CN209837012U - Cast-in-situ bored pile for prestressed foundation pit enclosure - Google Patents
Cast-in-situ bored pile for prestressed foundation pit enclosure Download PDFInfo
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- CN209837012U CN209837012U CN201822269666.3U CN201822269666U CN209837012U CN 209837012 U CN209837012 U CN 209837012U CN 201822269666 U CN201822269666 U CN 201822269666U CN 209837012 U CN209837012 U CN 209837012U
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- pile body
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- prestressed tendons
- foundation pit
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Abstract
A cast-in-situ pile for enclosing a prestressed foundation pit comprises a hollow cylindrical pile body, wherein a cavity which is communicated along the axial direction of the pile body is formed in the pile body, and reinforcing steel bars are arranged in the cavity; the reinforcement cage is tightly connected with the pile body; a plurality of prestressed tendons are arranged on one side, close to foundation pit excavation, of the pile body at intervals, the prestressed tendons extend along the axial direction of the pile body, and corrugated pipes are coaxially sleeved outside the prestressed tendons; the top ends of the prestressed tendons and the corrugated pipe are fixed on the top end face of the pile body through an anchorage device, the bottom ends of the prestressed tendons penetrate through the corrugated pipe, and the bottom ends of the prestressed tendons are fixed on the pile body through an anchoring section.
Description
Technical Field
The utility model belongs to the construction field, concretely relates to drilling bored concrete pile is enclosed to prestressing force foundation ditch.
Background
The cast-in-situ bored pile is a pile formed by forming a pile hole in foundation soil through mechanical drilling and the like on an engineering site, placing a reinforcement cage in the pile hole and pouring concrete into the pile hole. The application of the cast-in-situ bored pile in the foundation pit support design is very wide, however, the horizontal lateral stiffness of the cast-in-situ bored pile is much lower than that of a diaphragm wall, and the bending deformation in the foundation pit support is large. At present, a plurality of deep and large foundation pit constructions are close to the constructed subway tunnel, and the control requirement on the influence of the foundation pit excavation on the shield tunnel is very strict. Therefore, the pile diameter of the fender pile adopted in the foundation pit enclosure next to the subway tunnel is quite large, so that the construction of the cast-in-situ bored pile has great influence on the subway tunnel, and meanwhile, the pile diameter is increased, so that the cost is increased.
Chinese patent publication No. CN 105113486A discloses a cast-in-situ bored pile. The cross section of the cast-in-situ bored pile body is circular, and a regular polygonal reinforcement cage is arranged in the pile body. The reinforcement cage comprises a resistance facing reinforcement, a soil facing reinforcement and a constructional reinforcement. The reinforcement of the soil-facing surface is positioned on the soil-facing surface, the density of the reinforcement of the soil-facing surface is 2-3 times of that of the reinforcement of the soil-facing surface, and the horizontal impact resistance of the cast-in-situ bored pile is enhanced by increasing the density of the reinforcement of the soil-facing surface. However, the cast-in-situ bored pile needs to consume more reinforcing steel bar materials, the construction process is more complex, and the lateral stiffness of the pile body is insufficient.
Disclosure of Invention
In order to overcome the defect that the lateral stiffness of the cast-in-situ bored pile in the background art is not enough, the embodiment of the application provides the cast-in-situ bored pile for the prestressed foundation pit enclosure, wherein the horizontal lateral stiffness is increased by applying vertical prestress on the pile body, and the pile diameter is reduced at the same time.
The utility model adopts the technical proposal that:
the embodiment of the application provides a cast-in-situ bored pile for a prestressed foundation pit enclosure, which comprises a hollow cylindrical pile body, wherein a cavity which is communicated along the axial direction of the pile body is formed in the pile body, and reinforcing steel bars are arranged in the cavity; the reinforcement cage is tightly connected with the pile body;
a plurality of prestressed tendons are arranged on one side, close to foundation pit excavation, of the pile body at intervals, the prestressed tendons extend along the axial direction of the pile body, and corrugated pipes are coaxially sleeved outside the prestressed tendons;
the top ends of the prestressed tendons and the corrugated pipe are fixed on the top end face of the pile body through an anchorage device, the bottom ends of the prestressed tendons penetrate through the corrugated pipe, and the bottom ends of the prestressed tendons are fixed on the pile body through an anchoring section.
Further, the anchor is a clip type anchor or a support type anchor.
Further, the corrugated pipe is a metal corrugated pipe or a plastic corrugated pipe.
