Special-shaped steel-elastomer combined seamless expansion joint structure and bridge

Abstract

The utility model relates to the technical field of expansion joints, in particular to a deformed steel-elastic body combined seamless expansion joint structure and a bridge, the expansion joint structure increases the coupling action area and the coupling force of an elastic body and deformed steel through the combined structural design of a deformed plate, the deformed steel, the elastic body and a covering layer, so that the expansion joint structure is more flexible and reliable. The phenomenon that weak connecting surfaces are easy to debond too early is improved, the service life of the structure is prolonged, and the durability of the structure is improved; the deformation direction of the elastic body is controllable, the road surface is prevented from bulging, and the driving safety problems such as bumping are completely eradicated; the covering layer in the expansion joint area can cooperate with the elastic material for tension and compression deformation, meanwhile, it is guaranteed that the rigidity transition from the asphalt concrete layer in the non-expansion area to the covering layer is smooth, and the vicious circle that the bumping phenomenon is caused by the unsmooth road surface, and the local damage of the road surface is more serious due to the impact load under the bumping phenomenon is prevented.

Description

Technical Field

[0001] This utility model relates to the field of expansion joint technology, and in particular to a seamless expansion joint structure and bridge made of irregular steel-elastomer combination. Background Technology

[0002] Expansion joints are a common auxiliary structure in bridge engineering. They are usually set at the bridge deck connection between two bridges or between the bridge end and the abutment. They are used to compensate for the deformation of the bridge structure caused by temperature loads and live loads under normal conditions, as well as earthquake loads, impact loads, settlement displacements, etc. under sudden conditions, to release the internal forces of the main bridge structure and avoid structural damage.

[0003] The bridge beam expands and contracts due to daily and annual temperature differences, causing expansion joints to be compressed and stretched. Under live loads, the beam ends rotate upwards, resulting in bending deformation of the expansion joints. Therefore, the expansion joints need to possess longitudinal and angular stiffness matching the structure to accommodate deformation, and their construction must meet fatigue resistance requirements for repeated expansion and bending deformations. As a connecting structure of the bridge deck, expansion joints need to have a certain vertical stiffness to ensure bridge deck continuity and driving comfort. Under traffic flow, expansion joints are repeatedly subjected to vehicle impact loads, and their surfaces and weak structural connections are prone to damage, requiring high durability. In addition, expansion joints should also consider many other functions such as dust prevention, seepage prevention, vibration reduction and noise reduction, and ease of construction and replacement.

[0004] After years of engineering application, it has been found that traditional comb-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 section protrudes upward, causing vehicles to bounce when passing through, which seriously affects driving comfort; (2) The gap between the steel section on the top surface of the expansion joint cannot prevent rain, snow and dust, resulting in water accumulation and dirt accumulation and blockage, affecting the deformation capacity of the expansion joint; (3) The stiffness transition from the bridge deck to the expansion joint is not smooth, which leads to increased impact of vehicle load and serious wear and cracking of the concrete on the connection surface with the steel section.

[0005] To address the aforementioned issues, Chinese utility model patent CN102660922B proposes a seamless bridge deck expansion joint structure. It discloses a technical solution involving placing a pad within a pre-reserved groove to form a closed gap, pouring an elasto-plastic material within it, and finally paving an asphalt concrete layer through the top surface. This solution achieves a seamless expansion joint design, but it presents the following technical challenges in engineering applications:

[0006] (1) The pad in the scheme is a steel plate, whose elastic modulus is several orders of magnitude greater than that of the elasto-plastic body of the joint filler. During the stretching and compression deformation of the expansion joint, the pad and the elasto-plastic body cannot deform in coordination. The connection surface of the two debonds due to the shear stress generated by the relative deformation, resulting in structural damage.

