Supporting structure and supporting method of foundation pit

Abstract

The invention discloses a supporting structure and a supporting method of a foundation pit. The supporting method comprises the following steps of: measuring a boundary line of a to-be-excavated foundation pit according to a design drawing; inserting a steel sheet pile and a steel upright respectively into the periphery and the middle part of the to-be-excavated foundation pit; excavating the foundation pit in layering; then connecting a cross support of a horizontal steel tube in layering, wherein the cross support of the horizontal steel tube and the upright are welded fixedly; filling the pit fully by a concrete soil stirring machine and reinforcing so as to form the reinforcing area of the bottom of the foundation pit after the bottom of the foundation pit is excavated; and setting up a concrete soil stirring pile by clinging to the root part of the steel sheet pile until solidifying fully. According to the invention, the phenomena of displacement and slump of the supporting structure at the bottom of the foundation pit can be prevented effectively.

Description

technical field [0001] The invention relates to the formation of foundations in the construction field, in particular to a foundation pit support structure and a support method thereof. Background technique [0002] At present, in the construction of houses and subway stations, the engineering of foundation pit treatment is involved, especially the support of deep foundation pit engineering in soft soil areas. The main methods usually adopted are bored piles, steel sheet piles, underground diaphragm walls, Pile anchors and other structures, these supporting structures have great rigidity, but the soil strength at the bottom of the foundation pit in soft soil areas is low. The passive zone cannot well restrain and fix the bottom of the support structure, resulting in a large displacement of the bottom of the support structure, which eventually leads to the foundation pit being prone to landslide damage. Contents of the invention [0003] The purpose of the present inventio...

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Problems solved by technology

[0002] At present, in the construction of houses and subway stations, the engineering of foundation pit treatment is involved, especially the support of deep foundation pit engineering in soft soil areas. The main methods usually adopted are bored piles, steel sheet piles, underground diaphragm walls, Pile anchors and other structures, these supporting structures have great rigidity, but the soil strength at the bottom of the foundation pit in soft soil areas is low. The passive area cannot well restrain the bottom of the support structure, which causes a large displacement of the bottom of the support structure, and eventually causes the foundation pit to be prone to landslide damage

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