Novel frame type enlarged foundation skewback structure of truss type arch bridge

Abstract

The utility model relates to the field of engineering, in particular to a novel frame type enlarged foundation skewback structure of a truss type arch bridge, which comprises an enlarged foundation. The frame columns are connected to the expanded foundation, the frame columns are arranged corresponding to the chord members, and the chord members extend into the frame columns; every two adjacent frame columns in the transverse direction are connected through the corresponding transverse straining beams; and two longitudinal adjacent frame columns are connected through the longitudinal tie beams. The design thought of'expanded foundation + frame structure 'is utilized, the frame structure is formed through the frame columns, the transverse straining beams and the longitudinal straining beams, the frame columns serve as chord member force transmission paths, the structural rigidity and stability are improved through the transverse straining beams and the longitudinal straining beams, concrete on non-chord member main force transmission paths is deducted, the dead weight of the skewback is reduced, the masonry amount is reduced, and the construction efficiency is improved. The proportion of the foundation stress caused by the dead weight of the skewback in the total foundation stress is obviously reduced, meanwhile, the environmental damage is small, the load transmission path is clear, and the foundation stress is simple and reasonable.

Description

Technical Field

[0001] This utility model relates to the field of engineering technology, and in particular to a novel frame-type enlarged foundation arch structure for truss arch bridges. Background Technology

[0002] Arch bridges are a common type of bridge. Due to their heavy structural weight, the arch ring is primarily a load-bearing component. Without tie rods, the arch foot bears not only significant vertical forces but also substantial horizontal forces, especially for long-span arch bridges where the foundations bear even greater loads. Therefore, long-span arch bridges require high-capacity foundations.

[0003] Currently, enlarged foundations are still widely used by designers for long-span arch bridges due to their convenient construction, mature technology, short construction period, and clear stress distribution. However, their large size, large amount of masonry, and heavy weight make them difficult to apply to foundations with poor geological conditions. To ensure that the base stress meets design requirements, it is often necessary to increase the size of the enlarged foundation. This increases the amount of foundation excavation and the proportion of base stress caused by the foundation's self-weight to the total base stress. Utility Model Content

[0004] The purpose of this utility model is to provide a novel frame-type enlarged foundation arch seat structure for truss arch bridges, addressing the problems of large size, large amount of masonry, heavy weight, and large proportion of base stress caused by self-weight in the existing traditional enlarged foundation.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A novel frame-type enlarged foundation arch abutment structure for a truss arch bridge includes:

[0007] Expand the foundation;

[0008] A frame column is connected to the enlarged foundation, and the frame column is configured to correspond to a chord member, which extends into the frame column.

[0009] A transverse beam connects two adjacent frame columns laterally.

[0010] The longitudinal beams connect two adjacent frame columns in the longitudinal direction.

[0011] This invention discloses a novel frame-type enlarged foundation arch abutment structure for a truss arch bridge. Utilizing the design concept of "enlarged foundation + frame structure," the frame structure is formed by the frame columns, transverse beams, and longitudinal beams. The frame columns serve as the force transmission path for the chord members, while the transverse and longitudinal beams increase structural stiffness and stability. By deducting the concrete along the main force transmission path of the non-chord members, the self-weight of the arch abutment is reduced, as is the amount of masonry work. The proportion of base stress caused by the self-weight of the arch abutment to the total base stress is significantly decreased. Simultaneously, it exhibits minimal environmental damage, a clear load transfer path, and a simple and rational foundation stress distribution. Under the same geological conditions, compared to a solid enlarged foundation arch abutment, this arch abutment structure is lighter, requires less masonry work, has less environmental damage, is easier to construct, and is more economical.

[0012] As a preferred technical solution of this utility model, the frame column is a variable cross-section column, and the cross-sectional dimension of the frame column on the side closer to the enlarged foundation is larger than the cross-sectional dimension of the frame column on the side farther away from the enlarged foundation.

