Double-layer steel sheet pile combined enclosure structure and construction method thereof

Abstract

The invention discloses a double-layer steel sheet pile combined enclosure structure and a construction method thereof, relates to the technical field of geotechnical engineering design and construction, and solves the problems of enclosure deformation increase, leakage instability and other risks caused by insufficient pile body rigidity of an existing steel plate pile. The double-layer steel sheet pile combined enclosure structure comprises double layers of steel sheet piles which are arranged on the periphery of a foundation pit and are tightly attached to the axes in the width direction ofthe double layers of steel sheet piles and are arranged parallelly or symmetrically, and a combined reinforcing layer which is formed by grouting and reinforcing soil between the double layers of steel sheet piles. The construction method comprises: the outer-layer steel sheet piles and the inner-layer steel sheet piles are inserted into the periphery of the foundation pit in sequence, and then asoil body between the inner-layer steel sheet piles and the outer-layer steel sheet piles is grouted and reinforced to form the combined enclosure structure; then a foundation pit soil body is excavated in sequence, all horizontal supports are constructed until reaching the pit bottom, an underground structure is constructed, support replacing components are arranged according to design requirements, and all the horizontal supports are dismantled; underground structure construction is completed, the soil body is backfilled to the natural floor elevation, the double layers of steel sheet pilesare pulled out, and pile pulling gaps are grouted and filled.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering design and construction, in particular to a double-layer steel sheet pile composite enclosure structure and a construction method thereof. Background technique [0002] In recent years, with the continuous development and improvement of my country's urban construction, the scale of municipal infrastructure has continued to increase. As an important part of municipal infrastructure, urban pipeline (ditch) projects have also continued to expand in scale, presenting a "long, deep , big" trend. Pipeline (ditch) projects are generally concentrated in the central area of ​​the city, and the surrounding roads, pipelines, rail transit, expressways and other ground and underground facilities are dense, the environment is sensitive and complex, and the available construction space is tight and harsh. Moreover, in order to avoid affecting road traffic, The construction period requirements of...

AI Technical Summary

Problems solved by technology

[0004] When the existing steel sheet piles are used in the foundation pit support of deep underground projects, due to the insufficient rigidity of the pile body, the deformation of the enclosure increases, and there are risks such as leakage and instability.

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