A frame arch

Abstract

This utility model relates to a frame-type arch seat, comprising an arch seat, diagonal braces, and vertical braces, which are integrally cast to form a rigid frame. The diagonal braces are inclined and provide diagonal support to the arch seat, while the vertical braces are vertical and provide vertical support to the arch seat. The top of the arch seat is perpendicular to the arch axis when it connects with the arch rib, and the angle α between the tangent of the arch axis at the arch foot and the horizontal line is greater than the angle β between the axis of the diagonal braces and the horizontal line. The bottoms of the diagonal braces and vertical braces are respectively connected to an adjustable-elevation foundation. This utility model allows for adjustment of the lengths of the vertical and diagonal braces of the arch seat as needed, thus better adapting to terrains with large elevation differences and avoiding large-scale mountain excavation. The frame structure transforms the thrust of the arch rib into the synergistic force of the foundation, with a clear force transmission path and reasonable force distribution, which can significantly reduce the amount of foundation work and reduce the scale of the project. Different foundation methods can be selected according to the terrain and geological conditions, with a wide range of applications, reducing the foundation volume by 30% and shortening the foundation construction period by 25%.

Description

Technical Field

[0001] This utility model relates to a frame-type arch seat. Background Technology

[0002] During the construction of arch bridges in mountainous areas, it is common to encounter situations where there is a significant difference in terrain between the two banks. Conventional arch abutments using enlarged foundations (or inclined / vertical pile foundations) cannot effectively coordinate the elevation of the arch abutments on both banks: either large-scale excavation of the mountain is required in areas with higher terrain, or the scale of the enlarged foundation needs to be increased in areas with lower terrain to make the elevation of the arch abutments on both banks consistent.

[0003] To reduce mountain excavation or meet the longitudinal slope requirements of the route, the arch ribs are often adjusted, such as by setting high and low arches or sloping arches (the main arch is placed at an angle).

[0004] The high-low arch design, where the left and right half-spans of the arch bridge have different rise-to-span ratios, results in different rises for the arch ribs on both banks. The lower arch, with its smaller rise, has greater stiffness and bears more load, while the higher arch, with its larger rise and lower stiffness, experiences less load. The horizontal thrust at the arch foot is inversely proportional to the rise (the smaller the rise, the greater the thrust), leading to a significantly higher thrust for the lower arch compared to the higher arch. Because the arch axis of the high-low arch is tilted, it is less resistant to wind loads or seismic forces than a symmetrical arch, making it more prone to lateral instability.

[0005] The sloping arch (slanted arch) method has asymmetrical dead load, complex thrust direction at the arch foot, and poor adaptability to asymmetrical live load. At the same time, due to the inclination of the arch axis, the horizontal displacement direction caused by temperature is inconsistent with the direction of the dead load thrust, resulting in poor stress at the arch foot.

[0006] The uneven horizontal thrust at the arch feet of the high and low arches leads to an excessively large foundation for the low arch, while the inclined arch axis of the sloping arch experiences displacement that conflicts with the direction of the dead load under temperature load. Both pose a risk of instability and cannot flexibly adapt to terrains with large elevation differences. Summary of the Invention

[0007] To address the aforementioned issues, this invention proposes a frame-type arch support. The lengths of the vertical and diagonal braces of the arch support can be adjusted as needed, allowing for better adaptation to terrains with significant elevation differences and avoiding large-scale mountain excavation. The frame structure transforms the thrust of the arch ribs into the synergistic force of the foundation, resulting in a clear force transmission path and reasonable force distribution. This significantly reduces the amount of arch support work and lowers the project scale. Different foundation methods can be selected based on terrain and geological conditions, making it widely applicable. The foundation volume is reduced by 30%, and the foundation construction period is shortened by 25%.

