A rigid-flexible elastic repositioning seamless expansion joint structure

Abstract

This utility model discloses a rigid-flexible elastically restoring seamless expansion joint structure, comprising an elastic expansion structure, a rigid support structure, and a polyurethane elastic concrete filling layer. A rectangular cross-section spring has sliding contacts at both ends via sliders and rods. The rigid support structure uses arched corrugated steel plates to transfer vertical loads to the beam, combined with horizontal corrugated steel plates to disperse upper pressure, forming a rigid-flexible composite load-bearing system. The polyurethane elastic concrete filling layer completely fills the gaps between components with flowing polyurethane elastic concrete to form a seamless elastomer. A prefabricated elastic cover plate and sealant are used to create a continuous driving surface on top. This utility model integrates high-strength rigid support with high-performance flexible deformation adaptability. While efficiently adapting to complex multi-directional displacements, it aims to eliminate driving bumps, isolate noise, establish a long-term sealing system, and endow it with excellent self-elastic restoring capability to maintain long-term performance stability.

Description

Technical Field

[0001] This utility model relates to bridge expansion joint technology, and more particularly to a rigid-flexible elastic repositioning seamless expansion joint structure. Background Technology

[0002] In this new phase of profound transformation in the engineering construction field, guided by the concept of sustainable development, promoting the greening, long-term sustainability, and intelligentization of infrastructure has become an inevitable requirement for reshaping industry standards. This trend profoundly impacts the design and operation and maintenance of large bridges, highways, airport runways, and ultra-long building structures. As a key component in addressing expansion and contraction displacements caused by temperature deformation, material shrinkage and creep, foundation settlement, and dynamic loads, the performance of expansion joints directly determines the overall durability, safety, reliability, and life-cycle benefits of a project. Seamless expansion joints, through high-performance materials and structural design, aim to provide superior displacement adaptability, sealing durability, and driving smoothness. However, traditional seamless expansion joint technology has long faced severe challenges:

[0003] 1) Insufficient interfacial bonding reliability: The interfacial bonding performance between the filler material and the asphalt pavement layer is the key to its long-term service. However, traditional materials are prone to debonding, peeling or edge cracking due to poor compatibility, temperature stress, construction process limitations or aging, forming new water seepage channels and accelerating the destruction of the overall structure.

[0004] 2) Weak and easily deformable support system: Its structure often lacks an efficient and rigid internal support system and mainly relies on the strength of the filling material itself to resist the load. Under heavy load or high-frequency traffic impact, it is prone to local crushing, denting or overall subsidence deformation, which will damage the continuity of the bridge deck and the smoothness of driving.

[0005] 3) Poor adaptability to complex displacements: These types of structures are usually difficult to effectively coordinate and adapt to the multi-directional deformation and large displacement deformation caused by the combined effects of temperature, load, shrinkage, creep and settlement. They are prone to stress concentration at the interface or inside the material, which can lead to debonding, cracking or overall failure, making it difficult to meet the long-term displacement requirements of large or complex structures. Summary of the Invention

[0006] In view of the aforementioned deficiencies in the prior art, the technical problem to be solved by this utility model is the lack of reliable interface bonding, weak and easily deformable support system, and poor adaptability to complex displacements in existing seamless expansion joint technologies. This utility model provides a rigid-flexible elastically restoring seamless expansion joint structure that integrates high-strength rigid support with high-performance flexible deformation adaptability. While efficiently adapting to complex multi-directional displacements, it aims to eliminate driving bumps, isolate noise, establish a long-lasting sealing system, and endow it with excellent self-elastic restoring capability to maintain long-term performance stability.

[0007] To achieve the above objectives, this utility model provides a rigid-flexible elastic resetting seamless expansion joint structure, including an elastic expansion structure, a rigid support structure, and a polyurethane elastic concrete filling layer.

[0008] The elastic telescopic structure includes a displacement control rod (3), a rectangular section spring (6), a slider (5), a rubber sleeve (7), an angle steel (4), and a first vertical anchor rod (11). The rectangular section spring (6) is fitted onto the displacement control rod (3), the slider (5) is fixed to both ends of the rectangular section spring (6), the angle steel (4) is fixed to the outside of the two sliders (5), the rubber sleeve (7) is fitted onto both ends of the displacement control rod (3), and the first vertical anchor rod (11) is used to anchor the angle steel (4) to the beam (1).

