Quadruple high pressure rotary jet grouting technology

Abstract

The invention relates to a quadruple high pressure rotary jet grouting technology which comprises the following steps that firstly, a water pump of a background subsidiary tool conveys high flow of drilling media to a foreground subsidiary tool, the drilling media are conveyed to drilling parts of quadruple drill bits through a quadruple flow distributor and a large channel in a drill rod, and cutting, cooling and slagging are carried out; secondly, after a set depth is drilled to, conveying of the high flow of drilling media is stopped; thirdly, a drilling tool is carried and lifted upwards through power of a drilling machine and carries out rotary motion, meanwhile, the background subsidiary tool conveys cement paste, water and compressed air, and the media are conveyed to rotary jet grouting parts of the quadruple drill bits through the quadruple flow distributor and the drill rod to carry out rotary jet grouting work; fourthly, along with rotary lifting of the drilling tool, high pressure water, gas and slurry cut, stir and fill a soil body, and finally a cement soil mixed cylinder is formed. Construction efficiency is improved, and the drilling difficulty of complex formation can be overcome.

Description

technical field

[0001] The invention relates to the technical field of rotary spraying, in particular to a construction technique of quadruple high-pressure rotary spraying. Background technique

[0002] The soft soil foundation treatment in engineering construction is the key to ensure the quality of the project. Practice shows that the high-pressure injection technology has become increasingly mature after years of research, development and application. High-pressure jet grouting is a technology for treating soft soil foundations. It is widely used in building foundation reinforcement, anti-subsidence, anti-tilt, anti-seepage, anti-sand foundation liquefaction and foundation uplift, etc. The principle of this technology is to use an engineering drilling rig to drill the drill pipe to the expected foundation depth, and a special nozzle is installed in the lower part of the grouting pipe, which can spray high-pressure water, air, and slurry jets above 30MPa in the plane or d...

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