Plugging structure for large-drawdown pipe well and construction method thereof

Abstract

The invention relates to a plugging structure for a large-drawdown pipe well and a construction method thereof, and belongs to the field of building construction. The plugging structure for the large-drawdown pipe well comprises a no-sand cement pipe and a steel casing pipe. A steel plate water stop ring is welded to the steel casing pipe. The portion, located on the bottom elevation portion of an under layer, of the steel casing pipe is connected with a slip-preventing water stop ring in a welded mode. A water stop steel plate with a screw thread steel pipe and the steel casing pipe are welded for stopping water. An end cap with screw threads and threads of the water stop steel plate with the screw thread steel pipe are connected and sealed in a threaded mode. A thickened water stop plugging steel plate is welded to the top of the steel casing pipe. Expansive imperious concrete is poured in the portion between the water stop steel plate and the plugging steel plate of the steel casing pipe. Expansive water stop strips winding around the steel casing pipe are arranged on the connecting portion of the no-sand cement pipe and the steel casing pipe. The invention further discloses a construction method of the plugging structure for the large-drawdown pipe well. Operation is easy to carry out, and the construction period is shortened; as measures of adopting a plurality of waterproof structures are taken, the waterproof effect of a concrete bottom plate can be ensured, and more economic benefits and social benefits can be achieved.

Description

technical field [0001] The invention relates to a large drawdown tube well plugging structure and a construction method thereof, belonging to the field of building construction. technical background [0002] With the economic development of our country, high-rise buildings are becoming more and more popular. With the birth of high-rise buildings, the construction of deep foundation pits has become a normal trend. One of the difficulties in the construction of deep foundation pits is to solve the problem of groundwater. The method of tube well dewatering is adopted. It is simple, economical and applicable, and has been applied in many projects; however, in the process of deep foundation pit construction, due to the large depth of precipitation and the large diameter of the downcomer well, water gushing will occur at the wellhead during the well closure process, so how to effectively and quickly Blocking the precipitation wells with deeper precipitation depth and larger diamet...

AI Technical Summary

Problems solved by technology

[0003] In view of the above problems, the purpose of the present invention is to provide a large drawdown tube well plugging structure and construction method thereof, to solve the problem of effectively plugging the dewatering well and ensuring the waterproof effect of the concrete floor while achieving greater economic benefits and social benefits. benefit technical issues

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