Water stopping device for water inrush borehole drilling

Abstract

The invention discloses a water stopping device for water inrush borehole drilling. The water stopping device for the water inrush borehole drilling comprises a water stopping casing pipe and a small grouting pipe line, wherein a grout outlet I and a grout outlet II are formed in the wall of the water stopping casing pipe line close to two ends respectively; round holes of the grout outlet I and the grout outlet II are located on the same line along the axial direction; the grout outlet I and the grout outlet II are connected with grouting micropipes; the grouting micropipes are arranged in the water stopping casing pipe; the grouting micropipes are connected with the small grouting pipe line; the small grouting pipe line is connected with a grouting pump; the outer periphery of the water stopping casing pipe is provided with a cylinder-shaped mould bag; the internal diameter of the mold bag is moregreater than the diameter of the water stopping casing pipe; after the respectively stretching over the grout outlet I and the grout outlet II, two ends of the mold bag are connected with the water stopping casing pipe in a sealing way; and a cavity is formed between the mold bag and the water stopping casing pipe. In such a way, the dispersion resistance performance of grout is enhanced, the sealing qualification rate of the casing pipe is improved, the grout loss is reduced, the construction material is saved, and the cost is saved; the effective and reliable casing pipe sealing construction can be carried out according to the high pressure water inrush conditions during the borehole drilling construction; and in addition, the water stopping device for the water inrush borehole drilling is especially applied to the sealing of the water stopping casing pipe for soft groundstratum and water inrush borehole drilling.

Description

technical field [0001] The invention relates to the technical field of drilling grouting, in particular to a water gushing drilling water stop device. Background technique [0002] At present, in drilling engineering, there are situations where high-pressure water inrush occurs in multi-layer water-bearing fractures exposed by drilling. In the existing sealing technology, the casing is directly grouted after being lowered into the casing. When the grout enters the casing, it is easily diluted and washed away by water, and the resistance to separation is insufficient. In the process of sealing the casing, there will be gushing water that will be exposed. Closed, long maintenance time is required, and the casing sealing pass rate is low. It is difficult to meet the requirements of the grouting final pressure in the next grouting project. Contents of the invention [0003] The purpose of the present invention is to solve the above-mentioned problems and deficiencies in the ...

AI Technical Summary

Problems solved by technology

In the existing sealing technology, the casing is directly grouted after being lowered into the casing. When the grout enters the casing, it is easily diluted and washed away by water, and the resistance to separation is insufficient. In the process of sealing the casing, there will be gushing water that will be exposed. Closed, requires long maintenance time, and has the disadvantages of low qualified rate of casing sealing

It is difficult to meet the requirements for the final pressure of grouting in the next grouting project

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