[0013] As a preferred technical solution of this utility model, the frame column includes a variable cross-section column and a constant cross-section column. The constant cross-section column is connected to the variable cross-section column, and the variable cross-section column is connected to the enlarged foundation. The cross-sectional dimension of the variable cross-section column on the side closer to the enlarged foundation is larger than the cross-sectional dimension of the variable cross-section column on the side closer to the constant cross-section column.

[0014] As a further preferred technical solution of this utility model, the uniform cross-section column adopts a prism structure or a cylindrical structure.

[0015] As a further preferred technical solution of this utility model, both the transverse beam and the longitudinal beam are connected to the side wall of the column with uniform cross-section.

[0016] As a further preferred technical solution of this utility model, the transverse beam and the longitudinal beam are located in the same plane.

[0017] As a further preferred technical solution of this utility model, the variable cross-section column adopts a frustum structure or a truncated cone structure.

[0018] As a preferred embodiment of this invention, the distance from the frame column to the edge of the enlarged foundation is less than or equal to the thickness of the enlarged foundation.

[0019] As a preferred technical solution of this utility model, the frame columns are arranged in an array on the enlarged basis.

[0020] As a further preferred technical solution of this utility model, the frame column includes four columns, which are located at the four vertices of the rectangle on the enlarged basis.

[0021] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0022] This utility model discloses a novel frame-type enlarged foundation arch abutment structure for a truss arch bridge. Utilizing the design concept of "enlarged foundation + frame structure," the frame structure is formed by the frame columns, transverse beams, and longitudinal beams. The frame columns serve as the force transmission path for the chord members, while the transverse and longitudinal beams increase structural stiffness and stability. By deducting the concrete along the main force transmission path of the non-chord members, the self-weight of the arch abutment is reduced, as is the amount of masonry work. The proportion of base stress caused by the self-weight of the arch abutment to the total base stress is significantly reduced. Simultaneously, it has minimal environmental impact, a clear load transfer path, and a simple and rational foundation stress distribution. Under the same geological conditions, compared with a solid enlarged foundation arch abutment, this arch abutment structure has a lighter self-weight, less masonry work, less environmental impact, is convenient to construct, and is economical. Attached Figure Description

[0023] Figure 1 A three-dimensional structural diagram of a frame-type enlarged foundation arch structure;

[0024] Figure 2 A schematic diagram of the elevation structure of a frame-type enlarged foundation arch structure;

[0025] Figure 3 This is a projection of the frame-type enlarged foundation arch structure along the arch ring axis.

[0026] The markings in the diagram are: 1-Expanded foundation, 2-Frame column, 3-Chord, 4-Transverse beam, 5-Longitudinal beam. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to experimental examples and specific embodiments. However, this should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0028] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of this utility model is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.

[0029] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0030] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0031] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0032] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "equipped with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0033] In related technologies, traditional spread foundations are relatively large in size, require a large amount of masonry, and have a high self-weight. The base stress caused by their self-weight accounts for a large proportion of the total base stress. Taking the construction of an arch bridge with a main span of 580m (calculated span) under geological conditions of moderately weathered sandy mudstone with a foundation bearing capacity of 1000KPa as an example, if the traditional spread foundation scheme is adopted, the size of the arch abutment will be large, and the preliminary calculation shows that at least 25,000 cubic meters of concrete will be needed. 3 Furthermore, the excavation volume of the arch abutment is very large, resulting in a significant environmental impact. The base stress caused by its own weight accounts for more than 50% of the total dead load base stress. Therefore, the technical solution of this application was developed, which is described below in conjunction with… Figures 1 to 3 To elaborate.

[0034] Example 1

[0035] like Figures 1 to 3 As shown, the present invention discloses a novel frame-type enlarged foundation arch seat structure for a truss arch bridge, comprising an enlarged foundation 1, frame columns 2, transverse beams 4, and longitudinal beams 5. This arch seat structure is applicable to steel pipe arches, steel truss arches, etc.

