Prefabricated telescopic block and method, bridge deck continuous waveform telescopic hidden seam and method and bridge

Abstract

The invention relates to a prefabricated telescopic block and method, a bridge deck continuous waveform telescopic hidden seam and method and a bridge, the prefabricated telescopic block is arranged in mounting notches of two sections of main beam bodies, and it is guaranteed that the road top face at the telescopic seam is still flush; due to the fact that the prefabricated telescopic block is coupled with the elastic material through the vertical waveform of the corrugated steel plate to form the combined elastic body, one end of the staggered cantilever stiffening steel bar is arranged in the elastic material, the corrugated steel plate and the staggered cantilever stiffening steel bar play a role in improving the vertical supporting rigidity of the combined elastic body, and driving smoothness is guaranteed. The outer surfaces of the built-in areas of the staggered cantilever stiffening steel bars and the combined elastic bodies can relatively slide in the longitudinal bridge direction, it is guaranteed that the combined elastic bodies can be freely pulled and pressed to deform in the longitudinal bridge direction, the basic deformation function of the expansion joint is achieved, the bridge structure is higher in safety, and the service life is prolonged. And sliding between the outer surface of the built-in area of the staggered cantilever stiffening steel bar and the combined elastic body in the longitudinal bridge direction is small, damage to the combined elastic body is small, and the service life is longer.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge expansion joints, and particularly to prefabricated expansion blocks and methods, continuous corrugated expansion hidden joints on bridge decks and methods, and bridges. Background Art

[0002] Expansion joints are common accessory structures in bridge engineering. They are usually set at the bridge deck connection positions between two bridge spans and between the bridge end and the abutment to compensate for the bridge deformation caused by temperature loads, live loads under normal conditions, and earthquake loads, impact loads, settlement displacements, etc. in case of emergencies, release the internal forces of the main bridge structure, and avoid causing structural damage.

[0003] Under the influence of daily and annual temperature differences, the beam body expands and contracts thermally, and the expansion joint is accordingly squeezed and stretched. Under the action of live loads, the beam end rotates upward, and the expansion joint undergoes bending deformation accordingly. Therefore, it is necessary to have longitudinal bridge linear stiffness and rotational stiffness matching the structure to adapt to the deformation, and the structure needs to meet the fatigue resistance performance requirements of repeated expansion and bending deformations. As a connection structure of the bridge deck structure, the expansion joint needs to have a certain vertical stiffness to ensure the continuity of the bridge deck and the driving comfort. Under the action of vehicle flow, the expansion joint is repeatedly subjected to vehicle impact loads, and the surface and the weak connection surface of the structure are easily damaged, so it needs to have high durability. In addition, the expansion joint should also take into account many functions such as dust prevention, seepage prevention, shock absorption and noise reduction, convenient construction and replacement.

[0004] Through years of engineering applications, it has been found that traditional comb-tooth type expansion joints and modular expansion joints have many problems: (1) After the expansion joint adapts to the rotation of the beam end, the steel profile bulges upward, resulting in vehicle jumping when the vehicle passes, seriously affecting the driving comfort; (2) The gaps between the steel profiles on the top surface of the expansion joint cannot prevent rain, snow and dust, resulting in the accumulation of water and dirt, affecting the deformation ability of the expansion joint; (3) The stiffness transition from the bridge deck to the expansion joint is not smooth, resulting in an increase in vehicle load impact and serious wear and cracking of the concrete on the connection surface with the steel profile.

[0005] The design concept of the existing seamless expansion joint is as follows: an elastic material is directly filled in the reserved notch between beam bodies to form an elastomer to adapt to the deformation of the beam end. In addition, springs may be used in combination with the elastomer to achieve free deformation of the expansion joint through the springs and the elastomer. The above seamless expansion joint solution solves the technical problems of the above traditional expansion joints to a certain extent. However, through experimental verification, there are new application difficulties with the seamless expansion joint: (1) The anchoring connection between the existing elastic material and the concrete bridge surface layer is weak. During expansion and contraction deformation, the top surface of the connection surface flakes off first, resulting in poor durability; (2) If an asphalt layer is covered on the top surface of the elastomer, the stiffness difference between the two is large and they cannot deform synergistically. If the elastomer in the expansion joint area is directly poured flush with the top surface of the bridge asphalt layer, that is, the elastomer is directly subjected to the wheel load, the adhesive force and impact of the wheels on the top surface of the elastomer will accelerate the peeling of the elastomer from the concrete bridge surface layer; (3) Compared with the bridge deck pavement on both sides, the vertical stiffness of the expansion joint elastomer is smaller, affecting the smoothness of driving; (4) For the seamless expansion joint with springs combined with the elastomer, there is also the disadvantage that the contact surface between the springs and the elastomer is complex and prone to debonding;

[0006] In view of the above disadvantages, the Chinese utility model patent with the authorization announcement number CN219824886U discloses a bridge seamless expansion joint structure, which discloses a combined elastomer formed by a corrugated steel plate in combination with an elastic material, and anchor boxes are arranged on both sides, and telescopic rods are connected in the middle. Although it solves the disadvantage of weak vertical stiffness of the expansion joint structure, it still has the following technical problems:

[0007] (1) The elastomer formed by the corrugated steel plate in combination with the elastic material undergoes uniform deformation during expansion and contraction deformation, while the device of the anchor box combined with the telescopic rod concentrates the deformation amount on one cross-section during longitudinal expansion and contraction deformation. The principles of the two systems for adapting longitudinal deformation are different, resulting in too large shear stress on the contact surface and relative slip on the connection surface, thereby damaging the inside of the expansion structure and affecting the structural life;

[0008] (2) The device of the anchor box combined with the telescopic rod can adapt to longitudinal expansion and contraction deformation, but it is difficult to adapt to the bending deformation of the expansion joint caused by the beam end rotation angle, resulting in the inability to release the internal force of the main beam and affecting the safety of the bridge structure. Summary of the Invention

[0009] The purpose of the present invention is to overcome the deficiencies in the existing bridge seamless expansion joint structure, where the internal structure of the expansion structure is prone to damage, affecting the structural life, and the device of the anchor box combined with the telescopic rod is difficult to adapt to the bending deformation of the expansion joint caused by the beam end rotation angle, resulting in the inability to release the internal force of the main beam and affecting the safety of the bridge structure, and to provide precast expansion blocks and methods, continuous corrugated expansion hidden joints for bridge decks and methods, and bridges.

[0010] In the first aspect, the present invention provides a precast expansion block, comprising:

[0011] Stiffening expansion plate, the stiffening expansion plate includes a corrugated steel plate in the middle in the longitudinal bridge direction and end plates arranged at both ends in the longitudinal bridge direction. The corrugated steel plate has vertical corrugations, and the vertical corrugations are continuously arranged in the longitudinal bridge direction. The end plates are used to be anchored to the bridge deck concrete layer of the bridge deck paving above the main beam body and / or the main beam body;

[0012] Elastic material, the elastic material is arranged above the corrugated steel plate and between the two end plates at both ends. The elastic material and the corrugated steel plate form a combined elastic body through the coupling of the vertical corrugations, and the elastic material is respectively connected to the opposite side surfaces of the two end plates;

[0013] Displaced cantilever stiffening steel bars, the displaced cantilever stiffening steel bars are used to be arranged on both sides of the expansion joint. The displaced cantilever stiffening steel bars are arranged along the longitudinal bridge direction, and the displaced cantilever stiffening steel bars are arranged at equal intervals in the transverse bridge direction. The displaced cantilever stiffening steel bars on both sides of the expansion joint are staggered. One end of the displaced cantilever stiffening steel bar penetrates into the combined elastic body through the opening of the end plate, and the other end of the displaced cantilever stiffening steel bar is used to be anchored to the corresponding bridge deck concrete layer and / or the main beam body.

