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Shaft excavation construction method

A construction method and shaft technology, which is applied in excavation, foundation structure engineering, construction, etc., can solve problems such as anti-floating and impact of shaft bottom plates, and achieve the effects of shortening construction depth, improving construction efficiency, and reliable quality

Active Publication Date: 2017-03-15
SHANGHAI MECHANIZED CONSTR GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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Embodiment Construction

[0042] The core idea of ​​this application is: in the construction process of the ultra-deep shaft structure, the construction method of not lowering the deep confined water is adopted, and at the same time relying on the buoyancy of the water and combining the lifting equipment to construct the lining wall of the shaft, the construction efficiency is improved, the quality is reliable, and the problem is solved. The water pressure inside and outside the foundation pit of the shaft is balanced, which has little impact on the surrounding environment of the shaft; secondly, fill in sections between the enclosure wall and the lining wall, and set up shear keys at local locations to solve the problem of common problems between the bottom plate of the ultra-deep shaft and the support structure. Stress problem.

[0043] The shaft excavation construction method proposed by the present invention will be further described in detail below in conjunction with the accompanying drawings and ...

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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...

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Application Information

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IPC IPC(8): E02D17/06E02D17/08
CPCE02D17/06E02D17/08E02D2250/0061E02D2250/0076E02D2300/0029
Inventor 吴欣之陈晓明杨宏伟严时汾过浩侃罗鑫贾宝荣蒋明星应晔吴晓风李晓娇刘颖李操周铮周蓉峰
Owner SHANGHAI MECHANIZED CONSTR GRP
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