Arc-shaped expansion joint and construction method thereof

Abstract

The invention relates to an arc-shaped expansion joint and a construction method thereof. The arc-shaped expansion joint comprises a first connecting plate and a second connecting plate, and matched and continuous arc curved surfaces are arranged on the opposite faces of the first connecting plate and the second connecting plate; mounting grooves are further formed in the top surfaces of the first connecting plate and the second connecting plate, a metal cover plate is arranged on the mounting grooves, auxiliary connecting pieces are arranged on the two sides of the metal cover plate respectively and are in sealed connection with the end surfaces of the first connecting plate and the second connecting plate, and a filling piece is further arranged at the bottom of the metal cover plate; the method is carried out based on the mode of combining rigid materials and flexible materials, the metal cover plates and the auxiliary connecting pieces can form a triple waterproof structure, and corrosion of steel bars and deterioration of concrete are avoided; the arc-shaped structure and the wavy elastic structure on the surface can be effectively matched, so that the structure can adapt to horizontal expansion, vertical settlement and corner deformation of the bridge at the same time, and stable operation of the bridge under complex working conditions is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of bridge engineering technology, specifically to an arc-shaped expansion joint and its construction method. Background Technology

[0002] In bridge engineering, expansion joints, as key structural components, play a crucial role in adapting to deformations caused by temperature changes, vehicle loads, and foundation settlement. Their performance directly impacts the safety and service life of the bridge. Currently, traditional bridge expansion joints mostly adopt straight or simple zigzag designs, which have revealed numerous problems in practical applications. On the one hand, straight expansion joints are difficult to adapt to the curved contours of special bridge types such as curved bridges and skew bridges, leading to stress concentration at the joint and easily causing defects such as concrete damage and tearing of the waterstop. On the other hand, conventional expansion joint waterproofing structures often rely on a single rubber waterstop or sealant, which is prone to aging and cracking under environmental conditions such as rainwater erosion and freeze-thaw cycles.

[0003] In addition, the metal covers and connecting parts of existing expansion joints are mostly rigidly connected and lack a buffer structure. When vehicles pass by, they generate a large impact load, which not only causes noise pollution, but also exacerbates the fatigue damage of the expansion joints.

[0004] In conclusion, developing a new type of expansion joint structure that can adapt to the curved structure of bridges, has efficient waterproof performance, and balances deformation coordination and durability has become an urgent need to solve the current technical problems in bridge engineering. Summary of the Invention

[0005] Based on the above description, the present invention provides an arc-shaped expansion joint and its construction method to solve the shortcomings of existing expansion joints in terms of deformation adaptability and buffer structure, which cannot effectively take into account waterproofing, deformation and durability at the same time.

[0006] This invention is achieved through the following technical solutions: An arc-shaped expansion joint includes a first connecting plate and a second connecting plate. The opposing surfaces of the first and second connecting plates are provided with matching and continuous arc surfaces, which are coaxially adapted to the arc contours of adjacent structures. The top surfaces of the first and second connecting plates are also provided with mounting grooves, and metal cover plates are provided on the mounting grooves. Auxiliary connectors are provided on both sides of the metal cover plates and are sealed to the end faces of the first and second connecting plates. A filler is provided at the bottom of the metal cover plates, and the filler fills the gap between the first and second connecting plates.

[0007] Based on the above technical solution, the present invention can be further improved as follows.

[0008] Furthermore, the mounting groove is configured as a continuously curved arc groove and a stepped surface is formed on the surface of the first connecting plate or the second connecting plate. The auxiliary connector is also configured as a continuously curved part, and the cross-section of the auxiliary connector is L-shaped. The vertical section of the auxiliary connector is in close contact with the side wall of the mounting groove, while the horizontal section of the auxiliary connector is in contact with the top surface of the mounting groove.

[0009] Furthermore, the vertical section of the auxiliary connector is also provided with an injection groove. Multiple injection grooves are provided and arranged at intervals. The top surface of the vertical section of the auxiliary connector is provided with an injection hole that extends vertically downward and communicates with all the injection grooves.

[0010] Furthermore, the metal cover plate is configured as a continuously curved shape and fits the top surface of the horizontal section of the auxiliary connector, and the bottom surface of the metal cover plate and the top surface of the horizontal section of the auxiliary connector are also provided with matching groove structures and interlock with each other.

