small residual load, their primary function is to fix the comb plate to the flat steel plate, preventing the comb plate from loosening due to loose anchor bolts. Since the flat steel plate is a single unit, when receiving impact loads, the impact load is evenly distributed to all anchoring components of the entire flat steel plate, significantly reducing the impact load on the concrete at each anchoring component, thus solving the problem of stress concentration caused by stress concentration in the concrete surrounding the anchoring components. The problem of stress concentration and damage due to excessive stress is addressed by protecting the concrete at the bridge ends from damage and extending its service life. The difference in gap width between the two ends of the bridge is a common quality defect that is difficult to completely eliminate during construction. Installing steel brackets at the front end of the flat steel plate allows for precise control of the gap width at the beam ends, ensuring the comb plate system operates within the set technical boundaries and eliminating various hidden dangers caused by excessive gap width at the beam ends. The flat steel plate is embedded entirely at the bridge end, making it less prone to damage compared to the damping rubber plate. Furthermore, the comb plate, damping rubber plate, and flat steel plate are fixed together with anchor bolts and nuts, facilitating replacement of the damping rubber plate after damage without requiring destructive repairs, thus reducing maintenance costs. Attached Figure Description

[0013] Figure 1 This is an elevation view of the comb-tooth plate bridge expansion joint device of this utility model, which can accurately control the joint width and achieve overall anchoring.

[0014] Figure 2 This is a top view of the flat steel plate in the comb-tooth plate bridge expansion joint device of this utility model, which can accurately control the joint width and achieve overall anchoring.

[0015] Figure 3 This is a schematic diagram of the connection between the flat steel plate and the steel bracket in the comb-tooth plate bridge expansion joint device of this utility model, which can accurately control the joint width and achieve overall anchoring.

[0016] Figure 4 This is a schematic diagram showing the connection between the flat steel plate and the anchoring components in the comb-tooth plate bridge expansion joint device of this utility model, which can accurately control the joint width and achieve overall anchoring.

[0017] Figure 5 This is a schematic diagram showing the arrangement of the rear anchor bars and pre-embedded anchor bars in the comb-plate bridge expansion joint device of this utility model, which can accurately control the joint width and achieve overall anchoring.

[0018] In the figure, 1-beam end centerline, 2-bridge end, 3-post-cast concrete layer, 4-comb plate, 5-shock-absorbing rubber plate, 6-flat steel plate, 7-anchor bolt, 8-anchor nut, 9-anchor reinforcement, 10-steel bracket, 11-post-anchor reinforcement, 12-pre-embedded anchor reinforcement, 13-process hole. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0021] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this utility model, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0022] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0023] In the description of this utility model, it should be noted that the terms "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are 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.

[0024] Please see Figure 1 and Figure 2 , Figure 1 This is an elevation view of the comb-tooth plate bridge expansion joint device of this utility model, which can precisely control the joint width and achieve overall anchoring. Figure 2 This is a top view of the flat steel plate in the comb-plate bridge expansion joint device of this utility model, which can precisely control the joint width and achieve overall anchoring. A comb-plate bridge expansion joint device capable of precisely controlling the joint width and achieving overall anchoring includes a comb-plate system installed on both sides of the bridge end 2 of the expansion joint. A post-cast concrete layer 3 is provided between the comb-plate system and the bridge end 2. The comb-plate system includes a comb-plate 4, a shock-absorbing rubber plate 5, and a flat steel plate 6 arranged sequentially from top to bottom. The comb-plate 4, the shock-absorbing rubber plate 5, and the flat steel plate 6 are fixed together by anchor bolts 7 and anchor nuts 8. An anchoring component is provided at the bottom of the flat steel plate 6, extending into the post-cast concrete layer 3 and being cast integrally with it. The comb-plates 4 of the two comb-plate systems are interlocked.