The beneficial effects of the utility model are embodied in:
the prestressed foundation pit retaining bored concrete pile of the utility model can effectively increase the lateral stiffness of the pile body through the prestress applied on the prestressed reinforcement on one hand, and reduce the deformation of the cast-in-place pile, thereby reducing the influence of foundation pit excavation on the surrounding environment and the surrounding existing buildings; on the other hand, when fender pile level anti side rigidity is the same, prestressing force drilling bored concrete pile's pile footpath littleer, more economy has fine market benefit.
Drawings
FIG. 1 is a top view of a pre-stressed foundation pit bracing bored concrete pile according to an embodiment;
fig. 2 is a front view of a pre-stressed foundation pit enclosure bored pile in one embodiment.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., appear based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" as appearing herein are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to the attached drawings 1-2, the embodiment provides a cast-in-situ bored pile for a prestressed foundation pit enclosure, which comprises a hollow cylindrical pile body 1, wherein a cavity which is through along the axial direction of the pile body 1 is formed in the pile body, and a reinforcement cage 6 is arranged in the cavity; the reinforcement cage 6 is tightly connected with the pile body 1;
a plurality of prestressed tendons 3 are arranged on one side, close to foundation pit excavation, of the pile body 1 at intervals, the prestressed tendons 2 extend along the axial direction of the pile body 1, and corrugated pipes 3 are coaxially sleeved outside the prestressed tendons 2;
specifically, the corrugated pipe 3 may isolate the prestressed reinforcement 3 from the concrete, so as to apply prestress to the prestressed reinforcement 3 at a later stage.
The top ends of the prestressed tendons 2 and the corrugated pipe 3 are fixed on the top end face of the pile body 1 through an anchorage device 4, the bottom ends of the prestressed tendons 2 penetrate through the corrugated pipe 3, and the bottom ends of the prestressed tendons 2 are fixed on the pile body 1 through an anchoring section 5.
Specifically, the anchorage device 4 is a clip type anchorage device or a support type anchorage device.
Specifically, the corrugated pipe 3 is a metal corrugated pipe or a plastic corrugated pipe.
On one hand, the utility model can effectively increase the lateral stiffness of the pile body through the prestress applied on the prestressed reinforcement 2, and reduce the deformation of the fender post, thereby reducing the influence of the excavation of the foundation pit on the surrounding environment and the surrounding existing buildings; on the other hand, when fender pile level anti side rigidity is the same, prestressing force drilling bored concrete pile's pile footpath littleer, more economy has fine market benefit.
The embodiments described in this specification are merely exemplary of implementations of the inventive concepts, and the scope of the invention should not be considered limited to the specific forms set forth in the embodiments, but rather the scope of the invention is intended to cover all technical equivalents that may be conceived by one skilled in the art based on the inventive concepts.
Claims (3)
1. The utility model provides a prestressing force foundation ditch enclosure drilling bored concrete pile which characterized in that: the pile comprises a hollow cylindrical pile body, wherein a cavity which is communicated along the axial direction of the pile body is formed in the pile body, and a reinforcement cage is arranged in the cavity; the reinforcement cage is tightly connected with the pile body;
a plurality of prestressed tendons are arranged on one side, close to foundation pit excavation, of the pile body at intervals, the prestressed tendons extend along the axial direction of the pile body, and corrugated pipes are coaxially sleeved outside the prestressed tendons;
the top ends of the prestressed tendons and the corrugated pipe are fixed on the top end face of the pile body through an anchorage device, the bottom ends of the prestressed tendons penetrate through the corrugated pipe, and the bottom ends of the prestressed tendons are fixed on the pile body through an anchoring section.
2. The cast-in-situ pile for the prestressed foundation pit support of claim 1, wherein: the anchorage device is a clamping piece type anchorage device or a supporting type anchorage device.
3. The cast-in-situ pile for the prestressed foundation pit support of claim 1, wherein: the corrugated pipe is a metal corrugated pipe or a plastic corrugated pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822269666.3U CN209837012U (en) | 2018-12-30 | 2018-12-30 | Cast-in-situ bored pile for prestressed foundation pit enclosure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822269666.3U CN209837012U (en) | 2018-12-30 | 2018-12-30 | Cast-in-situ bored pile for prestressed foundation pit enclosure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209837012U true CN209837012U (en) | 2019-12-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201822269666.3U Active CN209837012U (en) | 2018-12-30 | 2018-12-30 | Cast-in-situ bored pile for prestressed foundation pit enclosure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109706924A (en) * | 2018-12-30 | 2019-05-03 | 浙江工业大学 | A kind of prestressing force foundation pit enclosure cast-in-situ bored pile |
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2018
- 2018-12-30 CN CN201822269666.3U patent/CN209837012U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109706924A (en) * | 2018-12-30 | 2019-05-03 | 浙江工业大学 | A kind of prestressing force foundation pit enclosure cast-in-situ bored pile |
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