CONTROL METHOD FOR FINISHED PILE DIAMETER IN FORMING CONSOLIDATED PILE BY JET CONSTRUCTION METHOD

摘要

PURPOSE: To control the finished pile diameter in the ground by injecting a high-pressure jet of a hardening agent or water and an air jet surrounding its periphery from a pair of nozzles, and adjusting and crossing the nozzle injection angles. ;CONSTITUTION: The injection angles α, β of the upper and lower nozzles 10a, 10b provided at an interval in the longitudinal direction at the lower end section of a pipe 6 inserted into the ground are made adjustable. The injection angles of the nozzles 10a, 10b are set to form a crossing jet S, the crossing angle γis set to the predetermined angle corresponding to the throw range. The pipe 6 is rotated while a high-pressure multi-layer jet J constituted of a high- pressure jet J1 of water or a hardening agent and an air jet J2 injected to surround its periphery, a processing machine 5 is moved in one vertical direction, and a columnar formed pile B having the outermost edge at the point T where the crossing jet S is formed is finished.;COPYRIGHT: (C)1995,JPO