Perforated pipe method super-deep, fast, and super-large diameter high pressure chemical churning pile construction method

Abstract

The invention relates to a perforated pipe method super-deep, fast, and super-large diameter high pressure chemical churning pile construction method. Two high pressure curing liquid and compressed air injection openings and a high pressure water pipe injection opening and compressed air water injection nozzle are arranged on the lower side of a drill, the position of the high pressure water pipe injection opening and compressed air water injection nozzle is above the position of the high pressure curing liquid and compressed air injection openings, and the two pressure curing liquid and compressed air injection openings are in the symmetric positions of the same flat surface; the high pressure water pipe injection opening downward injects water to conduct cutting, the lower side of a drill stem is higher than a bottom label of a designed pile, then the high pressure water pipe injection opening and compressed air injection nozzle injects a high pressure water pipe injection flow and compressed air injection flow, and the high pressure curing liquid and compressed air injection openings inject high pressure curing liquid and compressed air injection flow. With the drill stem rotating and lifting, adjacent soil body is conducted a secondary cutting, and cement paste and soil are mixed to a pile. Compared with the prior high pressure chemical churning pile, the overall pile formation efficiency is increase by almost 48%.

Description

technical field [0001] The invention relates to a construction method for large-diameter ultra-high pressure rotary jet piles by porous pipe method (Deep Rodin Jet Pile Method, hereinafter referred to as D-RJP construction method), which is applied to soil reinforcement of construction engineering foundations, soil reinforcement of shield tunnel entry and exit holes and In all the projects that need to strengthen and improve the soil body, such as the water-proof curtain of foundation pit engineering. Background technique [0002] The conventional multi-hole tube method high-pressure rotary jetting pile used in previous projects uses high-pressure water and cement slurry to cut the soil at one time, and the low-pressure slurry is sprayed for mixing. The diameter of the pile is limited, generally 0.8-1.2m. The conventional multi-hole tube method of high-pressure rotary jetting piles has low work efficiency, small pile diameter and great soil squeeze effect. With the developm...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a construction method of ultra-deep, fast, and super-large-diameter high-pressure jet grouting piles by the porous tube method, which is used to solve the problems of low pile-forming efficiency, small pile diameter, and large soil-squeezing effect of conventional high-pressure jet-jet piles. and other defects, the diameter of the high-pressure jet grouting pile can reach 3.0~3.5m, and the overall pile-forming efficiency has increased by nearly 48% compared with the conventional high-pressure jet grouting pile.

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