VERTICAL HOLE EXCAVATION METHOD AND DEVICE THEREOF

PURPOSE:To excavate a vertical hole, specially a vertical hole having a large diameter efficiently and safely, obviate the improvement of the peripheral ground and easily cope with the change of an excavation diameter, etc. CONSTITUTION:A hollow pipe 1 and an excavation vane 2 mounted to the lower part of the hollow pipe 1 are rotated, the ground is excavated by a cutter 14 of the excavation vane 2 and, at the same time, the excavated earth 16 is moved in the central direction of the excavation vane 2. In addition, the earth is taken in an earth inlet 3 provided to the center cylindrical section 2a of the excavation vane 2 the earth inlet 3 provided to the lower part of the hollow pipe 1 the hollow pipe 1. After that, the excavated earth in the hollow pipe 1 is moved to the ground by an earth moving device 5 such as a hammer crab, etc. A new hollow pipe is added to the existing hollow pipe 1 with the progress of excavation. After the completion of excavation to a specific depth, when the excavation vane 2 is only rotated and lowered down to the lower end position of the hollow pipe 1, the bottom of the vertical hole can be finished in a smooth state.