[0014] In this solution, compared with a simple elastic material, the elastic material and the corrugated steel plate form a combined elastic body through the coupling of the vertical corrugations. The corrugated steel plate provides greater vertical stiffness for the combined elastic body, can form a rigid support for the upper wheel load, and ensure the smoothness of driving. Moreover, the vertical corrugations of the corrugated steel plate are continuously arranged in the longitudinal bridge direction, so that the axial tensile and compressive stiffness and bending stiffness in the longitudinal bridge direction are less than those in the transverse bridge direction. The end plates at both ends of the corrugated steel plate can be anchored to the bridge deck concrete layer of the bridge deck paving above the main beam body on the corresponding side of the expansion joint and / or the main beam body, ensuring that it can be installed and used at the expansion joint;

[0015] Compared with the prior art, one end of the displaced cantilever stiffening steel bar penetrates into the combined elastic body through the opening of the end plate, which plays a role in increasing the vertical stiffness of the combined elastic body and providing vertical support; the other end plays a role in anchoring and fixing the combined elastic body to the bridge deck concrete layer of the bridge deck paving above the main beam body and / or the main beam body; since the relative sliding amount of the displaced cantilever stiffening steel bars on both sides of the expansion joint with respect to the elastic material is smaller than that of the prior art, the damage to the elastic material is reduced, making the structure have a longer service life; and the displaced cantilever stiffening steel bars on both sides of the expansion joint are staggered, which can adapt to the longitudinal expansion and contraction deformation and can also adapt to the bending deformation of the expansion joint caused by the beam end rotation, thus not affecting the release of the internal force of the main beam and making the bridge structure safer.

[0016] Preferably, the staggered spacing of the displaced cantilever stiffening steel bars on both sides of the expansion joint in the transverse bridge direction is 5 cm - 20 cm, which can preferably provide vertical stiffness and the anchoring ability with the bridge main body;

[0017] and / or,

[0018] The wave pitch d of the corrugated steel plate is 5 cm - 15 cm, and the inclination angle α of the inclined web of the corrugated steel plate is 5° - 15°. The design of such a small wave pitch and small angle can increase the number of waves within the length of the finite expansion joint, reduce the deformation borne by a single wave, and improve the overall deformation capacity;

[0019] The bending radius R of the wave crest and wave trough of the corrugated steel plate is greater than or equal to 1 cm. Such a large bending radius facilitates the realization of mechanical manufacturing and can also improve the bending deformation capacity of a single wave crest and wave trough.

[0020] Preferably, the wave crest at the top and the wave trough at the bottom of the corrugated steel plate are thinned areas.

[0021] The corrugated steel plate is thinned at the wave crest at the top and the wave trough at the bottom, weakening the out-of-plane stiffness of this area and enhancing the out-of-plane bending deformation capacity. The corrugated steel plate dissipates the structural internal force generated by temperature load, live load, etc. of the bridge structure by changing the bending degree at the wave crest and wave trough, adapts to the longitudinal expansion and bending deformation of the combined elastomer, and plays the function of compensating deformation of the expansion joint.

[0022] Preferably, the thickness of the corrugated steel plate is 3 mm - 6 mm, and the thickness of the thinned area is 0.5 mm - 3 mm. Specifically, the wave crest and wave trough are thinned because the wave crest and wave trough are the main areas for the combined elastomer to release longitudinal deformation. Thinning these two places can greatly reduce the longitudinal axial tensile and compressive stiffness of the combined elastomer. Choosing to thin only these two areas instead of directly making the whole plate into a thinner thickness is because the overall thickness can provide more effective vertical support stiffness. Taking a 6 mm thick corrugated steel plate, a 3 mm thick corrugated steel plate, and a 6 mm overall thickness with a local thinning to 3 mm corrugated steel plate of the same size as examples, calculating the longitudinal elastic modulus, they are 5.8 MPa, 0.7 MPa, and 1.0 MPa respectively. That is, the weakening effect of local thinning on the longitudinal stiffness of the plate can reach 94% of that of overall thinning, which can ensure the bearing capacity and deformation capacity.

[0023] The vertical height of the thinned area is 2 cm - 3 cm. The thinned area should cover the wave crest and wave trough areas to avoid stress concentration at the thickness change section of the corrugated steel plate and affect the fatigue life of the steel plate.

[0024] Preferably, the two end head plates are L-shaped and arranged opposite to each other. The horizontal plates of the L-shape are located on the upper side of the vertical plates and are arranged opposite to each other. The upper side horizontal plates of the two end head plates are connected to the wave crest at the corresponding end of the corrugated steel plate;

[0025] Or, the two end head plates are L-shaped and arranged opposite to each other. The horizontal plates of the L-shape are located on the lower side of the vertical plates and are arranged opposite to each other. The lower side horizontal plates of the two end head plates are connected to the wave trough bottom at the corresponding end of the corrugated steel plate.

[0026] The above - mentioned method of connecting to the bottom or top of the wave trough of the corrugated steel plate corresponding to the end through the L - shaped cross - plate is convenient and stable in connection.

[0027] Preferably, a number of perforated steel plates are welded to the side of the end - head plate facing away from the elastic material. The perforated steel plates are arranged along the longitudinal bridge direction. The perforated steel plates welded on each end - head plate are spaced apart along the transverse bridge direction. The perforated steel plates are used to be embedded in the bridge deck concrete layer on the corresponding side of both sides of the expansion joint. Through the shear - resistant tenons formed by the concrete in the holes of the perforated steel plates, the prefabricated expansion blocks are anchored to the bridge deck concrete layer, and the connection stability is high.

[0028] Preferably, the width of the perforated steel plates in the longitudinal bridge direction is set to at least two kinds, and the perforated steel plates with different widths in the longitudinal bridge direction are arranged alternately in the transverse bridge direction of the end - head plate.

[0029] The width of the perforated steel plates along the longitudinal bridge direction is set to two or more sizes, and different sizes are placed alternately in the transverse bridge direction, preventing stress concentration in the bridge deck concrete layer due to sudden changes in stiffness, resulting in the cross - section in the transverse bridge direction where the edge of the perforated steel plate is located becoming a vulnerable weak surface, affecting the service life of the continuous corrugated expansion joint on the bridge deck and the riding comfort.

[0030] In a second aspect, the present invention provides a continuous corrugated expansion joint on the bridge deck. The continuous corrugated expansion joint on the bridge deck is flush with the top surface of the bridge deck paving above the main beam bodies on both sides of the expansion joint, and includes:

[0031] Two adjacent main beam bodies of the bridge. Opposite installation notches are provided at the ends of the two main beam bodies on both sides of the expansion joint. A toothed plate is fixedly installed at the bottom of each installation notch. The toothed plate is provided with a number of teeth along the transverse bridge direction. The teeth of the toothed plate face the direction of the expansion joint and extend beyond the installation notch. The teeth of the toothed plates on both sides of the expansion joint are arranged with staggered joints in the transverse bridge direction.

[0032] The bridge deck paving, which includes a bridge deck concrete layer and an asphalt concrete layer. The bridge deck concrete layer is laid on the upper surface of the main beam body and covers the installation notch, and the asphalt concrete layer is laid above the bridge deck concrete layer.

