A seamless expansion joint structure and construction method based on spring ribs

Abstract

The present invention relates to a seamless expansion joint structure based on spring bars, including a pair of bridge bodies with opposite ends. The bridge body is composed of a main beam, a bridge deck laid on top of the main beam, and a bridge deck pavement laid on top of the bridge deck. An unbonded layer is provided at the top of the end of the main beam, and a concave-convex UHPC plate for connecting the bridge deck is arranged between the tops of the unbonded layers. The filler paving layer is arranged from the plate groove of the UHPC plate to the surface layer, and a spring connection section is arranged for the steel bars in the plate groove of the UHPC plate. It effectively improves the stiffness at the continuous part of the bridge deck, enhances the overall vertical stiffness and strength of the connection structure, makes it match the vertical stiffness of the bridge deck, and can significantly reduce diseases such as edge gnawing of the reserved groove and cracking of the elastomer caused by a large deformation difference when the wheel rolls over the expansion joint. It better adapts to the complex spatial stress state of the bridge deck and meets the normal use requirements of the continuous structure of the bridge deck.

Description

Technical Field

[0001] The present invention relates to a seamless expansion joint structure and construction method based on spring bars. Background Art

[0002] In traditional jointed bridges, in order to absorb the expansion and contraction deformation of the main girder caused by temperature changes, expansion joints are usually provided at both ends, and an expansion joint structure is usually provided at this expansion joint. The expansion joint directly bears the actions of vehicle loads, the environment, etc., and is extremely prone to diseases and even failures. When the expansion joint is damaged, it is often accompanied by cracking, chipping, and edge damage of the concrete pavement connected to it. Over time, uneven settlement and pavement heaving occur in this part of the pavement, greatly reducing the service quality of the bridge and affecting the safety and durability of the bridge structure.

[0003] Traditionally, to solve the problem of easy damage to bridge expansion joints, existing technologies mostly adopt the bridge deck connection plate structure in the continuous bridge deck structure or set a seamless elastoplastic expansion joint. However, due to its special position, the bridge deck connection plate is under complex stress all year round and cannot adapt to deformation and is damaged more severely. And for the elastoplastic expansion joint, because it uses an elastoplastic body and cannot provide a high vertical bearing capacity, through cracks often occur, which affects the overall service life of the bridge again. Therefore, in order to adapt to the expansion and contraction deformation amount here, a seamless expansion joint structure that can adapt to horizontal deformation and has a high vertical bearing capacity is proposed, providing a reference value for the replacement and use of expansion devices and expansion joints for small and medium-sized bridges. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a seamless expansion joint structure and construction method based on spring bars.

[0005] To solve the above technical problems, the technical solution of the present invention is: a seamless expansion joint structure based on spring bars, including a pair of bridge bodies with opposite ends. The bridge body is composed of a main girder, a bridge deck laid on the top of the main girder, and a bridge deck pavement laid on the top of the bridge deck. An unbonded layer is provided at the top of the end of the main girder, and a concave-convex UHPC plate for connecting the bridge deck is provided between the tops of the unbonded layers. The filler paving layer is provided from the plate groove of the UHPC plate to the surface layer, and a spring connection section is provided with steel bars in the plate groove of the UHPC plate.

[0006] Preferably, the UHPC plate is a cast-in-situ plate on site. The UHPC plate presents a concave-convex shape with large tooth openings. The concave part is the corresponding deformation adaptation area, and the convex part is the corresponding bearing area. The UHPC plate is tied with steel bars to both the bridge deck and the main girder.

[0007] Preferably, a spring connection section is provided for the steel bars in the deformation area of the UHPC slab. The spring connection section is formed by curling thin-diameter steel bars and welded to the steel bars at both ends. The middle gap of the spring connection section is filled with sponge foam, and the outside of the spring connection section is wrapped with a PVC pipe layer to isolate the aggregate.

[0008] Preferably, the filler paving layer is a polyurethane gravel mixture paving layer.

[0009] Preferably, the filler paving layer is connected to the bridge deck paving and the upper surfaces are flush.

[0010] A construction method for a seamless expansion joint structure based on spring bars is carried out according to the following steps:

[0011] (1) In the factory, according to the drawing dimensions and on-site requirements, the steel bars of the spring connection section required in the UHPC slab are prefabricated as a whole, and anti-corrosion and rust-proof treatments are carried out.

[0012] (2) Before erecting the main girder, the construction process is carried out normally according to the conventional steps. After the main girder is placed, foam sponge sealant is added.

[0013] (3) Then, a non-bonding layer is placed at the corresponding position between the main girders. The non-bonding layer is rubber.

