Fabricated bridge expansion device anchoring structure and construction technology

Abstract

The invention belongs to the technical field of bridge construction, and discloses a fabricated bridge expansion device anchoring structure and a construction technology, the fabricated bridge expansion device anchoring structure comprises a first beam body and a second beam body, the first beam body and the second beam body are respectively provided with a mounting groove, the top of each mounting groove is connected with a plurality of connecting pieces, and the outer sides of the plurality of connecting pieces on the same side share an expansion joint structure; the connecting pieces comprise bottom plates and high-strength bolts, the bottom plates are connected with side plates, bolt holes are formed in the bottom plates, steel bar holes are formed in the side plates, transverse steel bars are slidably connected to the inner walls of the steel bar holes, and the first beam body and the second beam body are each provided with a plurality of mounting holes. The connecting pieces are fixedly connected with the corresponding first beam body and second beam body through the mounting holes and high-strength bolts, and the high-strength bolts are in threaded connection with nuts. According to the method, only the thin asphalt concrete surface layer needs to be cut off, the main body structure of the bridge cannot be damaged, mechanical anchoring is conducted through the connecting pieces and the high-strength bolts, and rapid and reliable connection between the expansion joint structure and the bridge structure is achieved.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, and in particular to an anchoring structure and construction process for a prefabricated bridge expansion joint. Background Technology

[0002] Bridge expansion joints are typically installed between beam ends, between beam ends and abutments, or at the hinged joints of the bridge. They can accommodate and release longitudinal displacement and deformation of the bridge structure caused by factors such as temperature changes, concrete shrinkage and creep, vehicle loads, and earthquakes, thereby effectively protecting the main bridge structure from damage and ensuring smooth and safe driving.

[0003] Currently, bridge expansion joints commonly employ the traditional installation method of pre-reserving slots and embedding reinforcing bars at the beam ends and abutment back walls. This method increases structural complexity and construction costs during the design phase. During construction, to ensure the continuous and smooth asphalt paving of the bridge deck, the pre-reserved slots need to be temporarily filled. Subsequent installation requires cutting and chiseling, which is not only cumbersome and wasteful of materials, generating a large amount of construction waste, but also consumes significant amounts of machinery and manpower, and causes noise and dust pollution. Furthermore, the chiseling process easily damages the top slab of the beam and the embedded reinforcing bars, posing a potential threat to the long-term safety and durability of the bridge. Summary of the Invention

[0004] The present invention aims to provide an anchoring structure and construction process for prefabricated bridge expansion joints to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: In a first aspect, this application provides an anchoring structure for a prefabricated bridge expansion joint, including a first beam and a second beam. The first beam and the second beam are respectively provided with an installation groove. A plurality of connectors are connected to the top of the installation groove. The connectors are perpendicular to the length direction of the expansion joint. The outer sides of the plurality of connectors on the same side share the expansion joint structure. The connector includes a base plate and high-strength bolts. The base plate is connected to a side plate. The base plate has bolt holes, and the side plates have reinforcing bar holes. Transverse reinforcing bars are slidably connected to the inner wall of the reinforcing bar holes. The first beam and the second beam each have a number of mounting holes. A number of the connectors are fixedly connected to the corresponding first beam and second beam respectively through the mounting holes and high-strength bolts. The high-strength bolts are threaded with nuts, and washers are provided between the nuts and the base plate.

[0006] Preferably, the expansion joint structure includes steel profiles, which are connected to connectors, and two steel profiles are connected together by a waterstop.

[0007] Preferably, the expansion joint structure includes a first dustproof plate, which is connected to a plurality of connectors on the same side. The plurality of connectors on the same side are connected to a comb plate. The comb plate is provided with teeth, and two teeth are arranged alternately. Two connectors are connected to a waterstop strip, and the connectors are connected to a dustproof structure.

[0008] Preferably, the dustproof structure includes a second dustproof plate, and several connectors on the same side are connected to the first dustproof plate. The second dustproof plate is slidably connected to two first dustproof plates respectively, and the second dustproof plate is slidably connected to the comb plate. The first dustproof plate has several evenly arranged first staggered holes, and the second dustproof plate has several evenly arranged second staggered holes on both sides respectively. The first staggered holes and the second staggered holes are arranged alternately.