[0033] The prefabricated expansion blocks are arranged in the installation notches on both sides of the expansion joint of the two main beam bodies. The end - head plate and the staggered cantilever stiffening steel bars of the prefabricated expansion blocks are respectively anchored to the bridge deck concrete layer on the corresponding side on both sides of the expansion joint and / or the part of the main beam body located in the installation notch at one end of the main beam body close to the expansion joint.

[0034] The present invention provides a continuous bridge deck corrugated expansion hidden joint. Prefabricated expansion blocks are arranged in the installation notches of two main beam bodies, ensuring that the top surface of the continuous bridge deck corrugated expansion hidden joint is flush with the top surface of the bridge deck paving above the main beam bodies on both sides of the expansion joint. Since the prefabricated expansion blocks form a combined elastic body through the vertical corrugations of the corrugated steel plate and the elastic material, and the combined elastic body is internally provided with misaligned cantilever stiffening steel bars on both sides along the longitudinal bridge direction, one end of the misaligned cantilever stiffening steel bars is internally placed in the elastic material. Both the misaligned cantilever stiffening steel bars and the corrugated steel plate can enhance the vertical stiffness of the combined elastic body, forming a rigid support for the upper wheel load and ensuring the smoothness of driving. Moreover, the end plates at both ends of the corrugated steel plate and the misaligned cantilever stiffening steel bars are jointly used for the connection between the prefabricated expansion blocks and the bridge deck concrete layer and / or the main beam body, enhancing the connection ability and making the structure more stable. And the end plates and the misaligned cantilever stiffening steel bars are both anchored in the installation notches, making the replacement of the prefabricated expansion blocks more convenient. The vertical corrugations of the corrugated steel plate are continuously arranged along the longitudinal bridge direction, making the axial tensile and compressive stiffness and flexural stiffness in the longitudinal bridge direction less than those in the transverse bridge direction, forming an orthotropic structure. The outer surface of the area where the misaligned cantilever stiffening steel bars are internally placed can slide relative to the combined elastic body in the longitudinal bridge direction, ensuring that the combined elastic body can freely stretch and compress in the longitudinal bridge direction, meeting the basic deformation function of the expansion joint and making the bridge structure safer. And the sliding of the outer surface of the area where the misaligned cantilever stiffening steel bars are internally placed relative to the combined elastic body in the longitudinal bridge direction is smaller than that of the prior art, causing less damage to the combined elastic body and having a higher service life.

[0035] Preferably, the wave height D of the corrugated steel plate is 1 cm - 2 cm smaller than the height of the bridge deck concrete layer in the installation notch; this can not only reduce the connection surface area between the elastic material and the bridge deck concrete layer but also prevent this connection surface from becoming a weak surface and being damaged first under tensile and compressive deformations, thereby avoiding the occurrence of vehicle jumping and affecting driving comfort.

[0036] and / or,

[0037] A covering layer is provided on the top of the prefabricated expansion block, and the top surface of the covering layer is flush with the top surface of the bridge deck paving. The covering layer serves as the direct acting layer for the wheel load, protecting the elastic material from wear and improving the service life of the continuous bridge deck corrugated expansion hidden joint.

[0038] In the third aspect, the present invention provides a prefabrication method for prefabricated expansion blocks for prefabricating the prefabricated expansion blocks.

[0039] The prefabrication method includes the following steps:

[0040] ① Roll the corrugated steel plate and the end plates according to the design dimensions to form a stiffened expansion plate. Thin the peak and valley regions of the corrugated steel plate, and drill holes in both the end plates and the corrugated steel plate and insert misaligned cantilever stiffening steel bars.

[0041] ② Place the corrugated steel plate with the misaligned cantilever stiffening steel bars properly installed upright, pour the elastic material above the corrugated steel plate, and let it stand until it solidifies and forms, completing the prefabrication of the precast expansion block.

[0042] Wherein, when the end plate is provided with a perforated steel plate, it further includes welding the perforated steel plates on the end plates at both ends of the corrugated steel plate.

[0043] The prefabrication method of the precast expansion block of the present invention has a better forming effect and can improve the prefabrication quality of the precast expansion block.

[0044] In a fourth aspect, the present invention provides a construction method for a continuous deck corrugated expansion hidden joint, used for constructing the continuous deck corrugated expansion hidden joint described above, including the following steps:

[0045] S1: Reserve an installation notch at the top of one end of the main beam body close to the expansion joint, and fixedly install a toothed plate in the installation notch.

[0046] S2: Install the precast expansion block into the reserved installation notch at the top of the main beam body.

[0047] S3: Fix the misaligned cantilever stiffening steel bars of the precast expansion block through the downward pulling structure in the installation notch.

[0048] S4: Pour the bridge deck concrete layer and the asphalt concrete layer of the bridge deck pavement in sequence; wherein, when the continuous deck corrugated expansion hidden joint includes a covering layer, after pouring the asphalt concrete layer, it further includes constructing the covering layer above the precast expansion block.

[0049] The construction method of the continuous deck corrugated expansion hidden joint of the present invention can construct the continuous deck corrugated expansion hidden joint quickly and safely.

[0050] In a fifth aspect, the present invention provides a bridge including the continuous deck corrugated expansion hidden joint described above.

[0051] Compared with the prior art, the beneficial effects of the present invention are:

[0052] 1. The present invention provides a precast expansion block. Since the precast expansion block forms a combined elastic body through the vertical corrugations of the corrugated steel plate and the elastic material, and one end of the misaligned cantilever stiffening steel bar is built into the elastic material, the corrugated steel plate and the misaligned cantilever stiffening steel bar play a role in improving the vertical support stiffness of the combined elastic body, ensuring smooth driving; the outer surface of the built-in area of the misaligned cantilever stiffening steel bar can slide relative to the combined elastic body in the longitudinal bridge direction, ensuring that the combined elastic body can freely stretch and compress in the longitudinal bridge direction, meeting the basic deformation function of the expansion joint, making the bridge structure safer, and the sliding of the outer surface of the built-in area of the misaligned cantilever stiffening steel bar relative to the combined elastic body in the longitudinal bridge direction is small, resulting in less damage to the combined elastic body and a higher service life.

[0053] 2. The present invention provides a continuous deck waveform expansion hidden joint. Prefabricated expansion blocks are arranged in the installation notches of two main beam bodies to ensure that the top surface of the continuous deck waveform expansion hidden joint is flush with the top surface of the deck paving above the main beam bodies on both sides of the expansion joint. Since the prefabricated expansion blocks form a combined elastic body through the vertical waveform of the corrugated steel plate and the coupling of elastic materials, and the combined elastic body is internally provided with misaligned cantilever stiffening steel bars on both sides along the longitudinal bridge direction, one end of the misaligned cantilever stiffening steel bars is internally placed in the elastic material. Both the misaligned cantilever stiffening steel bars and the corrugated steel plate can enhance the vertical stiffness of the combined elastic body, form a rigid support for the upper wheel load, and ensure the smoothness of driving. Moreover, the end plates at both ends of the corrugated steel plate and the misaligned cantilever stiffening steel bars are jointly used for connecting the prefabricated expansion blocks with the deck concrete layer and / or the main beam body, enhancing the connection ability and making the structure more stable. The vertical waveform of the corrugated steel plate is continuously arranged along the longitudinal bridge direction, making the axial tensile and compressive stiffness and flexural stiffness in the longitudinal bridge direction less than those in the transverse bridge direction, forming an orthotropic structure. The outer surface of the area where the misaligned cantilever stiffening steel bars are internally placed can slide relative to the combined elastic body in the longitudinal bridge direction, ensuring that the combined elastic body can freely stretch and compress in the longitudinal bridge direction, meeting the basic deformation function of the expansion joint, making the bridge structure safer. Moreover, the sliding of the outer surface of the area where the misaligned cantilever stiffening steel bars are internally placed relative to the combined elastic body in the longitudinal bridge direction is smaller than that of the prior art, causing less damage to the combined elastic body and having a higher service life.

