CN114855811B - Three-row pile supporting structure and corresponding foundation pit construction method - Google Patents
Three-row pile supporting structure and corresponding foundation pit construction method Download PDFInfo
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- CN114855811B CN114855811B CN202210614953.1A CN202210614953A CN114855811B CN 114855811 B CN114855811 B CN 114855811B CN 202210614953 A CN202210614953 A CN 202210614953A CN 114855811 B CN114855811 B CN 114855811B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
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- General Engineering & Computer Science (AREA)
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Abstract
The invention discloses a three-row pile supporting structure and a corresponding foundation pit construction method, wherein the three-row pile supporting structure comprises shallow foundation pits adjacent to a building/structure and deep foundation pits positioned on the other side of the shallow foundation pit structure and communicated with the shallow foundation pit structure; a row of shallow foundation pit guard piles are arranged on one side of pit joint; a plurality of groups of pile foundations are arranged below the bottom plate of the shallow foundation pit along the length direction of the side wall; the top plate of the shallow foundation pit and the part of the bottom plate facing one side of the deep foundation pit are connected with the integrated bottom plate side wall of the deep foundation pit. During construction, firstly, a shallow foundation pit is constructed, then, the existing two rows of shallow foundation pit guard piles of the shallow foundation pit are utilized to form L-shaped three rows of piles of a high pile cap stress structure with the existing structure side wall, the base plate and the plurality of groups of pile foundations, and in the process of excavating the deep foundation pit to the bottom, the L-shaped three rows of piles of the high pile cap stress structure are adopted to bear lateral soil pressure. The invention uses the shallow foundation pit support as an important building protection barrier, and effectively reduces the interference of foundation pit excavation on important buildings and structures.
Description
Technical Field
The invention relates to the technical field of underground structure foundation pit construction, in particular to a three-row pile supporting structure and a corresponding foundation pit construction method.
Background
In a high-low span oversized foundation pit structure such as an underground garage, when the construction needs to be divided, the traditional method generally comprises the steps of firstly carrying out supporting excavation on a deep foundation pit structure, and then using the deep foundation pit as a supporting of a shallow foundation pit structure after the completion of the supporting excavation;
or the high-low span foundation pit is made into a large foundation pit, and a supporting structure is arranged in the deep foundation pit, namely, the supporting is carried out according to the pit-in-pit scheme.
However, if only one side around the foundation pit has important buildings, such as subways, railways, important pipelines, sensitive buildings and the like, and the shallow foundation pit is close to the buildings, the surrounding environment of the foundation pit with the three sides is relatively good, and the two traditional treatment schemes are shown in fig. 1 and 2, specifically:
scheme one: deep and shallow, and needs to be split into two foundation pits.
Scheme II: and constructing a foundation pit, and designing a deep pit according to the pit-in-pit design.
In practical application, when a deep foundation pit is excavated from the bottom of a shallow foundation pit to the bottom of the foundation pit, the lateral deformation of the supporting structure of the foundation pit cannot meet the requirements due to the transverse thrust of the foundation pit in the high and low cross-region, and the conventional method is to erect inclined throwing supports at the position, so that the structure of the foundation pit becomes complex, and the construction difficulty and the construction cost are increased.
Therefore, how to solve the defects of the prior art makes foundation pit construction faster, more efficient and more economical, and is a technical problem which needs to be solved by the technicians in the field.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present invention provides a three-row pile supporting structure and a corresponding foundation pit construction method, which aims to solve the shortcomings of the prior art, and make the foundation pit construction faster, more efficient and more economical.
In order to achieve the above purpose, the invention discloses a three-row pile supporting structure, which comprises a shallow foundation pit adjacent to a building/structure and a deep foundation pit positioned at the other side of the shallow foundation pit structure and communicated with the shallow foundation pit structure.
Wherein the shallow foundation pit faces to the outer side of the side wall of the building/structure, and a row of shallow foundation pit guard piles are arranged on one side which is jointed with the deep foundation pit;
a plurality of groups of pile foundations are arranged below the bottom plate of the shallow foundation pit along the length direction of the side wall;
and the top plate of the shallow foundation pit and the part of the bottom plate facing to one side of the deep foundation pit are connected with the integrated bottom plate side wall of the deep foundation pit.
Preferably, each pile foundation comprises more than 4 engineering piles which are arranged in a rectangular array.
Preferably, a plurality of support changing channels are arranged between the bottom plate and the side wall.
