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Method for supporting foundation pit

A foundation pit support and foundation pit technology, which is applied in the field of geotechnical engineering, can solve the problems of difficult construction of the main structure, high cost, and difficulty in earthwork excavation, so as to improve the work efficiency of earthwork excavation, increase the horizontal resistance, and reduce the waterproof construction. effect of difficulty

Active Publication Date: 2018-05-15
ANHUI URBAN CONSTR DESIGN & RES INST
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Problems solved by technology

[0007] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a method for foundation pit support to solve technical problems such as difficult construction of the main structure, high cost, and difficulty in earthwork excavation in the prior art.

Method used

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no. 2 example

[0055] The main structure to be built in the foundation pit in this example is the first floor underground, the excavation depth of the foundation pit is 6m, and the plane span is 150m. The surrounding environment is complex, and the deformation control of the foundation pit is strictly required. The internal support adopts the diagonal support in the pit.

[0056] The enclosure structure 1 is specifically composed of a plurality of rows of piles, see figure 2 . The row of piles adopts 900mm diameter bored piles, the piles are 12m long, and form columns at a certain distance. The pile foundation of the main structure adopts 800mm diameter bored piles, and the pile top elevation is 100mm above the bottom of the proposed basement floor structure. The buttress pile column 2 is specifically composed of multiple buttress piles in a row. The buttress piles are 900mm diameter bored piles. The pile top elevation is 200mm below the bottom of the basement floor cushion to be built. T...

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Abstract

The invention discloses a method for supporting a foundation pit, and relates to the technical field of geotechnical engineering. The method includes steps of firstly, constructing a space enclosing structure, a pier pile supporting row and a pile base line at the design position simultaneously; then constructing a crown beam at the top part of the space enclosing structure, and then excavating earthwork in the foundation pit until the top part of the pier pile supporting row is exposed; constructing a strip-shaped supporting base at the top part of the pier pile supporting row; constructing apurlin on the space enclosing structure beneath the brown beam, and erecting a supporting arm between the strip-shaped supporting base and the purlin; then excavating the earthwork at the edge of thefoundation pit to the bottom part of the foundation pit by a reversed basin shaped excavation method; constructing a side span bottom plate at the top part of the pile base row, and then constructinga diagonal arm between the strip-shaped supporting base and the side span bottom plate so that the strip-shaped supporting base and the side span bottom plate are effectively connected. The method has the advantages of effectively reducing the main body construction difficulty, improving the construction efficiency, facilitating the earthwork excavation of the foundation pit, and effectively reducing the construction cost.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to a method for foundation pit support. Background technique [0002] At present, the internal supporting structure of foundation pit support used in China is mainly horizontal support and diagonal brace in the pit. For foundation pits with large plane size and shallow depth, diagonal braces in the pit are mostly used, and the materials of the diagonal braces are mostly steel pipes or combined steel. Reliable support reaction force, the diagonal support is set at the bottom of the foundation pit, and the pile foundation is used or the basement floor constructed in the middle is used in advance. The foundation pit earthwork of the existing diagonal brace technology adopts the "pot type" excavation method. The earthwork in the middle is excavated first, and the edge earthwork is excavated to the bottom of the diagonal brace for slope grading. After the diagonal brace ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/04E02D17/02
CPCE02D17/02E02D17/04
Inventor 蔡敏束冬青李彪孟玉孟凡军吴东彪周阳刘少凯刘贵强赵贵生单灿灿张龙飞孙昌兴
Owner ANHUI URBAN CONSTR DESIGN & RES INST
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