[0008] The present invention adopts the following technical solution:

[0009] A frame-type arch base, characterized in that: it includes an arch base, diagonal braces, and vertical braces, which are integrally cast to form a rigid frame; the diagonal braces are inclined and provide diagonal support for the arch base, and the vertical braces are vertical and provide vertical support for the arch base; the top of the arch base is perpendicular to the arch axis when it connects with the arch rib, and the angle α between the tangent of the arch axis at the arch foot and the horizontal line is greater than the angle b between the axis of the diagonal braces and the horizontal line; the bottoms of the diagonal braces and the vertical braces are respectively connected to an adjustable-elevation foundation.

[0010] The foundation connected to the bottom of the diagonal brace is a diagonal brace enlarged foundation, and a diagonal brace toothed sill is provided at the bottom of the diagonal brace enlarged foundation. The foundation connected to the bottom of the vertical brace is a vertical brace enlarged foundation, and a vertical brace toothed sill is provided at the bottom of the vertical brace enlarged foundation. The diagonal brace enlarged foundation and the vertical brace enlarged foundation are suitable for situations where the bedrock is intact and the burial depth is shallow. The diagonal brace enlarged foundation is equipped with a diagonal brace toothed sill, and the vertical brace enlarged foundation is equipped with a vertical brace toothed sill to resist horizontal thrust.

[0011] The foundation connected to the bottom of the inclined brace is an inclined brace pile cap, and an inclined brace pile foundation is provided at the bottom of the inclined brace pile cap. The foundation connected to the bottom of the vertical brace is a vertical brace pile cap, and a vertical brace pile foundation is provided at the bottom of the vertical brace pile cap. The inclined brace pile cap and the vertical brace pile cap are suitable for soil foundations or situations where the bedrock is deeply buried. The inclined brace pile foundation and the vertical brace pile foundation can simultaneously resist vertical pressure and horizontal thrust.

[0012] The angle b between the axis of the diagonal brace and the horizontal line is in the range of 30°-55°, and b should satisfy... <a。

[0013] The beneficial effects of this utility model are:

[0014] (1) This utility model adopts a frame arch seat, and the length of the vertical and diagonal braces of the arch seat can be adjusted as needed. It can better adapt to terrain with large elevation differences, avoid large-scale mountain excavation, and reduce the amount of excavation by more than 40%.

[0015] (2) This utility model adopts a frame arch seat. The frame structure transforms the thrust of the arch rib into the synergistic force of the foundation. The force transmission path is clear and the force is reasonable, which can greatly reduce the amount of arch seat engineering and reduce the scale of the project.

[0016] (3) This utility model selects different foundation methods according to the terrain and geological conditions, has a wide range of applications, reduces the foundation volume by 30%, and shortens the foundation construction cycle by 25%. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model using an enlarged foundation.

[0018] Figure 2 This is a schematic diagram of the structure of the present invention using pile foundation.

[0019] In the diagram: 1-arch axis, 2-arch seat, 3-arch seat diagonal brace, 4-arch seat vertical brace, 5-1-diagonal brace enlarged foundation, 5-2-diagonal brace enlarged foundation toothed sill, 6-1-vertical brace enlarged foundation, 6-2-vertical brace enlarged foundation toothed sill, 7-1-diagonal brace pile cap, 7-2-diagonal brace pile foundation, 8-1-vertical brace pile cap, 8-2-vertical brace pile foundation, a-angle between the tangent of the arch axis at the arch foot and the horizontal line, b-angle between the diagonal brace axis and the horizontal line. Detailed Implementation

[0020] The technical solution (including preferred technical solution) of this utility model will be further described in detail below with reference to the accompanying drawings and by listing some optional embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0021] like Figure 1 , Figure 2 As shown, this utility model discloses a frame-type arch support, characterized by comprising an arch support 2, diagonal braces 3, and vertical braces 4, which are integrally cast to form a rigid frame. The diagonal braces 3 are inclined and provide diagonal support to the arch support 2, while the vertical braces 4 are vertically positioned to provide vertical support to the arch support 2. The top of the arch support 2 is perpendicular to the arch axis when it connects with the arch rib. The angle 'a' between the tangent of the arch axis 1 at the arch foot and the horizontal line is greater than the angle 'b' between the diagonal brace axis and the horizontal line. The bottoms of the diagonal braces 3 and the vertical braces 4 are respectively connected to adjustable-elevation foundations. This arch support allows conventional arch bridges to adapt to significant terrain differences or longitudinal slopes. The angle 'b' between the diagonal brace axis and the horizontal line can be adjusted within the range of 30°-55° according to the terrain, but should satisfy 'b < a', where 'a' is the angle between the tangent of the arch axis at the arch foot and the horizontal line, and this value is determined according to the stress requirements of the arch bridge.

