A kind of small and medium-sized bridge expansion joint structure suitable for

Abstract

The utility model discloses a kind of suitable for small and medium-sized bridge expansion joint structure, belong to bridge engineering technical field, including the reserved slot of being arranged in beam slab top edge, reserved slot is equipped with anchoring assembly and subsequent cast concrete;The anchoring assembly top of expansion joint both sides is connected by elastic expansion component and is connected by elastic connecting component to the bottom of expansion joint both sides for plugging, plugging, bottom. By processing reserved slot in beam slab top edge, anchoring assembly can be installed in reserved slot, and the anchoring assembly top of expansion joint both sides is connected by elastic expansion component and realizes the plugging of expansion joint, the bottom of anchoring assembly is connected by elastic connecting component, finally again cast concrete in reserved slot is flush with the paving layer of bridge. Using the utility model can solve bridge expansion joint rubber system elastic element ageing problem, without frequently replacing, reduce maintenance cost, reduce expansion joint cleaning frequency, save maintenance manpower and material resources, increase the service life of expansion joint structure.

Description

Technical Field

[0001] This utility model belongs to the field of bridge engineering technology, and specifically relates to a structure for expansion joints suitable for small and medium-sized bridges. Background Technology

[0002] With the rapid development of my country's economy and the booming development of the transportation and logistics industry, the pressure on road and bridge maintenance is also increasing daily. Field surveys have revealed that bridge expansion joints, as one of the weakest structural components of bridges, are highly susceptible to damage under traffic loads and environmental influences, leading to water leakage or traffic safety issues, and seriously affecting the structural performance of the bridge. Furthermore, proper daily maintenance is crucial. Failure to promptly remove debris such as mud and gravel from the expansion joints will also damage their structure and normal function, failing to meet design requirements. Among the defects in bridge expansion joints, structural damage caused by the aging of rubber elastic elements is one of the most common. Rubber is highly susceptible to aging due to factors such as light, heat, and oxygen, requiring frequent replacement of rubber elastic elements, thus affecting the service life of the expansion joint structure and increasing maintenance costs.

[0003] Therefore, there is an urgent need to develop an expansion joint structure suitable for small and medium-sized bridges to solve the problems of aging of rubber elastic elements and reduce the damage to expansion joint structures caused by garbage accumulation. Utility Model Content

[0004] To address the above problems, this utility model provides a structure for expansion joints suitable for small and medium-sized bridges.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A structure for expansion joints in small and medium-sized bridges includes a pre-reserved groove and an anchoring assembly located at the top edge of the bridge beam. The pre-reserved groove is positioned along the length of the expansion joint, and the anchoring assembly is disposed within the groove. The groove also contains subsequently poured concrete. The tops of the anchoring assemblies on both sides of the expansion joint are connected by elastic expansion components to seal the expansion joint, and the bottoms of the anchoring assemblies are connected by elastic connecting components. The anchoring assembly includes a rectangular side beam, an anchoring plate, anchoring bars, and pre-reserved bars. The pre-reserved bars include... A row of spaced U-shaped bars and longitudinal bars intersecting them are arranged in a cross shape. The two free ends of the U-shaped bars are inserted into the reserved holes of the bottom beam slab of the reserved groove. The longitudinal bars are spaced apart at the bends on both sides of the closed end of the U-shaped bars. The anchoring bars are arranged in a row and are correspondingly arranged on the top of the reserved bars. The side of the anchoring bars facing the expansion joint is connected to the anchoring plate. The rectangular side beam is arranged on the top of multiple anchoring plates. The outer edges of the anchoring plates and the rectangular side beam are flush with the edge of the expansion joint. The flange of the elastic expansion component is fixedly connected to the top of the rectangular side beam.

[0006] Furthermore, the anchoring steel bars are laid horizontally, and the anchoring steel bars include a horizontal part, a vertical part and a bent part. The vertical part is fixedly connected to the anchoring plate, the horizontal part is fixedly connected to the reserved steel bars, and the bent part is arranged opposite to the vertical part.

[0007] Furthermore, the anchor plate is arranged vertically and is a right-angled trapezoidal steel plate. One corner of the anchor plate facing the expansion joint is welded and fixed to the bottom of the rectangular side beam. The bottom of one inner end of the anchor plate is welded and fixed to the vertical part of the anchoring steel bar. The horizontal part of the anchoring steel bar is welded and fixed to the reserved steel bar. There are several anchoring steel bars, which are arranged at intervals along the length of the expansion joint.