[0011] Furthermore, the surface of the metal cover plate is also provided with bolt holes, which extend vertically downwards into the interior of the auxiliary connector. Both ends of the metal cover plate are fixed to the top surface of the auxiliary connector through the bolt holes, and the top surface is arranged flush with the top surfaces of the first connecting plate and the second connecting plate.

[0012] Furthermore, the top surface of the metal cover is provided with a drainage groove, which slopes from the center of the metal cover to both sides, and the surface of the metal cover is coated with an anti-corrosion coating.

[0013] Furthermore, the top and bottom surfaces of the vertical section of the auxiliary connector are provided with a wave-shaped elastic structure, and a waterstop is also bonded to the edge of the top surface of the vertical section of the auxiliary connector.

[0014] Furthermore, the horizontal section surface of the auxiliary connector is provided with a number of fine holes, which are arranged in a rectangular array.

[0015] A construction method for an arc-shaped expansion joint includes the following steps: ①Preliminary positioning and pretreatment: Place the first connecting plate and the second connecting plate on both sides of the bridge gap according to the baseline, so that the opposite arc surfaces of the two are fully adapted and the end face gap is within the range of 5-10mm. At the same time, use expansion bolts to penetrate the reserved holes on the first connecting plate or the second connecting plate and fix them to the bridge structure. After tightening, use a level to check the flatness of the top surface of the connecting plate and clean the debris in the mounting groove on the top surface of the connecting plate. ② Sealing operation: Select silicone sealant or rubber strips as fillers, cut them according to the gap size and embed them into the arc gap between the first connecting plate and the second connecting plate to ensure full filling without gaps; ③ Auxiliary connector assembly: Fit the L-shaped auxiliary connector into the mounting groove along the arc direction, with the vertical section tightly against the side wall of the groove and the horizontal section against the bottom step surface of the groove, ensuring that the curvature is consistent with the connecting plate; at the same time, check the connection between the glue injection hole and the glue injection groove of the auxiliary connector. If there is a blockage, use a thin wire to clear it. Then, attach a waterstop strip to the top edge of the vertical section and press it firmly to ensure that there is no warping. ④ Injection and sealing: Inject epoxy resin or polyurethane adhesive into the injection hole until the adhesive overflows from the injection groove. After stopping the injection, seal the injection hole with a plug and let it stand to cure. After curing, check the integrity of the adhesive layer. If there is any missing adhesive, it needs to be added. ⑤ Cover plate positioning and fastening: Place the metal cover plate on the top surface of the horizontal section of the auxiliary connector in an arc direction, so that the groove structure on the bottom surface of the metal cover plate is precisely engaged with the groove on the top surface of the connector, and the two ends are aligned with the edges of the connecting plate; adjust the position of the metal cover plate to ensure that the top surface is flush with the top surfaces of the first connecting plate and the second connecting plate, and the drainage groove is inclined from the center to both sides; drive bolts through the bolt holes of the metal cover plate, penetrate the horizontal section of the auxiliary connector and tighten them, and then check the fit between the cover plate and the connector. If there are gaps, fill and seal them with sealant. ⑥ Performance testing: Waterproof test: Spray water onto the surface of the metal cover plate and observe whether there is leakage below the expansion joint. If there is no leakage for 30 minutes, it is considered qualified; Deformation adaptability test: Simulate the horizontal expansion and vertical settlement of the bridge and check that the components are not loose or torn; Appearance acceptance: The cover plate is flat and not warped, the gaps are uniform, the anti-corrosion coating is intact, and the drainage channel is correctly oriented.

[0016] Furthermore, the sidewall of the mounting groove in step ① is roughened by sanding and coated with an interface agent.

[0017] Compared with the prior art, the technical solution of this application has the following beneficial technical effects: This application improves upon existing curved expansion joints by combining rigid and flexible materials. A triple-waterproof structure is formed using a metal cover plate and auxiliary connectors. This "triple-insurance" waterproof system effectively prevents rainwater erosion and avoids steel corrosion and concrete deterioration. Furthermore, the flexible material is placed on both sides of the rigid material, with auxiliary connectors positioned at both ends of the metal cover plate. This effectively complements the curved structure and the wave-like elastic structure of its surface, allowing the structure to simultaneously adapt to the bridge's horizontal expansion and contraction, vertical settlement, and angular deformation, ensuring stable bridge operation under complex conditions. Attached Figure Description