[0009] Preferably, a high-performance mortar layer is provided between the connector and the first beam.

[0010] Preferably, the top of the connector is provided with a crack-resistant steel mesh, and the mounting groove is filled with high-performance early-strength concrete.

[0011] In a second aspect, this application provides a construction process for the anchorage structure of a prefabricated bridge expansion joint, comprising the following steps: S1: Draw the installation edge line of the expansion joint structure to both sides according to the design width from the center line of the gap between the first beam and the second beam. Then cut the asphalt concrete along the edge line and clean the asphalt concrete in the expansion joint installation area to form the installation groove. S2: Check the spacing between the guardrail bases at the ends of the first and second beams and the length of the expansion joint. If the spacing between the guardrail bases does not match the length of the expansion joint, a portion of the guardrail bases needs to be removed appropriately, while ensuring that the removal depth or gap between the guardrail bases at both ends is consistent. S3: Hoist the expansion joint structure into the installation slot, making the expansion joint structure parallel to the length direction of the expansion joint. Adjust the position of the expansion joint structure along the longitudinal direction of the bridge so that the center line of the expansion joint structure is consistent with the center line of the first beam and the second beam. Mark the position of the installation hole according to the bolt hole, and then move it away from the expansion joint structure. S4: Drill holes, clean holes, and install high-strength bolts according to the marked positions; S5: Apply a high-performance mortar layer to the bottom of the installation groove, with a thickness 2mm higher than the bottom surface of the anchoring structure; S6: Hoist the expansion joint structure, align the bolt holes on the connectors with the high-strength bolts, adjust the height of the expansion joint structure to align it with the finished surface of the bridge deck, then install the gaskets and nuts, and tighten the nuts according to the design requirements.

[0012] S7: Pour high-performance early-strength concrete to 3cm from the finished surface of the bridge deck, then lay anti-crack steel mesh, and continue pouring high-performance early-strength concrete to the height of the finished surface of the bridge deck.

[0013] S8: Repair the removed portion of the guardrail edge at the expansion joint.

[0014] S9: Cover and cure the concrete construction area with a cloth or steam. Once the concrete strength reaches the design strength, open the road to traffic.

[0015] Preferably, the method further includes the following steps: S7a: Pass the transverse reinforcing bars through several reinforcing bar holes in sequence and weld the transverse reinforcing bars to the connectors for fixation.

[0016] Preferably, the method further includes the following steps: S2a: Fix the waterstop strip on both sides to the side walls of the first beam and the second beam.

[0017] The beneficial effects of this technical solution compared to existing technologies are as follows: This invention requires only the removal of a thin layer of asphalt concrete, without damaging the main bridge structure. Mechanical anchoring using connectors and high-strength bolts enables a rapid and reliable connection between the expansion joint structure and the bridge structure. This process eliminates the cumbersome steps of pre-embedded reinforcing bars, temporary filling, and secondary removal required in traditional methods, simplifying the process and avoiding damage to the beam structure and pre-embedded reinforcing bars caused by removal operations. It also reduces construction waste, noise, and dust pollution, offering significant advantages such as high construction efficiency, environmental friendliness, energy conservation, and effective protection of the bridge's main structural integrity. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the steel profile provided by the present invention; Figure 2 The longitudinal section view of the steel profile provided for this invention; Figure 3 This is a schematic diagram of the steel structure provided by the present invention; Figure 4 This is a schematic diagram of the comb plate provided by the present invention; Figure 5 This is a longitudinal sectional view of the comb plate provided by the present invention; Figure 6 This is a schematic diagram of the comb plate structure provided by the present invention; Figure 7 A schematic diagram of the dustproof structure provided by the present invention; Figure 8 This is a schematic diagram of the connector structure provided by the present invention; Reference numerals: 1. First beam; 2. Second beam; 3. Mounting groove; 4. Connector; 5. Steel section; 6. Waterstop; 7. Transverse reinforcement; 8. Crack-resistant steel mesh; 9. Mounting hole; 10. High-strength bolt; 11. Washer; 12. Nut; 13. High-performance early-strength concrete; 14. High-performance mortar layer; 15. First dustproof plate; 16. Second dustproof plate; 17. Comb plate; 18. First misaligned hole; 19. Second misaligned hole; 20. Toothed part; 21. Base plate; 22. Bolt hole; 23. Reinforcing bar hole; 24. Side plate; Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments: like Figures 1 to 8 The prefabricated bridge expansion joint anchoring structure shown includes a first beam 1 and a second beam 2, as follows: Figure 1 As shown, the asphalt concrete on the top surface of the first beam 1 and the second beam 2 near the expansion joint is cut to form an installation groove 3. Several connectors 4 are connected to the top of the installation groove 3. The connectors 4 are arranged perpendicular to the length direction of the expansion joint and, through their own structure, serve as a prefabricated anchoring core, providing a stable mechanical connection and force transmission foundation for the main body of the expansion joint. Several connectors 4 on the same side, near the expansion joint, are connected to the main structure of the expansion joint to integrate and transmit vehicle loads and accommodate beam displacement.

