Construction technology of high pressure rotary grouting pile

Abstract

The invention relates to a construction technique of a high-pressure rotary grouting pile, which belongs to the technical field of construction engineering foundation treatment, and comprises the following steps: S1: determining the center point of the high-pressure rotary grouting pile according to the construction drawings; S2: vibrating a cylindrical limiting cylinder to The design elevation of the rotary grouting pile; S3: Use the pilot hole machine to drill a hole at the center point of the high-pressure rotary grouting pile to obtain the pilot hole; S4: Insert the rotary nozzle pipe into the pilot hole to the preset depth and insert it downward During the process, the rotary nozzle sprays water; S5: After the rotary nozzle moves down to the design pile bottom elevation, it starts spraying cement slurry and water, and lifts while rotating. The rotation speed and lifting speed are in accordance with the requirements of the design specification. Until the pile top elevation is designed; S6: pull out the limit cylinder, the present invention has the effect that the pile is easier to form for the geological layer with larger particle gaps.

Description

technical field [0001] The invention relates to the technical field of construction engineering foundation treatment, in particular to a construction technology of high-pressure rotary grouting piles. Background technique [0002] At present, high-pressure rotary grouting piles use a drilling rig to drill a grouting pipe with a nozzle to a predetermined depth in the soil layer, and then spray the slurry or water from the nozzle with a pressure of 20-40Mpa to form a jet flow that impacts and destroys the soil layer. When the dynamic pressure of the pulsating jet with high energy and fast speed is greater than the structural strength of the soil layer, the soil particles will peel off from the soil layer, some fine particles will emerge from the ground with the slurry or water, and the rest of the soil particles will be impacted by the jet flow. Under the action of force, centrifugal force and gravity, etc., it is stirred and mixed with the slurry, and rearranged regularly acc...

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Problems solved by technology

[0004] The above-mentioned existing technical scheme has the following defects: it has good applicability to geological soil layers such as cohesive soil, sandy soil, and gravel soil with good particle gradation continuity, but for serious faults in particle gradation The artificially filled gravel, strong weathered hard rock and other geological formations with large particle gaps, the high-pressure rotary spraying cement slurry is very easy to flow along the rock or block stone gaps, making the high-pressure rotary spraying process poor applicability, rotary spraying It is difficult to effectively guarantee the quality of the pile body, and it is even impossible to form a pile

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