[0018] Figure 1 This is an exploded structural diagram of the expansion joint in this embodiment; Figure 2 This is a schematic diagram of the auxiliary connector in this embodiment; Figure 3This is a schematic diagram of the structure of the first connecting plate, the second connecting plate, and the filler in this embodiment; Figure 4 This is a schematic diagram of the metal cover plate in this embodiment; The components are: 1. First connecting plate; 2. Second connecting plate; 3. Mounting groove; 4. Auxiliary connector; 41. Glue injection groove; 42. Glue injection hole; 5. Metal cover plate; 51. Bolt hole; 52. Drainage groove. Detailed Implementation

[0019] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0021] Combination Figure 1-4 As shown, an arc-shaped expansion joint includes: The first connecting plate 1 and the second connecting plate 2 have matching and continuous arc surfaces on their end faces, and the arc surfaces are coaxially adapted to the arc contour of the adjacent structure to ensure that the expansion joint transmits the load evenly along the arc direction. Metal cover plate 5 is set between the first connecting plate 1 and the second connecting plate 2 to support the expansion joint and to evenly transfer the load to the structures on both sides through the surface of the steel plate, thereby reducing the damage caused by direct stress on the concrete. Auxiliary connector 4 is made of rubber sheet or silicone sheet or other elastic material. It is set on both sides of metal cover plate 5 to act as a buffer component. Through the synergistic effect of rigid and flexible materials, the overall performance of expansion joint is improved, and the mechanical, deformation and durability problems that cannot be solved by a single material are solved. A filler is provided inside the gap between the first connecting plate 1 and the second connecting plate 2 to fill the gap. It can be silicone sealant or elastic materials such as rubber strips.

[0022] Specifically, in this embodiment, the metal cover plate 5 and the auxiliary connector 4 are both set as arc-shaped surfaces with the same end face as the first connecting plate 1 or the second connecting plate 2. At the same time, the top of the arc-shaped surface of the first connecting plate 1 and the second connecting plate 2 is provided with a mounting groove 3. The mounting groove 3 is arranged in a stepped manner, and the auxiliary connector 4 fits into the inside of the mounting groove 3 so that it fits tightly against the side wall of the mounting groove 3.

[0023] The cross-section of the auxiliary connector 4 is set to an L-shape, for example... Figure 2 As shown, its vertical section is tightly fitted to the side wall of the mounting groove 3, while the horizontal section is fitted to the bottom surface of the mounting groove 3, thereby forming an installation base through the auxiliary connecting parts 4 arranged opposite to each other on both sides. The metal cover plate 5 is horizontally arranged between the gap of the first connecting plate 1 and the second connecting plate 2 using this installation base, and the surface of the metal cover plate 5 is flush with the top surface of the first connecting plate 1 and the second connecting plate 2.

[0024] In the above structure, the bottom surface of the metal cover plate 5 and the horizontal section surface of the auxiliary connector 4 should be provided with matching toothed structures. The two are combined by interlocking to form a seal. A bolt hole 51 is also reserved on the top surface of the cover plate. The bolt hole 51 extends downward into the interior of the auxiliary connector 4 to lock and fix it. The bolt connection can also be glued. This design effectively enhances the overall rigidity of the expansion joint, making it less prone to component loosening or displacement when subjected to repeated vehicle rolling and impact loads, thus ensuring the long-term stable operation of the expansion joint.

[0025] An adhesive injection groove 41 is provided on the vertical side wall of the auxiliary connector 4. Multiple grooves 41 are provided, and an adhesive injection hole 42 is provided on the top surface of the vertical section of the auxiliary connector 4. The injection hole 42 extends vertically downwards and connects to all the grooves 41. Therefore, workers can inject adhesive (one of epoxy resin, polyurethane, or neoprene rubber) into the groove to ensure a tight seal between the vertical section of the auxiliary connector 4 and the side wall of the first connecting plate 1 or the second connecting plate 2. This tight fit between the auxiliary connector 4 and the mounting groove 3 reduces the impact of the external environment on the internal components. Furthermore, the adhesive injection groove 41 facilitates the replenishment and replacement of sealant later, eliminating the need for large-scale dismantling of the expansion joint structure, significantly reducing maintenance costs and construction difficulty, and improving maintenance efficiency.

[0026] Furthermore, waterstops are used to bond the gaps on both sides of the top surface of the vertical section of the auxiliary connector 4, that is, to cover the connection between the auxiliary connector 4 and the first connecting plate 1 or the second connecting plate 2, and to cover the gap between the auxiliary connector 4 and the side wall of the metal cover plate 5.