[0054] 3. The present invention provides a prefabrication method for prefabricated expansion blocks, which has a better forming effect and can improve the prefabrication quality of the prefabricated expansion blocks.

[0055] 4. The present invention provides a construction method for a continuous deck waveform expansion hidden joint, which can construct the continuous deck waveform expansion hidden joint quickly and safely.

[0056] 5. The present invention provides a bridge with high structural safety and good smoothness of the road above the bridge. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 is a structural schematic diagram of the prefabricated expansion block described in the present invention;

[0058] Figure 2 is a first structural schematic diagram of the continuous deck waveform expansion hidden joint described in the present invention;

[0059] Figure 3 is a longitudinal sectional view of the first structure of the continuous deck waveform expansion hidden joint described in the present invention;

[0060] Figure 4 is a structural schematic diagram of the toothed plate of the first structure of the continuous deck waveform expansion hidden joint described in the present invention;

[0061] Figure 5It is a bottom view schematic diagram of the continuous corrugated expansion hidden joint on the bridge deck described in the present invention;

[0062] Figure 6 It is a longitudinal section schematic diagram of the second structure of the continuous corrugated expansion hidden joint on the bridge deck described in the present invention;

[0063] Figure 7 It is a structural schematic diagram of the toothed plate of the continuous corrugated expansion hidden joint on the bridge deck described in the present invention;

[0064] Figure 8 is Figure 2 and Figure 5 The top view at A-A in

[0065] Markings in the figure: 11, installation notch; 101, main beam body; 102, expansion joint; 2, bridge deck pavement; 201, bridge deck concrete layer; 202, asphalt concrete layer; 3, precast expansion block; 301, toothed plate; 302, corrugated steel plate; 321, weak area; 303, elastic material; 304, misaligned cantilever stiffening steel bar; 341, pull-down structure; 305, perforated steel plate; 306, end plate; 307, smooth sleeve; 401, covering layer. Specific embodiments

[0066] The present invention will be further described in detail below in conjunction with specific embodiments. However, this should not be construed as limiting the scope of the above-mentioned subject matter of the present invention to the following embodiments. Any technology implemented based on the content of the present invention belongs to the scope of the present invention.

[0067] In the description of the specific embodiments of the present invention, without special explanation, the expression terms indicating the orientation or positional relationship such as "upper", "lower", "left", "right", "center", "inner", "outer", etc. are all based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the invention product / device / device is commonly used and placed. These terms of orientation or positional relationship are only for the convenience of describing the solution of the present invention or simplifying the description in the specific embodiments, so as to facilitate technicians to quickly understand the solution, rather than indicating or implying that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship, so it cannot be understood as a limitation to the present invention.

[0068] In addition, when terms such as "horizontal", "vertical", "hanging", "parallel" appear, it does not mean that the corresponding device / component / element is required to be absolutely horizontal or vertical or hanging or parallel, but it can be slightly inclined or deviated. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and it does not mean that the structure must be completely horizontal, but it can be slightly inclined. Or, it can be simply understood that the corresponding device / component / element is arranged in the directions of "horizontal", "vertical", "hanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, more preferably an error / deviation within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still perform its function in the solution of the present invention.

[0069] In addition, when expressions such as "first", "second", "third" appear in the terms, they are only used to distinguish the description of the same or similar components, and should not be understood as emphasizing or implying the relative importance of specific components.

[0070] In addition, in the description of the embodiments of the present invention, "several", "multiple", "a number of" represent at least 2. It can be any case of 2, 3, 4, 5, 6, 7, 8, 9, etc., and even can be a case of more than 9.

[0071] In addition, in the description of the technical solution of the present invention, unless otherwise clearly specified / defined / restricted, when terms such as "set", "installed", "connected", "coupled", "provided with", "laid", "arranged" appear, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be connection means commonly used in the art such as welding, riveting, bolting, threaded connection, etc. This kind of connection can be a mechanical connection, an electrical connection or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components.

[0072] Embodiment 1

[0073] The present invention provides a precast expansion block 3, see Figure 1 , including: a stiffening expansion plate, an elastic material 303, and a staggered cantilever stiffening steel bar 304.

[0074] Wherein, Figures 1 - 8 the left - right direction is the longitudinal bridge direction of the bridge, Figures 1 - 8 the up - down direction in Figure 1 is the vertical direction. As Figure 4 or Figure 7As shown in the figure, the stiffening expansion plate includes a corrugated steel plate 302 in the middle in the longitudinal bridge direction and end plates 306 arranged at both ends in the longitudinal bridge direction. The corrugated steel plate 302 has vertical corrugations, and the vertical corrugations are continuously arranged in the longitudinal bridge direction, that is, the axial tension-compression stiffness and flexural stiffness in the longitudinal bridge direction are smaller than those in the transverse bridge direction; the elastic material 303 is arranged above the corrugated steel plate 302 and between the two end plates 306 at both ends. The elastic material 303 is respectively connected to the opposite side surfaces of the two end plates 306 at both ends. For example, the left side of the elastic material 303 can be pasted to the right side of the left end plate 306, and the right side of the elastic material 303 can be pasted to the left side of the right end plate 306. The elastic material 303 and the corrugated steel plate 302 form a combined elastic body through the coupling of the vertical corrugations; the corrugated steel plate 302 refers to a steel plate structure that is rolled into a corrugated or wavy shape in one direction, so that the axial tension-compression stiffness and flexural stiffness of the corrugated steel plate 302 in two orthogonal directions of the transverse bridge direction and the longitudinal bridge direction have large differences.

[0075] The elastic material 303 includes, but is not limited to, elastic materials 303 such as polyurethane, polyurea grouting liquid, and rubber with small stiffness, large elasticity, and good bonding performance with concrete and steel. For the 80-type expansion joint 102, the hardness of the elastic material 303 is 20A-50A (Shore), and the tensile elastic modulus ≤ 0.6 MPa; for the 160-type expansion joint 102, the hardness of the elastic material 303 is 20A-30A (Shore), and the tensile elastic modulus ≤ 0.5 MPa, ensuring that the formed combined elastic body has a small enough stiffness to meet the deformation requirements under the design load. The tensile strength of the elastic material 303 ≥ 3.0 MPa, the bonding strength ≥ 1.5 MPa, and the elongation at break ≥ 900%, ensuring that under the ultimate deformation amount, the continuous corrugated expansion hidden joint on the bridge deck will not cause debonding failure at the connection surface between the elastic material 303 and steel and concrete, and the combined elastic body will not crack due to the internal force being greater than the tensile strength. Compared with the pure elastic material 303, the corrugated steel plate 302 provides a greater vertical stiffness for the combined elastic body, can form a rigid support for the upper wheel load, and ensure the smoothness of driving. In this embodiment, the corrugated steel plate 302 strengthens the vertical stiffness of the elastic material 303 and increases the coupling area with the elastic material 303, and the coupling effect is better.

[0076] In an optional implementation manner, as Figure 4 and Figure 7 shown, the wave pitch d of the corrugated steel plate 302 is 5 cm - 15 cm, and the inclination angle α of the inclined web of the corrugated steel plate 302 is 5° - 15°. This design of small wave pitch and small angle can increase the number of waves within the length of the limited expansion joint 102, reduce the deformation amount borne by a single wave, and improve the overall deformation ability; the bending radius R of the wave crest and wave trough of the corrugated steel plate 302 is greater than or equal to 1 cm. This large bending radius is convenient for the realization of mechanical manufacturing and can also improve the bending deformation ability of a single wave crest and wave trough.

