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

A construction method and tube well technology, which are applied in basic structure engineering, earthwork drilling, sealing/isolation, etc., to achieve the effect of ensuring waterproof effect, large economic and social benefits, and simple operation.

Inactive Publication Date: 2014-08-20
CHINA CONSTR SECOND ENG BUREAU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

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

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Embodiment Construction

[0020] The specific implementation manners of the present invention will be described below in conjunction with the accompanying drawings.

[0021] A large drawdown tube well plugging structure, including cement-free sand pipe 1 and steel casing 2, the steel casing 2 is made of Q235B steel pipe with a wall thickness of 5mm and a diameter of 275mm, and the length of the steel casing is the length of the raft foundation and the pad The distance between the bottom elevations is increased by 300mm. The steel casing 2 is welded with a steel plate water stop ring 22. The steel plate water stop ring 22 adopts a 5mm thick and 50mm wide annular Q235 steel plate and is located in the middle of the raft foundation. The steel casing 2 at the bottom level of the cushion is welded and connected with an anti-slip waterstop ring 21, the width of the anti-slip waterstop ring 21 is 30mm, the position is at the level of the bottom of the cushion, and the height of the weld seam is not less than ...

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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...

Claims

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Application Information

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IPC IPC(8): E02D31/02E21B33/10
Inventor 刘治国邓振华董新军安凤杰方鹏郭强褚海伟刘云霁王蓉
Owner CHINA CONSTR SECOND ENG BUREAU LTD
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