[0009] The rigid support structure includes an arched corrugated steel plate (10), a second vertical anchor rod (17) and a flat corrugated steel plate (16). The second vertical anchor rod (17) anchors the arched corrugated steel plate (10) to the beam (1), and the flat corrugated steel plate (16) is supported on the angle steel (4) at both ends.

[0010] The polyurethane elastic concrete filling layer fills the gaps between the elastic expansion structure and the rigid support structure with polyurethane elastic concrete (9), and the upper surface of the layer is bonded with a precast elastic cover plate (15) by a first sealant (13); the rigid-flexible elastic reset seamless expansion joint structure also includes a cross joint steel plate (8) arranged across the expansion joint gap along the driving direction, and the bottom surface of the cross joint steel plate (8) covers the expansion joint opening; the rigid-flexible elastic reset seamless expansion joint structure also includes a backing plate (12) vertically sandwiched between the beam (1) and the asphalt layer (2) and the polyurethane elastic concrete filling layer, and a second sealant (14) filled above the backing plate (12) for bonding the asphalt layer (2) and the precast elastic cover plate (15).

[0011] Furthermore, the displacement control rod (3) is a rigid rod whose main body is arranged along the driving direction.

[0012] Furthermore, the rectangular section spring (6) is a helical compression spring made of a rectangular section metal spring strip, with its central through hole passing through and fitted onto the displacement control rod (3).

[0013] Furthermore, the sliders (5) are fixedly connected to the two end faces of the rectangular cross-section spring (6), and the inner hole of each slider (5) forms a sliding fit with the displacement control rod (3).

[0014] Furthermore, the angle steel (4) is an L-shaped steel component arranged along the transverse bridge direction and fixed to the outside of the slider (5); the horizontal limb plate of the angle steel (4) is provided with a hole for the first vertical anchor rod (11) to pass through; the vertical limb plate of the angle steel (4) is provided with a hole for the displacement control rod (3) to pass through; the angle steel (4) is provided with a spacer rib.

[0015] Furthermore, the rubber sleeve (7) is a cylindrical part made of elastic rubber, which is fitted onto both ends of the displacement control rod (3); one end abuts against the outer side of the angle steel (4), and the other end abuts against the end face of the displacement control rod (3), with the inner wall of the hole fitting the rod body.

[0016] Furthermore, the first vertical anchor rod (11) is a vertically installed metal rod with its rod body inserted through the hole in the horizontal limb plate of the angle steel (4) and extending downward into the concrete of the beam body (1). The upper end of the rod body is locked by a fastening device.

[0017] Furthermore, the arched corrugated steel plate (10) is a metal plate arranged along the driving direction. Its cross section is continuously corrugated and the whole is bent to form an arched structure. The top of the steel plate is located directly above the elastic expansion structure, and the arch foot areas at both ends are fixedly connected to the beams (1) on both sides through the second vertical anchor rod (17).

[0018] Furthermore, the second vertical anchor rod (17) is a vertically installed metal rod with its rod body passing through a hole at the end of the arched corrugated steel plate (10) and extending downward into the concrete of the beam body (1). The upper end of the rod body is locked by a fastening device.

[0019] Furthermore, the planar corrugated steel plate (16) is a planar corrugated metal plate with a continuous corrugated cross section, which is horizontally mounted directly above the elastic telescopic structure, and its two ends are directly supported on the upper surface of the angle steel (4) on both sides of the elastic telescopic structure.

[0020] Furthermore, polyurethane elastic concrete (9) is a composite material made of polyurethane and aggregate. After curing, it forms a seamless continuous solid filler that completely fills and closely adheres to the gaps of all internal components of the elastic expansion structure and rigid support structure.

[0021] Furthermore, the length of the cross-joint steel plate (8) is symmetrically distributed on both sides of the center line of the expansion joint, and its bottom surface is ground flat to form a plane.

[0022] Furthermore, the backing board (12) is made of closed-cell polyethylene foam or rubber foam material.

