Subway station construction method combining small-diameter jacking pipe with double-layer six-hole pile

Abstract

The invention discloses a subway station construction method combining a small-diameter jacking pipe with a double-layer six-hole pile. The subway station construction method comprises the following steps that after construction of an underground excavation section enclosure structure is completed, a small-diameter steel pipe is jacked, and then concrete is poured to form a pipe curtain structure; the construction of double-layer six pilot tunnels is carried out under the ground according to the principle of first bottom to top, L-shaped foundations are constructed in the pilot tunnels on the two sides of the lower layer, then manual hole digging piles are constructed through the pilot tunnels on the upper layer, longitudinal top beams are poured, and back backfilling is carried out; and a bottom longitudinal beam is constructed in a lower-layer middle pilot tunnel, then a top transverse pilot tunnel is constructed, excavation is carried out downwards from the top transverse pilot tunnel, steel pipe stand column piles are poured, then a top cross beam is constructed, then an upper-layer area is excavated, an upper-layer pilot tunnel supporting upper layer is broken, finally a lower-layer area is excavated, and a lower-layer pilot tunnel supporting lower layer is broken. The pipe curtain structure is combined with the top cross beam, the two sides are supported by the manual hole digging piles and the middle plates, effective supporting is formed, the structural stability is enhanced, ground subsidence can be controlled easily, the construction period is effectively shortened, and cost is saved.

Description

technical field [0001] The invention relates to the field of tunnel construction, in particular to a subway station construction method combining small-diameter pipe jacking with double-layer six-hole piles. Background technique [0002] With the rapid development of urban infrastructure, subway construction has gradually become the subject of urban public transportation planning. When the subway station needs to cross the traffic arterial road or pass through the existing structures, in order to reduce the impact of the construction, the underground excavation method is mostly used at present, and the pipe curtain construction method is a kind of underground excavation method, which can significantly reduce the surface settlement and realize shallow burial or Safe construction of underground structures under ultra-shallow buried conditions. However, since large-diameter steel pipes have high requirements for jacking thrust during the jacking process, and the ability to avo...

AI Technical Summary

Problems solved by technology

However, since large-diameter steel pipes have high requirements for jacking thrust during the jacking process, and the ability to avoid obstacles is poor, the steel pipes vertically arranged on both sides are affected by their own weight, making it difficult to effectively correct deviations and affect the precision of pipe jacking. resulting in excessively long

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