[0036] like Figure 1 and Figure 2 As shown, the frame column 2 is provided with a corresponding chord 3. The chord 3 extends into the frame column 2 and is fixed to the frame column 2, thus transferring the arch load to the frame column 2.

[0037] like Figure 1 and Figure 3 As shown, two adjacent frame columns 2 are connected by the transverse beams 4, as follows. Figures 1 to 3 As shown, two adjacent frame columns 2 are connected by the longitudinal beams 5; the transverse beams 4 and the longitudinal beams 5 are fixed to the frame columns 2 near the top of the frame columns 2 to form a frame structure. The transverse beams 4 and the longitudinal beams 5 are located in the same plane, which increases the structural stiffness and stability.

[0038] like Figure 1 and Figure 2 As shown, the frame columns 2 are arranged in an array on the enlarged foundation 1, and the bottom of the frame columns 2 is fixed to the enlarged foundation 1 to transfer the load to the enlarged foundation 1; finally, the enlarged foundation 1 transfers the load to the foundation, and the transfer path is clear and reasonable.

[0039] In some alternative embodiments, in order to ensure that the base of the enlarged foundation 1 is subjected to uniform stress, the distance from the frame column 2 to the edge of the enlarged foundation 1 is less than or equal to the thickness of the enlarged foundation 1.

[0040] In some alternative embodiments, the frame column 2 is a variable cross-section column, wherein the cross-sectional dimension of the frame column 2 on the side closer to the enlarged foundation 1 is larger than the cross-sectional dimension of the frame column 2 on the side farther away from the enlarged foundation 1.

[0041] As an example, such as Figures 1 to 3 As shown, the frame column 2 includes a variable cross-section column and a constant cross-section column. The constant cross-section column is connected to the variable cross-section column, and the variable cross-section column is connected to the enlarged foundation 1. The cross-sectional dimension of the variable cross-section column on the side closer to the enlarged foundation 1 is larger than the cross-sectional dimension of the variable cross-section column on the side closer to the constant cross-section column. The constant cross-section column adopts a prism structure or a cylindrical structure. The transverse beam 4 and the longitudinal beam 5 are both connected to the side wall of the constant cross-section column. The variable cross-section column adopts a frustum structure or a frustum structure.

[0042] In this embodiment, the frame column 2 includes four columns, which are located at the four vertices of the rectangle on the enlarged foundation 1. The lower part of the frame column 2 is a regular square frustum and the upper part is a regular square prism. The horizontal beam 4 and the vertical beam 5 are rectangular columns, and the ends of the rectangular columns are fixedly connected to the top sidewall of the regular square prism.

[0043] The entire arch abutment significantly reduces the stress area compared to traditional enlarged foundation arch abutments, greatly saving on the amount of work. At the same time, the arch abutment can still be constructed using the convenient and quick open-cut method. The construction technology is mature, the operation is simple, the safety risks are low, and the construction period is short and the economy is good.

[0044] The implementation scheme for the arch seat structure adopts the open excavation method, which is relatively mature. A temporary excavation slope can be used within the height range of the enlarged foundation 1, while a permanent excavation slope is used above the foundation height. The foundation is not backfilled after excavation to reduce the weight of the arch seat.

[0045] S1. Clean the foundation surface, install surface drainage facilities, excavate on a slope to the bottom of the enlarged foundation 1, and carry out slope protection within a certain range of the foundation.

[0046] S2. After the slope is excavated to the base elevation, it should be sealed in time, and the time interval between pouring the arch seat concrete should be shortened. Before pouring the concrete for the arch seat foundation, loose rock blocks should be carefully removed, and cavities should be backfilled with concrete. If there are cracks on the bedrock surface, they should be sealed with grout first.

