Railway bridge pier shallow foundation structure

Abstract

The utility model relates to the technical field of road and bridge engineering, in particular to a railway bridge pier shallow foundation structure which comprises a bottom layer foundation, a top layer foundation and a pier body, the cross section area of the bottom layer foundation is larger than that of the top layer foundation, and the cross section area of the top layer foundation is larger than that of the pier body. The bottom layer foundation, the top layer foundation and the pier body are all composed of steel bar grids and concrete, the steel bar grids are composed of transverse steel bars and longitudinal steel bars which are bundled together, and a reinforcing layer is further arranged on the transverse steel bars of the bottom layer foundation. The bottom-layer foundation, the top-layer foundation and the pier body form a stepped structure, the bottom-layer foundation serves as a main bearing layer and effectively disperses stress of the base, the top-layer foundation is connected with the bottom layer through stepped transition to form a stress diffusion gradient layer, and the transverse steel bars and the longitudinal steel bars form a bidirectional reinforcement structure system. The longitudinal steel bars achieve reinforcement ratio gradient transition through step type truncation, the stability and the bearing capacity can be improved, and convenience is provided for construction and maintenance.

Description

TECHNICAL FIELD

[0001] The utility model relates to road and bridge engineering technical field, concretely is a railway bridge pier shallow foundation structure. BACKGROUND

[0002] The pier of the bridge load bearing core structure, the importance of the foundation design is self-evident, is the key to ensuring the bridge seismic performance and safe operation.In the traditional pier foundation design, shallow foundation is widely used because of its simple construction, low cost.However, the traditional shallow foundation structure usually adopts one-way reinforcement or simple rectangular section design, and the bending and shear capacity is limited, especially in high-intensity seismic region, easy to crack, tilt and even collapse, seriously threaten the safety of the bridge. SUMMARY

[0003] In order to make up for the above shortcomings, the utility model provides a railway bridge pier shallow foundation structure to solve the problem of how to improve the bending and shear capacity of the railway bridge pier in the above background technology.

[0004] The technical scheme of the utility model is:

[0005] A railway bridge pier shallow foundation structure, including bottom layer foundation, top layer foundation and pier body, the cross section area of bottom layer foundation is greater than the cross section area of top layer foundation, the cross section area of top layer foundation is greater than the cross section area of pier body, bottom layer foundation, top layer foundation and pier body are all composed of reinforced mesh and concrete, the reinforced mesh is composed of transverse reinforcement and longitudinal reinforcement that are bundled with each other, and a reinforcing layer is further arranged on the transverse reinforcement of bottom layer foundation.

[0006] Preferably, the cross section of bottom layer foundation, top layer foundation and pier body is rectangular.

[0007] Preferably, the reinforcing layer is reinforcing steel.

[0008] Preferably, the reinforcing steel is H-shaped steel.

[0009] Preferably, the H-shaped steel is Q345B grade hot-rolled steel.

[0010] Preferably, the H-shaped steel is welded and fixed on the transverse reinforcement.

[0011] Preferably, the H-shaped steel is fixedly connected with the transverse reinforcement through high-strength bolts.

[0012] Compared with the prior art, the utility model has the beneficial effects that:

[0013] The bottom layer foundation, the top layer foundation and the pier body form a stepped structure, the bottom layer foundation serves as a main bearing layer, effectively disperses the base stress, the top layer foundation is connected with the bottom layer through the stepped transition, forms a stress diffusion gradient layer, increases longitudinal steel bars, so that the transverse steel bars and the longitudinal steel bars form a bidirectional reinforcement structure system, the longitudinal steel bars realize reinforcement ratio gradient transition through the stepped truncation, can improve stability and bearing capacity, and also provide convenience for construction and maintenance. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a three-dimensional structure schematic view of the railway bridge pier shallow foundation structure of the utility model;

[0015] Figure 2 It is a top view of the railway bridge pier shallow foundation structure of the utility model;

[0016] Figure 3 It is a side view of the railway bridge pier shallow foundation structure of the utility model;

[0017] Figure 4 It is a partial sectional view of the railway bridge pier shallow foundation structure of the utility model.

[0018] In the drawing:

[0019] 1, bottom layer foundation; 2, top layer foundation; 3, pier body; 4, concrete; 5, transverse steel bar; 6, longitudinal steel bar; 7, H-shaped steel. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0021] Please refer to Figures 1-4 The above technical solutions are described in detail through the following embodiments.