[0007] (2) The connection surface between the elasto-plastic body and the concrete pavement layer in the scheme is the weak surface of the structure. Its surface bond strength is less than the tensile strength of the elasto-plastic body and the concrete pavement layer, and it is easy to be damaged first during tensile and compressive deformation. Utility Model Content

[0008] The purpose of this utility model is to address the problem that in the existing seamless bridge deck expansion joint structure, the pad placed in the reserved groove is a steel plate, whose elastic modulus is several orders of magnitude higher than that of the elasto-plastic body used for filling the joint. During the tensile and compressive deformation of the expansion joint, the pad and the elasto-plastic body cannot deform in coordination, and the connection surface between the two debonds due to the shear stress generated by the relative deformation, resulting in structural damage. The connection surface between the elasto-plastic body and the concrete pavement layer is a weak surface of the structure, and its surface bond strength is less than the tensile strength of the elasto-plastic body and the concrete pavement layer, making it the first to be damaged during tensile and compressive deformation. The present invention provides a non-standard steel-elasto-plastic composite seamless expansion joint structure and bridge.

[0009] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0010] In a first aspect, this utility model provides a seamless expansion joint structure combining shaped steel and an elastomer, including an expansion device and an anchoring device. The expansion device includes a deformable plate, shaped steel, an elastomer, and a covering layer. Two shaped steels are arranged opposite each other, with the top distance between the two shaped steels being less than the bottom distance, and the bottom distance being the expansion joint distance. The two sides of the deformable plate are respectively fixed to the bottom of the shaped steel. The space between the deformable plate and the shaped steel is filled with an elastomer. The shaped steel has a toothed groove, and the two sides of the elastomer are embedded in the toothed groove. The top of the elastomer is flush with the top of the shaped steel. The covering layer is disposed on top of the elastomer and the shaped steel, and the width of the covering layer is greater than the sum of the widths of the elastomer and the two shaped steels. The anchoring device is used to anchor the shaped steel to a reserved groove at the end of the main beam. The stiffness of the deformable plate is less than the stiffness of the shaped steel, and the elastomer and the covering layer can deform in coordination. The material of the covering layer includes asphalt.

[0011] By setting the deformation plate, which has low stiffness and strong deformation capacity, it can be used as the bottom formwork for casting the elastomer during the construction stage, and as a protective layer for the elastomer during the later operation stage. It isolates the bottom surface of the elastomer from air, rainwater, etc., slows down the aging process of the elastomer over time, and does not restrict the deformation of the elastomer, giving the elastomer enough space to deform downward.

[0012] By setting the grooves on the shaped steel, the contact area and interlocking force between the elastomer and the shaped steel can be increased, enhancing the surface coupling effect between them and preventing the elastomer from detaching prematurely under deformation. The distance between the tops of the two shaped steels is smaller than the distance between the bottoms, so that the amount of downward deformation of the elastomer during compression deformation is greater than the amount of upward deformation, ensuring the smoothness of the top surface of the expansion joint.

[0013] By setting the covering layer, its deformation capacity is similar to that of the elastomer. After the covering layer is cured, its elastic modulus is comparable to that of the elastomer, ensuring that the two can deform in coordination. The covering layer protects the elastomer from wear and improves the service life of the expansion joint structure. The material of the covering layer includes asphalt, which is similar in properties to the asphalt concrete layer used in the road surface, making the stiffness transition of the road surface from the non-expansion joint area to the expansion joint area smooth.

[0014] The present invention employs a seamless expansion joint structure combining shaped steel and an elastomer. Through the combined structural design of the deformable plate, the shaped steel, the elastomer, and the covering layer, the coupling area and coupling force between the elastomer and the shaped steel are increased, improving the phenomenon of premature debonding at weak connection surfaces, extending the structural life and improving structural durability. The deformation direction of the elastomer is controllable, preventing road surface bulging and eliminating traffic safety issues such as vehicle bounce. The covering layer in the expansion joint area can cooperate with the elastic material in tensile and compressive deformation, while ensuring a smooth transition in stiffness from the asphalt concrete layer to the covering layer in the non-expansion area, preventing a vicious cycle of "vehicle bounce due to road surface unevenness, and the impact load under the bounce causing more severe local road damage."

[0015] As a preferred technical solution of this utility model, the deformable plate within the expansion joint spacing range is configured to protrude downwards.

[0016] As a preferred technical solution of this utility model, the deformable plate is made of thin aluminum plate or membrane cloth.

[0017] As a further preferred technical solution of this utility model, the thickness of the thin aluminum plate is 0.1~0.5mm.

[0018] As a preferred technical solution of this utility model, the elastomer is a polyurethane, polyurea, or rubber.

