SLOPE STABILIZING METHOD

PROBLEM TO BE SOLVED: To provide a slope stabilizing method capable of providing a sufficient bearing strength against tension, bending, shear, etc. and a sufficient strength for avoiding a collapse of a slope attributable to groundwater. SOLUTION: A small-bore steel pipe 12 has spiral rotary blades 19A, 19b provided on the front end and the rear end thereof and a small-bored check valve, and a small-bore perforated steel pipe 14 functioning as a drain pipe has a spiral rotary blade 19C provided on the rear end thereof. Then, both the steel pipes 12, 14 are rotationally press-driven into the ground with joining the perforated steel pipe 14 to the steel pipe 12 with the check valves via a coupling 15, and the steel pipe 12 with the check valve is driven to penetrate an immovable layer B in the ground, followed by locating the bored steel pipe 14 to a moving layer C above the immovable layer B. Thereafter the check valves are opened from the interior of the steel pipe 12 with the check valve, and a hardenable material grout is pressurized and injected into the ground on the periphery of the steel pipe 12, to thereby anchor the steel pipe 12 to the immovable layer B. In this state, groundwater in the moving layer C is drained from openings of the bored steel pipe 14. COPYRIGHT: (C)2009,JPO&INPIT