[0047] S3. Install positioning brackets, tie reinforcing bars, and pour the enlarged foundation 1, the frame column 2 and the longitudinal and transverse tie beams in sequence. When pouring the concrete of the enlarged foundation 1, it can be poured in layers to reduce the heat of hydration. When pouring concrete for each part, attention should be paid to pre-embedding the pre-embedded parts of the connecting components.

[0048] S4, Construction of the main arch ring.

[0049] This embodiment describes a novel frame-type enlarged foundation arch abutment structure for a truss arch bridge. Utilizing the design concept of "enlarged foundation 1 + frame structure," the frame structure is formed by the frame columns 2, the transverse beams 4, and the longitudinal beams 5. The frame columns 2 serve as the force transmission path for the chord members 3, while the transverse beams 4 and longitudinal beams 5 increase structural stiffness and stability. By deducting the concrete along the main force transmission path of the non-chord members 3, the self-weight of the arch abutment is reduced, as is the amount of masonry work. The proportion of base stress caused by the self-weight of the arch abutment to the total base stress decreases significantly. Simultaneously, it exhibits minimal environmental damage, a clear load transfer path, and a simple and rational foundation stress distribution. Under the same geological conditions, compared to a solid enlarged foundation arch abutment, this arch abutment structure is lighter, requires less masonry work, has less environmental damage, is easier to construct, and is more economical.

[0050] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A new frame type enlarged foundation abutment construction of a truss arch bridge, characterized in that, include: Expanding the foundation (1); A frame column (2) is connected to the enlarged foundation (1), and the frame column (2) is set with a corresponding chord (3), which extends into the frame column (2); A transverse beam (4) is used to connect two adjacent frame columns (2) laterally. The longitudinal beam (5) connects two adjacent frame columns (2) in the longitudinal direction.

2. The new framed enlarged foundation abutment construction of a trussed arch bridge according to claim 1, characterized in that, The frame column (2) is a variable cross-section column, and the cross-sectional dimension of the frame column (2) on the side closer to the enlarged foundation (1) is larger than the cross-sectional dimension of the frame column (2) on the side farther away from the enlarged foundation (1).

3. The new framed enlarged foundation abutment construction of a trussed arch bridge according to claim 1, characterized in that, The frame column (2) includes a variable cross-section column and a constant cross-section column. The constant cross-section column is connected to the variable cross-section column, and the variable cross-section column is connected to the enlarged foundation (1). The cross-sectional dimension of the variable cross-section column on the side closer to the enlarged foundation (1) is larger than the cross-sectional dimension of the variable cross-section column on the side closer to the constant cross-section column.

4. The new framed enlarged foundation abutment construction of a trussed arch bridge according to claim 3, characterized in that, The constant cross-section column adopts a prism structure or a cylindrical structure.

5. The new framed enlarged foundation abutment construction of trussed arch bridge as claimed in claim 3 wherein, Both the transverse beam (4) and the longitudinal beam (5) are connected to the side wall of the column with uniform cross-section.

6. The new framed enlarged foundation abutment construction of a trussed arch bridge according to claim 5, characterized in that, The transverse beam (4) and the longitudinal beam (5) are located in the same plane.

7. The new framed enlarged foundation abutment construction of a trussed arch bridge according to any one of claims 2-6, characterized in that, The variable cross-section column adopts a frustum structure or a truncated cone structure.

8. The new framed enlarged foundation abutment construction of trussed arch bridge as claimed in claim 1 wherein, The distance from the frame column (2) to the edge of the enlarged foundation (1) is less than or equal to the thickness of the enlarged foundation (1).

9. The new framed enlarged foundation abutment construction of trussed arch bridge as claimed in claim 1 wherein, The frame columns (2) are arranged in an array on the enlarged foundation (1).

10. The new framed enlarged foundation abutment construction of a trussed arch bridge according to claim 9, characterized in that, The frame columns (2) comprise four, and the frame columns (2) are positioned at the four vertices of the rectangle on the enlarged foundation (1).

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