HIGH-PRESSURE INJECTION GROUTING SOIL-IMPROVEMENT METHOD

摘要

PROBLEM TO BE SOLVED: To provide a high-pressure injection grouting soil-improvement method in which a treatment speed is increased, an improvement diameter is enlarged and the quantity of sludge withdrawn is not augmented. SOLUTION: A cured body is land-formed in a ground while withdrawing sludge to the ground side by injecting only high-pressure water to the side under the conditions of pressure of 15 to 25 MPa and a flow rate of 25 to 100 liter/min from injection nozzles 15 and 15 without accompanying air respectively from each reverse place to an axial center at the upper-side place of an injection pipe 10 inserted into the ground and injecting cement milk at high pressure under the conditions of pressure of 25 to 50 MPa and the flow rate of 100 to 200 liter/min from injection nozzles 16 and 16 while accompanying compressed air respectively from each reverse place to the axial center at the lower-side place of the injection pipe 10 in a process in which the injection pipe 10 is pulled up while being rotated in the periphery of an axis. COPYRIGHT: (C)2004,JPO