[0023] Furthermore, the precast elastic cover plate (15) is precast from polyurethane elastic concrete and is set on top of polyurethane elastic concrete (9). The bottom surface is bonded to polyurethane elastic concrete (9) by the first sealant (13), the top surface is flush with the asphalt layer (2), and the two sides are seamlessly bonded to the asphalt layer (2) by the second sealant (14).

[0024] Furthermore, the first sealant (13) and the second sealant (14) are polyurethane modified elastic materials; wherein, the bottom surface of the first sealant (13) is seamlessly attached to the upper surface of the polyurethane elastic concrete (9), and the top surface is seamlessly attached to the lower surface of the precast elastic cover plate (15); the bottom surface of the second sealant (14) is seamlessly attached to the upper surface of the backing plate (12), the top surface is flush with the top surface of the asphalt layer (2), and the two sides are respectively bonded to the asphalt layer (2) and the precast elastic cover plate (15); the two sides of the first sealant (13) are connected to the second sealant (14).

[0025] Technical effect

[0026] (1) The seamless expansion joint of this utility model adopts an elastic expansion structure. The displacement control rod, as a rigid guide rail, runs through the entire elastic expansion structure. A rectangular cross-section spring is tightly fitted on it, and the two ends of the spring are connected to the rod through sliders to form a sliding fit. When the bridge undergoes expansion and contraction deformation due to temperature rise and fall or concrete shrinkage and creep, the movement of the beams on both sides will push the angle steel, thereby driving the slider to slide along the axial direction of the displacement control rod, thus compressing or stretching the rectangular cross-section spring. Due to its rectangular cross-section spring strip and helical structure characteristics, the spring can generate significant and stable elastic restoring force while providing a large stroke displacement space. After the external force disappears, the elastic potential energy stored in the spring will be continuously and stably released, driving the slider back to the equilibrium position, realizing the automatic reset of the structure, and effectively avoiding the problems of jamming, vehicle jumping or sealing failure caused by residual deformation of traditional expansion joints. The rubber sleeves at both ends provide elastic buffer and sealing for the displacement control rod, compensating for small displacements and protecting the rod ends. The entire elastic expansion structure ensures that the expansion and contraction movement is always linear, controllable and reversible.

[0027] (2) The seamless expansion joint of this utility model adopts a rigid support structure. The two ends of the arched corrugated steel plate are anchored to the beams on both sides by vertical anchor rods. Its arched structure can efficiently transfer the vertical load from above to the beams, forming a solid span support. The flat corrugated steel plate is horizontally erected on the upper surface of the angle steel on both sides, directly bearing and distributing the load from the polyurethane elastic concrete filling layer and the driving layer above it, and evenly transferring it to the angle steel and the beams on both sides. This design allows the elastic expansion structure to focus on free expansion and contraction and reset, while the rigid structure undertakes the main load transfer task. The two work together to provide a load-bearing capacity and structural stability far exceeding that of traditional pure elastic expansion joints.

[0028] (3) The seamless expansion joint of this utility model is filled with polyurethane elastic concrete. Polyurethane elastic concrete itself has excellent weather resistance, anti-aging properties, chemical corrosion resistance and wear resistance. The fluid polyurethane elastic concrete can completely penetrate and fill all the tiny gaps and cavities in the elastic expansion structure and rigid support structure during pouring. After curing, it forms a continuous solid elastic filler that is tightly bonded to the surface of all components without joints, eliminating gaps and channels for water seepage or the infiltration of debris, and providing excellent waterproof sealing and durable barrier. The backing plate, as a flexible isolation layer, effectively separates the rigid beam and asphalt layer from the polyurethane elastic concrete, allowing it to deform freely without restraint and avoiding stress concentration. The precast elastic cover plate on top forms a strong and elastic sealing layer through two layers of sealant, and its top surface is strictly flush with the top surface of the asphalt layer on both sides. When vehicles pass through, they will not feel any bumps or "jumps," and the noise and vibration will be significantly reduced due to the cushioning of the elastic material, providing a highly smooth, comfortable and quiet driving environment.