[0025] A damping rubber plate 5 and a flat steel plate 6 are installed below the comb plate 4. The damping rubber plate 5 has good elasticity, energy absorption performance, and shear resistance, allowing the comb plate 4 and the flat steel plate 6 to make surface contact. When transmitting impact loads, the damping rubber plate 5 can absorb energy and evenly transmit the impact load energy, reducing stress concentration. Especially for the anchor bolts 7, they only bear a small residual load, and their main function is to fix the comb plate 4 and the flat steel plate 6, preventing the anchor bolts 7 from loosening and thus preventing the comb plate 4 from loosening. Since the flat steel plate 6 is a whole, when it receives impact loads, it evenly distributes the impact load to all anchor components of the entire flat steel plate 6, significantly reducing the impact load on the concrete at each anchor component. This solves the problem of damage caused by excessive stress concentration in the concrete around the anchor components, protecting the concrete at the bridge end 2 from damage and extending its service life. The flat steel plate 6 is embedded in the bridge end 2, which is less prone to damage than the damping rubber plate 5. The comb plate 4, the damping rubber plate 5 and the flat steel plate 6 are fixed together by anchor bolts 7 and anchor nuts 8, which makes it easy to replace the damping rubber plate 4 after it is damaged, without the need for damaging repairs, thus reducing maintenance costs.

[0026] Please refer to the following: Figure 3 , Figure 3 This is a schematic diagram showing the connection between the flat steel plate and the steel brackets in the comb-plate bridge expansion joint device of this utility model, which can precisely control the joint width and achieve overall anchoring. In actual construction, it is difficult to achieve a standard width for the expansion joint. If the joint width is too large, the cantilever end of the comb plate 4 will be too long, preventing the comb plate system from operating under the set boundary conditions, leading to damage to the comb plate system. Furthermore, the excessive joint width also causes excessive reaction force on the rear anchorage of the comb plate, accelerating concrete damage. To solve these problems, in one embodiment, multiple steel brackets 10 are provided at the bottom of the flat steel plate 6 near the expansion joint. These steel brackets 10 are spaced apart along the length of the flat steel plate 6 and inserted into the post-cast concrete layer 3. The steel brackets 10 at the bottom of the flat steel plate 6 enhance the bending resistance of the flat steel plate 6 near the expansion joint. In cases where the beam end width is inconsistent, the entire comb plate system can be moved towards the beam end centerline 1, ensuring a consistent working cantilever length of the comb plate 4 and precisely controlling the joint width. Figure 1As shown, this invention addresses the problem of excessive width at the bridge ends caused by quality control issues during bridge construction. This results in a more effective and precise comb-plate bridge expansion joint device with overall anchorage, ensuring the comb-plate expansion joint operates within its set technical parameters. This eliminates various hidden dangers caused by excessive beam end joint width, extends service life, and reduces the anchorage reaction force by not increasing the cantilever end bending moment, thus preventing concrete damage. When the comb-plate system moves towards the beam end centerline 1, a gap exists between the end of the comb-plate system away from the expansion joint 1 and the bridge end 2. A post-cast concrete layer 3 is also installed within this gap.

[0027] Please refer to the following: Figure 4 , Figure 4 This is a schematic diagram showing the connection between the flat steel plate and the anchoring component in the comb-plate bridge expansion joint device of this utility model, which enables precise control of joint width and overall anchoring. In one embodiment, the anchoring component includes multiple anchoring steel bars 9, the top ends of which are fixed to the bottom of the flat steel plate 6. The anchoring steel bars 9 can be divided into two rows, with the two rows of anchoring steel bars 9 spaced apart along the width direction of the flat steel plate 6, so that the flat steel plate 6 can be stably fixed to the post-cast concrete layer 3. In one embodiment, multiple process holes 13 are provided on the flat steel plate 6. The process holes 13 allow concrete to seep out, making the post-cast concrete layer 3 more compact.