[0077] In an alternative embodiment, as Figure 4 and Figure 7 shown, the top peaks and bottom valleys of the corrugated steel plate 302 are thinned areas. The corrugated steel plate 302 is thinned at the top peaks and bottom valleys to weaken the out-of-plane stiffness of this area and enhance the out-of-plane bending deformation ability. The corrugated steel plate 302 dissipates the structural internal forces generated by the bridge structure due to temperature loads, live loads, etc. by changing the bending degree at the peaks and valleys, adapts to the longitudinal expansion and bending deformation of the composite elastomer, and functions as a compensation deformation for the continuous corrugated expansion joint on the bridge deck.

[0078] Furthermore, the thickness of the corrugated steel plate 302 is 3 mm - 6 mm, and the thickness of the thinned area is 0.5 mm - 3 mm, which can ensure the bearing capacity and deformation ability; the vertical height of the thinned area is 2 cm - 3 cm, and the thinned area should cover the peak and valley areas to avoid stress concentration at the thickness change section of the corrugated steel plate 302, which affects the fatigue life of the steel plate. Specifically, the peaks and valleys are thinned because the peaks and valleys are the main areas for the composite elastomer to release longitudinal deformation. Thinning these two areas can significantly reduce the longitudinal axial tensile and compressive stiffness of the composite elastomer. The reason for choosing to thin only these two areas instead of making the entire plate into a thinner plate is that the overall thickness can provide more effective vertical support stiffness. Taking a 6-mm-thick corrugated steel plate, a 3-mm-thick corrugated steel plate, and a 6-mm-thick overall with a local thinning to 3-mm corrugated steel plate of the same size as an example, the longitudinal elastic modulus is calculated to be 5.8 MPa, 0.7 MPa, and 1.0 MPa respectively, that is, the weakening effect of local thinning on the longitudinal stiffness of the plate can reach 94% of overall thinning, which can ensure the bearing capacity and deformation ability.

[0079] In this embodiment, the end plates 306 are fixedly connected to both ends of the corrugated steel plate 302.

[0080] In an alternative embodiment, the two end plates 306 are L-shaped and arranged opposite to each other. The horizontal plates of the L-shaped are located above the vertical plates and are arranged opposite to each other, as Figures 1 - 4 shown, the upper horizontal plates of the two end plates 306 are connected to the wave crests at the corresponding ends of the corrugated steel plate 302;

[0081] In an alternative embodiment, the two end plates 306 are L-shaped and arranged opposite to each other. The horizontal plates of the L-shaped are located below the vertical plates and are arranged opposite to each other, as Figures 6 - 7 shown, the lower horizontal plates of the two end plates 306 are connected to the wave troughs at the corresponding ends of the corrugated steel plate 302. The above method of connecting the L-shaped horizontal plates to the wave troughs or wave crests at the corresponding ends of the corrugated steel plate 302 is convenient and stable.

[0082] As Figure 2 and Figure 3As shown in the figure, the bridge deck paving 2 includes a bridge deck concrete layer 201 cast on the upper surface of the bridge main body and an asphalt concrete layer 202 laid on the upper surface of the bridge deck concrete layer 201. Among them, the bridge deck concrete layer 201 covers the installation notch 11 of the main beam body 101 and makes the top surface of the bridge deck concrete layer 201 flush; in this embodiment, the end plate 306 is used to anchor to the bridge deck concrete layer 201 and / or the main beam body 101 of the bridge deck paving 2 above the main beam body 101. The main beam body 101 can be a reinforced concrete structure or a steel structure. Among them, as Figure 2 and Figure 8 shown, the left end plate 306 is used to anchor in the bridge deck concrete layer 201 of the main beam body 101 on the left side of the expansion joint, and the right end plate 306 is used to anchor in the bridge deck concrete layer 201 of the main beam body 101 on the right side of the expansion joint; when the main beam body 101 is a steel structure, the end plate 306 can be anchored to the main beam body 101 by welding.

[0083] In an alternative embodiment, as Figure 3 and Figure 6 shown, a number of perforated steel plates 305 are welded to the side of the end plate 306 facing away from the elastic material 303. The thickness of the perforated steel plate 305 is 2 mm - 6 mm, and the opening diameter is 2 cm - 4 cm. The perforated steel plates 305 are arranged along the longitudinal bridge direction, and the perforated steel plates 305 welded to each end plate 306 are spaced apart along the transverse bridge direction. The perforated steel plates 305 are used to be buried in the corresponding side of the bridge deck concrete layer 201 on both sides of the expansion joint 102, and the anti-shear tenons formed by the concrete in the openings of the perforated steel plates 305 are used to form an anchoring connection between the precast expansion block 3 and the bridge deck concrete layer 201 to ensure the stability of the connection.

[0084] In an alternative embodiment, as Figure 2 、 Figure 5 and Figure 8 shown, the width of the perforated steel plate 305 along the longitudinal bridge direction is set to two or more sizes, and different sizes are alternately placed in the transverse bridge direction to prevent stress concentration in the bridge deck concrete layer 201 due to sudden changes in stiffness, resulting in the cross-sectional surface in the transverse bridge direction where the edge of the perforated steel plate 305 is located becoming a vulnerable weak surface, affecting the service life of the continuous corrugated expansion hidden joint of the bridge deck and the riding comfort.

[0085] Among them, the end plate 306 and the corrugated steel plate 302 can be an integrally formed structure. The end plate 306 can not only serve as the side formwork for pouring the internal elastic material 303, but also serve as the connection surface for welding with the outer perforated steel plate 305.

[0086] The offset cantilever stiffened steel bar 304 is used to be arranged on both sides of the expansion joint 102. The offset cantilever stiffened steel bar 304 is arranged along the longitudinal bridge direction, and the offset cantilever stiffened steel bar 304 is arranged at equal intervals along the transverse bridge direction. The offset cantilever stiffened steel bars 304 on both sides of the expansion joint 102 are arranged staggeredly. One end of the offset cantilever stiffened steel bar 304 passes through the opening of the end plate 306 and penetrates into the combined elastomer, and the other end of the offset cantilever stiffened steel bar 304 is used to be anchored to the bridge deck concrete layer 201 of the bridge deck paving 2 of the corresponding side of the main beam body 101 and / or the main beam body 101, as Figure 2 and Figure 8 shown. The right end of the offset cantilever stiffened steel bar 304 on the left side of the expansion joint 102 passes through the opening of the left end plate 306 and penetrates into the combined elastomer, and the left end is anchored to the bridge deck concrete layer 201 of the bridge deck paving 2 of the left main beam body 101. The left end of the offset cantilever stiffened steel bar 304 on the right side of the expansion joint 102 passes through the opening of the right end plate 306 and penetrates into the combined elastomer, and the right end is anchored to the bridge deck concrete layer 201 of the bridge deck paving 2 of the right main beam body 101. Among them, the offset cantilever stiffened steel bar 304 is pulled down onto the main beam body 101 through the pulling-down structure 341, as Figure 2 and Figure 8 shown. The pulling-down structure 341 is a hooked steel bar arranged on both sides in the transverse bridge direction. The hooked steel bars on both sides in the transverse bridge direction are arranged oppositely in the transverse bridge direction and staggeredly in the longitudinal bridge direction. The lower end of the hooked steel bar is anchored to the main beam body 101, and the upper hook of the hooked steel bar is used to pull down the offset cantilever stiffened steel bar 304 downward.