[0020] like Figure 2 and 8 As shown, the connector 4 includes a base plate 21 and high-strength bolts 10. Side plates 24 are connected to both sides of the base plate 21. The base plate 21 has bolt holes 22, and the two side plates 24 have corresponding rebar holes 23. A transverse rebar 7 is slidably connected to the inner walls of several rebar holes 23. The transverse rebar 7 can pass through the side plates 24 of each connector 4, connecting all connectors 4 on the same side into a single unit. This unit works in conjunction with the subsequently poured concrete to enhance the integrity and pull-out resistance of the anchoring system. Figure 2 As shown, the first beam 1 and the second beam 2 each have several evenly arranged mounting holes 9. Several connectors 4 are fixedly connected to the corresponding first beam 1 and second beam 2 through the mounting holes 9 and high-strength bolts 10. The strong mechanical gripping force provided by the high-strength bolts 10 achieves direct and reliable anchoring between the connectors 4 and the beam, replacing the traditional easily damaged method of welding pre-embedded steel bars. A nut 12 is threaded onto the top of the high-strength bolt 10, and a washer 11 is provided between the nut 12 and the base plate 21.

[0021] Example 1 like Figure 1-3 ,like Figure 2As shown, the expansion joint structure includes F-shaped steel sections 5, which are connected to connectors 4. Two steel sections 5 are connected together by a waterstop 6. The steel sections 5 withstand the direct impact of vehicles and beam displacement, while the waterstop 6 effectively prevents rainwater and debris from seeping in, protecting the underlying structure.

[0022] Example 2 like Figure 4-7 ,like Figure 5 As shown, the expansion joint structure includes two first dustproof plates 15, each of which is connected to several connectors 4 on the same side. The tops of these connectors 4 are connected to a comb-tooth plate 17. Figure 6 As shown, the comb plate 17 has toothed sections 20, with two toothed sections 20 arranged in an alternating pattern to provide a continuous and smooth driving interface for the vehicle, while allowing the beam to extend and retract freely. Two connectors 4 are connected to a waterstop 6 on one side of each other, and the connectors 4 are connected to a dustproof structure located on top of the waterstop 6.

[0023] The dustproof structure includes a second dustproof plate 16, and several connectors 4 on the same side are connected to a first dustproof plate 15 at their tops. The second dustproof plate 16 is slidably connected to two of the first dustproof plates 15, and the top of the second dustproof plate 16 is slidably connected to two comb plates 17. By utilizing the sliding fit between the multiple layers of dustproof plates, multiple physical barriers are formed while allowing for expansion and contraction. Figure 7 As shown, the two first dustproof plates 15 are provided with a number of evenly arranged first staggered holes 18 on one side close to each other, and the two sides of the second dustproof plate 16 are provided with a number of evenly arranged second staggered holes 19. The first staggered holes 18 and the second staggered holes 19 are arranged alternately. The staggered hole design can effectively prevent sand, gravel, garbage and other debris from falling into the gap, prevent blockage and reduce maintenance needs.

[0024] like Figure 2 As shown, a high-performance mortar layer 14 is provided between the connector 4 and the first beam 1. Its function is to fill and level the contact surface, ensure uniform load transfer, and provide good adhesion and corrosion protection.

