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Method for constructing basement foundation pit without horizontal braces

A technology of horizontal support and construction method, applied in basic structure engineering, excavation, construction, etc., can solve problems such as dissatisfaction and waste, and achieve the effect of saving costs and speeding up construction progress

Active Publication Date: 2014-11-05
CHINA CONSTR FOURTH ENG DIV
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  • Abstract
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Problems solved by technology

This approach causes a lot of waste and does not meet the current national thinking on energy conservation and emission reduction.

Method used

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  • Method for constructing basement foundation pit without horizontal braces

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Embodiment

[0016] Such as figure 1 As shown, the number 1-4 in the figure is the label of the soil layer below the ground, 1 is the miscellaneous soil filling layer, 2 is the silt layer, 3 is the medium sand layer, and 4 is the gravel sand layer. This example is applicable to the large excavation construction of super large foundation pits on the basement two floors and within two floors. The construction method is to adopt the secondary foundation pit support construction technology.

[0017] The first level is constructed according to the following steps:

[0018] 1. First use the single-axis cement mixing pile 5 to construct a circle of cement mixing piles along the edge of the basement to form a closed water-stop curtain; the depth of the cement mixing piles is as deep as the middle of the middle sand layer 2 below the ground;

[0019] 2. The inner side of the top of the cement mixing pile is anchored to the side wall of the foundation pit through an anchor pipe 6 inclined...

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Abstract

The invention discloses a method for constructing a basement foundation pit without horizontal braces. The method is used for constructing the basement foundation pit by the aid of a two-stage foundation pit supporting process and includes constructing a circle of closed cement mixing piles along the outer edge of a basement at a first stage and forming a closed waterproof curtain at the outer edge of the basement by the aid of the cement mixing piles; reducing the underground water level in the closed waterproof curtain by the aid of a dewatering well, excavating earth at a first phase and completely constructing prefabricated pipe columns; secondarily supporting the foundation pit by the aid of an SMW (soil mixing wall) construction process at a second stage, completely constructing the waterproof curtain, reducing water by the aid of the dewatering well and then excavating earth below the foundation pit. The method has the advantages that the inner horizontal braces of the foundation pit can be omitted on the premise that the requirement on the foundation pit supporting safety is met, accordingly, the construction cost can be saved, and the construction progress can be accelerated.

Description

technical field [0001] The invention relates to a construction method for a foundation pit without horizontal support in a basement, and belongs to the technical field of civil construction. Background technique [0002] With the continuous development of my country's construction industry, various building types are emerging, and there are more and more super-large foundation pit projects. In the normal construction of the basement of conventional projects, the construction of the pile foundation is carried out on the original ground of the foundation pit, and then the foundation pit is supported. Construction, earth excavation. This approach causes a lot of waste and does not satisfy the current thinking of the country on energy conservation and emission reduction. Contents of the invention [0003] The object of the present invention is to provide a construction method for a foundation pit without horizontal support in a basement. Under the premise of satisfying the saf...

Claims

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Application Information

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IPC IPC(8): E02D17/02E02D17/04E02D19/10E02D19/18
Inventor 苏伟安家伟陈逸宾
Owner CHINA CONSTR FOURTH ENG DIV
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