[0027] In this embodiment, combining the three effective sealing structures described above, in addition to the waterproof barrier formed by the metal cover plate 5 and the auxiliary connector 4, a first line of defense is formed by the waterstop bonded to the vertical edge of the auxiliary connector 4. The injection groove 41 on the auxiliary connector 4, in conjunction with the injection hole 42, allows for the injection of sealant to form a second sealing layer. Furthermore, the toothed interlocking structure between the metal plate and the auxiliary connector 4 forms a third sealing layer. This "triple-insurance" waterproofing system, according to actual engineering tests, can reduce the leakage rate to below 5%, effectively preventing rainwater erosion and avoiding steel reinforcement corrosion and concrete deterioration.

[0028] Furthermore, the vertical section of the auxiliary connector 4 features a wave-shaped elastic structure on both its top and bottom surfaces. This structure works in conjunction with the filler material between the first connecting plate 1 and the second connecting plate 2 to simultaneously accommodate the bridge's horizontal expansion and contraction, vertical settlement, and angular deformation. Testing has shown that this expansion joint maintains good working condition within a range of ±80mm horizontal displacement, ±30mm vertical settlement, and ±3° angular deviation, effectively preventing damage to the expansion joint due to inconsistent deformation and ensuring the stable operation of the bridge under complex conditions.

[0029] The horizontal section of the auxiliary connector 4 is also provided with fine holes. Multiple fine holes are arranged in a rectangular array. Through the fine hole structure and its elastic material, the auxiliary connector 4 can reduce the noise and vibration generated when the vehicle passes by by utilizing the porous structure and vibration dissipation principle, thereby improving driving comfort and reducing the fatigue damage of vibration to the expansion joint and bridge structure.

[0030] The surface of the metal plate is also provided with drainage grooves 52. The bottom of the drainage grooves 52 is arranged sloping from the center to both ends, so that rainwater can be quickly drained and the residue of corrosive media can be reduced. At the same time, the surface of the metal plate should also be sprayed with an anti-corrosion coating to avoid corrosion by rainwater.

[0031] The construction steps for curved expansion joints are as follows: ①Preliminary positioning and pretreatment: Place the first connecting plate 1 and the second connecting plate 2 on both sides of the bridge gap according to the baseline, so that the opposite arc surfaces of the two are fully adapted and the end face gap is within the range of 5-10mm. At the same time, use expansion bolts to penetrate the reserved holes on the first connecting plate 1 or the second connecting plate 2 and fix them to the bridge structure. After tightening, use a level to check the flatness of the top surface of the connecting plate and clean the debris in the mounting groove 3 on the top surface of the connecting plate. ② Sealing operation: Select silicone sealant or rubber strips as fillers, cut them according to the gap size and embed them into the arc gap between the first connecting plate 1 and the second connecting plate 2 to ensure full filling without gaps; ③ Assembly of auxiliary connector 4: Fit the L-shaped auxiliary connector 4 into the mounting groove 3 along the arc direction, with the vertical section close to the side wall of the groove and the horizontal section close to the bottom step surface of the groove, ensuring that the curvature is consistent with the connecting plate; at the same time, check the communication between the glue injection hole 42 and the glue injection groove 41 of the auxiliary connector 4. If there is a blockage, use a thin iron wire to clear it. Then, attach a waterstop strip to the top edge of the vertical section and press it firmly to ensure that there is no curling edge. ④ Injection and sealing: Inject epoxy resin or polyurethane adhesive into injection hole 42 until the adhesive overflows from injection groove 41. After stopping the injection, plug injection hole 42 and let it stand to cure. After curing, check the integrity of the adhesive layer. If there is insufficient adhesive, it needs to be added. ⑤ Cover plate positioning and fastening: Place the metal cover plate 5 on the top surface of the horizontal section of the auxiliary connector 4 in an arc direction, so that the groove structure on the bottom surface of the metal cover plate 5 is precisely fastened to the groove on the top surface of the connector, and the two ends are aligned with the edges of the connecting plate; adjust the position of the metal cover plate 5 to ensure that the top surface is flush with the top surface of the first connecting plate 1 and the second connecting plate 2, and the drainage groove 52 is inclined from the center to both sides; drive the bolts through the bolt holes 51 of the metal cover plate 5, with a bolt spacing ≤200mm, and the bolts penetrate the horizontal section of the auxiliary connector 4 and tighten them (a metal sleeve needs to be added inside the connector 4, and threads need to be added inside the sleeve. The bolts are riveted to the metal sleeve through the thread structure. If it is necessary to further improve the rigidity, an additional metal frame can be added inside the connector). When tightening, use a torque wrench to apply force evenly, and then check the fit between the cover plate and the connector. If there are gaps, fill and seal them with sealant.