[0022] like Figure 1 As shown, the foundation connected to the bottom of the diagonal brace 3 is a diagonal brace enlarged foundation 5-1, and a diagonal brace toothed sill 5-2 is provided at the bottom of the diagonal brace enlarged foundation 5-1. The foundation connected to the bottom of the vertical brace 4 is a vertical brace enlarged foundation 6-1, and a vertical brace toothed sill 6-2 is provided at the bottom of the vertical brace enlarged foundation 6-1. The diagonal brace enlarged foundation 5-1 and the vertical brace enlarged foundation 6-1 are suitable for situations where the bedrock is intact and the burial depth is shallow. The diagonal brace enlarged foundation 5-1 is equipped with a toothed diagonal brace 5-2, and the vertical brace enlarged foundation 6-1 is equipped with a vertical brace toothed sill 6-2 to resist horizontal thrust.

[0023] like Figure 2As shown, the foundation connected to the bottom of the inclined brace 3 is an inclined brace pile cap 7-1, and an inclined brace pile foundation 7-2 is provided at the bottom of the inclined brace pile cap 7-1. The foundation connected to the bottom of the vertical brace 4 is a vertical brace pile cap 8-1, and a vertical brace pile foundation 8-2 is provided at the bottom of the vertical brace pile cap 8-1. The inclined brace pile cap 7-1 and the vertical brace pile cap 8-1 are suitable for soil foundations or situations where the bedrock is deeply buried. The inclined brace pile foundation 7-2 and the vertical brace pile foundation 8-2 can simultaneously resist vertical pressure and horizontal thrust.

[0024] Those skilled in the art will readily understand that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, combinations, substitutions, improvements, etc., made under the spirit and principles of the present utility model are included within the protection scope of the present utility model.

Claims

1. A frame-type arch base, characterized in that: The structure includes an arch base (2), diagonal braces (3), and vertical braces (4), which are cast together to form a rigid frame. The diagonal braces (3) are inclined and provide diagonal support for the arch base (2), while the vertical braces (4) are vertical and provide vertical support for the arch base (2). The top of the arch base (2) is perpendicular to the arch axis when it connects with the arch rib. The angle α between the tangent of the arch axis at the arch foot and the horizontal line is greater than the angle b between the diagonal brace axis and the horizontal line. The bottoms of the diagonal braces (3) and the vertical braces (4) are respectively connected to an adjustable-elevation foundation.

2. The frame-type arch seat according to claim 1, characterized in that: The foundation connected to the bottom of the diagonal brace (3) is a diagonal brace enlarged foundation (5-1), and a diagonal brace toothed sill (5-2) is provided at the bottom of the diagonal brace enlarged foundation (5-1). The foundation connected to the bottom of the vertical brace (4) is a vertical brace enlarged foundation (6-1), and a vertical brace toothed sill (6-2) is provided at the bottom of the vertical brace enlarged foundation (6-1).

3. A frame-type arch seat according to claim 1, characterized in that: The foundation connected to the bottom of the inclined brace (3) is an inclined brace pile foundation (7-1), and an inclined brace pile foundation (7-2) is provided at the bottom of the inclined brace pile foundation (7-1). The foundation connected to the bottom of the vertical brace (4) is a vertical brace pile foundation (8-1), and a vertical brace pile foundation (8-2) is provided at the bottom of the vertical brace pile foundation (8-1).

4. A frame-type arch seat according to claim 1, characterized in that: The angle b between the axis of the diagonal brace and the horizontal line is in the range of 30°-55°, and b should satisfy... <a。

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