[0019] As a preferred technical solution of this utility model, for type 80 expansion joints, the Shore hardness of the elastomer is 20~50A and the tensile modulus is ≤0.6MPa; for type 160 expansion joints, the Shore hardness of the elastomer is 20~30A and the tensile modulus is ≤0.5MPa.

[0020] As a preferred technical solution of this utility model, the covering layer is a modified asphalt layer or a polyurethane asphalt layer.

[0021] As a preferred technical solution of this utility model, the anchoring device includes bent steel bars and straight steel bars; a number of bent steel bars are arranged at intervals along the transverse direction of the bridge and connected together by the straight steel bars to form a steel cage; the steel cage is welded to the special-shaped steel and set in the reserved slot.

[0022] Secondly, this utility model also provides a construction method for the irregular steel-elastomer combined seamless expansion joint structure as described in any of the above claims, comprising the following steps:

[0023] S1. A pre-reserved groove is set at the top of the end of the main beam where an expansion joint needs to be installed; the special-shaped steel and the anchoring device are prefabricated, and the special-shaped steel and the anchoring device are welded together to form a prefabricated component;

[0024] S2. Place the deformable plate and the prefabricated component at the reserved slot, and fix the deformable plate to the bottom of the special-shaped steel.

[0025] S3. Using the deformable plate as the bottom mold and the special-shaped steel as the side mold, the elastic body is cast, and the elastic body fills the area between the deformable plate and the special-shaped steel and is embedded in the groove of the special-shaped steel.

[0026] S4. After the elastomer has solidified, pour the concrete at the reserved groove, the bridge deck concrete layer, the asphalt concrete layer and the cover layer in sequence.

[0027] The concrete at the reserved slot connects the anchoring device to the main beam body as a whole;

[0028] The bridge deck concrete layer is laid on the main beam body and connected to the special-shaped steel;

[0029] The asphalt concrete layer is set on the bridge deck concrete layer, and a post-cast strip is provided. The bottom surface of the post-cast strip is, in sequence, the bridge deck concrete layer, the special-shaped steel, the elastic body, the special-shaped steel, and the bridge deck concrete layer.

[0030] The covering layer is disposed in the post-pouring strip.

[0031] The construction method of the seamless expansion joint structure of the irregular steel-elastomer combination described in this utility model can be quickly constructed by combining the combination structure design of the deformable plate, the irregular steel, the elastomer and the covering layer in the factory with on-site casting.

[0032] Thirdly, this utility model also provides a bridge, including an expansion joint, wherein the expansion joint adopts a seamless expansion joint structure of irregular steel-elastomer combination as described in any of the above.

[0033] As a preferred technical solution of this utility model, the bridge further includes a main beam body, a bridge deck concrete layer, and an asphalt concrete layer; the end of the main beam body is provided with a reserved slot, and the anchoring device is set in the reserved slot and connected by concrete pouring; the bridge deck concrete layer is set on the main beam body, and the bridge deck concrete layer is connected to the special-shaped steel; the asphalt concrete layer is set on the bridge deck concrete layer, and the asphalt concrete layer is connected to the overlay layer.

[0034] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0035] 1. The seamless expansion joint structure of the irregular steel-elastic composite described in this utility model, through the combined structural design of the deformable plate, the irregular steel, the elastic body, and the covering layer, increases the coupling area and coupling force between the elastic body and the irregular steel, improves the phenomenon of premature debonding at weak connection surfaces, extends the structural life, and improves the structural durability; makes the deformation direction of the elastic body controllable, prevents road surface bulging, and eliminates traffic safety problems such as vehicle bounce; allows the covering layer in the expansion joint area to cooperate with the elastic material in tensile and compressive deformation, while ensuring a smooth transition of stiffness from the asphalt concrete layer to the covering layer in the non-expansion area, preventing the vicious cycle of "vehicle bounce caused by uneven road surface, and the impact load under the bounce causing more serious local road damage";

[0036] 2. The construction method of the seamless expansion joint structure of the irregular steel-elastomer combination described in this utility model can be quickly constructed by combining the combination structure design of the deformable plate, the irregular steel, the elastomer and the covering layer in the factory with on-site casting. Attached Figure Description

[0037] Figure 1 A schematic cross-sectional view of a seamless expansion joint structure composed of irregular steel and elastomer;

[0038] Figure 2 A schematic cross-sectional view of a seamless expansion joint structure composed of irregular steel and elastomer;

[0039] Figure 3 A three-dimensional structural diagram of a seamless expansion joint structure composed of irregular steel and elastomer;

[0040] Figure 4 A schematic diagram showing the connection between the expansion joint and the anchoring device;

[0041] Figure 5 This is a schematic diagram of the structure of irregular-shaped steel.

