Method for plugging relief well of deep foundation pit

A technology for pressure relief wells and foundation pits, which is applied in infrastructure engineering, construction, etc., can solve the problems of high water pressure in foundation pits, difficulty in sealing pressure relief wells, and large water volume, etc., and achieves good sealing quality, The effect of reducing construction costs

Active Publication Date: 2014-01-22
THE THIRD CONSTR OF CHINA CONSTR EIGHTH ENG BUREAU
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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) Two ring-shaped water-stop steel plates are welded on the outer wall of the steel pipe. The welds must be full and there must be no gaps. The two ring-shaped water-stop steel plates are respectiv...

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Abstract

The invention discloses a method for plugging a relief well of a deep foundation pit. The method comprises the following steps of (1) necessary preparation before relief well plugging; (2) plugging construction on the relief well, wherein after base plate construction is completed, a body structure meets anti-floating requirements, and a fixed water level in a relief well in the foundation pit is located 2-3m below a foundation pit face, the plugging construction on the relief well can be carried out, the relief well in a working state is firstly plugged in an interval mode due to a large water yield, after the relief well is partially plugged, the working state of the relief well which is not plugged continues to be observed and comprises the water yield condition, the variation value of the water level, the fixed water level elevation and the water pump position elevation, the rest of the relief well continues to be plugged in an interval mode, and time is earned for well plugging by increasing pump output. The method has the advantages that the relief well can be successfully plugged when underwater pressure or water inflow is large, plugging quality is good, construction cost is lowered, and the method is worthy of popularization and 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 Applications(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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