[0032] In addition, all the metal cover plates and bolts and other metal parts mentioned above should be coated with an anti-corrosion coating or have an anti-corrosion layer plated directly on their surfaces in order to extend their service life.

[0033] After construction is completed, performance testing will be conducted on the above structure, including: ① Waterproof test: Spray water onto the surface of the metal cover plate 5 and observe whether there is leakage below the expansion joint. If there is no leakage for 30 minutes, it is considered qualified. ② Deformation adaptability test: Simulate horizontal expansion and contraction (±80mm) and vertical settlement (±30mm) of the bridge, and check that the components are not loose or torn; ③Appearance inspection: The cover plate is flat and without warping, the gaps are uniform, the anti-corrosion coating is intact, and the drainage channel 52 is correctly oriented.

[0034] Furthermore, in step ①, in order to effectively enhance the bonding strength, the side wall surface of the mounting groove 3 should be roughened using sandpaper or other polishing materials, and an interface agent should be applied to its surface. The purpose is to expand the contact area and mechanical interlocking. Since the mounting groove 3 is the core assembly carrier of the auxiliary connector 4, its original surface is mostly flat concrete or metal, and the contact area is limited when directly bonded. Roughening the surface can create uneven micro-textures on the groove wall, increasing the actual contact area with the auxiliary connector 4 and the sealant. At the same time, the rough surface can form a "mechanical interlocking" structure with the bonding surface of the auxiliary connector 4, similar to "serrated interlocking", which greatly improves the adhesion between the two and prevents the auxiliary connector 4 from shifting or warping when the vehicle vibrates or the structure deforms.

[0035] In addition, the auxiliary connector 44 is made of flexible materials such as rubber or silicone. Its adhesive performance depends on the roughness of the contact surface. The roughened surface after grinding allows the flexible material to be better embedded in the recess, forming a tight "anchoring effect" and solving the problem of "easy slippage" between the rigid groove wall and the flexible connector.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the technical solutions of the embodiments of the present invention.

Claims

1. An arc-shaped expansion joint, characterized in that, The system includes a first connecting plate (1) and a second connecting plate (2), and the opposite sides of the first connecting plate (1) and the second connecting plate (2) are provided with matching and continuous arc surfaces, which are coaxially adapted to the arc contours of adjacent structures; the top surfaces of the first connecting plate (1) and the second connecting plate (2) are also provided with mounting grooves (3), and the mounting grooves (3) are provided with metal cover plates (5). The two sides of the metal cover plates (5) are respectively provided with auxiliary connecting parts (4) and are sealed to the end faces of the first connecting plate (1) and the second connecting plate (2). The bottom of the metal cover plates (5) is also provided with fillers, and the fillers fill the gap between the first connecting plate (1) and the second connecting plate (2).

2. The arc-shaped expansion joint according to claim 1, characterized in that, The mounting groove (3) is configured as a continuously curved arc groove and a stepped surface is formed on the surface of the first connecting plate (1) or the second connecting plate (2). The auxiliary connector (4) is also configured as a continuously curved part, and the cross-section of the auxiliary connector (4) is L-shaped. The vertical section of the auxiliary connector (4) is closely fitted with the side wall of the mounting groove (3), and the horizontal section of the auxiliary connector (4) is fitted with the top surface of the mounting groove (3).

3. The arc-shaped expansion joint according to claim 2, characterized in that, The vertical section of the auxiliary connector (4) is also provided with an injection groove (41). Multiple injection grooves (41) are provided and arranged at intervals. The top surface of the vertical section of the auxiliary connector (4) is provided with an injection hole (42) and extends vertically downward to communicate with all the injection grooves (41).

4. The arc-shaped expansion joint according to claim 3, characterized in that, The metal cover plate (5) is configured to be continuously curved and fits the top surface of the horizontal section of the auxiliary connector (4). The bottom surface of the metal cover plate (5) and the top surface of the horizontal section of the auxiliary connector (4) are also provided with matching groove structures and are interlocked with each other.