[0022] A railway bridge pier shallow foundation structure, comprising a bottom layer foundation 1, a top layer foundation 2 and a pier body 3, the cross-sectional area of the bottom layer foundation 1 is greater than that of the top layer foundation 2, the cross-sectional area of the top layer foundation 2 is greater than that of the pier body 3, the bottom layer foundation 1, the top layer foundation 2 and the pier body 3 are all composed of a steel bar grid and concrete 4, the steel bar grid is composed of transverse steel bars 5 and longitudinal steel bars 6 bundled with each other, and the transverse steel bars 5 of the bottom layer foundation 1 are additionally provided with a reinforcing layer.

[0023] The bottom foundation 1, the top foundation 2 and the pier body 3 form a stepped structure, the bottom foundation 1 serves as a main bearing layer, effectively disperses the base stress, the top foundation 2 is connected with the bottom layer through the stepped transition, forms a stress diffusion gradient layer, increases the longitudinal steel bars 6, so that the transverse steel bars 5 and the longitudinal steel bars 6 form a bidirectional reinforcement structure system, the longitudinal steel bars 6 realize the reinforcement ratio gradient transition through the stepped truncation, can improve the stability and the bearing capacity, and also provide convenience for construction maintenance.

[0024] The bottom foundation 1, the top foundation 2 and the pier body 3 are all rectangular in cross section, the rectangular cross section shape is adopted, stress can be uniformly transmitted, the ductility and the seismic performance of the structure are improved by reasonably arranging the steel bars and cooperating with the reinforcing layer, and the structure is suitable for high-intensity seismic areas.

[0025] The reinforcing layer is reinforcing steel, and the reinforcing steel has good connection reliability.

[0026] The reinforcing steel is H-shaped steel 7, the H-shaped steel 7 can be used as a carrier of a distributed optical fiber sensor, and can realize real-time three-dimensional monitoring of foundation settlement and crack evolution.

[0027] The H-shaped steel 7 is made of Q345B hot-rolled steel, and the steel has good mechanical properties, plasticity and weldability.

[0028] The H-shaped steel 7 is welded and fixed on the transverse steel bars 5, and the welded fixing mode is more firm.

[0029] The H-shaped steel 7 is fixedly connected with the transverse steel bars 5 through high-strength bolts, and the installation convenience of the H-shaped steel 7 is improved.

[0030] The installation steps are as follows: after the foundation pit excavation is completed, the H-shaped steel 7 prefabrication and the steel mesh installation are carried out, operation is carried out according to the design requirements and the construction specification, the position of the H-shaped steel 7 and the steel mesh is ensured to be accurate and firm, then the foundation cast-in-place operation is carried out, the concrete 4 of the bottom foundation 1 and the top foundation 2 is poured in layers, and after the concrete 4 pouring is completed, the pier body 3 is poured.

Claims

1. A railway bridge pier shallow foundation structure, characterized by: The application relates to a reinforced concrete pier, which comprises a bottom foundation (1), a top foundation (2) and a pier body (3), the cross-sectional area of the bottom foundation (1) is larger than that of the top foundation (2), the cross-sectional area of the top foundation (2) is larger than that of the pier body (3), the bottom foundation (1), the top foundation (2) and the pier body (3) are all composed of a steel bar grid and concrete (4), the steel bar grid is composed of transverse steel bars (5) and longitudinal steel bars (6) which are tied with each other, and a reinforcing layer is arranged on the transverse steel bars (5) of the bottom foundation (1).

2. The railway bridge pier shallow foundation structure according to claim 1, characterized in that: The cross sections of the bottom foundation (1), the top foundation (2) and the pier body (3) are all rectangular.

3. The railway bridge pier shallow foundation structure according to claim 1 or 2, characterized in that: The reinforcing layer is reinforcing steel.

4. The railway bridge pier shallow foundation structure according to claim 3, wherein: The reinforcing steel is H-shaped steel (7).

5. The railway bridge pier shallow foundation structure according to claim 4, wherein: The H-shaped steel (7) is made of Q345B hot-rolled steel.

6. The railway bridge pier shallow foundation structure according to claim 5, wherein: The H-shaped steel (7) is welded and fixed on the transverse steel bars (5).

7. The railway bridge pier shallow foundation structure according to claim 5, characterized in that: The H-shaped steel (7) is fixedly connected with the transverse steel bars (5) through high-strength bolts.

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