Construction method of double-pipe jet grouting pile

Abstract

The invention discloses a construction method of a double-pipe jet grouting pile, which comprises the following steps: high-pressure jet grouting: starting a high-pressure grouting pump and an air compressor after a jet pipe is tripped to a preset depth, starting to swing and lift jet according to set parameters, starting from the bottom of a hole, and stopping jet grouting when a designed elevation is reached; according to the construction method, on the basis of the original technology, the jet parameters are optimized, and the pile forming quality of the double-pipe jet grouting pile in the permeable layer is effectively improved.

Description

Technical field [0001] The present invention belongs to the field of spin-blown pile construction technology, specifically relates to a double-tube rotary-spray pile construction method. Background [0002] High-pressure spin spray grouting method is to spray the liquid at high speed through the high-pressure generating device, cut the surrounding soil, with the improvement of the nozzle, the slurry and the soil are fully mixed and mixed to form a columnar consolidated body of a certain diameter in the soil to achieve the effect of foundation soil reinforcement. [0003] Rotary spray pile requires the reinforcement of the soil body to have good uniformity, self-reliance and sealing, generally has a good effect on the reinforcement of silt, silty soil, clay, silt, sand, etc., but in the treatment of high permeability such as rock throwing, pebbles, sand layers and other high permeability, the pile quality is often poor, and the size and strength of the pile diameter cannot be guar...

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Problems solved by technology

[0003] The rotary grouting pile requires that the reinforced soil has good uniformity, self-support and sealing. Generally, it has a good effect on the reinforcement of silt, muddy soil, cohesive soil, silt, sandy soil, etc. In foundation treatment with high water permeability such as sand layers, the quality of piles is often poor, and the size and strength of piles cannot be guaranteed, which seriously affects the construction efficiency.

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