Steel box arch bridge arch foot steel-concrete combined section structure

Abstract

The invention relates to the technical field of municipal bridge engineering, and particularly discloses a steel box arch bridge arch foot steel-concrete combined section structure which is connected with a steel box arch ring and a bearing platform. The two ends of the steel box extension section are connected with an arch ring and a bearing platform respectively, the concrete structure is arranged in the steel box extension section, and the bottom plate is arranged on the side, close to the bearing platform, of the steel box extension section and installed on the bearing platform. The steel box extending section is arranged and extends to the top face of the bearing platform, the steel box concrete integral arch springing is formed, the landscape effect of an arch ring is improved, and the bearing capacity of the arch springing is improved; the steel box extension section is connected with the steel box arch ring, and the concrete structure is wrapped in the steel box extension section, so that no steel-concrete interface exists between the steel box arch ring and the steel box extension section serving as an arch foot, diseases are avoided, the service life of the steel box extension section is greatly prolonged, and the maintenance cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of municipal bridge engineering technology, and more specifically, to a steel-concrete composite section structure for the arch foot of a steel box arch bridge. Background Technology

[0002] In existing steel box arch bridges, a steel-concrete composite section is often set at the arch foot, with the interface perpendicular to the arch axis. This approach has the following problems:

[0003] The steel box arch and the concrete section are made of different materials, with a clear boundary, resulting in a poor landscape effect;

[0004] The difference in material strength and stiffness at the steel-concrete interface in the steel-concrete joint section is significant, which can easily lead to defects.

[0005] The limited load-bearing capacity of reinforced concrete restricts the size of the arch foot, often resulting in an oversized arch foot. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a steel-concrete composite section structure for the arch foot of a steel box arch bridge.

[0007] The solution adopted by this invention to solve the technical problem is:

[0008] A steel-concrete composite section structure for the arch foot of a steel box arch bridge, connected to the steel box arch ring and the pier cap, includes a steel box extension section connected to the arch ring and the pier cap at both ends respectively, a concrete structure set in the steel box extension section, and a base plate set in the steel box extension section near the pier cap and installed on the pier cap.

[0009] In some possible implementations,

[0010] It also includes stiffening ribs installed on the base plate and used to connect the base plate to the outside of the steel box extension.

[0011] In some possible implementations,

[0012] The steel box extension is located on the extension line of the steel box arch and has a concrete cavity inside; the concrete structure is located inside the concrete cavity.

[0013] In some possible implementations,

[0014] The concrete structure includes shear studs installed on the inner side wall of the concrete cavity, reinforcing bars located in the concrete cavity with one end extending into the foundation, and concrete filling the concrete cavity.

[0015] In some possible implementations,

[0016] The concrete is micro-expansion concrete.

[0017] In some possible implementations,

[0018] A steel mesh is provided at one end of the concrete cavity near the foundation.

[0019] In some possible implementations,

[0020] Shear studs are provided on the base plate.

[0021] In some possible implementations,

[0022] The steel box extension section is integrally formed with the steel box arch.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] This invention improves the visual appeal of the arch by setting a steel box extension section and extending it to the top surface of the pier, forming a monolithic steel box concrete arch foot, and increases the load-bearing capacity of the arch foot.

[0025] The steel box extension section of this invention is connected to the steel box arch ring, and the concrete structure is wrapped inside it. This means that there is no steel-concrete interface between the steel box arch ring and the steel box extension section, which serves as the arch foot, and no defects will occur. This greatly improves its service life and reduces maintenance costs.

[0026] This invention significantly improves the load-bearing capacity of the arch foot by extending the steel box section;

[0027] This invention has a simple structure and is highly practical. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the present invention;

[0029] Figure 2 This is a cross-sectional view of the present invention;

[0030] Figure 3 A top view of the present invention;

[0031] The components are: 1. Steel box extension; 2. Concrete structure; 3. Base plate; 4. Stiffening ribs; 5. Shear studs II; 6. Reinforcing bars; 7. Reinforcing mesh; 10. Steel box arch; 20. Foundation. Detailed Implementation

[0032] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, "a" or "one," etc., do not indicate a quantity limitation, but rather indicate the existence of at least one. In the implementation of this application, "and / or" describes the association relationship of related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. In the description of the embodiments of this application, unless otherwise stated, "multiple" means two or more. For example, multiple positioning posts refer to two or more positioning posts. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0033] The present invention will now be described in detail.

