Construction method of well head closure for deep well dewatering in foundation pit of underground garage

Abstract

The invention relates to a well plugging construction method for a deep dewatering wellhead inside an underground garage foundation pit. The method includes the following steps that (1) a dewatering well is arranged in the middle part of the foundation pit; (2) a steel cylinder type waterstop ring is arranged before pouring of a cushion layer; (3) building stones are stuffed in until the stones submerge a pump by 40-50 cm, and water pumping continues; (4) waterproof concrete is poured till an inner waterstop ring on the steel cylinder type waterstop ring is 2 cm lower than an upper opening; (5) full-length welding is carried out around a steel sheet with the same inner diameter as the steel cylinder type waterstop ring, and a mortar levelling layer of 20 mm is obtained; (6) an additional layer is subject to waterproof closing, cushion layer concrete is poured, and a full-length waterproof layer is closed; and (7) foundation raft rebar is bound. The appropriate dewatering well is arranged in the middle part of the foundation pit so that the underground water level can be lowered efficiently, the construction progress is quickened, the construction period is shortened, and construction cost is greatly reduced. The waterproof and plugging construction method for the dewatering well inside the foundation pit is simple and convenient, professional training of operators is not required, and the work can be completed by common electric welders and waterproof workers.

Description

technical field [0001] The invention relates to the technical field of building construction. Background technique [0002] With the rapid development of urban construction and the increasing number of high-rise buildings, deep foundation pit construction will often be encountered, and the sealing of deep foundation pit dewatering wells is a key link in the entire foundation construction, which directly affects the quality of waterproofing projects in this part. In the construction of large-scale basements and underground garages, for foundation pits with large width and large underground water content, the width of the foundation pit is relatively large. While arranging deep well points around the foundation pit, it is also necessary to set precipitation in the middle of the foundation slab. well, but this brings certain difficulties and troubles to the plugging of the wellhead after the precipitation ends. Contents of the invention [0003] The technical problem to be s...

AI Technical Summary

Problems solved by technology

In the construction of large-scale basements and underground garages, for foundation pits with large width and large underground water content, the width of the foundation pit is relatively large. While arranging deep well points around the foundation pit, it is also necessary to set precipitation in the middle of the foundation slab. well, but this brings certain difficulties and troubles to the plugging of the wellhead after the precipitation ends

Images