A construction method for shaft excavation

Abstract

The invention provides a shaft excavation construction method which comprises the following steps: construction of an enclosure retention wall; shallow layer excavation of a shaft; water injection in the shaft with the shallow layer excavation completed, and underwater excavation of the rest part of the shaft in water; pouring of a base plate of the shaft, and construction of an lining wall of the shaft by virtue of the buoyancy of water in the shaft; pouring of a clearance between the lining wall and the enclosure retention wall. According to the construction method, the structure of the steel-concrete combined base plate is adopted, thereby solving the problem of joint load carrying of the base plate and a support structure of the supper-deep shaft and improving the anti-floating capacity of the base plate; meanwhile, the construction is carried out in combination with lifting equipment by virtue of the buoyancy of water, thereby improving the construction efficiency and realizing reliable quality; next, non-drainage excavation is adopted, thereby solving the problem of confined water drawdown required in the foundation pit excavation process, shortening the construction depth of the enclosure retention wall and reducing the construction risk.

Description

technical field [0001] The invention belongs to the technical field of foundation pit engineering construction, is suitable for ultra-deep shaft engineering construction, and mainly relates to a shaft excavation construction method. Background technique [0002] At present, there are many problems in the construction of ultra-deep shaft structures, among which the problem of deep groundwater treatment needs to be solved urgently. If dewatering measures are adopted, it will inevitably have an impact on the surrounding environment of the shaft, especially in the central area of ​​the city where dewatering foundation pits are excavated, and the construction risk of reducing deep confined water is high. The conventional measures are to use dewatering wells, water barrier curtains and recharge simultaneously method, but for the construction of extra-deep and large-diameter shaft structures, the amount of precipitation is large, and the impact on the surrounding environment is mor...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a shaft excavation construction method to solve the impact of groundwater during the shaft construction process, and to solve the problems of anti-floating of the bottom plate of the shaft and the construction of the shaft structure

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