[0008] Furthermore, the elastic expansion component includes a U-shaped groove and an elastic structure within the groove. The two flanges of the U-shaped groove are fixedly connected to the rectangular side beam, and the groove of the U-shaped groove is disposed within the expansion joint. The elastic structure is filled within the groove of the U-shaped groove, and the top surface of the elastic structure is lower than the top surface of the rectangular side beam.

[0009] Furthermore, the flange width of the U-shaped groove is 30-50mm, and the height of the U-shaped groove is 70-90mm; the top surface of the elastic structure is 5mm lower than the top surface of the rectangular side beam.

[0010] Furthermore, the elastic structure uses AB-type two-component polysulfide sealant.

[0011] Furthermore, the elastic connection assembly includes two sets of fixing devices and profiled steel sheets. The profiled steel sheets are disposed within the expansion joint and are fixedly connected to the fixing devices on both sides. The fixing devices include rectangular connecting steel plates and a row of reinforcing bars inserted into the pre-reserved groove and wrapped with concrete. The reinforcing bars are arranged horizontally and one end is vertically fixed to the middle of the connecting steel plate. The other end of the reinforcing bars is provided with an upward hook. The connecting steel plates are flush with the edge of the expansion joint.

[0012] Furthermore, the thickness of the connecting steel plate is not less than 3mm; the profiled steel plate is arranged obliquely in the expansion joint, the profiled steel plate is a corrugated steel plate, and the two ends of the corrugated steel plate are welded and fixed to the connecting steel plate.

[0013] Furthermore, the concrete is UHPC concrete, and the top surface of the concrete is flush with the top surface of the bridge pavement layer.

[0014] The technological advancements achieved by this invention compared to existing technologies are as follows: This invention involves machining a pre-reserved groove at the top edge of the bridge beam, installing anchoring components within the groove, and connecting the tops of the anchoring components on both sides of the expansion joint using elastic expansion components to seal the expansion joint. The bottoms of the anchoring components are connected by elastic connecting components. Finally, concrete is poured into the pre-reserved groove until it is flush with the bridge pavement. This invention solves the problem of aging of the rubber elastic elements in bridge expansion joints, eliminating the need for frequent replacement, reducing maintenance costs, decreasing the frequency of expansion joint cleaning, saving maintenance manpower and resources, and increasing the service life of the expansion joint structure. Attached Figure Description

[0015] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0016] In the attached diagram: Figure 1 A structural schematic diagram of an expansion joint structure suitable for small and medium-sized bridges is provided for an embodiment of this utility model; Figure 2 This is a schematic diagram of the U-shaped groove in an embodiment of the present invention; Figure 3 This is a schematic diagram of the anchoring steel bar structure in an embodiment of this utility model; Figure 4 This is a schematic diagram of the fixing device in an embodiment of the present utility model; Figure 5 This is a schematic diagram of the structure of the profiled steel sheet in the embodiments of this utility model; In the picture: 00-Expansion joint; 1-Pavement layer; 2-Beam and slab; 3-Reserved groove; 4-Rectangular edge beam; 5-U-shaped groove; 501-Flange; 502-Groove; 6-Elastic structure; 7-Anchor plate; 8-Anchoring reinforcement; 801-Vertical part; 802-Horizontal part; 803-Bending part; 9-Reserved reinforcement; 901-U-shaped reinforcement; 902-Longitudinal reinforcement; 10-Fixing device; 1001-Holding reinforcement; 1002-Connecting steel plate; 11-Corrugated steel sheet; 1101-Folded edge; 1102-Wave steel sheet. Detailed Implementation

[0017] The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this utility model will be described below with reference to the accompanying drawings.

[0018] The expansion joint structure provided by this utility model is particularly suitable for straight expansion joints of small and medium-sized bridges. It is convenient and quick to assemble and construct, and has good application results. However, the expansion joints of large bridges are mostly sawtooth-shaped, and this structure is not suitable for construction within sawtooth-shaped expansion joints, therefore it is not suitable for large bridges.