[0042] Markings in the diagram: 1-Main beam body, 2-Bridge deck concrete layer, 3-Asphalt concrete layer, 4-Covering layer, 5-Deformable plate, 6-Special-shaped steel, 7-Elastomer, 8-Hooked steel bar, 9-Straight steel bar, 10-Reserved slot. Detailed Implementation

[0043] The present invention will be further described in detail below with reference to experimental examples and 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. All technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0044] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of this utility model is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.

[0045] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0046] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0047] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0048] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "equipped with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0049] In related technologies, there is an existing seamless bridge deck expansion joint structure where the pad placed in the reserved slot is a steel plate. Its elastic modulus is several orders of magnitude higher than that of the elasto-plastic filler. During the tensile and compressive deformation of the expansion joint, the pad and the elasto-plastic filler cannot deform in coordination. The interface between the two debonds due to shear stress generated by relative deformation, leading to structural damage. The interface between the elasto-plastic filler and the concrete pavement layer is a weak point in the structure, with surface bond strength lower than the tensile strength of the elasto-plastic filler and the concrete pavement layer, making it prone to failure during tensile and compressive deformation. Therefore, the technical solution of this application was developed. The following is a detailed explanation... Figures 1 to 5 To elaborate.

[0050] Example 1

[0051] like Figures 1 to 5 As shown, the present invention discloses a seamless expansion joint structure combining shaped steel and elastomer, comprising an expansion device and an anchoring device.

[0052] like Figure 1 As shown, the telescopic device includes a deformable plate 5, a special-shaped steel 6, an elastic body 7, and a covering layer 4. The two special-shaped steels 6 are arranged opposite each other, and the top distance between the two special-shaped steels 6 is slightly smaller than the bottom distance, and the bottom distance is the expansion joint distance. The two sides of the deformable plate 5 are respectively fixed to the bottom of the special-shaped steel 6.

[0053] like Figure 1 , Figure 3 and Figure 4 As shown, the deformable plate 5 within the expansion joint spacing range is configured to protrude downwards, and the space between the deformable plate 5 and the shaped steel 6 is filled with an elastic body 7. The shaped steel 6 is provided with a toothed groove, and the two sides of the elastic body 7 are embedded in the toothed groove. The top of the elastic body 7 is flush with the top of the shaped steel 6.

[0054] In some optional embodiments, the deformable plate 5 can be made of thin aluminum plate or polyethylene film with a thickness of 0.1~0.5mm, which is a deformable thin plate or film material with a stiffness much lower than that of the special-shaped steel 6. The deformable plate 5 with low stiffness and strong deformation capacity can be used as the bottom formwork for casting the elastomer 7 during the construction stage, and can also be used as a protective layer for the elastomer 7 during the later operation stage, isolating the bottom surface of the elastomer 7 from air, rainwater, etc., slowing down the aging process of the elastomer 7 over time, without restricting the deformation of the elastomer 7, and giving the elastomer 7 sufficient downward deformation release space.

[0055] In some optional embodiments, the shaped steel 6 can be selected from the shaped steel recommended in Clause 5.3.1 of "Highway Bridge Expansion Joint (JT / T 327-2004)". The mating surface between the shaped steel 6 and the elastic body 7 is irregularly toothed, which can increase the contact area and interlocking force between the elastic body 7 and the shaped steel 6, enhance the surface coupling effect between them, and prevent the elastic body 7 from prematurely detaching under deformation. The top distance between the two shaped steel 6 is smaller than the bottom distance, so that the downward deformation of the elastic body 7 during compression deformation is greater than the upward deformation, ensuring the smoothness of the top surface of the expansion joint. In this embodiment, as shown... Figure 5 As shown, the height H of the special-shaped steel 6 is ≥50mm, the minimum width B at the toothed part is ≥11mm, the minimum thickness t1 at the top is ≥10mm, the minimum thickness t2 at the bottom is ≥10mm, the width B1 at the top is ≥40mm, and the width B2 at the bottom is ≥50mm.

