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Method for plugging relief well of deep foundation pit

A technology for relief wells and foundation pits, which is applied in infrastructure engineering, construction, etc., can solve problems such as the difficulty of blocking relief wells, high water pressure and large water volume in foundation pits, and reduce construction costs and seal Good blocking effect

Active Publication Date: 2015-06-03
THE THIRD CONSTR OF CHINA CONSTR EIGHTH ENG BUREAU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is even more difficult to seal off the relief well of this type of foundation pit. This type of foundation pit has a large water pressure and a large amount of water. Once the pumping is stopped, the water level will rise sharply. Whether the well closure is successful or not, time is particularly important.

Method used

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  • Method for plugging relief well of deep foundation pit

Examples

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Embodiment 1

[0033] Example 1: A method for plugging a relief well of a foundation pit, comprising the steps of:

[0034] (1) Necessary preparations before closure of relief wells, including the following procedures:

[0035] (1-1) After pouring the cushion in the foundation pit, cut off the concrete filter pipe in the relief well to the elevation of the upper surface of the cushion;

[0036] (1-2) Clean up the dust on the inner wall of the concrete filter pipe in the decompression well;

[0037] (1-3) Insert the hemp silk oiling paste wrapped around the outer wall of the lower end of a steel pipe into the concrete water filter pipe, and then fill the hemp silk oiling paste around the steel pipe and the concrete water filter pipe of the decompression well until the seal is tight;

[0038] (1-4) Weld two ring-shaped water-stop steel plates on the outer wall of the steel pipe. The welds should be full without gaps. The two ring-shaped water-stop steel plates are respectively located in th...

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Abstract

The invention discloses a method for plugging a relief well of a foundation pit, which comprises the following steps: (1) necessary preparations before the plugging of the relief well; Relief requirements, and the stable water level in the relief well in the foundation pit is 2 to 3 meters below the foundation pit surface, and the relief well plugging construction can be carried out. Due to the large amount of water, firstly, the relief wells in the working state are blocked at intervals; After the relief well is partially blocked, continue to observe the working status of the unplugged relief well, including the water output, water level change value, stable water level elevation, and water pump position elevation; again, the remaining relief wells are separated Plugging, and increasing the water pumping will win time for well sealing; (1) the invention can successfully plug the decompression well when the groundwater pressure or water inflow is large; (2) the plugging quality is good, and the construction cost is reduced. It is worth promoting the application.

Description

technical field [0001] The invention relates to a plugging method for a relief well of a foundation pit, and belongs to the technical field of geotechnical engineering construction. Background technique [0002] With the unprecedented development of geotechnical engineering in my country, the number of foundation pit projects in my country is increasing, and the scale is also increasing. The depth of foundation pits is also deepening, and the complex underground geological conditions make the precipitation of foundation pits scientific and rapid. Rise. At present, there are many large-scale and deep foundation pits in our country. After the earthwork of such foundation pits is excavated, the overburden layer above the confined water level will drop sharply, and the phenomenon of foundation pit surges will easily occur. Decompression wells are used to pump water. It is an effective method to ensure the anti-surge stability of the foundation pit floor. However, the plugging o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D19/10
Inventor 全有维王成荟程建军王文晋石磊包扬
Owner THE THIRD CONSTR OF CHINA CONSTR EIGHTH ENG BUREAU
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