[0025] like Figure 2 As shown, the top of the connector 4 is provided with a crack-resistant steel mesh 8, and the installation groove 3 is filled with high-performance early-strength concrete 13. The high-performance early-strength concrete 13 quickly forms a high-strength anchor body, which wraps the connector 4, transverse steel bars 7 and other components into a whole. The crack-resistant steel mesh 8 effectively inhibits shrinkage cracks on the concrete surface, together forming a durable and strong anchoring area to ensure the performance of the expansion joint under long-term dynamic load.

[0026] When using the above-mentioned prefabricated bridge expansion joint anchoring structure, the following steps are required: S1: Draw the installation edge line of the expansion joint structure to both sides according to the design width from the center line of the gap between the first beam 1 and the second beam 2. Then cut the asphalt concrete along the edge line and clean the asphalt concrete in the expansion joint installation area to form the installation groove 3. S2: Check the spacing between the guardrail bases at the ends of the first beam 1 and the second beam 2 and the length of the expansion joint. If the spacing between the guardrail bases does not match the length of the expansion joint, a portion of the guardrail bases needs to be removed appropriately, while keeping the removal depth or gap of the guardrail bases at both ends consistent. S3: Hoist the expansion joint structure into the installation slot 3, making the expansion joint structure parallel to the length direction of the expansion joint. Adjust the position of the expansion joint structure along the longitudinal direction of the bridge so that the center line of the expansion joint structure is consistent with the center line of the first beam 1 and the second beam 2. Mark the position of the installation hole 9 according to the bolt hole 22, and then move it away from the expansion joint structure. S4: Drill holes, clean holes, and install 10 high-strength bolts at the marked locations; S5: Apply a high-performance mortar layer 14 to the bottom of the mounting groove 3, with a thickness 2mm higher than the bottom surface of the anchoring structure, to provide a flat and stable support base for the upper structure. S6: Hoist the expansion joint structure, align the bolt hole 22 on the connector 4 with the high-strength bolt 10, adjust the height of the expansion joint structure to align it with the finished surface of the bridge deck, then install the gasket 11 and nut 12, tighten the nut 12 according to the design requirements, and complete the mechanical anchoring.

[0027] S7: Pour high-performance early-strength concrete 13 to a distance of 3cm from the finished surface of the bridge deck, then lay anti-crack steel mesh 8, and continue to pour high-performance early-strength concrete 13 to the height of the finished surface of the bridge deck. The final structural load-bearing body is quickly formed through high-performance concrete.

[0028] S8: Repair the removed portion of the guardrail edge at the expansion joint.

[0029] S9: Cover and cure the construction area with a cloth or steam. Once the concrete strength reaches the design strength, open the road to traffic.

[0030] When using the above two expansion joint structures, step S7a can be added between S6 and S7: the transverse steel bar 7 is passed through several steel bar holes 23 in sequence and the transverse steel bar 7 is welded and fixed to the connector 4, which further enhances the integrity between the connectors and improves the cooperative stress performance of the anchoring system.

[0031] When using the above-mentioned comb-tooth plate type expansion joint structure, step S2a needs to be added between S1 and S2: the waterstop 6 is fixedly installed on both sides of the first beam 1 and the side wall of the second beam 2 to pre-establish a reliable waterproof barrier and prevent water and impurities from entering the beam joint during subsequent construction.

[0032] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. An anchoring structure for a prefabricated bridge expansion joint, characterized in that: It includes a first beam (1) and a second beam (2). The first beam (1) and the second beam (2) are respectively provided with mounting grooves (3). Several connectors (4) are connected to the top of the mounting grooves (3). The connectors (4) are perpendicular to the length direction of the expansion joint. Several connectors (4) on the same side share the expansion joint structure on the outside. The connector (4) includes a base plate (21) and a high-strength bolt (10). The base plate (21) is connected to a side plate (24). The base plate (21) has bolt holes (22). The side plate (24) has reinforcing bar holes (23). The inner wall of the reinforcing bar holes (23) is slidably connected with transverse reinforcing bars (7). The first beam (1) and the second beam (2) are respectively provided with a number of mounting holes (9). A number of the connectors (4) are fixedly connected to the corresponding first beam (1) and second beam (2) through the mounting holes (9) and the high-strength bolts (10). The high-strength bolts (10) are threaded with nuts (12). A washer (11) is provided between the nut (12) and the base plate (21).