[0014] (4) While laying the bridge deck steel bars, longitudinal and transverse steel bars are tied at the corresponding position of this expansion joint. The steel bars of the spring connection section required in the UHPC slab are tied to the bridge deck steel bars and the steel bars extended from the main girders. Subsequently, the formwork erection of the UHPC slab structure is carried out.

[0015] (5) Start the post-cast work, pour the bridge deck concrete and the UHPC slab. After pouring, carry out normal steam curing until the concrete is basically fixed and formed.

[0016] (6) Finally, carry out the paving of the ordinary asphalt layer of the bridge deck paving and the paving of the polyurethane gravel mixture paving layer at the expansion joint, and make their upper surfaces flush and compacted. Subsequently, carry out maintenance, and the traffic can be opened after 3 - 5 hours.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] ①. Effectively improves the stiffness at the bridge deck connection, enhances the overall vertical stiffness and strength of the connection structure, makes its vertical stiffness match that of the bridge deck, and can significantly reduce diseases such as edge gnawing of the reserved groove and cracking of the elastomer caused by large deformation differences when the wheels roll over the expansion joint. It better adapts to the complex spatial stress state of the bridge deck and meets the normal use requirements of the bridge deck continuous structure.

[0019] ② It has good deformation performance. By utilizing the better telescopic deformation amount of the spring connection section and the good elastoplasticity and ductility of the polyurethane gravel mixture, it realizes good deformation ability in the longitudinal direction of the bridge to adapt to the telescopic deformation of the beam body due to shrinkage, creep and temperature changes. It also has a certain stiffness to effectively resist the horizontal displacement of the upper structure of the bridge under the action of braking force, and can also reduce the deviation of the pier, which is beneficial to the force of the pier.

[0020] ③ It has convenient construction performance. The structure of this bridge deck connection is simple and there is no complex steel bar connection structure. The special steel bar section is prefabricated in the factory for mass production, which is suitable for the construction of new bridges. It cancels the cumbersome process of chiseling and installing the expansion joint, and the installation and equipment process is completed in one go. It effectively prevents the damage to the solidification process of UHPC caused by the disturbance of passing vehicles, and construction can be carried out without completely closing the traffic during local reinforcement.

[0021] The following further elaborates on the present invention in conjunction with the drawings and specific embodiments. Description of the Drawings

[0022] Figure 1 It is a schematic elevation view of the structure of the present invention;

[0023] Figure 2 is Figure 1 a top view of the A-A section of

[0024] Figure 3 It is a partial detailed structure diagram of the spring connection section.

[0025] In the figure: 1 - filler paving layer; 2 - UHPC plate; 3 - bridge deck; 4 - unbonded layer; 5 - main beam; 6 - lap joint of main beam steel bars and bridge deck steel bars; 7 - lap joint of main beam steel bars and steel bars in the UHPC plate; 8 - spring connection section; 9 - ordinary steel bars in the UHPC plate; 10 - steel bars in the main beam; 11 - pvc pipe layer; 12 - steel bars. Specific Embodiments

[0026] The following further describes the present invention in conjunction with the drawings and embodiments.

[0027] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0028] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0029] As Figures 1 to 3 shown, this embodiment provides a seamless expansion joint structure based on spring bars, including a pair of bridge bodies with opposite ends. The bridge body is composed of a main beam, a bridge deck laid on top of the main beam, and a bridge deck pavement laid on top of the bridge deck. An unbonded layer is provided at the top of the end of the main beam, and a concave-convex UHPC board for connecting the bridge deck is provided between the tops of the unbonded layers. The inside of the board groove of the UHPC board to the surface layer is a filler pavement layer, and spring connection segments are provided for the steel bars in the board groove of the UHPC board.

[0030] In the embodiment of the present invention, the UHPC board is a cast-in-place board on site. The UHPC board presents a concave-convex shape with larger teeth. The concave part is the corresponding deformation adaptation area, and the convex part is the corresponding bearing area. The UHPC board is tied with steel bars between the bridge deck and the main beam, so that it has a good connection with the bridge deck and the main beam.

[0031] In the embodiment of the present invention, spring connection segments are provided for the steel bars in the deformation area of the UHPC board. The spring connection segments are formed by curling steel bars with a smaller diameter and are welded to the steel bars at both ends. The middle gap of the spring connection segments is filled with sponge foam. The outside of the spring connection segments is wrapped with a pvc pipe layer that isolates the aggregate, and the spring connection segments all need to be pre-treated for waterproofing.

