CN220377341U - Pile cap type large-diameter inclined single pile foundation arch base structure - Google Patents
Pile cap type large-diameter inclined single pile foundation arch base structure Download PDFInfo
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- CN220377341U CN220377341U CN202320392546.0U CN202320392546U CN220377341U CN 220377341 U CN220377341 U CN 220377341U CN 202320392546 U CN202320392546 U CN 202320392546U CN 220377341 U CN220377341 U CN 220377341U
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- 239000011435 rock Substances 0.000 claims abstract description 6
- 238000010276 construction Methods 0.000 abstract description 21
- 238000009412 basement excavation Methods 0.000 abstract description 8
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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Abstract
A pile cap type large-diameter inclined single pile foundation arch abutment structure is used for ensuring the construction safety of bridge foundations in areas with poor geology or high environmental protection requirements, greatly reducing the structural engineering quantity, reducing the maximum height of boundary piers and the foundation excavation quantity, reducing the influence of bridges on the environment and saving the engineering cost. The pile foundation is a large-diameter inclined single pile embedded in a rock body, the pile top of the pile is fixedly connected with the bearing platform, and the arch ring chord member and the juncture pier are fixedly connected with the bearing platform.
Description
Technical Field
The utility model relates to the technical field of bridge engineering, in particular to a large-scale inclined single pile foundation structure of a large-span arch bridge belt juncture pier bearing platform in a V-shaped valley with poor geology.
Background
In recent years, along with the rapid development of economy in China, the requirements on the transportation capacity are continuously increased, and the construction of roads and railways is correspondingly and comprehensively spread. Arch bridges are increasingly used for their esthetic appearance, high rigidity, and high spanning capacity. The bridge type is rapidly developed in the construction of expressway bridges in mountain areas in China. The maximum span of the arch bridge is continuously broken through, the maximum span of the built arch bridge in abroad (such as a new river valley bridge in the United states) is up to 518 meters, the maximum span of the built arch bridge in China is up to 575 meters (three bridges in Pinnan), and the span of the built arch bridge is up to 600 meters more than that of the built Tian Emeilong beach super bridge.
The arch bridge structure has great self weight, and the arch ring is mainly a bearing member, so that when no tie bar is arranged, the arch springing bears larger vertical force and larger horizontal force. Therefore, the arch bridge has higher requirement on the bearing capacity of the foundation, and the large-span arch bridge foundation with thrust usually adopts a large-scale enlarged foundation or a large-scale pile group foundation.
The large-scale enlarged foundation is generally constructed by adopting an open cut foundation method, has higher requirements on the bearing capacity of the foundation, is particularly suitable for arch base foundations with better geological conditions, and has larger size and very large excavation amount. The large pile group foundation is a pile foundation consisting of a plurality of piles, and the pile foundation has a large pile foundation number, so that the bearing platform of the pile group foundation has a large size, and in the V-shaped canyon, the excavation amount of the large pile group foundation is large in order to ensure the distance between pile foundation front edges and the embedded depth of the bearing platform.
In conclusion, the adoption of an enlarged foundation or a pile group foundation as an arch base foundation in a V-shaped valley with poor geology is uneconomical, the excavation amount is large, and the environmental damage is large. Therefore, it is necessary to create a new arch abutment foundation suitable for use in V-shaped valleys with poor geology, so as to solve the problems of large excavation amount, large masonry amount, long construction period, large influence on environment, etc. of the arch abutment foundation.
Disclosure of Invention
The utility model aims to solve the technical problem of providing a pile cap type large-diameter inclined single-pile foundation arch abutment structure so as to ensure the construction safety of bridge foundations in areas with poor geology or higher environmental protection requirements, greatly reduce the construction engineering quantity, reduce the maximum height of boundary piers and the foundation excavation quantity, reduce the influence of bridges on the environment and save the engineering cost.
The technical scheme adopted for solving the technical problems is as follows:
the utility model relates to a pile cap type large-diameter inclined single-pile foundation arch base structure, which comprises a pile foundation, a bearing platform, an arch ring chord member and a junction pier, and is characterized in that: the pile foundation is a large-diameter inclined single pile embedded in a rock mass, the pile top of the pile foundation is fixedly connected with the bearing platform, and the arch ring chord member, the junction pier and the bearing platform are fixedly connected.
The beneficial effects of the utility model are mainly shown in the following aspects:
1. the arch ring and the juncture pier are fixedly connected with the bearing platform, the load is transferred to the pile foundation through the bearing platform, and finally transferred to the foundation, and the transfer path is clear and reasonable;
2. during foundation construction, the excavation section is much smaller than that of a pile group foundation pile cap and an enlarged foundation, so that the influence on the environment and the construction risk are effectively reduced;
3. the construction method can refer to a tunnel construction method, and the process is relatively simple;
4. compared with the traditional arch base of the enlarged foundation or the large pile group foundation, the arch base greatly reduces the structural engineering quantity, reduces the maximum height of the boundary piers and is beneficial to saving the engineering cost.
Drawings
The specification includes the following six figures:
FIG. 1 is an elevational view of a pile cap type large diameter inclined single pile foundation abutment structure of the present utility model:
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;
FIG. 3 is a cross-sectional view taken along line B-B of FIG. 1;
FIG. 4 is a construction overview of a pile cap type large diameter inclined mono-pile foundation abutment construction of the present utility model;
fig. 5 is a construction pipe shed protection diagram of a pile cap type large-diameter inclined single pile foundation arch abutment structure according to the present utility model:
FIG. 6 is a cross-sectional view of a support of a pile cap type large diameter inclined mono-pile foundation abutment structure according to the present utility model:
the components and corresponding indicia are shown: pile foundation 10, pile bottom enlarged footing 11, transition section 12, pile top enlarged footing 13, plain concrete filling section 14, bearing platform 20, arch ring chord 30, boundary pier 40, pipe shed 50, support anchor 60.