[0087] In an optional implementation manner, the staggered spacing of the offset cantilever stiffened steel bars 304 on both sides of the expansion joint 102 in the transverse bridge direction is 5 cm - 20 cm, which can preferably provide vertical stiffness and the anchoring ability with the bridge main body.

[0088] In an optional implementation manner, as Figure 3 or Figure 6 shown, the offset cantilever stiffened steel bar 304 is a steel bar member, and a smooth sleeve 307 is sleeved outside the steel bar member. The smooth sleeve 307 passes through the opening of the end plate 306 and penetrates into the combined elastomer. The smooth sleeve 307 is not connected to the end plate 306 and the corrugated steel plate. The wall thickness of the smooth sleeve is 1 mm - 2 mm, which plays a role in protecting the offset cantilever stiffened steel bar 304 from being worn by the edge of the opening of the stiffened expansion plate.

[0089] In this embodiment, compared with the simple elastic material 303, the elastic material 303 and the corrugated steel plate 302 form a combined elastic body through the coupling of vertical corrugations. The corrugated steel plate 302 provides greater vertical stiffness for the combined elastic body, can form a rigid support for the upper wheel load, and ensure the smoothness of driving. Moreover, the vertical corrugations of the corrugated steel plate 302 are continuously arranged along the longitudinal bridge direction, so that the axial tensile and compressive stiffness and flexural stiffness in the longitudinal bridge direction are less than those in the transverse bridge direction. The end plates 306 at both ends of the corrugated steel plate 302 are used to be anchored to the bridge deck concrete layer 201 of the bridge deck paving 2 of the main girder beam body 101 on the corresponding side on both sides of the expansion joint 102 and / or the main girder beam body, ensuring that it can be installed and used at the expansion joint 102. Compared with the prior art, one end of the staggered cantilever stiffening steel bar 304 passes through the opening of the corrugated steel plate 302 and penetrates into the combined elastic body, playing the role of increasing the vertical stiffness of the combined elastic body and providing vertical support; the other end plays the role of anchoring and fixing the combined elastic body to the bridge deck concrete layer 201 of the bridge deck paving 2 of the main girder beam body 101 and / or the main girder beam body. Since the relative sliding amount of the staggered cantilever stiffening steel bars on both sides of the expansion joint with respect to the elastic material is smaller than that in the prior art, the damage to the elastic material is reduced, and the service life of the structure is longer. And the staggered cantilever stiffening steel bars on both sides of the expansion joint are arranged staggeredly, which can adapt to the longitudinal expansion and contraction deformation and can also adapt to the bending deformation of the expansion joint caused by the beam end rotation, so as not to affect the release of the internal force of the main girder, making the bridge structure safer. And the corrugated steel plate 302 is thinned at the top wave crest and the bottom wave trough, weakening the out-of-plane stiffness in this area and enhancing the out-of-plane bending deformation ability. The corrugated steel plate 302 dissipates the structural internal force generated by the temperature load, live load, etc. of the bridge structure by changing the bending degree at the wave crest and wave trough, adapts to the longitudinal expansion and contraction and bending deformation of the combined elastic body, and plays the function of compensating the deformation of the continuous wave expansion and contraction hidden joint on the bridge deck.

[0090] Embodiment 2

[0091] This embodiment provides a prefabrication method for the prefabricated expansion block 3, which is used to prefabricate the prefabricated expansion block 3 described in Embodiment 1 (such as Figure 1 the prefabricated expansion block 3 therein), and the corrugated steel plate 302 of the prefabricated expansion block 3 adopts the corrugated steel plate 302, and the elastic material 303 is coupled to the upper side of the corrugated steel plate 302;

[0092] The prefabrication method includes the following steps:

[0093] ① Roll the corrugated steel plate 302 and the end plate 306 according to the design dimensions to form a stiffened expansion plate, thin the wave crest and wave trough areas of the corrugated steel plate 302, and open holes in both the end plate 306 and the corrugated steel plate 302 and penetrate the staggered cantilever stiffening steel bars 304, that is, make the staggered cantilever stiffening steel bars 304 pass through the end plate 306 and the corrugated steel plate 302 on one side of the expansion joint;

[0094] ②Place the corrugated steel plate 302 with the misaligned cantilever stiffening steel bars 304 inserted upright, pour the elastic material 303 above the corrugated steel plate 302, and let it stand until it solidifies and forms, completing the prefabrication of the prefabricated expansion block.

[0095] Among them, when the end plate 306 is provided with a perforated steel plate 305, it also includes welding the perforated steel plates 305 on the two vertical end plates 306 at both ends of the corrugated steel plate 302.

[0096] In the prefabrication method of the prefabricated expansion block 3 of the present invention, by first placing the corrugated steel plate 302 with the misaligned cantilever stiffening steel bars 304 inserted upright for pouring the elastic material 303 above the corrugated steel plate 302, the forming effect is better, and the prefabrication quality of the prefabricated expansion block 3 can be improved.

[0097] Embodiment 3

[0098] As Figures 2 - 8 shown, this embodiment provides a continuous bridge deck corrugated expansion hidden joint, which is flush with the top surface of the bridge deck pavement above the main beam bodies on both sides of the expansion joint. It includes: two adjacent main beam bodies 101 of the bridge, the bridge deck pavement 2, and the prefabricated expansion block 3 described in Embodiment 1.

[0099] As Figure 2 and Figure 5 shown, opposite installation notches 11 are provided at the ends of the two main beam bodies 101 on both sides of the expansion joint 102; the main beam bodies 101 can be concrete main beams or steel beams of any structural form, and installation notches 11 need to be reserved at the end of the installation expansion joint 102 before pouring or welding to place the prefabricated expansion block 3; a toothed plate is fixedly installed at the bottom of each installation notch. If the main beam body 101 is a reinforced concrete structure, the toothed plate is embedded at the bottom of the installation notch; if the main beam body 101 is a steel structure, the toothed plate is welded to the bottom of the installation notch. The toothed plate is provided with a number of teeth along the transverse direction of the bridge, the teeth of the toothed plate face the direction of the expansion joint and extend beyond the installation notch, and the teeth of the toothed plates on both sides of the expansion joint are staggered in the transverse direction of the bridge, as Figure 5As shown in the figure; the toothed plate 301 is a thin steel plate with a thickness of 0.2 mm - 2 mm, embedded in the inner top surface of the installation notch 11 of the main beam body 101. The toothed plate 301 does not move relative to the corresponding installation notch 11 of the main beam body 101. During the operation stage of the bridge, the toothed plate 301 moves along with the corresponding main beam body 101. The gap between the teeth is used as the longitudinal bridge movement space for the teeth, and the toothed plate 301 can always support the trough at the bottom of the corrugated steel plate of the precast expansion block 3, ensuring the vertical support strength. That is, the toothed structure of the toothed plate 301 enables it to adapt to the spacing change caused by the deformation between the beam bodies, providing vertical support for the stiffening expansion plate while not restricting the longitudinal bridge displacement of the stiffening expansion plate. Moreover, the deformation of the toothed plate 301 caused by the upward warping of the end of the main beam body can be absorbed by the precast expansion block 3, so that the road surface at the expansion joint is still in a flat state, without affecting the passage of vehicles.

[0100] The bridge deck pavement 2 is fixed above the main beam body 101; the bridge deck pavement 2 includes a bridge deck concrete layer 201 and an asphalt concrete layer 202. Figure 2 For example, the main beam body 101 is a reinforced concrete bridge. The bridge deck concrete layer 201 is fixed above the main beam body 101 and covers the installation notch 11. The top surface of the bridge deck concrete layer 201 is flat. The asphalt concrete layer 202 is fixed above the bridge deck concrete layer 201. Specifically, the bridge deck pavement 2 is arranged on the top surface of the main beam body 101 in the non-expansion joint 102 area, which is the same as the conventional structure of a highway bridge. From bottom to top, there are a bridge deck concrete layer 201 with a thickness of 8 cm - 20 cm and an asphalt concrete layer 202 with a thickness of 5 cm - 10 cm.