[0056] In some optional embodiments, the elastomer 7 is made of elastic materials such as polyurethane, polyurea, or rubber, which have low stiffness, high elasticity, and good adhesion to concrete and steel. For type 80 expansion joints, the Shore hardness of the elastomer 7 is 20~50A, and the tensile modulus of elasticity is ≤0.6MPa; for type 160 expansion joints, the Shore hardness of the elastomer 7 is 20~30A, and the tensile modulus of elasticity is ≤0.5MPa, ensuring that the stiffness of the formed combined elastomer is sufficiently low to meet the deformation requirements under design loads. The tensile strength of the elastomer 7 is ≥3.0MPa, the bond strength is ≥1.5MPa, and the elongation at break is ≥900%, ensuring that under the ultimate deformation, the expansion joint structure will not experience debonding failure at the interface between the elastomer 7 and the steel / concrete, and that the elastomer 7 will not crack due to internal forces exceeding its tensile strength.

[0057] like Figure 1 and Figure 3 As shown, the covering layer 4 is disposed on top of the elastic body 7 and the shaped steel 6, and the width of the covering layer 4 is greater than the sum of the widths of the elastic body 7 and the two shaped steels 6.

[0058] In some optional embodiments, the cover layer 4 is made of a wear-resistant material with a deformation capacity similar to that of the elastomer 7, such as modified asphalt or polyurethane asphalt. As a layer directly interacting with wheel loads, the cover layer 4 protects the elastomer 7 from wear and improves the service life of the expansion joint structure. After curing, the elastic modulus of the cover layer 4 is comparable to that of the elastomer 7, ensuring coordinated deformation between the two. The material of the cover layer 4 includes asphalt, similar in properties to the asphalt concrete layer 3 used in the road surface, resulting in a smooth transition in stiffness from the non-expansion joint area to the expansion joint area. The tensile, compressive, and shear strengths of the cover layer 4 at room temperature are not less than the strengths of the asphalt concrete layers 3 on both sides, and the bond strength is ≥1.5 MPa, ensuring that the interface between the two does not experience tensile debonding failure, and that the durability of the cover layer 4 under long-term load is not inferior to that of the asphalt concrete layer 3. The interface between the cover layer 4 and the asphalt concrete layer 3 is offset by 10-20cm from the connection surface between the special-shaped steel 6 and the bridge deck concrete layer 2 towards the two main beam bodies 1. This avoids the interface being in the same cross section as the connection surface between the special-shaped steel 6 and the bridge deck concrete layer 2, which would cause this cross section to become a weak section under vehicle load due to sudden stiffness changes and complex connections, thus affecting the durability of the expansion joint.

[0059] like Figure 1 , Figure 2 and Figure 4 As shown, the anchoring device is used to anchor the shaped steel 6 to the reserved slot 10 at the end of the main beam 1. The anchoring device is partially embedded in the main beam 1 and partially embedded in the bridge deck concrete layer 2. The specific structural form of the anchoring device can be selected in various ways. In this embodiment, the anchoring device includes hooked steel bars 8 and straight steel bars 9; several hooked steel bars 8 are spaced apart along the transverse direction of the bridge and connected together by the straight steel bars 9 to form a steel cage; the steel cage is welded to the shaped steel 6 and placed in the reserved slot 10. Specifically, the hooked steel bars 8 are U-shaped, with one end welded to the tail of the shaped steel 6 and the other end extending into the bridge deck concrete layer 2 and the main beam 1, forming an anchor through the connection area between the steel bar and the concrete and the enclosed concrete shear tenon.

[0060] In some optional embodiments, the hook reinforcement 8 may be, but is not limited to, HRB400 reinforcement with a diameter d1 = 8~20mm, a longitudinal anchorage length ≥10d1, and a vertical anchorage depth ≥8d1, and the vertical anchorage should extend into the area of ​​the main beam body 1. The hook reinforcement 8 is evenly distributed along the transverse direction of the bridge, with a spacing of 10~25cm. The spacing should not be too small to ensure the concrete pouring is dense, and the spacing should not be too large to ensure reliable anchorage connection.

