Multi-channel jetting and grouting construction method integrating drilling and jetting

Abstract

The invention provides a multi-channel jetting and grouting construction method integrating drilling and jetting. The method comprises the following steps: medium-pressure clear water is adopted to cut and drill a soil formation, and then pneumatic down-the-hole impacting is started to drill a hole when a complex formation is met; and after the depth required by design is reached, a drill bit is rotationally lifted, jetted high-pressure jet water raidally cut a soil body and entrains a jetted gas-powder mixed solidifying agent, and full mixing and solidification are carried out to form a cement solidified pile body. Through the method, the problems in the prior art that the strength of cement soil of an induration is lower, vertical discontinuous indurations is formed as the cement soil is liable in segregation in the solidification process of a saturated sand layer to severely influence the water stopping effect, and meanwhile, a great deal of mud spillover occurs during construction to pollute the field environment are solved; and the disadvantages that the strength of the cement soil is low, the cement grout is liable in segregation, the quantity of the mud spillover is large to severely pollute the field caused by large underground water injection rate and the like are effectively overcome.

Description

technical field [0001] The invention relates to the field of geotechnical engineering, in particular to the fields of powder high-pressure jet grouting reinforcement treatment and water stop treatment under complex formation conditions. Background technique [0002] The traditional rotary grouting method needs to pre-pilot the hole, and then lower the drill pipe for rotary grouting reinforcement; when encountering complex geological conditions such as boulders, rock filling, sand egg layers, and cataclysmic rocks, it is difficult to form holes and drill down. Disadvantages such as unsatisfactory punching and mixing; due to the use of slurry to transport the curing agent, the formed cement-soil consolidation body has a large water content (usually the water-cement ratio ≥ 2.0). Under the condition of the same cement content, the cement-soil strength of the consolidated body is low; during the consolidation process of the saturated sand layer, the cement-soil (mortar) is easy ...

AI Technical Summary

Problems solved by technology

[0003] The invention provides a multi-channel drilling-spraying integrated jet grouting construction method to at least solve the problem that the cement-soil strength of the consolidated body in the related art is low; the cement-soil is easy to segregate during the consolidation process of the water-saturated sand layer, forming The vertically discontinuous consolidated body seriously affects the water-stop effect, and at the same time, there is a problem that a large amount of slurry will pollute the site environment during construction

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