The invention also provides a foundation pit construction method applying the three-row pile supporting structure, which comprises the following steps:
step 1, preparing construction;
step 2, constructing two rows of shallow foundation pit guard piles of the shallow foundation pit and all pile foundations;
step 3, excavating soil of the shallow foundation pit;
step 4, the bottom plate, the top plate and the side walls of the shallow foundation pit are implemented;
step 5, excavating soil of the deep foundation pit;
and 6, constructing the integrated bottom plate side wall of the deep foundation pit.
Preferably, before the soil body of the deep foundation pit is excavated, a support replacing is constructed between the bottom plate and the side wall.
Preferably, the shallow foundation pit is constructed by adopting a bored pile and an internal support to support according to the open cut forward construction method.
The invention has the beneficial effects that:
the application of the invention makes the deep foundation pit not need to carry out an enclosure structure independently in the process of excavation, and the implementation of the shallow foundation pit makes the deep foundation pit and important constructions and structures form a natural barrier, thereby providing convenience for the enclosure structure type selection of the deep foundation pit, being capable of flexibly selecting, not needing the whole large foundation pit for supporting, only implementing the shallow foundation pit at the side of the important constructions and structures, and being more beneficial to deformation protection.
The conception, specific structure, and technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, features, and effects of the present invention.
Drawings
Fig. 1 shows a schematic structural diagram of an arrangement of the prior art.
Fig. 2 shows a schematic structural diagram of a second arrangement of the prior art.
Fig. 3 shows a schematic plan view of an embodiment of the present invention.
Fig. 4 shows a schematic cross-sectional structure in an embodiment of the invention.
Detailed Description
Examples
As shown in fig. 3 and 4, the three-row pile supporting structure comprises a shallow foundation pit adjacent to a building/structure and a deep foundation pit positioned on the other side of the shallow foundation pit structure and communicated with the shallow foundation pit structure.
Wherein, the shallow foundation pit faces to the outer side of the side wall 5 of the building/structure, and a row of shallow foundation pit guard piles 1 are arranged on one side which is jointed with the deep foundation pit;
a plurality of groups of pile foundations 3 are arranged below the bottom plate 2 of the shallow foundation pit along the length direction of the side wall 5;
the top plate 4 of the shallow foundation pit and the part of the bottom plate 2 facing the deep foundation pit are connected with the integrated bottom plate side wall 6 of the deep foundation pit.
According to the invention, the L-shaped three-row piles with a high pile cap stress structure are formed by using the existing two rows of shallow foundation pit guard piles 1 of the shallow foundation pit, the existing structure side walls 5, the bottom plate 2 and the plurality of groups of pile foundations 3;
in the process of excavating a deep foundation pit to the bottom, the L-shaped three-row piles adopting the stress structure of the similar high pile cap bear lateral soil pressure, and the generated bending moment is shared by the L-shaped three-row piles.
In some embodiments, each set of pile foundations 3 comprises more than 4 engineered piles arranged in a rectangular array.
In some embodiments, a plurality of braces 7 are provided between the bottom plate 2 and the side walls 5.
In practical application, after the deep foundation pit is excavated to the bottom elevation of the shallow foundation pit, the shallow foundation pit is in a unilateral stress state, so that the inclined throwing support is adopted for supporting, and the safety of the soil facing structure is ensured.
The invention also provides a foundation pit construction method applying the three-row pile supporting structure, which comprises the following steps:
step 1, preparing construction;
step 2, constructing two rows of shallow foundation pit guard piles 1 of a shallow foundation pit and all pile foundations 3;
step 3, excavating soil of a shallow foundation pit;
step 4, constructing a bottom plate 2, a top plate 4 and a side wall 5 of the shallow foundation pit;
step 5, excavating soil of the deep foundation pit;
and 6, constructing an integrated bottom plate side wall 6 of the deep foundation pit.
In some embodiments, a change strut 7 is constructed between the floor 2 and the side wall 5.
In some embodiments, shallow foundation pits are supported using bored piles and internal supports in an open cut forward construction.
In practical application, the shallow foundation pit is designed normally and conventionally, the deep foundation pit is constructed by slope releasing, the shallow foundation pit is adjacent to the side of the shallow foundation pit, only the shallow foundation pit is used for supporting, a supporting structure system is not arranged independently, the shallow foundation pit structure can be used as an important building protection barrier when the deep foundation pit is excavated, the shallow foundation pit and the deep foundation pit with a reserved safe implementation distance are excavated synchronously, the adjacent deep foundation pit can be excavated in sections after the shallow foundation pit is implemented, disturbance to a building can be effectively reduced, meanwhile, the construction speed of a large foundation pit can be accelerated, and only the small pit needs to adopt the supporting structure system of the guard pile and the inner support, so that the method is economical and the construction period is saved.
