Mixed double-liquid grouting pipe for hole bottoms in fixed-point control fields

Abstract

The invention discloses a mixed double-liquid grouting pipe for hole bottoms in fixed-point control fields. The mixed double-liquid grouting pipe comprises an auxiliary pipe, an outer grouting pipe, an inner grouting pipe and injection holes. The injection holes are formed in the outer grouting pipe and the inner grouting pipe, the inner diameter of the auxiliary pipe is larger than the outer diameter of the outer grouting pipe, portions, except for a conical end, of the outer grouting pipe are arranged in the auxiliary pipe, the inner diameter of the outer grouting pipe is larger than the outer diameter of the inner grouting pipe, a check ball valve is mounted at an end of the inner grouting pipe, the gradient of an end of the auxiliary pipe relative to the horizontal plane ranges from 15 degrees to 30 degrees, and a connecting end is mounted at the tail of the outer grouting pipe and the tail of the inner grouting pipe. The mixed double-liquid grouting pipe has the advantages that the mixed double-liquid grouting pipe is simple in structure and applicable to field manufacture and steel pipe and drilled hole recycling, follow-up drilling construction is unaffected, the repeated drilling quantity can be obviously reduced, the construction period can be shortened, the grouting expense can be saved, and a grouting effect can be improved.

Description

technical field [0001] The invention relates to a mixed double-liquid grouting pipe at the bottom of a fixed-point controlled area hole. Background technique [0002] The two-liquid grouting in grouting engineering mostly adopts casing sealing and forward-type open hole grouting, which cannot realize enhanced grouting in fixed-point areas, and the amount of re-drilling in the grouting process is large, the required construction period is long, and the economic benefits are poor. The effect is difficult to guarantee. When the surrounding rock is soft and broken, there is a problem that the frequency of hole collapse and holding drill accidents will increase significantly due to the large amount of re-drilling, and it is difficult to control the spread of grout due to the collapse of the borehole. When the weak area of ​​the grouting project adopts the fixed-point controlled area of ​​the steel pipe directly to strengthen the grouting, the disadvantage is that the drill hole ...

AI Technical Summary

Problems solved by technology

[0002] The two-liquid grouting in grouting engineering mostly adopts casing sealing and forward-type open hole grouting, which cannot realize enhanced grouting in fixed-point areas, and the amount of re-drilling in the grouting process is large, the required construction period is long, and the economic benefits are poor. The effect is difficult to guarantee

When the surrounding rock is soft and broken, there is a problem that the frequency of hole collapse and holding drill accidents increases significantly due to the large amount of re-drilling, and it is difficult to control the spread of grout due to the collapse of the borehole

When the weak area of ​​the grouting project adopts the fixed-point controlled area of ​​the steel pipe directly to strengthen the grouting, the disadvantage is that the drill hole and the steel pipe cannot be reused, the economic benefit is poor, and the steel pipe remaining in the surrounding rock area will affect the subsequent surrounding drilling construction.

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