Bridge abutment foundation and bridge abutment structure

Abstract

The utility model discloses a bridge abutment foundation and a bridge abutment structure, the bridge abutment foundation comprises a base arranged at the bottom of a side slope, a fitting slope foundation arranged on the base and a horizontal foundation arranged at the top of the fitting slope foundation, the fitting slope foundation is anchored on the side slope, the horizontal plane of the horizontal foundation is parallel, and the horizontal plane of the horizontal foundation is parallel to the base. And a bridge abutment body is arranged on the horizontal foundation. The overall structure is suitable for the actual terrain of the bridge site, so that the structure is simple, and the construction difficulty is low.

Description

Technical Field

[0001] The utility model belongs to the field of highway bridges, and in particular relates to an abutment foundation and an abutment structure. Background Art

[0002] The abutment foundation is directly supported on the foundation and is the key part for transferring the loads of the upper and lower structures to the foundation. While transferring the load, the foundation itself is also required to have sufficient strength, rigidity and stability to ensure the safety and reliability of the bridge structure during operation.

[0003] In recent years, bridge construction has developed rapidly in deep mountain valleys, and examples of building abutment foundations on steep rock walls are common. Due to the complex and changeable terrain, steep terrain, and sensitive and fragile environment in mountainous areas, the construction of bridges in mountainous areas has become difficult. At present, the expanded foundation is often selected as the foundation of the abutment of mountain bridges because of its simple structure and clear force. However, the expanded foundation structure is large in size. In order to meet the space requirements of the expanded foundation, the excavation range will inevitably be further increased, which will increase the difficulty of construction and damage the mountain structure, affecting the ecological environment. Utility Model Content

[0004] The utility model aims to provide an abutment foundation and an abutment structure to solve the technical problems of large excavation volume and high difficulty caused by terrain difference during the construction of the abutment foundation.

[0005] To achieve the above purpose, the specific technical solution of the utility model is as follows:

[0006] A bridge abutment foundation comprises a base arranged at the bottom of a slope, a slope-adhering foundation arranged on the base, and a horizontal foundation arranged on the top of the slope-adhering foundation, wherein the slope-adhering foundation is anchored on the slope and the horizontal foundation is parallel to a horizontal plane.

[0007] Therefore, the abutment foundation of the utility model utilizes the structural features of the horizontal foundation, the base and the slope-adjacent foundation to form an interconnected and overall stable abutment foundation. The horizontal foundation supports the abutment body, while the base is firmly placed at the bottom of the slope, and the slope-adjacent foundation achieves the stability of the abutment through anchoring connection with the slope. This design not only reduces the excavation scope of the foundation and reduces the damage to the mountain structure, but also improves the construction efficiency and the stability of the overall abutment, providing a more reliable and applicable solution for mountain bridge construction.

[0008] Furthermore, the horizontal foundation is embedded in the slope through the tooth grooves, and the embedding depth is 1 to 2 meters. The embedding form further improves the stability and earthquake resistance of the abutment foundation, ensuring the structural safety.

[0009] Furthermore, the slope-fitting foundation is in line with the side slope. The abutment foundation is set in a slope-fitting step-type so that the abutment foundation is suitable for the steep rock wall terrain, thereby reducing the excavation range, reducing the excavation engineering volume, reducing the damage to the mountain structure, and protecting the local ecological environment. At the same time, the wall and back slope rates of the slope-fitting foundation can be reasonably determined according to the needs of the project, with high flexibility and a wide range of applications.

[0010] Furthermore, the upper surface of the base is parallel to the horizontal plane, and the lower surface of the base is provided with a multi-step ladder structure along its length direction, and the step structure matches the slope of the bottom of the slope. After the base is arranged in a stepped shape, the foundation volume can be effectively reduced, the engineering cost can be reduced, and the economic applicability can be improved.

[0011] Furthermore, a collar edge is reserved on the upper surface of the base.

[0012] Based on the same design concept, the utility model also provides an abutment structure, which includes an abutment body and the abutment foundation as described above, wherein the abutment body is arranged on the upper surface of the horizontal foundation.

[0013] The utility model has the following advantages: the overall structure of the utility model is suitable for the actual terrain at the bridge location, so that the structure is simple and the construction difficulty is small. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the side structure of the abutment of the utility model;

[0015] Figure 2 It is a schematic diagram of the ladder structure of the utility model.

[0016] Explanation of markings in the figure: 1. Abutment body; 2. Anchor rod; 3. Tooth groove; 4. Horizontal foundation; 5. Slope foundation; 6. Base; 61. Step structure; 62. Flange; 8. Slope. DETAILED DESCRIPTION

[0017] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings.

[0018] like Figure 1As shown, a bridge abutment structure of the present embodiment includes a bridge abutment body 1 and a bridge abutment foundation, wherein the bridge abutment foundation includes a base 6 arranged at the bottom of the slope 8, a slope-adhering foundation 5 arranged on the base 6, and a horizontal foundation 4 arranged on the top of the slope-adhering foundation 5, wherein the slope-adhering foundation 5 is anchored on the slope 8, and the horizontal foundation 4 is parallel to the horizontal plane. Specifically, a flange 62 is reserved on the upper surface of the base 6 and then consolidated with the slope-adhering foundation 5. The bridge abutment body 1 is arranged on the horizontal foundation 4. The slope-adhering foundation 5 is in contact with the slope 8, and the back slope rate of the slope-adhering foundation 5 is suitable for the actual slope of the slope 8, and the wall slope rate can refer to the general inclined retaining wall. Preferably, one end of the anchor rod 2 is embedded in the slope 8, and the other end of the anchor rod 2 is reserved with a certain length to be anchored in the slope-adhering foundation 5.