[0019] like Figure 1 As shown in the figure, this utility model provides a structure for expansion joints suitable for small and medium-sized bridges, including a reserved groove 3 and an anchoring assembly set at the top edge of the bridge beam 2. The reserved groove 3 is set along the length direction of the expansion joint 00, and the anchoring assembly is set in the reserved groove 3. The reserved groove 3 is also filled with concrete to be poured later. The tops of the anchoring assemblies on both sides of the expansion joint 00 are connected by elastic expansion assemblies to seal the expansion joint, and the bottoms of the anchoring assemblies are connected by elastic connecting assemblies. The anchoring assembly includes a rectangular side beam 4, an anchoring plate 7, anchoring bars 8, and reserved bars 9. The reserved bars 9 include a row of spaced U-shaped bars 901 and longitudinal bars 902 that cross them. The two free ends of the U-shaped bars 901 are inserted into the reserved holes of the bottom beam plate 2 of the reserved groove 3. The longitudinal bars 902 are spaced apart on the inner side of the bends on both sides of the closed ends of the U-shaped bars 901. The anchoring bars 8 are arranged in a row and are correspondingly arranged on the top of the reserved bars 9. The side of the anchoring bars 8 facing the expansion joint 00 is connected to the anchoring plate 7. The rectangular side beam 4 is arranged on the top of multiple anchoring plates 7. The outer edges of the anchoring plates 7 and the rectangular side beam 4 are flush with the edge of the expansion joint 00. The flange 501 of the elastic expansion assembly is fixedly connected to the top of the rectangular side beam 4.

[0020] In the specific fabrication of the anchoring assembly, the rectangular side beam 4 is pre-welded together with the anchoring plate 7 and the anchoring bar 8, and then welded as a whole to the reserved reinforcing bar 9 via the anchoring bar 8. The anchoring assembly is symmetrically arranged on both sides of the expansion joint. At the same time, the rectangular side beam 4 must match the size of the anchoring plate 7, and the length of the anchoring bar 8 must be appropriate. The anchoring bar 8 is horizontally fixed to the top of the reserved reinforcing bar 9. The vertical part 801 of the anchoring bar 8 is welded to the anchoring plate 7, and the horizontal part 802 is welded to the longitudinal bar 902 of the reserved reinforcing bar 9. The bent part 803 on the other side of the anchoring bar 8 is set opposite to the vertical part 801 and is located outside the anchoring plate 7. The design of the bent part can increase the contact area with the concrete on the one hand, and on the other hand, the bent part can also increase the bond between the reinforcing bar and the concrete. In addition, the anchor bar 8 can also be welded in a vertical state. The vertical part 801 of the anchor bar 8 is welded to the anchor plate 7. The longitudinal bar 902 can be placed between the horizontal part 802 of the anchor bar 8 and the horizontal section of the U-shaped bar 901. The end of the bent part 803 of the anchor bar 8 can extend to the outside of the anchor plate 7 or be welded to the anchor plate 7.

[0021] In specific embodiments of this utility model, such as Figure 1 , 5As shown, the anchor plate 7 is arranged vertically and is a right-angled trapezoidal steel plate. One corner of the anchor plate 7 facing the expansion joint 00 is fixed to the bottom of the rectangular side beam 4. The bottom of the inner end of the anchor plate 7 is fixed to the vertical part 801 of the anchoring steel bar 8. The horizontal part 802 of the anchoring steel bar 8 is fixed to the reserved steel bar 9. There are several anchoring steel bars 8, which are arranged at intervals along the length of the expansion joint 00. Among them, there are several groups of anchor plates 7 and anchoring bars 9, which are evenly arranged below the rectangular side beam 4.

[0022] In specific embodiments of this utility model, such as Figure 1 , 2 As shown, the elastic expansion joint includes a U-shaped groove 5 and an elastic structure 6 within its recess 502. The two flanges 501 of the U-shaped groove 5 are fixedly connected to the rectangular side beam 4. The recess 502 of the U-shaped groove 5 is located within the expansion joint 00. The elastic structure 6 fills the recess 502 of the U-shaped groove 5, and the top surface of the elastic structure 6 is lower than the top surface of the rectangular side beam 4. To increase structural stability and adapt to bridges with high traffic volume, a full welding process is used to weld the flanges 501 to the top of the rectangular side beam 4, and the width of the flanges 501 is recommended to be 30-50mm. The recess 502 is located within the expansion joint, and to ensure the expansion and contraction deformation of the U-shaped groove 5, the height of the U-shaped groove is recommended to be 70-90mm. Simultaneously, the top surface of the elastic structure 6 is 5mm lower than the top surface of the rectangular side beam 4.

[0023] During construction, the elastic structure 6 uses AB-type two-component polysulfide sealant, with an A:B ratio of 10:1. AB-type two-component polysulfide sealant has advantages such as good integrity, durability, high elasticity, and good bonding with the U-shaped groove 5. When filled into the U-shaped groove 5, it can adapt to changes in the expansion joint. Actual performance testing shows that the two-component injection adhesive has good elasticity, excellent durability, and can bond well with the rectangular edge beam, exhibiting good structural performance. As a filling material, it forms an elastic structure within the U-shaped groove 5.