[0061] In some optional embodiments, the straight steel bar 9 may be, but is not limited to, HRB400 steel bar with a diameter d1 = 8~20mm. The length direction of the straight steel bar 9 is arranged along the transverse direction of the bridge and is spot-welded to the hook steel bar 8 to form a steel cage, so that multiple hook steel bars 8 can share the force and strengthen the anchorage of the expansion joint to the main beam 1 and the bridge deck concrete layer 2.

[0062] This embodiment describes a seamless expansion joint structure combining shaped steel and an elastomer. Through the combined structural design of the deformable plate 5, the shaped steel 6, the elastomer 7, and the covering layer 4, the coupling area and coupling force between the elastomer 7 and the shaped steel 6 are increased. This improves the phenomenon of premature debonding at weak connection surfaces, extends the structural life, and enhances structural durability. The deformation direction of the elastomer 7 is controllable, preventing road surface bulging and eliminating traffic safety issues such as vehicle bounce. The covering layer 4 in the expansion joint area can cooperate with the elastic material 7 in tensile and compressive deformation, while ensuring a smooth transition in stiffness from the asphalt concrete layer 3 to the covering layer 4 in the non-expansion area, preventing a vicious cycle of "vehicle bounce due to uneven road surface, and further localized road damage caused by the impact load under the bounce."

[0063] Example 2

[0064] like Figures 1 to 5 As shown, the construction method of the seamless expansion joint structure of irregular steel-elastomer combination as described in Example 1 of this utility model includes the following steps:

[0065] S1, such as Figure 1 As shown, a pre-reserved groove 10 is provided at the top of the end of the main beam 1 where the expansion joint needs to be installed; as Figure 4 and Figure 5 As shown, the special-shaped steel 6 and the anchoring device are prefabricated, and the special-shaped steel 6 and the anchoring device are welded together to form a prefabricated component.

[0066] S2, such as Figure 1 and Figure 3 As shown, the deformable plate 5 and the prefabricated component are placed at the reserved slot 10, and the deformable plate 5 is fixed to the bottom of the shaped steel 6.

[0067] S3, such as Figure 1 , Figure 3 and Figure 4 As shown, the elastic body 7 is cast using the deformable plate 5 as the bottom mold and the special-shaped steel 6 as the side mold. The elastic body 7 fills the area between the deformable plate 5 and the special-shaped steel 6 and is embedded in the groove of the special-shaped steel 6.

[0068] S4, such as Figure 1 and Figure 3As shown, after the elastomer 7 solidifies, concrete at the reserved slots 10, bridge deck concrete layer 2, asphalt concrete layer 3 and the covering layer 4 are poured in sequence, and cured to the specified age according to the specifications.

[0069] like Figure 1 As shown, the concrete at the reserved slot 10 connects the anchoring device to the main beam 1 as a whole, and the anchoring device protrudes from the top of the main beam 1.

[0070] like Figure 1 and Figure 3 As shown, the bridge deck concrete layer 2 is laid on the main beam body 1 and connected to the special-shaped steel 6, as... Figure 1 and Figure 2 As shown, the protruding part of the anchoring device is embedded in the bridge deck concrete layer 2.

[0071] like Figure 1 and Figure 3 As shown, the asphalt concrete layer 3 is set on the bridge deck concrete layer 2, and a post-cast strip is provided. The bottom surface of the post-cast strip consists of the bridge deck concrete layer 2, the special-shaped steel 6, the elastic body 7, the special-shaped steel 6, and the bridge deck concrete layer 2 in sequence.

[0072] like Figure 1 and Figure 3 As shown, the covering layer 4 is disposed in the post-pouring strip.

[0073] The construction method of the seamless expansion joint structure of the irregular steel-elastomer combination described in this embodiment, through the combined structural design of the deformable plate 5, the irregular steel 6, the elastomer 7 and the covering layer 4, can be quickly constructed by factory prefabrication combined with on-site casting.

