PURPOSE: To fully eliminate noises and vibration by installing a hydraulic motor to a ring-shaped outer frame, attaching rectangular cutting edges for ground excavation in a ring-shaped inner frame, and installing a plurality of driving gears traveling the surface of the guide pile.

CONSTITUTION: An inner frame b is built in the inner side of a ring-shaped outer frame 'a', a plurality of rectangular ground excavation cutting edges c1, c2 are installed below them, and a plurality of gears d traveling the surface of the guide pile e are attached to the inner side of the outer frame 'a'. Also, the head portion of a guide pile e is gripped by gears d with hydraulic forces, the inner frame b is rotated clockwise in direction A by the hydraulic motor of the outer frame 'a', and the excavation is performed by the cutting edges c1, c2. And by the rotation, the ground resistance is acted counter-clockwise in the direction B as reaction from the cutting edges c1, c2, to the outer frame 'a', and it effectively acts to the force C in the driving direction along the guide pile e by the adjustable gear d. In this way, the rotation shaft of the gear d is adjusted and the driving to all directions along the guide pile e can be carried out.