Profile steel outer arrangement and rear inserting type dual-row pile foundation pit supporting system and construction method thereof

Abstract

The invention provides a profile steel outer arrangement and rear inserting type dual-row pile foundation pit supporting system. The system comprises a crown beam, a supporting body composed of multiple supporting piles and a waterproof curtain composed of multiple stirring piles. Especially, the system comprises a waist beam and supporting columns. The waist beam is arranged on the side of the waterproof curtain and above the crown beam. The supporting columns are vertically arranged at the tops every other one to three supporting piles. The lower portions of the supporting columns are inserted into the crown beam and the supporting piles in a penetrating manner, a top seat connected with the waist beam is arranged at the top of each supporting column, transverse tie bars are welded to the upper ends of the supporting columns and connected to a waist beam steel bar or penetrate the waist beam to be planted in the stirring piles. A construction method of the foundation pit supporting system is provided. The construction method comprises the steps that firstly, after construction of the waterproof curtain, earth excavation is carried out for the first time; secondly, the supporting piles are constructed, and after concrete pouring of the supporting piles is completed, the supporting columns are constructed immediately; thirdly, the waist beam and the top seats of the supporting columns are constructed; and fourthly, the crown beam is constructed after earth excavation of the second time, and construction is completed. According to the system, the problem of the potential safety hazard that an overhanging part of the foundation pit supporting system is prone to suffering from lateral collapsing before earthwork backfilling is effectively avoided.

Description

technical field [0001] The invention relates to the technical field of building construction, in particular to a support system for foundation pits of buildings and a construction method for the support system. Background technique [0002] Before the earthwork excavation of the foundation pit of the building, in order to ensure the safety of the underground structure construction and the surrounding environment of the foundation pit, it is necessary to carry out the construction of the support system on the side wall of the foundation pit and its surrounding environment to play a role in supporting the foundation pit. , reinforcement and protection. Existing support systems usually include several columns and support beams. The columns are vertically arranged in the foundation pit, and the support beams are horizontally supported on the top of the foundation pit through the columns. The construction steps of this foundation pit support system are as follows: The Chinese pa...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to propose a support system for foundation pits of double-row piles inserted in the back of the outer row, which plays a good role in vertical and lateral support for foundation pits before earthwork excavation and backfilling of foundation pits, and The construction method of the foundation pit support system is proposed, which realizes the vertical excavation of the foundation pit earthwork, and effectively solves the problem that the overhanging part of the foundation pit support system is prone to lateral collapse before the earthwork is backfilled during the vertical excavation process of the foundation pit. Safety hazards

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