[0024] In specific embodiments of this utility model, such as Figure 1 , 3As shown in Figure 4, the elastic connection assembly includes two sets of fixing devices 10 and profiled steel plates 11. The profiled steel plates 11 are installed inside the expansion joint 00 and are fixedly connected to the fixing devices 10 on both sides. The fixing device 10 includes a rectangular connecting steel plate 1002 and a row of reinforcing bars 1001 inserted into the pre-reserved groove 3. The reinforcing bars 1001 are arranged horizontally, and one end is vertically fixed to the middle of the connecting steel plate 1002. The other end of the reinforcing bars 1001 is provided with an upward hook. The connecting steel plate 1002 is flush with the edge of the expansion joint 00. The fixing device 10 is a set of devices, evenly arranged along the length of the expansion joint. The number is set according to the width of the bridge, but should not be less than two. The reinforcing bars 1001 are connected to the connecting steel plate 1002 of appropriate length and width. One end of the reinforcing bar 1001 is firmly welded to the connecting steel plate 1002, and the other end is bent upward and inserted into the pre-reserved groove 3. The thickness of the connecting steel plate 1002 should not be less than 3mm, and the length and width should be set according to the actual size of the bridge, but should not be too small.

[0025] In specific manufacturing, the profiled steel sheet 11 is inclinedly arranged within the expansion joint 00. The profiled steel sheet 11 is a corrugated steel sheet 1102, and both ends of the corrugated steel sheet 1102 are provided with upward-facing folded edges 1101, which are welded and fixed to the connecting steel sheet 1002. When installing the profiled steel sheet 11, a front-high-back-low or front-low-back-high arrangement can be adopted to ensure that the profiled steel sheet has a certain tilt angle at the front and back, ensuring that accumulated water can flow out smoothly.

[0026] During construction, UHPC concrete was used, and its top surface was flush with the top surface of the bridge's pavement layer 1. UHPC concrete (ultra-high ductility concrete) has the characteristics of excellent bonding with asphalt pavement, good rapid hardening, and high strength. Field tests showed that UHPC concrete had the best filling effect.

[0027] The above construction steps applicable to expansion joint structures of small and medium-sized bridges are as follows: A pre-cut groove is made at the top edge of the bridge beam 2; Fixing devices for prefabricated anchoring components and flexible connection components; One end of the gripping steel bar 1001 of the fixing device is firmly welded to the connecting steel plate 1001, and the other end is bent into a hook. The gripping steel bar is then inserted into the reserved groove 3.

[0028] Then, the profiled steel sheet 11 is connected to the connecting steel plate 1001: the bent parts 1101 at both ends of the profiled steel sheet 11 are welded to the connecting steel plates 1002 on both sides of the expansion joint 00. When connecting, the front high and the back low or the front low and the back high method can be adopted to ensure that the corrugated steel sheet 1102 has a certain tilt angle at the front and back.

[0029] The rectangular side beam 4 is welded to the anchor plate 7 and the anchor steel bar 8. After welding, the anchor steel bar 8 is welded to the top of the reserved steel bar 9 for fixation.

[0030] Then, UHPC concrete is poured into the reserved groove 3, and the pouring height should be level with the pavement layer.

[0031] After the concrete strength in the reserved groove 3 meets the requirements, install the U-shaped groove 5: the bottom of the U-shaped groove 5 is placed in the expansion joint 00, and the flange 501 is welded to the rectangular side beam 4; finally, use two-component injection adhesive to fill the groove 502 to form an elastic structure 6, and the filling height should be 5mm lower than the top of the rectangular side beam 4.

[0032] In summary, this utility model uses a U-shaped channel to replace the traditional waterstop structure, offering excellent elasticity to accommodate normal bridge expansion and contraction, good durability, and avoiding the long-term replacement issues associated with aging rubber structures. Furthermore, this structure facilitates future maintenance and replacement; only the U-shaped channel needs to be replaced, without damaging the transition zone concrete, significantly reducing maintenance costs. The two-component injection adhesive used has good elasticity and durability, and integrates well with the rectangular side beams, resulting in good structural performance. As a filler material in the U-shaped channel, it greatly saves manpower, material resources, and financial resources while meeting normal structural and operational expansion and contraction requirements. This utility model also incorporates corrugated profiled steel plates with forward and backward inclinations at the bottom of the reserved channel. Firstly, the corrugated steel plates can adapt to and mitigate vertical deformation caused by the bridge; secondly, they form a barrier to prevent moisture evaporation from the lower part of the bridge from damaging the U-shaped channel, increasing the structure's applicability, especially for river-crossing bridges; and thirdly, the forward and backward inclination of the corrugated steel plates effectively guides water flow outwards, preventing water erosion of the beams.