2. The prefabricated bridge expansion joint anchoring structure as described in claim 1, characterized in that: The expansion joint structure includes a steel section (5), which is connected to a connector (4), and two steel sections (5) are connected together to a waterstop (6).

3. The prefabricated bridge expansion joint anchoring structure as described in claim 1, characterized in that: The expansion joint structure includes a first dustproof plate (15), which is connected to several connectors (4) on the same side. Several connectors (4) on the same side are connected to a comb plate (17). The comb plate (17) is provided with teeth (20). Two teeth (20) are arranged alternately. Two connectors (4) are connected to a waterstop (6). The connectors (4) are connected to a dustproof structure.

4. The prefabricated bridge expansion joint anchoring structure as described in claim 3, characterized in that: The dustproof structure includes a second dustproof plate (16), and several connectors (4) on the same side are connected to a first dustproof plate (15). The second dustproof plate (16) is slidably connected to two first dustproof plates (15) respectively. The second dustproof plate (16) is slidably connected to a comb plate (17). The first dustproof plate (15) has several evenly arranged first misaligned holes (18). The second dustproof plate (16) has several evenly arranged second misaligned holes (19) on both sides respectively. The first misaligned holes (18) and the second misaligned holes (19) are arranged alternately.

5. The prefabricated bridge expansion joint anchoring structure as described in claim 1, characterized in that: A high-performance mortar layer (14) is provided between the connector (4) and the first beam (1).

6. The prefabricated bridge expansion joint anchoring structure as described in claim 1, characterized in that: The connector (4) is provided with a crack-resistant steel mesh (8) on the top, and the installation groove (3) is filled with high-performance early-strength concrete (13).

7. A construction process for an anchorage structure of a prefabricated bridge expansion joint, applied to an anchorage structure as described in any one of claims 1 to 6, characterized in that: Includes the following steps, S1: Draw the expansion joint structure installation edge line on both sides according to the design width from the center line of the gap between the first beam (1) and the second beam (2), then cut the asphalt concrete along the edge line, clean the asphalt concrete in the expansion joint installation area, and form the installation groove (3). S2: Check the spacing between the guardrail bases at the ends of the first beam (1) and the second beam (2) and the length of the expansion joint. If the spacing between the guardrail bases does not match the length of the expansion joint, a portion of the guardrail bases should be removed appropriately, while keeping the removal depth or gap of the guardrail bases at both ends consistent. S3: Hoist the expansion joint structure into the installation slot (3) so that the expansion joint structure is parallel to the length direction of the expansion joint. Adjust the position of the expansion joint structure along the longitudinal direction of the bridge so that the center line of the expansion joint structure is consistent with the center line of the first beam (1) and the second beam (2). Mark the position of the installation hole (9) according to the bolt hole (22), and then hoist the expansion joint structure away. S4: Drill holes, clean holes and install high-strength bolts (10) according to the marked positions; S5: Apply a high-performance mortar layer (14) to the bottom of the installation groove (3), with a thickness 2mm higher than the bottom surface of the anchoring structure; S6: Hoist the expansion joint structure, align the bolt hole (22) on the connector (4) with the high-strength bolt (10), adjust the height of the expansion joint structure to align with the finished surface of the bridge deck, and then install the gasket (11) and nut (12), and tighten the nut (12) according to the design requirements. S7: Pour high-performance early-strength concrete (13) to 3cm from the finished surface of the bridge deck, then lay anti-crack steel mesh (8), and continue to pour high-performance early-strength concrete (13) to the height of the finished surface of the bridge deck. S8: Repair the removed portion of the guardrail edge at the expansion joint; S9: Cover and cure the concrete construction area with a cloth or steam. Once the concrete strength reaches the design strength, open the road to traffic.

8. The construction process of the prefabricated bridge expansion joint anchorage structure as described in claim 7, characterized in that: It also includes the following steps: S7a: Pass the transverse steel bar (7) through several steel bar holes (23) in sequence and weld the transverse steel bar (7) to the connector (4) for fixation.

9. The construction process of the prefabricated bridge expansion joint anchorage structure as described in claim 8, applied to the anchorage structure as described in claim 3, is characterized in that: It also includes the following steps: S2a: Fix the waterstop (6) on both sides to the side walls of the first beam (1) and the second beam (2).

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