Detailed Description
The utility model will be further described with reference to the drawings and examples.
Referring to fig. 1 to 3, the pile cap type large-diameter inclined single pile foundation arch abutment structure comprises a pile foundation 10, a bearing platform 20, an arch ring chord 30 and a boundary pier 40, wherein the pile foundation 10 is a large-diameter inclined single pile embedded in a rock body, and the excavation section is much smaller than that of a pile foundation bearing platform and an enlarged foundation, so that the construction risk and the influence on the environment are effectively reduced. Pile tops of pile foundations 10 are fixedly connected with the bearing platform 20, arch ring chords 30 and boundary piers 40 are fixedly connected with the bearing platform 20, bridge loads are transferred to the bearing platform 20 through the arch ring chords 30 and the boundary piers 40 and then transferred to the pile foundations 10, and finally transferred to a foundation, so that a transfer path is clear and reasonable. The abutment piers 40 are closer to the center of the arch ring and can reduce the maximum height of the upper arch column at a given superstructure span. Compared with the traditional arch base of the enlarged foundation or the large pile group foundation, the arch base greatly reduces the structural engineering quantity, reduces the maximum height of the boundary piers and is beneficial to saving the engineering cost.
The pile diameter of the pile foundation 10 is usually 1-3 m.
Referring to fig. 1, a pile top enlarging head 13 is provided at the intersection of the pile top and the pile cap 20 at the upper part of the pile foundation 10, so as to prevent the boundary pier 40 from punching and damaging the pile cap 20. A plain concrete fill section 14 is provided below the intersection of the pile top and the cap 20 to reduce stress concentrations at sharp corners. In order to fully utilize the bearing capacity of the pile end and shorten the pile length, the pile foundation 10 is provided with a pile bottom expansion head 11 at the lower part of the pile foundation, and an excessive section 12 is arranged between the pile bottom expansion head 11 and the pile foundation 10 main body.
Referring to fig. 4 to 6, a pile cap type large-diameter inclined single pile foundation arch abutment structure of the present utility model is constructed as follows:
s1, cleaning the surface of a foundation, excavating a slope to the bottom surface of a bearing platform 20, and protecting the slope in a certain range of a foundation;
s2: around the sleeve arch, a pipe shed 50 is constructed along the axial direction of the pile body, partial rock at the top of the foundation is excavated,
digging a tunnel along the axial line of the pile body with a uniform section, reaming the pile bottom, implanting small guide pipes or anchor rods 6 into the rock mass around the pile diameter in the construction process, and lining and supporting the foundation around the pile diameter;
s3: binding steel bars, pouring concrete, completing construction of the pile foundation 10, and after the pile foundation 10 is formed, post-pouring the pile top enlarged head 13, and paying attention to pre-burying the steel pipes and the steel bars of the pile bottom enlarged head 11 during construction of the end face of a foundation. Completing the construction of the pile foundation 10;
s4: a cap 20 is constructed and a plain concrete filled section 14 is poured at the intersection of the pile foundation 10 and the cap 20.
The section shape of the pile foundation 10 is similar to the section of a tunnel, the construction mode of the hole forming of the pile foundation 10 can adopt a tunnel construction method, and the process is mature.
The foregoing is illustrative of the principles of a pile cap type large diameter inclined single pile foundation abutment structure of the present utility model and is not intended to limit the utility model to the specific construction and application scope shown and described, but rather to limit the utility model to all corresponding modifications and equivalents which may be employed, as long as they are within the scope of the utility model as defined in the appended claims.
Claims (3)
1. The utility model provides a pile cap formula major diameter slope single pile foundation arch seat structure, includes pile foundation (10), cushion cap (20), bow ring chord member (30) and juncture mound (40), characterized by: pile foundation (10) is a large-diameter inclined single pile embedded in a rock mass, the pile top of the pile foundation is fixedly connected with a bearing platform (20), and arch ring chords (30) and junction piers (40) are fixedly connected with the bearing platform (20).
2. A pile cap type large diameter inclined mono-pile foundation abutment structure as defined in claim 1, wherein: pile top enlarging heads (13) are arranged at the intersections of pile tops and bearing platforms (20) on the upper portion of the pile foundation (10), and plain concrete filling sections (14) are arranged below the intersections of the pile tops and the bearing platforms (20).
3. A pile cap type large diameter inclined mono-pile foundation abutment structure as defined in claim 2, wherein: the pile foundation (10) is characterized in that a pile bottom expansion head (11) is arranged at the lower part of the pile foundation (10), and an excessive section (12) is arranged between the pile bottom expansion head (11) and the pile foundation (10) main body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320392546.0U CN220377341U (en) | 2023-10-23 | 2023-10-23 | Pile cap type large-diameter inclined single pile foundation arch base structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320392546.0U CN220377341U (en) | 2023-10-23 | 2023-10-23 | Pile cap type large-diameter inclined single pile foundation arch base structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220377341U true CN220377341U (en) | 2024-01-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320392546.0U Active CN220377341U (en) | 2023-10-23 | 2023-10-23 | Pile cap type large-diameter inclined single pile foundation arch base structure |
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| Country | Link |
|---|---|
| CN (1) | CN220377341U (en) |
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2023
- 2023-10-23 CN CN202320392546.0U patent/CN220377341U/en active Active
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