Accurate grouting and water plugging method suitable for silty-fine sand and silty-clay stratums

Abstract

A precise grouting and water plugging method suitable for silty-fine sand and silty-clay stratums comprises the following steps that after a hole is drilled to the designed depth, a drilling rod is withdrawn; the grouting pipe (1) is arranged in the drill hole; a plurality of sets of slurry holes are formed in the positions, at different heights, of the grouting pipe (1) in the circumferential direction of the pipe wall, the grouting process is divided into different engineering sections according to the difference of the height positions of the grouting holes, the part corresponding to the lowest grouting hole is the first engineering section, the grouting holes are sequentially numbered from bottom to top, the part corresponding to the uppermost grouting hole is the Nth engineering section, and N is a positive integer and is larger than or equal to 3; and the grouting construction of the first engineering section to the Nth engineering section is sequentially completed from bottom to top in the grouting process. According to the precise grouting and water plugging method, the slurry pressure loss is small, the grouting channel is not prone to being blocked, and the grouting efficiency is high.

Description

technical field [0001] The invention belongs to the field of foundation reinforcement, in particular to a precise grouting water blocking method suitable for silty fine sand and silty clay strata. Background technique [0002] With the rapid development of China's economy, rail transit projects have become an important project in domestic development. Among them, underground engineering construction, especially tunnel construction, faces many problems with high risk and high technology. For silty sand and silty clay strata, when the geological conditions and surrounding construction environment are complex, the realization of precise grouting and water plugging has become an urgent engineering problem to be solved. [0003] The utility model patent with publication number CN207315407 U (announcement date is May 4, 2018) discloses a fixed-point grouting device. The fixed-point grouting device includes an outer pipe, an inner pipe is arranged in the outer pipe, the outer dia...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the existing fixed-point grouting method has a large pressure loss of the grouting fluid, the grouting channel is easily blocked, and the grouting efficiency is low

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