[0019] As a preferred embodiment of the utility model, the horizontal foundation 4 is embedded in the slope 8. The horizontal foundation 4 is embedded in the slope through the tooth groove 3, and the embedding depth is 1 to 2 m. The embedding depth is preferably 1.5 m.

[0020] like Figure 2 As shown, as another preferred embodiment of the utility model, the upper surface of the base 6 is parallel to the horizontal plane, and the lower surface of the base 6 is provided with a multi-step step structure 61 along its length direction, and the step structure 61 matches the slope of the bottom of the slope 8.

[0021] This embodiment also provides a construction method for the above-mentioned abutment structure, comprising the following steps:

[0022] Step 1: excavate the tooth groove 3 for embedding the horizontal foundation 4 and the pit of the base 6. The depth of the tooth groove 3 can be determined according to the embedding requirements, and the pit of the base 6 can be excavated according to the lateral terrain at the bottom of the slope to ensure that the rock embedding depth of the pit of the base 6 is not less than 1.0m.

[0023] Step 2: Clean the weathered rocks and partially broken rocks at the slope 8 and the bottom of the slope, and fill the holes with the same grade of concrete as the slope foundation 5.

[0024] Step 3: Drill a hole on the slope 8. The hole diameter can be determined according to the size of the anchor rod 2, and the drilling depth depends on the geological conditions. The hole should have a certain inclination. After the hole is formed, the anchor rod 2 is inserted and grouted. The anchor rod 2 is anchored into the slope foundation 5 with a length of not less than 1.0m.

[0025] Step 4: Set up the formwork and tie the surface anti-cracking steel mesh, and pour the base 6, slope foundation 5, tooth groove 3, and horizontal foundation 4 from bottom to top. When pouring in stages, the lower layer of concrete needs to be roughened.

[0026] Step 5: After the slope foundation reaches the designed strength, continue the construction of the upper abutment body 1.

[0027] The transverse steps of the base 6 can be flexibly set to multiple levels according to the slope of the bottom of the slope 8, and the base elevation is determined by the terrain elevation. The horizontal foundation 4 is adapted to the bottom plate of the abutment body 1, and the horizontal foundation 4 can be applied to the intersection after expansion. The base 6, the slope foundation 5, the tooth groove 3, and the horizontal foundation 4 can adopt the same strength grade.

[0028] Specifically, taking a highway bridge built in a "V"-shaped deep canyon as an example, the abutment is located on a steep rock wall. In order to meet the needs of abutment setting, the top surface of the expanded foundation is an eight-shaped trapezoid, with a foundation long side width of 26.0m, a foundation short side width of 12.0m, a foundation length of 10.0m, and a foundation height of 13.5m. The amount of concrete used for the traditional expanded foundation is 2565m 3 , steel consumption 56.5t, excavation volume 1480.7m 3 After adopting the slope foundation of this embodiment, the amount of concrete used is 1292m 3 , steel consumption 30.7t, excavation volume 165.8m 3 . In comparison, the amount of concrete used is reduced by 50%, the amount of steel bars used is reduced by 46%, and the amount of excavation is reduced by 89%. In summary, the utility model of the slope-adhering step foundation greatly reduces the amount of mountain excavation, minimizes the impact on the local environment during the construction period, and avoids the construction risks associated with large-scale rock slope excavation while protecting the ecological environment. The amount of materials such as concrete and steel bars used is also relatively small, which is significantly economical.

[0029] It is understood that the present invention is described by some embodiments, and those skilled in the art are aware that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A bridge abutment foundation, characterized in that: The invention comprises a base (6) arranged at the bottom of a slope (8), a slope-adhering foundation (5) arranged on the base (6), and a horizontal foundation (4) arranged on the top of the slope-adhering foundation (5), wherein the slope-adhering foundation (5) is anchored on the slope (8), and the horizontal foundation (4) is parallel to a horizontal plane.

2. The abutment foundation according to claim 1, characterized in that: The horizontal foundation (4) is embedded in the side slope (8); the horizontal foundation (4) is embedded in the side slope (8) through the tooth groove (3), and the embedding depth is 1 to 2 meters.

3. The abutment foundation according to claim 1, characterized in that: The slope-adhering foundation (5) is in contact with the side slope (8).

4. The abutment foundation according to claim 1, characterized in that: The upper surface of the base (6) is parallel to the horizontal plane, and the lower surface of the base (6) is provided with a multi-step ladder structure (61) along its length direction, and the step structure (61) matches the slope of the bottom of the slope (8).

5. The abutment foundation according to claim 1, characterized in that: A collar edge (62) is reserved on the upper surface of the base (6).

6. A bridge abutment structure, characterized in that: It comprises an abutment body (1) and an abutment foundation as described in any one of claims 1 to 5, wherein the abutment body (1) is arranged on the upper surface of the horizontal foundation (4).

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