5. The arc-shaped expansion joint according to claim 4, characterized in that, The surface of the metal cover plate (5) is also provided with bolt holes (51). The bolt holes (51) extend vertically downward into the interior of the auxiliary connector (4). Both ends of the metal cover plate (5) are fixed to the top surface of the auxiliary connector (4) through the bolt holes (51) and the top surface is arranged flush with the top surfaces of the first connecting plate (1) and the second connecting plate (2).

6. The arc-shaped expansion joint according to claim 5, characterized in that, The top surface of the metal cover plate (5) is also provided with a drainage groove (52), which is inclined from the center of the metal cover plate (5) to both sides, and the surface of the metal cover plate (5) is sprayed with an anti-corrosion coating.

7. The arc-shaped expansion joint according to claim 6, characterized in that, The vertical section of the auxiliary connector (4) has a wave-shaped elastic structure on its top and bottom surfaces, and a waterstop is also attached to the edge of the top surface of the vertical section of the auxiliary connector (4).

8. The arc-shaped expansion joint according to claim 7, characterized in that, The horizontal section surface of the auxiliary connector (4) is also provided with several fine holes, which are arranged in a rectangular array.

9. A construction method for an arc-shaped expansion joint, used for constructing the arc-shaped expansion joint according to any one of claims 1-8, characterized in that, Includes the following steps: ①Preliminary positioning and pretreatment: Place the first connecting plate (1) and the second connecting plate (2) on both sides of the bridge gap according to the baseline, so that the relative arc surfaces of the two are fully matched and the end face gap is within the range of 5-10mm. At the same time, use expansion bolts to penetrate the reserved holes on the first connecting plate (1) or the second connecting plate (2) and fix them to the bridge structure. After tightening, use a level to check the flatness of the top surface of the connecting plate and clean the debris in the mounting groove (3) on the top surface of the connecting plate. ② Sealing operation: Select silicone sealant or rubber strip as filler, cut according to the gap size and embed into the arc gap between the first connecting plate (1) and the second connecting plate (2) to ensure full filling without gaps; ③Auxiliary connector assembly: Place the L-shaped auxiliary connector (4) into the mounting groove (3) along the arc direction. The vertical section should be close to the side wall of the groove, and the horizontal section should be close to the bottom step surface of the groove to ensure that the curvature is consistent with the connecting plate. At the same time, check the communication between the glue injection hole (42) and the glue injection groove (41) of the auxiliary connector (4). If there is a blockage, use a thin iron wire to clear it. Then, attach a waterstop strip to the top edge of the vertical section and press it to ensure that there is no curling. ④ Injection and sealing: Inject epoxy resin or polyurethane glue into the injection hole (42) until the glue overflows from the injection tank (41). After stopping the injection, plug the injection hole with a stopper and let it stand to cure. After curing, check the integrity of the glue layer. If there is any missing glue, it needs to be added. ⑤ Cover plate positioning and fastening: Place the metal cover plate (5) on the top surface of the horizontal section of the auxiliary connector (4) in the arc direction, so that the groove structure on the bottom surface of the metal cover plate (5) is precisely fastened to the groove on the top surface of the connector, and the two ends are aligned with the edge of the connecting plate; adjust the position of the metal cover plate (5) to ensure that the top surface is flush with the top surface of the first connecting plate (1) and the second connecting plate (2), and the drainage groove (52) is inclined from the center to both sides; drive the bolts through the bolt holes (51) of the metal cover plate (5), penetrate the horizontal section of the auxiliary connector (4) and tighten them, and then check the fit between the cover plate and the connector. If there are gaps, fill and seal them with sealant. ⑥ Performance testing: Waterproof test: Spray water onto the surface of the metal cover plate (5) and observe whether there is leakage below the expansion joint. If there is no leakage for 30 minutes, it is considered qualified; Deformation adaptability test: Simulate the horizontal expansion and vertical settlement of the bridge and check that the components are not loose or torn; Appearance acceptance: The cover plate is flat and not warped, the gaps are uniform, the anti-corrosion coating is intact, and the drainage channel is correctly oriented.

10. The construction method for arc-shaped expansion joints according to claim 9, characterized in that, The side wall of the mounting groove (3) in step ① is roughened by sanding with sandpaper and coated with an interface agent.

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