Quick sealing method and device for sandless cement pipe deep well dewatering wellhead

Abstract

The invention discloses a quick sealing method and a device for a sandless cement pipe deep well dewatering wellhead. A prefabricated steel sleeve is inserted into a sandless cement pipe; at least one water stop plate is arranged on an outer side wall of the steel sleeve; materials such as polyurethane sealants and SBS (styrene-butadiene-styrene) waterproof coiled materials are adopted among the steel sleeve, the sandless cement pipe and a foundation concrete cushion for comprehensive water resistance; hard concrete is poured into the steel sleeve; and the upper part of the steel sleeve is connected by a sealing plate, a waterproof rubber mat and a flange for once quick sealing, so that the problem of water seepage inside and outside a pipe well after being sealed is avoided.

Description

technical field [0001] The invention relates to the technical field of plugging of dewatering wells, in particular to a method and a device for quickly plugging the head of a dewatering well with a sand-free cement pipe. Background technique [0002] During the excavation of deep foundation pit dewatering wells in basements of high-rise buildings, underground garages and civil air defense projects, due to the penetration of groundwater in the soil, quicksand and springs often occur, and the soil at the bottom of the pit will continue to flow with the excavation. If the upwelling occurs, the slope will continue to collapse, which will not only affect the excavation construction of the earthwork, but also affect the safety of adjacent buildings, structures and foundation pit support structures, as well as the normal construction and construction of the foundation of the building. Engineering Quality. [0003] At present, deep foundation pit dewatering wells usually use sand-f...

AI Technical Summary

Problems solved by technology

[0004] When the current deep foundation pit dewatering well has a large area, due to the limitation of the depth of precipitation and the radius of influence of precipitation, the deep foundation pit dewatering well must be buried in the foundation pit, but at this time, the plugging of the wellhead has become a problem. The monopoly sealing method is often prone to leakage during the sealing process or after the sealing. The treatment is time-consuming and labor-intensive, and the sealing is not complete. Moreover, the conventional sealing method will cause cross-operation of types of work, which will affect The construction period and construction cost are high, and the sealing is more difficult, and it is difficult to guarantee the quality and effect of the sealing

Images