Double-fluid deep-hole bottom fixed-point accurate mixed construction process and grouting structure

Abstract

The invention discloses a double-fluid deep-hole bottom fixed-point accurate mixed construction process and a grouting structure. An accurate mixing problem of double-fluid grouting is solved, the matching ratio of the double-fluid can be quantitatively adjusted through a double-high-pressure PVC (Polyvinyl Chloride) grouting pipe, and the setting time is controlled; a double-fluid slurry is mixed at a hole bottom predetermined area, so that a double-fluid grouting range is artificially controlled; with fixed-point accurate double-fluid grouting, the mixing distance and the mixing time of the double-fluid in a drill hole can be reduced, and the dispersion range of the double-fluid slurry is expanded; and the operation can be carried out simply. The technical scheme is characterized in that the double-fluid deep-hole bottom fixed-point accurate mixed construction process comprises the following steps of drilling to the depth of an intact rock, and downwards placing a steel sleeve pipe in a drill hole to the intact rock part; adopting the double-fluid slurry for sealing an outer wall of the steel sleeve pipe and a drill hole wall; continuously drilling to the estimated grouting depth, and downwards placing two grouting pipes in the drill hole; and sealing the grouting pipes and the drill hole wall, and forming dense confining pressure sections outside the grouting pipes.

Description

technical field [0001] The invention relates to the technical field of grouting, in particular to a double-liquid deep hole bottom fixed-point precise mixing construction technology and a grouting structure. Background technique [0002] The double-liquid grouting method can make the cement slurry coagulate quickly, so as to achieve the effect of water-stopping or improving the bearing capacity of the ground. This method has become an indispensable construction method for water-blocking projects and has been widely used. [0003] At present, the traditional two-liquid grouting method has two construction techniques: two-liquid mixing at the orifice and two-liquid mixing at the bottom of the hole. For the two-liquid mixing process at the orifice, the two-liquid slurry is mixed at the orifice and then reaches the bottom of the hole through the high-pressure PVC pipe. During the process of conveying the two-liquid, due to the limitation of the initial setting time of the cement...

AI Technical Summary

Problems solved by technology

For the two-liquid mixing process at the orifice, the double-liquid slurry is mixed at the orifice and then reaches the bottom of the hole through the high-pressure PVC pipe. During the process of conveying the two-liquid, due to the limitation of the initial setting time of the cement slurry, it is easy to solidify in the high-pressure PVC grouting pipe, which hinders The grouting process limits its scope of action and reduces the water blocking effect

For the two-liquid mixing process at the bottom of the hole, the cement slurry is injected from the orifice, and the water glass liquid is injected from the bottom of the pipe, so it is impossible to realize the fixed-point and accurate proportion mixing of the two liquids

[0004] To sum up, in the prior art, there is still no effective solution to the problem of precise mixing of two-liquid grouting

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