Prestressed concrete box girder bridge reinforcing structure

Abstract

The utility model discloses a prestressed concrete box girder bridge reinforcing structure, a girder of a box girder bridge is provided with a top plate, a bottom plate and a web plate between the top plate and the bottom plate, the reinforcing structure comprises a prestressed concrete plate fixed in the middle of the bottom plate, and a prestressed steel strand is arranged in the prestressed concrete plate along the bridge direction. The prestressed steel strands are symmetrically arranged on the two sides of the prestressed concrete plate, the two ends of each prestressed steel strand are anchored to tooth blocks respectively, and the tooth blocks are fixed to the bottom plate. The prestressed steel strands are additionally arranged at the bottom of the main beam, prestress is applied, the bearing capacity of the beam body can be improved, the vertical deformation condition of the beam body is improved, and durability is good. The transverse ribs are additionally arranged on the prestressed concrete plate, so that the transverse stress performance of the bottom of the beam can be improved, the torsional rigidity of the box body is improved, and the overall performance and the service life of the bridge are improved. Construction can be carried out in the box girder, and the operation environment is safe.

Description

TECHNICAL FIELD

[0001] The utility model belongs to bridge reinforcing technical field, especially a prestressed concrete box girder bridge reinforcing structure. BACKGROUND

[0002] The prestressed concrete box girder is the most common bridge structure form, is applied very widely, its span can reach dozens of meters even hundreds of meters, can satisfy the demand of general crossing. The concrete box girder has the advantages such as low cost, strength, rigidity and durability. At the same time, there are also long-term under the influence of overload, produce long-term deflection and cracking and other problems.

[0003] At present, there are millions of bridges in China, along with the development of China's economic society, the increase of bridge operation time and operation intensity, the bridge needing repair and reinforcement will be more and more, and the bridge reinforcing structure needs to be determined according to the actual situation. For the prestressed concrete box girder bridge, simple operation, good durability and economic and reasonable reinforcing structure need to be adopted according to different situations. UTILITY MODEL CONTENTS

[0004] The utility model provides a prestressed concrete box girder bridge reinforcing structure that is simple to operate, good in durability and economic and reasonable to solve the technical problems in the prior art.

[0005] The utility model provides a prestressed concrete box girder bridge reinforcing structure that is simple to operate, good in durability and economic and reasonable to solve the technical problems in the prior art.

[0006] The bottom of the prestressed concrete plate is connected with the bottom plate through the anchoring bar I.

[0007] A horizontal rib is arranged on the prestressed concrete plate, the bottom of the horizontal rib is connected with the bottom plate through the anchoring bar II, the horizontal rib is integrally poured with the prestressed concrete plate, and a structural joint is arranged between the side surface of the horizontal rib and the web.

[0008] The horizontal rib is arranged at the midspan position.

[0009] The horizontal rib is arranged at the position with greater transverse stress.

[0010] The utility model has the advantages and positive effects that: through adding prestressed steel strand in the bottom of the main beam, prestress is applied, the load bearing capacity of the beam body can be improved, the vertical deformation condition of the beam body is improved, and the durability is good. By increasing the cross rib on the prestressed concrete slab, the transverse stress performance of the beam bottom can be improved, the torsional rigidity of the box body is increased, and the overall performance and service life of the bridge are improved. The construction of the utility model can be carried out in the box girder, the operation environment is safe, and the construction, detection, acceptance and other environments are friendly. At the same time, after the reinforcement is completed, the appearance of the original bridge structure is not changed, has the advantages of keeping the original style, reducing the reconstruction cost, shortening the construction period, improving the safety and meeting the individualized demand. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is the facade schematic view of the utility model;

[0012] Figure 2 It is the plane schematic view of the utility model;

[0013] Figure 3 It is the cross section schematic view of the utility model;

[0014] Figure 4 It is the cross section schematic view of the cross rib of the utility model;

[0015] Figure 5 It is the cross section schematic view of the tooth block of the utility model.

