Unsupported Construction Structure and Construction Method of Circular Deep Foundation Pit

Abstract

The invention discloses a supportless construction structure and a supportless construction method for a round deep base pit. The supportless construction method comprises the steps as follows: carrying out three-shaft stirring pile construction, cast-in-situ bored pile construction, earth mass grouting reinforcement, earth excavation, first enclosing purlin construction, subsequent earth excavation, next enclosing purlin construction, subsequent earth excavation and cushion layer and bottom plate construction so as to obtain a deep base pit bracing structure mainly comprising a circle of three-shaft stirring pile, a circle of cast-in-situ bored pile and a plurality of enclosing purlins. The bracing structure has no supporting structure; the arch effect of the earth mass is utilized; the earth pressure on the bracing structure is reduced; the external load is converted into the internal pressure on the enclosing purlins by the arch effect of the enclosing purlins at the same time; the characteristic of good pressure resistance of concrete is brought into full play; and as no supports are provided, the processes of dismounting and replacing the supports are removed, so that the maintenance expense of the base pit is reduced and the construction speed is quick.

Description

technical field [0001] The invention belongs to the field of building construction, and in particular relates to a construction structure and a construction method of a circular deep foundation pit. Background technique [0002] With the rapid development of China's economy and the acceleration of urbanization, land resources are becoming more and more tense. In order to make full use of land resources and alleviate the difficulties of urban land use, it has become inevitable for buildings to develop high-altitude and underground. In the process of development and utilization of underground space, Deep foundation pit engineering has become an unavoidable problem. Foundation pits are an important part of high-rise buildings and large-scale municipal projects. In the reconstruction of old cities, foundation pit engineering is often concentrated in the center of the city. The foundation pit project is a large-scale soil excavation project. The most direct consequence is the red...

AI Technical Summary

Problems solved by technology

Since the above-mentioned commonly used construction methods all use internal supports, and internal supports will affect the excavation speed in the foundation pit, and need to be replaced and removed, resulting in slow construction speed and waste of resources, resulting in high cost

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