Double-layer film bag device and method for sealing grouting pipes in gushing sandy soil layers

Abstract

The invention discloses a double-layer film bag device applied to injection pipe sealing in a water bursting sand layer. The device comprises an injection screen pipe; the front part of the injection screen pipe is provided with a conical piercing end; opposite outer side faces of the back half part of the injection screen pipe are respectively provided with an iron pipe and a rubber pipe; one end of an inner-layer film bag is fastened to the outsides of the iron pipe and the injection screen pipe; the outlet of the iron pipe is formed in the inner side of the inner-layer film bag and in the outer side of the injection screen pipe; one end of an outer-layer film bag is fastened to the rubber pipe and the injection screen pipe; the outlet of the rubber pipe is arranged in the inner side of the outer-layer film bag and in the outer side of the inner-layer film bag; the other ends of the inner-layer film bag and the outer-layer film bag are fastened to the injection screen pipe; a first grout blocking layer is formed between the inner-layer film bag and the injection screen pipe; a second grout blocking layer is formed between the outer-layer film bag and the inner-layer film bag. The invention also discloses a method for implementing the device. According to the device and the method, the problem of injection pipe sealing in the water bursting sand layer is researched, and problems that sealing slurry is easy to scatter under the moving water condition, a single-layer film bag is easy to damage and the injection screen pipe cannot reach design depth are solved.

Description

technical field [0001] The invention relates to a double-layer film bag device and method for sealing grouting pipes in water gushing sandy soil layers. Background technique [0002] At present, geological disasters such as water gushing, sand gushing, and subsidence are often encountered in the construction of water conservancy, construction, transportation, and mining projects. Advantages of control and low cost. [0003] For grouting engineering, the sealing effect of the grouting pipe itself will directly affect the grouting treatment effect, while the existing technology often uses the orifice-closed pure pressure grouting method, which is very easy to seal the grout in the face of water inrush. Passive water washes away, and at the same time, this method can only be sealed under low pressure, which limits the sealing effect of the grouting pipe. The slurry pipe sealing device has certain necessity. In addition, good sealing of grouting pipe can provide technical sup...

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Problems solved by technology

[0008] The purpose of the present invention is to provide a grouting method for grouting in water gushing sand layers to overcome the problems that the sealing slurry material is easy to wash away, the sand layer is loose and easy to collapse holes, and the single-layer film bag is easy to be damaged during construction under the condition of water gushing. The double-layer film bag device and method for tube sealing adopts the method of establishing a first layer of screen grout layer between the inner layer film bag and the grouting flower tube, and establishing a second layer of screen grout layer between the outer layer film bag and the inner layer film bag And use the conical piercing end to penetrate the sand layer

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