[0029] The following will further explain the concept, specific structure and technical effects of this utility model in conjunction with the accompanying drawings, so as to fully understand the purpose, features and effects of this utility model. Attached Figure Description

[0030] Figure 1 This is a longitudinal cross-sectional structural diagram of a preferred embodiment of the seamless expansion joint employing an elastic expansion structure;

[0031] Figure 2 This is a top view schematic diagram of a preferred embodiment of the present invention, showing a seamless expansion joint employing an elastic expansion structure.

[0032] Figure 3 This is a side view of a preferred embodiment of the present invention, showing a seamless expansion joint with an elastic expansion structure.

[0033] Figure 4 This is a three-dimensional partial structural diagram of a preferred embodiment of the seamless expansion joint employing an elastic expansion structure.

[0034] Among them, 1-beam body, 2-asphalt layer, 3-displacement control rod, 4-angle steel, 5-slider, 6-rectangular section spring, 7-rubber sleeve, 8-span steel plate, 9-polyurethane elastic concrete, 10-arched corrugated steel plate, 11-first vertical anchor rod, 12-backing plate, 13-first sealant, 14-second sealant, 15-prefabricated elastic cover plate, 16-flat corrugated steel plate, 17-second vertical anchor rod. Detailed Implementation

[0035] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0036] In the following description, specific details, such as particular internal procedures and techniques, are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the present invention. However, those skilled in the art will understand that the present invention may be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of the present invention with unnecessary detail.

[0037] like Figure 1-4 As shown in the figure, the present invention provides a rigid-flexible elastic resetting seamless expansion joint structure, which includes an elastic expansion structure, a rigid support structure, and a polyurethane elastic concrete filling layer.

[0038] Specifically, the elastic telescopic structure includes a displacement control rod 3 arranged along the travel direction, running through the entire elastic telescopic structure. A rectangular cross-section spring 6 is fitted onto the displacement control rod 3 with its central through hole. The displacement control rod 3 provides a sliding track for the rectangular cross-section spring 6, constraining the rectangular cross-section spring 6 to slide linearly only along the axial direction of the rod, preventing lateral displacement or torsion.

[0039] The slider 5 is fixedly connected to both ends of the rectangular section spring 6. Its inner hole forms a sliding fit with the displacement control rod 3, so that the slider 5 and the rectangular section spring 6 connected to it can slide smoothly and with low friction along the axial direction of the displacement control rod 3 to realize the "expansion" action of the expansion joint.

[0040] Angle steel 4 is arranged along the transverse direction of the bridge and fixed to the outside of the slider 5. The horizontal limb plate of angle steel 4 is anchored to the beams 1 on both sides by vertical anchor rods 11, providing a foundation fixing point for the entire elastic expansion structure. The holes on the vertical limb plate of angle steel 4 allow displacement control rods 3 to pass through, allowing the displacement control rods 3 to slide along the rod direction. Angle steel 4 is provided with spacer ribs to enhance the overall rigidity and torsional resistance of angle steel 4, prevent local deformation or instability, and ensure the reliability and durability of the expansion joint reset function.

[0041] The first vertical anchor rod 11 is vertically inserted through the hole in the horizontal limb plate of the angle steel 4 and extends downward into the concrete of the beam 1. The upper end of the first vertical anchor rod 11 is locked by a fastening device, pressing and fixing the angle steel 4 to the top surface of the beam 1.

[0042] A rectangular cross-section spring 6, as the core component, is mounted on the displacement control rod 3. Its two ends are connected to the rod via sliders 5, which are fixed to the angle steel 4. The angle steel 4 is pressed and fixed to the top surface of the beam 1 by the first vertical anchor rod 11. When the two sides of the beam 1 experience relative displacement due to temperature or load, the angle steel 4 pushes the sliders 5 to slide axially along the displacement control rod 3, causing the rectangular cross-section spring 6 to compress or stretch. The rectangular cross-section spring 6 expands and contracts through a spring-and-socket spiral structure, achieving energy buffering and dissipation. When the external force causing the displacement disappears or weakens, the rectangular cross-section spring 6 generates a strong restoring force, driving the sliders 5 and angle steel 4 to automatically reset. This process effectively controls the displacement of the beam 1, improving structural stability and durability.