[0101] In this embodiment, the precast expansion block 3 is arranged in the installation notches 11 on both sides of the expansion joint 102 of two main beam bodies 101. The end plate 306 and the misaligned cantilever stiffening steel bar 304 of the precast expansion block 3 are respectively anchored in the corresponding bridge deck concrete layer 201 on both sides of the expansion joint 102 and / or the part of the main beam body 101 located in the installation notch 11 at one end of the main beam body 101 close to the expansion joint 102. That is, for the convenience of subsequent replacement of the expansion joint, the length of the misaligned cantilever stiffening steel bar 304 is controlled within the length of the installation notch. As Figure 3 shown, the left end of the left misaligned cantilever stiffening steel bar 304 does not extend beyond the left installation notch 11. Among them, the diameter of the misaligned cantilever stiffening steel bar is 8 mm - 20 mm to ensure its support capacity.

[0102] The present embodiment provides a bridge deck continuous corrugated expansion joint, which adopts prefabricated expansion blocks 3 to be arranged in the installation slots 11 of the two sections of the main beam body 101, so as to ensure that the top surface of the bridge deck continuous corrugated expansion joint is flush, because the prefabricated expansion blocks 3 are coupled through the vertical corrugated steel plate 302 and the elastic material 303 to form a combined elastic body, and the elastic material 303 is provided with offset cantilever stiffening steel rods 304 on both sides along the longitudinal direction of the bridge, the offset cantilever stiffening steel rods 304 and the corrugated steel plate 302 can both enhance the vertical stiffness of the combined elastic body, and the toothed plate 301 can support the trough at the bottom of the corrugated steel plate 302, so that the reinforced corrugated steel plate forms a rigid support for the upper wheel load, thereby ensuring the smoothness of driving; and the end plates at both ends of the corrugated steel plate 302 306 and the offset cantilever stiffening steel rod 304 are used together to connect the prefabricated expansion block 3 with the bridge body, so that the connection capacity is enhanced and the structure is more stable; the vertical corrugated steel plate 302 is continuously arranged along the longitudinal direction of the bridge, so that the axial tensile and compressive stiffness and bending stiffness in the longitudinal direction of the bridge are smaller than those in the transverse direction of the bridge, forming an orthogonal anisotropic structure; since the outer surface of the built-in area of the offset cantilever stiffening steel rod and the combined elastomer can slide relative to each other in the longitudinal direction of the bridge, it is ensured that the combined elastomer can be freely tensile and compressively deformed in the longitudinal direction of the bridge, meeting the basic deformation function of the expansion joint, making the bridge structure safer; and the sliding of the outer surface of the built-in area of the offset cantilever stiffening steel rod and the combined elastomer in the longitudinal direction of the bridge is smaller than that of the prior art, the damage to the combined elastomer is less, and the service life is longer.

[0103] Optional implementations, such as Figure 3 and Figure 6 As shown, the wave height D of the corrugated steel plate 302 is 1cm-2cm smaller than the height of the bridge deck concrete layer 201 in the installation groove 11; it can not only reduce the connection surface area between the elastic material 303 and the bridge deck concrete layer 201, but also prevent the connection surface from becoming a weak surface and being damaged first under tension and compression deformation, thereby avoiding the occurrence of vehicle jumping and affecting driving comfort.

[0104] In an optional implementation, when no covering layer 401 is provided on the top of the prefabricated telescopic block 3, the top surface of the combined elastomer is directly flush with the top surface of the bridge deck pavement 2, and the combined elastomer serves as a direct interaction layer with the wheel load to ensure driving smoothness.

[0105] Optional implementations, such as Figure 4 and Figure 7As shown in the figure, a covering layer 401 is provided on the top of the precast expansion block 3. The top surface of the covering layer 401 is flush with the top surface of the bridge deck pavement 2, and the top surface of the combined elastomer is flush with the top surface of the bridge deck concrete layer 201. The covering layer 401 serves as the direct acting layer for the wheel load, protecting the elastic material 303 from wear and extending the service life of the continuous corrugated expansion hidden joint of the bridge deck. The covering layer 401 can be precast. Further, the length of the covering layer 401 in the longitudinal direction of the bridge is greater than the length of the combined elastomer in the longitudinal direction of the bridge, such that both ends of the covering layer 401 in the longitudinal direction cover the bridge deck concrete layer 201, resulting in a better bonding effect between both ends of the covering layer 401 and the asphalt concrete layers 202 on both sides of the expansion joint, which is beneficial to improving the riding comfort.

[0106] The covering layer 401 can be made of wear-resistant materials with deformation capabilities similar to those of the elastic material 303, such as modified asphalt and polyurethane asphalt, which serve as the direct acting layer for the wheel load, protecting the elastic material 303 from wear and extending the service life of the continuous corrugated expansion hidden joint of the bridge deck. After curing, its elastic modulus is equivalent to that of the elastic material 303, ensuring that the two can deform coordinately. Its tensile, compressive, and shear strengths at normal temperature are not less than those of the asphalt concrete layers 202 on both sides, and the bonding strength is ≥1.5 MPa, so as to ensure that no tensile debonding failure occurs at the joint surface between the two, and the durability performance of the covering layer 401 under long-term loads is not inferior to that of the asphalt concrete layers 202. The covering layer 401 can also be made of the same material as the elastic material 303, and is cast together with the elastic material 303, simplifying the installation process on the construction site, reducing the manual workload, shortening the construction period, and saving construction costs.

[0107] Embodiment 4

[0108] This embodiment provides a construction method for a continuous corrugated expansion hidden joint of a bridge deck, which is used for constructing a seamless continuous corrugated expansion hidden joint of a bridge deck described in Embodiment 3, and includes the following steps:

[0109] S1: Reserve an installation notch 11 at the top of one end of the main beam body 101 close to the expansion joint, and fixedly install a toothed plate in the installation notch; when the main beam body 101 is a reinforced concrete structure, pre-embed the toothed plate in the installation notch; when the main beam body 101 is a steel structure, weld the toothed plate in the installation notch;

[0110] S2: Install the precast expansion block 3 into the reserved installation notch 11 at the top of the main beam body 101; the precast expansion block 3 can be prefabricated and assembled in a factory, and then transported to the construction site and installed in the reserved installation notch 11 at the top of the main beam body 101;

[0111] S3: Fix the offset cantilever stiffening steel bars 304 of the precast expansion block 3 through the downward pulling structure in the installation notch 11;

[0112] S4: Pour the bridge deck concrete layer 201 and the asphalt concrete layer 202 of the bridge deck pavement in sequence; among them, when the continuous corrugated telescopic hidden joint of the bridge deck includes the covering layer 401, after pouring the asphalt concrete layer 202, it also includes pouring the covering layer 401 above the precast telescopic block 3 or installing the precast covering layer 401.

[0113] The construction method of the anisotropic seamless bridge deck continuous corrugated telescopic hidden joint in this embodiment can quickly and safely construct the seamless bridge deck continuous corrugated telescopic hidden joint.

[0114] Embodiment 5

[0115] A bridge includes a continuous corrugated telescopic hidden joint of the bridge deck described in Embodiment 3, that is, at least one expansion joint position of the bridge uses a continuous corrugated telescopic hidden joint of the bridge deck to connect two adjacent main beam bodies in the longitudinal bridge direction, so that the road surface above the expansion joint is flush with the top surface of the bridge deck pavement above the main beam body, making driving safer and more comfortable, and adapting to the displacement and deformation of the main beam body.