[0074] Example 3

[0075] The bridge described in this utility model includes an expansion joint, a main beam body 1, a bridge deck concrete layer 2, and an asphalt concrete layer 3.

[0076] The expansion joint adopts the seamless expansion joint structure of irregular steel-elastomer combination as described in Example 1.

[0077] The end of the main beam 1 is provided with a reserved slot 10, and the anchoring device is set in the reserved slot 10 and connected by concrete pouring.

[0078] The bridge deck concrete layer 2 is disposed on the main beam body 1, and the bridge deck concrete layer 2 is connected to the special-shaped steel 6.

[0079] The asphalt concrete layer 3 is disposed on the bridge deck concrete layer 2, and the asphalt concrete layer 3 is connected to the overlay layer 4.

[0080] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A seamless expansion joint structure combining irregularly shaped steel and an elastomer, characterized in that, include: The telescopic device includes a deformable plate (5), a shaped steel (6), an elastomer (7), and a covering layer (4). The two shaped steels (6) are arranged opposite each other. The top distance between the two shaped steels (6) is smaller than the bottom distance, and the bottom distance is the expansion joint distance. The two sides of the deformable plate (5) are respectively fixed to the bottom of the shaped steel (6). The space between the deformable plate (5) and the shaped steel (6) is filled with an elastomer (7). The shaped steel (6) is provided with a toothed groove. The two sides of the elastomer (7) are embedded in the toothed groove. The top of the elastomer (7) is flush with the top of the shaped steel (6). The covering layer (4) is provided on top of the elastomer (7) and the shaped steel (6). The width of the covering layer (4) is greater than the sum of the widths of the elastomer (7) and the two shaped steels (6). An anchoring device for anchoring the special-shaped steel (6) into the reserved slot (10) at the end of the main beam body (1); The stiffness of the deformable plate (5) is less than that of the shaped steel (6), the elastic body (7) and the covering layer (4) can deform in coordination, and the material of the covering layer (4) includes asphalt.

2. The seamless expansion joint structure of irregular steel-elastomer combination according to claim 1, characterized in that, The deformable plate (5) within the expansion joint spacing range is configured to protrude downwards.

3. The seamless expansion joint structure of irregular steel-elastomer combination according to claim 1, characterized in that, The deformable plate (5) is made of thin aluminum plate or membrane cloth.

4. The seamless expansion joint structure of irregular steel-elastomer combination according to claim 3, characterized in that, The thickness of the thin aluminum plate is 0.1~0.5mm.

5. The seamless expansion joint structure of irregular steel-elastomer combination according to claim 1, characterized in that, The elastomer (7) is a polyurethane, polyurea, or rubber.

6. The seamless expansion joint structure of irregular steel-elastomer combination according to claim 1, characterized in that, For type 80 expansion joints, the Shore hardness of the elastomer (7) is 20~50A, and the tensile modulus is ≤0.6MPa; For a 160-type expansion joint, the Shore hardness of the elastomer (7) is 20~30A and the tensile modulus is ≤0.5MPa.

7. The seamless expansion joint structure of irregular steel-elastomer combination according to claim 1, characterized in that, The covering layer (4) is a modified asphalt layer or a polyurethane asphalt layer.

8. The seamless expansion joint structure of irregular steel-elastomer combination according to any one of claims 1-7, characterized in that, The anchoring device includes a hook steel bar (8) and a straight steel bar (9); Several bent steel bars (8) are arranged at intervals along the transverse direction of the bridge and connected together by the straight steel bars (9) to form a steel cage; The steel cage is welded to the special-shaped steel (6) and set in the reserved slot (10).

9. A bridge, comprising an expansion joint, characterized in that, The expansion joint adopts the seamless expansion joint structure of irregular steel-elastomer combination as described in any one of claims 1-8.

10. The bridge according to claim 9, characterized in that, Also includes: The main beam body (1) has a reserved slot (10) at its end, and the anchoring device is set in the reserved slot (10) and connected by concrete pouring; A bridge deck concrete layer (2) is provided on the main beam body (1), and the bridge deck concrete layer (2) is connected to the special-shaped steel (6); An asphalt concrete layer (3) is provided on the bridge deck concrete layer (2), and the asphalt concrete layer (3) is connected to the overlay layer (4).

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