Super large diameter multiple ultrahigh pressure jet grouting construction method

Abstract

The invention discloses a super large diameter multiple ultrahigh pressure jet grouting construction method. The method includes the following steps: adopting a hole guiding drilling machine to guidea hole at a point to be grouted; after hole formation, lowering a drilling tool of a rotary jet machine to the bottom of the hole, wherein the lower end of the drilling tool is provided with two spraying sections, respectively an upper spraying section and a lower spraying section; operating the rotary jet machine, lifting the drilling tool and enabling the upper spraying section and the lower spraying section to spray cement slurry to the outside to form a rotary jet grouting pile around the drilling tool. The method has the advantages that the upper spraying section and the lower spraying section are arranged on the drilling tool, and the cement slurry is sprayed in the drilling tool lifting process and dilutes the slurry in the cutting mode. At the same time, the rotary jet spraying pile reliable in quality is formed around the drilling tool, the internal pressure stability is effectively controlled, and the grouting quality and efficiency are ensured.

Description

technical field [0001] The invention belongs to the technical field of foundation construction, and in particular relates to a super-large-diameter multiple ultra-high-pressure jet grouting construction method. Background technique [0002] In the construction process of the existing high-pressure grouting method, the mud is naturally discharged on the ground through the gap around the drill pipe. However, it is very difficult for the mud discharge operation deep in the ground, because the internal pressure around the ultra-deep drill pipe and the high-pressure injection port increases, which often leads to a decrease in the injection efficiency, so the reinforcement effect and reliability are reduced. In addition, during the construction process, the internal pressure increases, which will cause the surrounding surface to bulge. [0003] The MJS construction method (Metro Jet System) is also known as the all-round high-pressure jet grouting method. On the basis of the exis...

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Problems solved by technology

[0004] However, in the actual on-site construction, it is easy to be blocked by larger soil blocks during the mud discharge process. Due to the high density of the mud, it is also easy to cause blockage of the mud suction port, resulting in poor mud discharge, which affects the construction quality and construction progress.

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