Tri-tube tri-high-pressure jet grouting pile construction method

Abstract

The invention relates to a tri-tube tri-high-pressure jet grouting pile construction method, and belongs to the field of constructional engineering. The tri-tube tri-high-pressure jet grouting pile construction method comprises the following steps: a first step of measuring, paying off and positioning, wherein measurement is performed according to a designed construction drawing, and a construction axis is paid off; a second step of guiding a drilling machine to be in place, wherein the drilling machine is mounted on a designed pile position, and a drill bit of the drilling machine is alignedto the center of the pile position; a third step of drilling, protecting walls and forming holes, wherein the drilling machine is used for drilling holes, and the walls are protected with mud until hole depth achieves designed elevation; a fourth step of separately forming a mud outlet, a water outlet and a gas outlet in the bottom end of a grouting rotary-jetting tube, wherein a pressure value ofair sprayed out by the gas outlet ranges from 1.6 MPa to 2.2 MPa, the water outlet is positioned above the mud outlet and the gas outlet, and the water outlet in the rotary-jetting grouting tube is drilled for washing and reaming while the jetting grouting tube carries out grouting; a fifth step of flushing; and a sixth step of moving the machine. A relatively great gap is formed between the grouting tube and the hole wall, so that pressure in holes is conveniently released, and high water pressure is reduced.

Description

technical field [0001] The invention relates to the field of construction engineering, in particular to a construction method for a triple-tube triple-high-pressure rotary grouting pile. Background technique [0002] The high-pressure rotary grouting pile belongs to the category of high-pressure jet grouting. On the basis of static pressure grouting, it is developed by using high-pressure water jet cutting technology. The double high-pressure rotary grouting method uses the energy of the ultra-high pressure jet fluid movement to destroy the foundation structure, and forms a large-diameter reinforcement by mixing the disturbed soil particles with the hardened material. This technology is widely used, and has the advantages of convenient construction, simple process, quick effect of foundation reinforcement, good durability, short construction period, etc., and has a wide source of materials, low price, low noise, no pollution, no pollution, and no production safety. [0003...

AI Technical Summary

Problems solved by technology

Conventional high-pressure jet grouting piles have been difficult to meet the needs of ultra-deep underground projects due to a series of defects such as low work efficiency, small pile diameter, and large soil squeezing effect.

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