The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (6)
1. The three-row pile supporting structure comprises shallow foundation pits adjacent to a building/structure and deep foundation pits positioned on the other side of the shallow foundation pit structure and communicated with the shallow foundation pit structure; the method is characterized in that:
the shallow foundation pits are towards the outer side of the side wall (5) of the building/structure, and a row of shallow foundation pit guard piles (1) are arranged on one side which is jointed with the deep foundation pit;
a plurality of groups of pile foundations (3) are arranged below the bottom plate (2) of the shallow foundation pit along the length direction of the side wall (5);
the top plate (4) of the shallow foundation pit and the part of the bottom plate (2) facing one side of the deep foundation pit are respectively connected with the integrated bottom plate side wall (6) of the deep foundation pit.
2. A three-row pile supporting structure according to claim 1, characterized in that each set of pile foundations (3) comprises more than 4 engineering piles arranged in a rectangular array.
3. The three-row pile supporting structure according to claim 1, wherein a plurality of support changing devices (7) are arranged between the bottom plate (2) and the side wall (5).
4. The foundation pit construction method using the three-row pile supporting structure according to claim 1, comprising the steps of:
step 1, preparing construction;
step 2, constructing two rows of shallow foundation pit guard piles (1) of the shallow foundation pit and all pile foundations (3);
step 3, excavating soil of the shallow foundation pit;
step 4, the bottom plate (2), the top plate (4) and the side wall (5) of the shallow foundation pit are implemented;
step 5, excavating soil of the deep foundation pit;
and 6, constructing the integrated bottom plate side wall (6) of the deep foundation pit.
5. The foundation pit construction method according to claim 4, wherein a support change (7) is constructed between the bottom plate (2) and the side wall (5) before the soil body of the deep foundation pit is excavated.
6. The method for constructing a foundation pit according to claim 4, wherein the shallow foundation pit is constructed by adopting drilled piles and internal supports for supporting according to the open cut method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210614953.1A CN114855811B (en) | 2022-06-01 | 2022-06-01 | Three-row pile supporting structure and corresponding foundation pit construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210614953.1A CN114855811B (en) | 2022-06-01 | 2022-06-01 | Three-row pile supporting structure and corresponding foundation pit construction method |
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| Publication Number | Publication Date |
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| CN114855811A CN114855811A (en) | 2022-08-05 |
| CN114855811B true CN114855811B (en) | 2023-08-01 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117266172B (en) * | 2023-11-23 | 2024-02-27 | 北京建工集团有限责任公司 | Shallow-first-deep excavation method for adjacent foundation pit without coordination of construction progress |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1426495A2 (en) * | 2002-12-02 | 2004-06-09 | Tief- und Baugeräte GmbH & Co. KG | Method and device for the construction of a tunnel or a trench |
| CN104746520A (en) * | 2015-03-03 | 2015-07-01 | 南京市测绘勘察研究院有限公司 | Shallow-to-deep foundation pit supporting structure and method |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102031781A (en) * | 2009-09-24 | 2011-04-27 | 上海市第一建筑有限公司 | Foundation pit reinforcing technology from shallow position to deep position for group pit construction |
| CN104612160B (en) * | 2014-11-18 | 2016-03-30 | 中大建设有限公司 | A kind of next-door neighbour's existing building pit maintenance soil structure and construction method |
| CN209482312U (en) * | 2018-12-14 | 2019-10-11 | 山东大学 | A kind of Adjacent Pit successively excavates co-walled structural support system |
| CN214695636U (en) * | 2020-12-31 | 2021-11-12 | 北京中岩大地科技股份有限公司 | Novel foundation pit inclined pile supporting structure |
| CN112796333A (en) * | 2021-02-01 | 2021-05-14 | 上海市城市建设设计研究总院（集团）有限公司 | Multi-elevation deep foundation pit anchoring and pulling supporting structure and construction method thereof |
| CN215594046U (en) * | 2021-07-08 | 2022-01-21 | 中国建筑第八工程局有限公司 | Asynchronous construction roof of depth foundation ditch trades and props structure |
| AU2021103956A4 (en) * | 2021-07-08 | 2021-09-09 | Hongrun construction group company limited | Construction method for protecting overpass structure around deep foundation pits |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1426495A2 (en) * | 2002-12-02 | 2004-06-09 | Tief- und Baugeräte GmbH & Co. KG | Method and device for the construction of a tunnel or a trench |
| CN104746520A (en) * | 2015-03-03 | 2015-07-01 | 南京市测绘勘察研究院有限公司 | Shallow-to-deep foundation pit supporting structure and method |
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