The invention provides a high-pressure jet grouting
pile construction method which achieves the technical effects of reducing construction cost and further adapting to the construction environment ofa
silt geological layer by improving an existing high-pressure jet grouting
pile construction technology. The method comprises the following steps that a drilling
machine is installed, specifically, the drilling
machine is arranged on a set hole position, inclination of a jet grouting
pipe is less than or equal to 1.5%, and the distance between an injection hole and a high-
pressure grouting pump is less than or equal to 50 m; drilling is carried out, specifically, the deviation between a drilling position and design is less than or equal to 50 mm, the
drill bit inclination is smaller than or equal to 1.5%, and a core
barrel is pulled out after drilling;
pipe inserting is carried out, specifically, the jet grouting
pipe is inserted into the stratum by a preset depth; spraying and grouting are carried out, specifically, spraying and grouting are carried out from bottom to top, and after rotating and spraying are carried out by 1 min at the bottom of a
pile, rotation, lifting and sprayingare simultaneously carried out; the grouting pipe is lifted up, specifically, when the grouting pipe is lifted, a drilling rod is synchronously and continuously rotated without interruption, and theslurry
discharge amount is between 10% and 20%; the overlapping length of subsection lifting of the grouting pipe is greater than or equal to 100 mm; washing is carried out, specifically, the groutingpipe and an operation
machine are washed until no residual
cement slurry exists; and equipment is moved, specifically, relevant equipment such as the drilling machine is moved to a new hole positionto carry out next pile construction.