Continuous arch type foundation pit supporting method for long-strip-shaped deep foundation pit

Abstract

The invention discloses a continuous arch type foundation pit supporting method for a long-strip-shaped deep foundation pit. The continuous arch type foundation pit supporting method comprises the steps that support piles are arranged on the long side foundation pit side wall, the support piles are arranged and distributed continuously with a plurality of arch circular curves and a plurality of straight lines, the arch circular curves and the straight lines are distributed at intervals, and the circle centers of the arch circular curves are all in the foundation pit; and support piles are arranged on the short side foundation pit side wall and are arranged and distributed continuously with a straight line, surrounding purlins are arranged at the tops of the support piles and pile bodies, one-way horizontal opposite supports are arranged at arc arch feet of the long side foundation pit side wall, angle brace supports are arranged on the short side foundation pit side wall, the oppositesupports, the angle brace supports and the surrounding purlins jointly form an inner support system, uprights are arranged in the middles of the opposite supports and the angle brace supports, and inthis way a continuous closed deep foundation pit supporting structure system is formed. According to the continuous arch type supporting method, the characteristic of reasonable stress of a circular arch is fully utilized, stress of supporting of the support piles and the surrounding purlins is facilitated, meanwhile the span between the opposite supports of the long side foundation pit side wallis increased, the support area coverage rate of the foundation pit is reduced, and construction difficulty of underground engineering is lowered greatly.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to a multi-arch support method suitable for elongated foundation pits. For underground municipal projects such as long subway stations, underground comprehensive pipe corridors, and underground passages in soft soil areas with large excavation depths and shallow groundwater levels, its application advantages are more obvious. Background technique [0002] As the pace of urbanization accelerates, in dense urban centers where land resources are increasingly tight, underground space, as the main carrier of urban infrastructure, plays an increasingly important role in urban development. Traffic municipal facilities are dominant. As a result, a large number of strip-shaped deep foundation pit projects have emerged. Usually in the soft soil area where the groundwater level is shallow and the surrounding environment is tense, the support structure of the long strip deep ...

AI Technical Summary

Problems solved by technology

[0006] Purpose of the invention: the purpose of the present invention is exactly to provide a kind of continuous arch type support method that is used for elongated deep foundation pit in order to overcome the defective that above-mentioned prior art exists, to make full use of arch structure space effect and arch effect, Solve the technical problems of difficult foundation pit construction due to dense support spacing and optimize the internal force of the support structure

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