Construction method for covering layer closed porthole high-pressure curtain grouting

Abstract

The invention relates to a construction method for covering layer closed porthole high-pressure curtain grouting. The method includes following steps: (1), non-grouting section construction; (2), grouting section hole-creating; (3), grouting section long division; (4), grouting pressure determination; and (5), grouting way determination. A casing pipe is used for following up to the non-grouting section, and mud fixes walls and creates holes, so drilling speed and hole-forming rate can be greatly improved, and the problem of difficulty in hole-forming of a ground layer of a deep covering layer is solved. On the deep covering layer, higher grouting pressure is adopted, grouting injection rate increases obviously, diffusion radius enlarges, and grouting effect is fine. On the covering layer, the closed porthole curtain grouting construction method is adopted, grouting quality is guaranteed, frequent 'pipe hugging'drilling accidents during grouting are basically avoided, and construction efficiency is improved.

Description

technical field [0001] The invention relates to a construction method for high-pressure curtain grouting of covering layers, which is not only suitable for deep covering layers, but also suitable for strata such as weak interlayers and complete rock masses. Background technique [0002] With the continuous development of hydropower construction, the conditions for dam construction are becoming more and more complex, and more and more dams are being built on deep overburden layers and strata with poor geological conditions. The grouting in the overburden layer generally adopts the circular drilling and grouting method, pre-buried Flower tube method, casing method, etc. These methods are either too expensive or difficult to implement for deep overburden, especially complex deep overburden. Contents of the invention [0003] In order to overcome the deficiencies of traditional methods such as "circulation drilling and irrigation method, pre-embedded flower tube method, and ca...

AI Technical Summary

Problems solved by technology

[0002] With the continuous development of hydropower construction, the conditions for dam construction are becoming more and more complex, and more and more dams are being built on deep overburden layers and strata with poor geological conditions. The grouting in the overburden layer generally adopts the circular drilling and grouting method, pre-buried Flower tube method, casing method, etc. These methods are either too expensive or difficult to implement for deep overburden, especially complex deep overburden

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