[0028] Please refer to the following: Figure 5 , Figure 5 This is a schematic diagram illustrating the arrangement of the post-anchor bars and pre-embedded anchor bars in the comb-plate bridge expansion joint device of this utility model, which enables precise control of joint width and overall anchoring. In one embodiment, a pre-embedded steel reinforcement assembly is provided within the post-cast concrete layer 3. The pre-embedded steel reinforcement assembly enhances the load-bearing capacity of the post-cast concrete layer 3. In one embodiment, the pre-embedded steel reinforcement assembly includes multiple post-anchor bars 11 and multiple pre-embedded anchor bars 12. The multiple post-anchor bars 11 are spaced apart along the width direction of the post-cast concrete layer 3, and the multiple pre-embedded anchor bars 12 are spaced apart along the length direction of the post-cast concrete. The pre-embedded anchor bars 12 are fixedly connected to the multiple post-anchor bars 11, and both ends of the pre-embedded anchor bars 12 extend out of the post-cast concrete layer 3 and insert into the bridge end 2. This arrangement enhances the load-bearing capacity of the post-cast concrete layer 3 while making the connection between the post-cast concrete and the bridge end 2 more stable. Furthermore, the pre-embedded anchor bars 12 are U-shaped, including a first vertical bar, a horizontal bar, and a second vertical bar connected in sequence. The horizontal bar is fixedly connected to multiple post-anchor bars 11. The bottom end of the first vertical bar extends from the post-cast concrete layer 3 and inserts into the bridge end 2. One end of the horizontal bar connected to the second vertical bar extends from the post-cast concrete layer 3 and inserts into the bridge end 2. The second vertical bar is located inside the bridge end 2. In one embodiment, to facilitate the passage of multiple post-anchor bars 11, the anchor bars 9 are set in a rectangular frame shape, and through holes are provided on the steel bracket 10.

[0029] In one embodiment, the flat steel plate 6 has a first through hole, the shock-absorbing rubber plate 5 has a second through hole, and the comb plate 4 has a third and a fourth through hole. The fourth through hole is located above and communicates with the third through hole. The anchoring nut 8 is disposed in the fourth through hole, and the nut head of the anchoring bolt 7 is fixed to the bottom of the flat steel plate 6. The bolt of the anchoring bolt 7 passes through the first, second, and third through holes in sequence and is threadedly connected to the anchoring nut 8. The nut head of the anchoring bolt 7 is turned upside down on the bottom of the flat steel plate 6 and welded for fixation. Then, the anchoring nut 8 is used to fix the comb plate 4, the shock-absorbing rubber plate 5, and the flat steel plate 6 together to prevent the anchoring bolt 7 and the comb plate 4 from loosening. In one embodiment, the anchoring nut 8 is an anti-loosening nut. The anti-loosening nut has excellent vibration resistance, wear resistance, strong shear resistance, and good reusability. It can maintain its original locking effect after repeated tightening and loosening. In addition, the anti-loosening nut also has good sealing performance.

[0030] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Therefore, any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the content of the technical solution of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A comb plate bridge expansion joint device capable of precisely controlling the joint width and overall anchoring, characterized in that, The utility model provides a bridge end head structure of expansion joint, which comprises a comb plate system arranged on the bridge end head on both sides of the expansion joint, a post-cast concrete layer arranged between the comb plate system and the bridge end head, and a comb plate, a shock-absorbing rubber plate and a flat steel plate arranged in sequence from top to bottom in the comb plate system.

2. The controlled gap, integral anchor, comb plate joint device of claim 1, wherein, The flat steel plate is provided with a plurality of steel corbels at the bottom of one end close to the expansion joint, and the steel corbels are arranged at intervals along the length direction of the flat steel plate and are inserted into the post-cast concrete layer.

3. The controlled gap, integral anchor, comb plate joint device of claim 1, wherein, The anchoring assembly comprises a plurality of anchoring steel bars, and the top ends of the anchoring steel bars are fixed to the bottom of the flat steel plate.

4. The controlled gap, integral anchor, comb plate joint device of claim 1, wherein, A plurality of process holes are formed in the flat steel plate.

5. The controlled gap, integral anchor, comb plate joint device of claim 1, wherein, The post-cast concrete layer is provided with a pre-embedded steel bar assembly.

6. The controlled gap, integral anchor, comb plate joint device of claim 1, wherein, The flat steel plate is provided with a first through hole, the shock-absorbing rubber plate is provided with a second through hole, the comb plate is provided with a third through hole and a fourth through hole, the fourth through hole is located above the third through hole and communicates with the third through hole, the anchoring nut is arranged in the fourth through hole, the nut head of the anchoring bolt is fixed to the bottom of the flat steel plate, and the screw rod of the anchoring bolt is sequentially threaded through the first through hole, the second through hole and the third through hole and is threadedly connected with the anchoring nut.

7. The controlled-width, integrally anchored, comb plate joint apparatus of claim 6, wherein, The anchoring nut is a locknut.

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