Inner Curtain Mixing Well for Foundation Pit Dehydration-Depressurization and Its Working Method and Application

Abstract

The invention relates to an inner curtain type mixed well for foundation pit dewatering-depressurization and a working method and application. The mixed well comprises a drainage well, a lifting waterblocking assembly and an inflation compression assembly. The drainage well is provided with a water filtering pipe at the position of soil aquifer, and water-permeable holes are formed in the pipe wall of the water filtering pipe; the lifting water blocking assembly is provided with a water-blocking curtain which can be lifted and lowered in the drainage well, and a gap is formed between the water-blocking curtain and the inner wall in the drainage well; and the pneumatic compression assembly consists of an inflation membrane surrounding the outer surface of the water-blocking curtain and aninflation mechanism for inflating the inflatable membrane. Compared with the prior art, the inner curtain type mixed well is applied to a foundation pit dewatering project, and can freely control underground aquifer at different depths in dewatering-depressing drainage wells for drainage so that a precipitation well can be excavated to below the design depth of the foundation pit at one time, thearrangement of well points can be reduced, the construction period can be shortened, and the engineering cost can be saved.

Description

technical field [0001] The invention belongs to the technical fields of geological engineering and dewatering engineering, and in particular relates to an inner curtain type mixing well for foundation pit dewatering and depressurization, a working method and an application thereof. Background technique [0002] In foundation pit engineering, in order to meet the requirement that the groundwater level is lower than the excavation depth of the foundation pit, various dewatering methods are often used, such as open ditch method, hidden ditch method, well point method, etc. For some deep foundation pit projects with high groundwater level, the deep well point precipitation method with large displacement, large precipitation depth and large precipitation range is often selected. For multi-layered aquifers, there are often shallow unconfined aquifers and deep confined aquifers. In the past, the dewatering wells for dewatering in the precipitation and the depressurization wells fo...

AI Technical Summary

Problems solved by technology

In the past, the dewatering wells for dewatering in the precipitation and the decompression wells for depressurization were set separately, and there were too many wells in the foundation pit, which hindered the construction and made protection difficult

However, in the past, the mixing well was connected up and down, and the water was pumped when the depressurization stage was not needed. The environmental impact was great, and the pumping cycle was long, resulting in a waste of resources.

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