[0043] The rubber sleeve 7 fits tightly against the end of the displacement control rod 3, sealing the gap between the rod end and the angle steel 4. When the slider 5 slides towards the end of the displacement control rod 3, the rubber sleeve 7 uses its elastic material to buffer the rigid impact of the slider 5 on the rod end or the angle steel 4, reducing stress concentration. At the same time, it can also prevent the displacement control rod 3 from rusting, ensuring smooth sliding and structural life.

[0044] The rigid support structure includes an arched corrugated steel plate 10 arranged along the driving direction. Its cross-section is continuously corrugated and bent into an arch shape, spanning the expansion joint gap. The arch apex is located directly above the elastic expansion structure, and the arch foot areas at both ends are fixedly connected to the beams 1 on both sides via second vertical anchor rods 17. The arched corrugated steel plate 10 has excellent bending, compressive, and load-bearing properties, effectively transferring the load to the arch foot area when vehicle loads are applied. The arched structure, combined with the corrugated cross-section design, provides a continuous rigid support platform for the expansion joint area, significantly improving the expansion joint area's resistance to deformation under vehicle loads and ensuring smooth driving.

[0045] The second vertical anchor rod 17 is vertically inserted through the pre-drilled hole at the end of the arched corrugated steel plate 10 and extends downwards into the concrete of the beam 1. The upper end of the rod is locked by a fastening device, pressing and fixing the arch foot area of ​​the arched corrugated steel plate 10 to the top surface of the beam 1.

[0046] The flat corrugated steel plate 16 is horizontally mounted on the two angle steels 4 directly above the elastic expansion structure. The flat corrugated steel plate 16 covers the elastic expansion structure, forming a rigid protective layer to prevent the filler material from directly squeezing the elastic expansion structure under vehicle load, while not affecting the expansion and contraction function of the elastic structure below.

[0047] The polyurethane elastic concrete infill layer comprises polyurethane elastic concrete 9, which, in its flowing slurry state, completely fills the gaps between the internal components of the elastic expansion and contraction structure and the rigid support structure, and adheres tightly to the surfaces of each component. Upon curing, it forms a seamless, continuous solid infill, bonding and encapsulating all internal components into a cohesive composite. This material possesses high strength and a high modulus of elasticity, effectively withstanding vehicle loads. Its excellent elastic deformation capacity accommodates the thermal expansion and contraction of the beam 1 and the displacement of internal components, preventing cracking.

[0048] The precast elastic cover plate 15 is precast from polyurethane elastic concrete and laid on top of the polyurethane elastic concrete 9. Its bottom surface is seamlessly bonded to the underlying filler through a first sealant 13, ensuring effective load transfer to the internal structure. Its top surface is at the same elevation as the adjacent asphalt layer 2, eliminating driving bumps. Both sides are tightly bonded to the asphalt layer 2 through a second sealant 14, forming a smooth and continuous driving interface. The precast elastic cover plate 15 has excellent wear resistance and elasticity, and can resist traffic wear and cushion vehicle impacts for a long time. When severe wear occurs or the service life is reached, it can be replaced individually, avoiding damage to the core structure and significantly reducing maintenance costs and traffic disruption time.

[0049] The backing plate 12 is vertically positioned between the beam 1, the asphalt layer 2, and the polyurethane elastic concrete 9, forming a physical barrier to prevent direct bonding between the two. The backing plate 12 is flexible and compressible, and can be compressed or deformed along with the beam 1 when it deforms due to temperature or load.

[0050] The first sealant 13 is located between the polyurethane elastic concrete 9 and the precast elastic cover plate 15. Its bottom surface is seamlessly bonded to the upper surface of the polyurethane elastic concrete 9, and its top surface is seamlessly bonded to the lower surface of the precast elastic cover plate 15, firmly bonding the two together as a whole. Its side is connected to the second sealant 14. The first sealant 13 is made of polyurethane modified elastic material, which can coordinate the slight differences in deformation between the two layers and prevent them from separating.

