SOIL EXCAVATOR

PROBLEM TO BE SOLVED: To provide a simple soil excavator with few sludge. SOLUTION: The soil excavator includes a shaft pipe 1 having an injection port 11 injecting a soil improvement material to the lower end section, an excavation vane 2 provided downward of the shaft pipe 1 and extended in the centrifugal direction and a holding screw 3 consisting of a plurality of holding vanes provided to the upward shaft pipe of the excavation vane at an interval. Strong earth pressure is applied downward of the screw in order to hold the soil excavated by the screw down, and leakage of sludge from an opening of a pit can be controlled. COPYRIGHT: (C)2006,JPO&NCIPI