[0034] like Figures 1-3 As shown:

[0035] A steel-concrete composite section structure for the arch foot of a steel box arch bridge, connected to the steel box arch ring 10 and the pier cap 20, includes a steel box extension section 1 connected to the arch ring and the pier cap 20 at both ends, a concrete structure 2 disposed within the steel box extension section 1, and a base plate 3 disposed on the side of the steel box extension section 1 near the pier cap 20 and installed on the pier cap 20; the steel box extension section 1, the concrete structure 2, and the base plate 3 will serve as the arch foot and connect to the steel box arch ring 10.

[0036] Compared with the prior art, this invention places both the steel-concrete composite section and the reinforced concrete section within the steel box extension section 1. The steel box extension section 1 encloses the reinforced concrete section, eliminating the lack of a steel-concrete interface in the arch and preventing defects. The steel box arch 10 and the steel box extension section 1 are integrally formed. During the concrete construction of the reinforced concrete section, the steel box extension section 1 serves as a template to shape the reinforced concrete section. After the reinforced concrete section is formed, it does not need to be removed, thereby significantly improving the load-bearing capacity of the arch foot. The top surface of the base plate 3 is coplanar with the top surface of the foundation 20.

[0037] The steel box extension section 1 and the steel box arch ring 10 are made of the same material;

[0038] In some possible implementations, in order to effectively strengthen the connection between the base plate 3 and the steel box extension 1;

[0039] It also includes stiffening ribs 4 installed on the base plate 3 and used to connect the base plate 3 with the outer side of the steel box extension section 1.

[0040] In some possible implementations,

[0041] The steel box extension section 1 is located on the extension line of the steel box arch 10 and has a concrete chamber inside; the concrete structure 2 is located inside the concrete chamber.

[0042] In order to effectively realize the transformation of the steel box extension section 1 into a concrete structure 2;

[0043] The concrete structure 2 includes shear studs 1 set on the inner side wall of the concrete cavity, steel bars 6 located in the concrete cavity with one end extending into the foundation 20, and concrete filling the concrete cavity.

[0044] The concrete structure 2 will effectively connect the steel box extension 1 and the foundation 20.

[0045] In some possible implementations,

[0046] The concrete is micro-expansion concrete.

[0047] In some possible implementations, in order to strengthen the connection between the base plate 3 and the foundation 20;

[0048] A steel mesh 7 is provided at one end of the concrete cavity near the foundation 20; shear studs 5 are provided on the base plate 3.

[0049] Compared with the prior art, the steel box arch 10 of the present invention extends to the pier 20, ensuring the consistency of the appearance and material of the steel box arch 10, without obvious boundaries, and with better landscape effect.

[0050] The steel box arch ring 10 has no steel-concrete interface and no defects.

[0051] The extension section of the steel arch ring can serve as a molding template for concrete structure 2, and since it is not removed after construction on the outside, it greatly improves the load-bearing capacity of the arch foot.

[0052] This invention is not limited to the specific embodiments described above. The invention extends to any new feature or combination disclosed in this specification, as well as any new method or process step or combination disclosed herein.

Claims

1. A steel-concrete composite section structure for the arch foot of a steel box arch bridge, connected to the steel box arch ring and the pier cap, characterized in that, It includes a steel box extension section that is connected to the arch and the pier at both ends, a concrete structure set inside the steel box extension section, and a base plate set on the side of the steel box extension section near the pier and installed on the pier.

2. The steel-concrete composite section structure at the arch foot of a steel box arch bridge according to claim 1, characterized in that, It also includes stiffening ribs installed on the base plate and used to connect the base plate to the outside of the steel box extension.

3. The steel-concrete composite section structure at the arch foot of a steel box arch bridge according to claim 2, characterized in that, The steel box extension is located on the extension line of the steel box arch and has a concrete cavity inside; the concrete structure is located inside the concrete cavity.

4. The steel-concrete composite section structure at the arch foot of a steel box arch bridge according to claim 3, characterized in that, The concrete structure includes shear studs installed on the inner side wall of the concrete cavity, reinforcing bars located in the concrete cavity with one end extending into the foundation, and concrete filling the concrete cavity.

5. The steel-concrete composite section structure at the arch foot of a steel box arch bridge according to claim 4, characterized in that, The concrete is micro-expansion concrete.

6. The steel-concrete composite section structure at the arch foot of a steel box arch bridge according to claim 1, characterized in that, A steel mesh is provided at one end of the concrete cavity near the foundation.

7. The steel-concrete composite section structure at the arch foot of a steel box arch bridge according to claim 1, characterized in that, Two shear studs are provided on the base plate.

8. The steel-concrete composite section structure at the arch foot of a steel box arch bridge according to claim 1, characterized in that, The steel box extension section is integrally formed with the steel box arch.

9. The steel-concrete composite section structure at the arch foot of a steel box arch bridge according to claim 1, characterized in that, The top surface of the base plate is coplanar with the top surface of the foundation.

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