[0051] The second sealant 14 is filled above the backing plate 12, with its bottom surface seamlessly adhering to the upper surface of the backing plate 12. Its top surface is flush with the asphalt layer 2 to form a continuous driving surface. The asphalt layer 2 and the precast elastic cover plate 15 are respectively bonded to the two sides. The second sealant 14 seals the joint between the precast elastic cover plate 15 and the asphalt layer 2, preventing surface water from seeping into the ground and maintaining the integrity of the seal.

[0052] The steel plate 8 spanning the joint is arranged under the polyurethane elastic concrete 9 along the direction of travel, spanning the expansion joint gap. Its length is symmetrically distributed on both sides of the center line of the gap, and its bottom surface is ground smooth to ensure flatness and no warping. The steel plate 8 covering the joint can prevent rainwater from seeping in.

[0053] This utility model discloses a rigid-flexible elastic reset seamless expansion joint structure, belonging to the field of bridge expansion joint technology. Its elastic expansion structure features a rectangular cross-section spring with sliders at both ends forming a sliding fit with a rod. The rectangular cross-section spring provides continuous elastic restoring force, ensuring automatic reset after displacement. The displacement control rod ensures the linearity, smoothness, and controllability of the expansion and contraction movement. The rigid support structure uses arched corrugated steel plates to transfer vertical loads to the beam, combined with horizontal corrugated steel plates to disperse upper pressure, forming a rigid-flexible composite load-bearing system. A polyurethane elastic concrete filling layer completely fills the gaps between components, forming a seamless elastomer. A prefabricated elastic cover plate and sealant are used to create a continuous driving surface on top. This utility model significantly improves displacement adaptability, load-bearing capacity, and waterproof sealing, reducing driving bumps and noise, and providing a long-lasting, maintenance-free, reliable expansion joint solution for infrastructure.

[0054] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A rigid-flexible elastic repositioning seamless expansion joint structure, characterized in that, It includes elastic expansion structure, rigid support structure and polyurethane elastic concrete filling layer; The elastic telescopic structure includes a displacement control rod (3), a rectangular section spring (6), a slider (5), a rubber sleeve (7), an angle steel (4), and a first vertical anchor rod (11). The rectangular section spring (6) is fitted onto the displacement control rod (3), the slider (5) is fixed to both ends of the rectangular section spring (6), the angle steel (4) is fixed to the outside of the two sliders (5), and the rubber sleeve (7) is fitted onto both ends of the displacement control rod (3). The first vertical anchor rod (11) is used to anchor the angle steel (4) to the beam (1). The rigid support structure includes an arched corrugated steel plate (10), a second vertical anchor rod (17), and a flat corrugated steel plate (16). The second vertical anchor rod (17) anchors the arched corrugated steel plate (10) to the beam (1), and the flat corrugated steel plate (16) is supported on the angle steel (4) at both ends. The polyurethane elastic concrete filling layer fills the gaps between the elastic expansion structure and the rigid support structure with polyurethane elastic concrete (9), and a prefabricated elastic cover plate (15) is bonded to its upper surface by a first sealant (13); the rigid-flexible elastic reset seamless expansion joint structure also includes a cross joint steel plate (8) arranged across the expansion joint gap along the driving direction, and the bottom surface of the cross joint steel plate (8) covers the expansion joint opening; the rigid-flexible elastic reset seamless expansion joint structure also includes a backing plate (12) vertically sandwiched between the beam (1) and the asphalt layer (2) and the polyurethane elastic concrete filling layer, and a second sealant (14) filled above the backing plate (12) for bonding the asphalt layer (2) and the prefabricated elastic cover plate (15).

2. The rigid-flexible elastic resetting seamless expansion joint structure as described in claim 1, characterized in that, The displacement control rod (3) is a rigid rod whose main body is arranged along the driving direction.

3. The rigid-flexible elastic repositioning seamless expansion joint structure as described in claim 2, characterized in that, The rectangular cross-section spring (6) is a helical compression spring made of a rectangular cross-section metal spring strip, with its central through hole passing through and fitted onto the displacement control rod (3).

4. The rigid-flexible elastic resetting seamless expansion joint structure as described in claim 3, characterized in that, The sliders (5) are fixedly connected to the two end faces of the rectangular cross-section spring (6), and the inner hole of each slider (5) forms a sliding fit with the displacement control rod (3).