[0032] In the embodiment of the present invention, the filler pavement layer is a polyurethane gravel mixture pavement layer, which has good elastoplasticity, horizontal deformation ability and vertical bearing capacity.

[0033] In the embodiment of the present invention, the filler pavement layer is connected to the bridge deck pavement and the upper surfaces are flush.

[0034] A construction method for a seamless expansion joint structure based on spring bars is carried out according to the following steps:

[0035] (1) In the factory, according to the drawing dimensions and on-site requirements, the steel bars of the spring connection segments required in the UHPC board are prefabricated as a whole, and anti-corrosion and rust-proof treatments are carried out;

[0036] (2) Before the erection of the main beam, the construction process is carried out normally according to the conventional steps. After the main beam is placed, caulking materials such as foam sponges are added;

[0037] (3) Then, place and lay a non-bonding layer at the corresponding positions between the main girders. The non-bonding layer is made of rubber;

[0038] (4) While laying the bridge deck reinforcement bars, tie the longitudinal and transverse reinforcement bars at the corresponding positions of this expansion joint. Tie the reinforcement bars of the spring connection section required in the UHPC plate to the bridge deck reinforcement bars and the extended reinforcement bars of the main girders, and then erect the formwork for the UHPC plate structure;

[0039] (5) Start the post-cast work, pour the bridge deck concrete and the UHPC plate. After pouring, carry out normal steam curing until the concrete is basically fixed and formed;

[0040] (6) Finally, carry out the paving of the ordinary asphalt layer of the bridge deck pavement and the laying of the polyurethane gravel mixture paving layer at the expansion joint, and make its upper surface flush and compacted. Then carry out maintenance, and the traffic can be opened after 3 - 5 hours.

[0041] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention in other forms. Any person skilled in the art may use the disclosed technical content to make changes or modifications into equivalent embodiments with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution content of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A seamless expansion joint structure based on spring ribs, characterized in that: It includes a pair of bridge bodies with opposite ends. The bridge body is composed of a main beam, a bridge deck laid on the top of the main beam, and a bridge deck pavement laid on the top of the bridge deck. It is characterized in that: a non-bonding layer is provided at the top of the end of the main beam, and a concave-convex UHPC board for connecting the bridge deck is provided between the tops of the non-bonding layers. The inside of the board groove of the UHPC board to the surface layer is a filler paving layer, and a spring connection section is provided for the steel bars in the board groove of the UHPC board; the UHPC board is a cast-in-place board on site. The UHPC board presents a concave-convex shape with large tooth openings. The concave part is the corresponding deformation adaptation area, and the convex part is the corresponding bearing area. The UHPC board is tied with steel bars to both the bridge deck and the main beam; a spring connection section is provided for the steel bars in the deformation area of the UHPC board. The spring connection section is formed by curling thin-diameter steel bars and welded to the steel bars at both ends. The middle gap of the spring connection section is filled with sponge foam, and the outside of the spring connection section is wrapped with a pvc pipe layer that isolates the aggregate; the filler paving layer is connected to the bridge deck pavement and the upper surfaces are flush.

2. The seamless expansion joint structure based on spring ribs according to claim 1, characterized in that: The filler paving layer is a polyurethane gravel mixture paving layer.

3. A construction method for a seamless expansion joint structure based on spring ribs as described in any one of claims 1-2, characterized in that, It is carried out according to the following steps: (1) At the factory, according to the drawing dimensions and on-site requirements, the steel bars of the spring connection sections required in the UHPC board are prefabricated as a whole, and anti-corrosion and rust-proof treatments are carried out. (2) Before erecting the main beam, the construction process is carried out normally according to the conventional steps. After the main beam is placed, foam sponge sealant is added. (3) Then, a non-bonding layer is placed and laid at the corresponding positions between the main beams. The non-bonding layer is rubber. (4) While laying the steel bars of the bridge deck, longitudinal and transverse steel bars are tied at the corresponding positions of this expansion joint. The steel bars of the spring connection sections required in the UHPC board are tied to the steel bars of the bridge deck and the steel bars extended from the main beam, and then the formwork erection of the UHPC board structure is carried out. (5) Start the post-cast work, carry out the pouring of the bridge deck concrete and the UHPC board. After the pouring is completed, normal steam curing is carried out until the concrete is fixed and formed. (6) Finally, the ordinary asphalt layer of the bridge deck pavement and the laying of the polyurethane gravel mixture paving layer at the expansion joint are carried out, and the upper surfaces are made flush and compacted. Then, curing is carried out, and the traffic can be opened after 3 - 5 hours.

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