[0016] In the drawing: 1, prestressed concrete slab; 2, prestressed steel strand; 3, cross rib; 4, tooth block. DETAILED DESCRIPTION

[0017] In order to further understand the invention content, characteristics and efficacy of the utility model, the following examples are cited, and the detailed description is as follows in conjunction with the drawings:

[0018] Please refer to Figures 1-5 A prestressed concrete box girder bridge reinforcing structure, the main beam of the box girder bridge has a top plate, a bottom plate and a web plate between the top plate and the bottom plate, the reinforcing structure comprises a prestressed concrete slab 1 fixed in the middle of the bottom plate, a prestressed steel strand 2 in the bridge direction is arranged in the prestressed concrete slab 1, the prestressed steel strand 2 is symmetrically arranged on both sides of the prestressed concrete slab 1, and the two ends of the prestressed steel strand 2 are respectively anchored on tooth blocks 4, and the tooth blocks 4 are fixed on the bottom plate. The prestressed concrete slab 1 is used for protecting the prestressed steel strand 2 and improving the structural rigidity.

[0019] In the embodiment, the bottom of the prestressed concrete slab 1 is connected with the bottom plate through the anchor I, and the construction is convenient. The horizontal rib 3 is arranged on the prestressed concrete slab 1, the horizontal rib 3 is connected with the bottom plate through the anchor II and is integrally poured with the prestressed concrete slab 1, and the structure joint is arranged between the side surface of the horizontal rib 3 and the web, and the construction is convenient. It is recommended that the horizontal rib 3 is arranged at the midspan position or the position with greater transverse stress. The side surface of the horizontal rib 3 and the web are physically isolated by using the closed-cell foam board or other materials, and then the structure joint is formed.

[0020] The design method of the above structure is as follows:

[0021] According to the overall calculation of the structure, the type and quantity of the prestressed steel strand are determined, and then the parameters such as the spacing of the prestressed steel strand and the arrangement of the tooth block are determined. According to the flatness of the existing bottom plate, the type of the bellows, the arrangement of the steel bars and the requirement of the protective layer, the thickness of the prestressed concrete slab is determined. According to the size of the existing bottom plate, the reinforcement and the radial force generated by the prestressed steel strand and other factors, the size and arrangement of the horizontal rib are determined. According to the type and tension of the prestressed steel strand and other parameters, the reinforcement of the tooth block and the anchor structure of the tooth block and the existing bottom plate are determined.

[0022] Although the preferred embodiment of the utility model is described above in combination with the drawings, the utility model is not limited to the above-mentioned specific implementation, the above-mentioned specific implementation is only illustrative, and is not restrictive, and the ordinary skilled in the art can make many forms under the inspiration of the utility model without departing from the purpose of the utility model and the scope protected by the claims, and these all belong to the protection scope of the utility model.

Claims

1. A prestressed concrete box girder bridge reinforcement structure, wherein the main beam of the box girder bridge has a top plate, a bottom plate, and a web plate between the top plate and the bottom plate, characterized in that: The reinforcement structure includes a prestressed concrete slab fixed in the middle of the base plate, in which prestressed steel strands are arranged in the direction of the bridge. The prestressed steel strands are symmetrically arranged on both sides of the prestressed concrete slab, and the two ends of the prestressed steel strands are respectively anchored on tooth blocks, which are fixed to the base plate.

2. The prestressed concrete box girder bridge reinforcement structure according to claim 1, characterized in that: The bottom of the prestressed concrete slab is connected to the base plate via embedded reinforcement I.

3. The prestressed concrete box girder bridge reinforcement structure according to claim 1, characterized in that: The prestressed concrete slab is provided with transverse ribs, the bottom of the transverse ribs is connected to the bottom plate through anchor bars II, and the transverse ribs are cast integrally with the prestressed concrete slab, and a structural seam is provided between the side surfaces and the web.

4. The prestressed concrete box girder bridge reinforcement structure according to claim 3, characterized in that: The transverse ribs are arranged at the mid-span position.

5. The prestressed concrete box girder bridge reinforcement structure according to claim 3, characterized in that: The transverse ribs are arranged at positions where the transverse force is greater.

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