5. The rigid-flexible elastic resetting seamless expansion joint structure as described in claim 4, characterized in that, The angle steel (4) is an L-shaped steel component arranged along the transverse direction and fixed to the outside of the slider (5); the horizontal limb plate of the angle steel (4) is provided with a hole for the first vertical anchor rod (11) to pass through; the vertical limb plate of the angle steel (4) is provided with a hole for the displacement control rod (3) to pass through; the angle steel (4) is provided with a spacer rib.

6. The rigid-flexible elastic resetting seamless expansion joint structure as described in claim 5, characterized in that, The rubber sleeve (7) is a cylindrical part made of elastic rubber, which is fitted onto both ends of the displacement control rod (3); one end abuts against the outer side of the angle steel (4), and the other end abuts against the end face of the displacement control rod (3), with the inner wall of the hole fitting the rod body.

7. The rigid-flexible elastic resetting seamless expansion joint structure as described in claim 5, characterized in that, The first vertical anchor rod (11) is a vertically installed metal rod. Its rod is inserted through the hole in the horizontal limb plate of the angle steel (4) and extends downward into the concrete of the beam (1). The upper end of the rod is locked by a fastening device.

8. The rigid-flexible elastic resetting seamless expansion joint structure as described in claim 1, characterized in that, The arched corrugated steel plate (10) is a metal plate arranged along the driving direction. Its cross-section is continuously corrugated and the whole is bent to form an arched structure. The top of the steel plate is located directly above the elastic telescopic structure. The arch foot areas at both ends are fixedly connected to the beams (1) on both sides through the second vertical anchor rod (17).

9. The rigid-flexible elastic resetting seamless expansion joint structure as described in claim 8, characterized in that, The second vertical anchor rod (17) is a vertically installed metal rod with its rod body passing through a hole at the end of the arched corrugated steel plate (10) and extending downward into the concrete of the beam (1). The upper end of the rod body is locked by a fastening device.

10. The rigid-flexible elastic resetting seamless expansion joint structure as described in claim 1, characterized in that, The planar corrugated steel plate (16) is a planar corrugated metal plate with a continuous corrugated cross section. It is horizontally mounted above the elastic telescopic structure, and its two ends are directly supported on the upper surface of the angle steel (4) on both sides of the elastic telescopic structure.

11. The rigid-flexible elastic resetting seamless expansion joint structure as described in claim 1, characterized in that, The polyurethane elastic concrete (9) is a composite material made of polyurethane and aggregate. After curing, it forms a seamless continuous solid filler that completely fills and closely adheres to the gaps between all internal components of the elastic expansion structure and the rigid support structure.

12. The rigid-flexible elastic resetting seamless expansion joint structure as described in claim 1, characterized in that, The length of the cross-joint steel plate (8) is symmetrically distributed on both sides of the center line of the expansion joint, and its bottom surface is ground flat to form a plane.

13. The rigid-flexible elastic resetting seamless expansion joint structure as described in claim 1, characterized in that, The backing plate (12) is made of closed-cell polyethylene foam or rubber foam material.

14. The rigid-flexible elastic resetting seamless expansion joint structure as described in claim 1, characterized in that, The precast elastic cover plate (15) is precast from polyurethane elastic concrete and is set on top of the polyurethane elastic concrete (9). The bottom surface is bonded to the polyurethane elastic concrete (9) by the first sealant (13), the top surface is flush with the asphalt layer (2), and the two sides are seamlessly bonded to the asphalt layer (2) by the second sealant (14).

15. The rigid-flexible elastic resetting seamless expansion joint structure as described in claim 14, characterized in that, The first sealant (13) and the second sealant (14) are polyurethane modified elastic materials; wherein, the bottom surface of the first sealant (13) is seamlessly attached to the upper surface of the polyurethane elastic concrete (9), and the top surface is seamlessly attached to the lower surface of the precast elastic cover plate (15); the bottom surface of the second sealant (14) is seamlessly attached to the upper surface of the backing plate (12), the top surface is flush with the top surface of the asphalt layer (2), and the two sides are respectively bonded to the asphalt layer (2) and the precast elastic cover plate (15); the two sides of the first sealant (13) are connected to the second sealant (14).

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