[0033] Currently, this solution has been implemented and is showing good results. This invention solves the problem of aging of the rubber elastic elements in bridge expansion joints, eliminating the need for frequent replacements and reducing maintenance costs. The use of U-shaped grooves to cover the expansion joints reduces the frequency of cleaning, saving maintenance manpower and resources, and also extends the service life of the expansion joint structure.

[0034] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A structure for expansion joints suitable for small and medium-sized bridges, characterized in that: The system includes a pre-reserved groove and anchoring components located at the top edge of the bridge beam. The pre-reserved groove is positioned along the length of the expansion joint, and the anchoring components are located within the groove. The groove also contains subsequently poured concrete. The tops of the anchoring components on both sides of the expansion joint are connected by elastic expansion components to seal the expansion joint, and the bottoms of the anchoring components are connected by elastic connecting components. The anchoring components include a rectangular side beam, an anchoring plate, anchoring bars, and pre-reserved bars. The pre-reserved bars include a row of spaced U-shaped bars and longitudinal bars intersecting them. The two free ends of the U-shaped bars are inserted into pre-reserved holes in the bottom of the beam at the bottom of the pre-reserved groove. The longitudinal bars are spaced at the bends on both sides of the closed ends of the U-shaped bars. The anchoring bars are arranged in a row and correspondingly positioned at the top of the pre-reserved bars. The side of the anchoring bars facing the expansion joint is connected to the anchoring plate. The rectangular side beam is positioned on top of multiple anchoring plates, and the outer edges of the anchoring plates and the rectangular side beam are flush with the edge of the expansion joint. The flange of the elastic expansion component is fixedly connected to the top of the rectangular side beam.

2. The expansion joint structure for small and medium-sized bridges according to claim 1, characterized in that: The anchoring steel bars are laid horizontally, and the anchoring steel bars include a horizontal part, a vertical part and a bent part. The vertical part is fixedly connected to the anchoring plate, the horizontal part is fixedly connected to the reserved steel bars, and the bent part is arranged opposite to the vertical part.

3. A structure for expansion joints suitable for small and medium-sized bridges according to claim 2, characterized in that: The anchor plate is arranged vertically and is a right-angled trapezoidal steel plate. One corner of the anchor plate facing the expansion joint is welded and fixed to the bottom of the rectangular side beam. The bottom of one inner end of the anchor plate is welded and fixed to the vertical part of the anchoring steel bar. The horizontal part of the anchoring steel bar is welded and fixed to the reserved steel bar. There are several anchoring steel bars, which are arranged at intervals along the length of the expansion joint.

4. A structure for expansion joints suitable for small and medium-sized bridges according to claim 2, characterized in that: The elastic expansion joint includes a U-shaped groove and an elastic structure within the groove. The two flanges of the U-shaped groove are fixedly connected to a rectangular side beam, and the groove of the U-shaped groove is located within the expansion joint. The elastic structure fills the groove of the U-shaped groove, and the top surface of the elastic structure is lower than the top surface of the rectangular side beam.

5. A structure for expansion joints suitable for small and medium-sized bridges according to claim 4, characterized in that: The flange width of the U-shaped groove is 30-50mm, and the height of the U-shaped groove is 70-90mm; the top surface of the elastic structure is 5mm lower than the top surface of the rectangular side beam.

6. A structure for expansion joints suitable for small and medium-sized bridges according to claim 5, characterized in that: The elastic structure uses AB type two-component polysulfide sealant.

7. A structure for expansion joints suitable for small and medium-sized bridges according to claim 4, characterized in that: The elastic connection assembly includes two sets of fixing devices and profiled steel sheets. The profiled steel sheets are installed inside the expansion joint and are fixed to the fixing devices on both sides. The fixing devices include rectangular connecting steel plates and a row of reinforcing bars inserted into the pre-reserved groove and wrapped with concrete. The reinforcing bars are arranged horizontally and one end is vertically fixed to the middle of the connecting steel plate. The other end of the reinforcing bars is provided with an upward hook. The connecting steel plates are flush with the edge of the expansion joint.

8. A structure for expansion joints suitable for small and medium-sized bridges according to claim 7, characterized in that: The thickness of the connecting steel plate is not less than 3mm; the profiled steel plate is arranged obliquely in the expansion joint, the profiled steel plate is a corrugated steel plate, and the two ends of the corrugated steel plate are welded and fixed to the connecting steel plate.

9. A structure for expansion joints suitable for small and medium-sized bridges according to claim 2, characterized in that: The concrete used is UHPC concrete, and the top surface of the concrete is flush with the top surface of the bridge pavement layer.

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