[0116] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A prefabricated telescopic block, characterized in that, Comprising: A stiffening telescopic plate, the stiffening telescopic plate includes a corrugated steel plate in the middle in the longitudinal bridge direction and end plates arranged at both ends in the longitudinal bridge direction. The corrugated steel plate has vertical corrugations, and the vertical corrugations are continuously arranged in the longitudinal bridge direction. The end plates are used to be anchored to the bridge deck concrete layer of the bridge deck paving above the main beam body and / or the main beam body; An elastic material, the elastic material is arranged above the corrugated steel plate and between the two end plates at both ends. The elastic material and the corrugated steel plate form a combined elastic body through the coupling of the vertical corrugations, and the elastic material is respectively connected to the opposite side surfaces of the two end plates at both ends; Misaligned cantilever stiffening steel bars, the misaligned cantilever stiffening steel bars are used to be arranged on both sides of the expansion joint. The misaligned cantilever stiffening steel bars are arranged in the longitudinal bridge direction, and the misaligned cantilever stiffening steel bars are arranged at equal intervals in the transverse bridge direction. The misaligned cantilever stiffening steel bars on both sides of the expansion joint are arranged staggeredly. One end of the misaligned cantilever stiffening steel bar penetrates into the combined elastic body through the opening of the end plate, and the other end of the misaligned cantilever stiffening steel bar is used to be anchored to the corresponding bridge deck concrete layer and / or the main beam body.

2. The prefabricated expansion block according to claim 1, characterized in that, The staggered spacing of the misaligned cantilever stiffening steel bars on both sides of the expansion joint in the transverse bridge direction is 5 cm - 20 cm; And / or The wave pitch d of the corrugated steel plate is 5 cm - 15 cm, the inclination angle α of the inclined web of the corrugated steel plate is 5° - 15°, and the bending radius R of the wave crest and wave trough of the corrugated steel plate is greater than or equal to 1 cm.

3. A prefabricated telescopic block according to claim 1, characterized in that, The wave crest at the top and the wave trough at the bottom of the corrugated steel plate are thinned areas.

4. A prefabricated telescopic block according to claim 3, characterized in that, The thickness of the corrugated steel plate is 3 mm - 6 mm, the thickness of the thinned area is 0.5 mm - 3 mm, and the vertical height of the thinned area is 2 cm - 3 cm.

5. A prefabricated telescopic block according to claim 1, characterized in that, The two end plates are L-shaped arranged oppositely. The horizontal plates of the L-shaped are located on the upper side of the vertical plates and are arranged oppositely. The upper side horizontal plates of the two end plates are connected to the wave crest at the corresponding end of the corrugated steel plate; Or, the two end plates are L-shaped arranged oppositely. The horizontal plates of the L-shaped are located on the lower side of the vertical plates and are arranged oppositely. The lower side horizontal plates of the two end plates are connected to the wave trough bottom at the corresponding end of the corrugated steel plate.

6. A prefabricated telescopic block according to claim 1, characterized in that, The misaligned cantilever stiffening steel bar is a steel bar member, and a smooth sleeve is sleeved outside the steel bar member. The smooth sleeve penetrates into the combined elastic body through the opening of the end plate.

7. A prefabricated telescopic block according to any one of claims 1-6, characterized in that, A plurality of perforated steel plates are welded on the side of the end plate facing away from the elastic material. The perforated steel plates are arranged in the longitudinal bridge direction. The perforated steel plates welded on each end plate are spaced apart in the transverse bridge direction. The perforated steel plates are used to be buried in the bridge deck concrete layer on the corresponding side of both sides of the expansion joint. Through the shear keys formed by the concrete in the openings of the perforated steel plates, the precast expansion block is anchored and connected to the bridge deck concrete layer.

8. A prefabricated telescopic block according to claim 7, characterized in that, The width of the perforated steel plates in the longitudinal bridge direction is set in at least two types, and the perforated steel plates with different widths in the longitudinal bridge direction are arranged alternately in the transverse bridge direction of the end plate.

9. A continuous corrugated telescopic hidden joint for bridge deck, the continuous corrugated telescopic hidden joint for bridge deck is flush with the top surface of the bridge deck pavement above the main beam bodies on both sides of the expansion joint, and is characterized in that, Comprising: Two adjacent main beam bodies of the bridge. Installation notches are provided oppositely at the ends of the two main beam bodies on both sides of the expansion joint. A toothed plate is fixedly installed at the bottom of each installation notch. The toothed plate is provided with a plurality of teeth in the transverse bridge direction. The teeth of the toothed plate face the direction of the expansion joint and extend beyond the installation notch. The teeth of the toothed plates on both sides of the expansion joint are arranged staggeredly in the transverse bridge direction; Bridge deck pavement, the bridge deck pavement includes a bridge deck concrete layer and an asphalt concrete layer. The bridge deck concrete layer is laid on the upper surface of the main girder body and covers the installation notch, and the asphalt concrete layer is laid above the bridge deck concrete layer; The precast expansion block as described in any one of claims 1-8 is arranged in the installation notches on both sides of the expansion joint of two main girder bodies; the end plate and the staggered cantilever stiffening steel bars of the precast expansion block are both anchored in the corresponding side of the bridge deck concrete layer on both sides of the expansion joint and / or the part of the main girder body located in the installation notch at one end of the main girder body close to the expansion joint.

10. A continuous corrugated expansion hidden joint for bridge deck according to claim 9, characterized in that The wave height D of the corrugated steel plate is 1 cm - 2 cm smaller than the height of the bridge deck concrete layer in the installation notch; And / or A covering layer is provided on the top of the precast expansion block, and the top surface of the covering layer is flush with the top surface of the bridge deck pavement.

11. A prefabrication method of a prefabricated expansion block, characterized in that, For precasting the precast expansion block described in claim 1, the precasting method includes the following steps: ① Roll the corrugated steel plate and the end plate according to the design dimensions to form a stiffening expansion plate, thin the wave crest and wave trough areas of the corrugated steel plate, and drill holes in both the end plate and the corrugated steel plate and insert the staggered cantilever stiffening steel bars; ② Place the corrugated steel plate with the staggered cantilever stiffening steel bars inserted upright, pour the elastic material above the corrugated steel plate, and let it stand until it solidifies and forms, and the precast expansion block is precast; Wherein, when the end plate is provided with a perforated steel plate, it also includes welding the perforated steel plates on the end plates at both ends of the corrugated steel plate.

12. A construction method for a continuous corrugated telescopic hidden joint of a bridge deck, characterized in that, For constructing a continuous corrugated expansion hidden joint for bridge deck as described in any one of claims 9-10, it includes the following steps: S1: Reserve an installation notch at the top of one end of the main girder body close to the expansion joint, and fixedly install a toothed plate in the installation notch; S2: Install the precast expansion block in the reserved installation notch at the top of the main girder body; S3: Fix the staggered cantilever stiffening steel bars of the precast expansion block through the downward pulling structure in the installation notch; S4: Pour the bridge deck concrete layer and the asphalt concrete layer of the bridge deck pavement in sequence; wherein, when the continuous corrugated expansion hidden joint for bridge deck includes a covering layer, after pouring the asphalt concrete layer, it also includes constructing the covering layer above the precast expansion block.

13. A bridge, characterized in that, Including a continuous corrugated expansion hidden joint for bridge deck as described in any one of claims 9-10.

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