To provide a bedrock drilling device and a bedrock drilling method, suitable for drilling downward extending holes in a bedrock while partly overlapping each other.
In the state that a guide rod 20 is inserted into an already drilled second hole 24B, a closing member 30 is inserted into an already drilled first hole 24A adjacent to the second hole 24B to close a communication area between the first hole 24A and the second hole 24B over the total length of the first hole 24A. The closing member 30 prevents cuttings formed when drilling a third hole 24C adjacent to the second hole 24B from entering into a slit groove including the first hole 24A through an annular gap 26 between the outer periphery of the guide rod 20 and the inner wall of the second hole 24B.
TSUCHIYA TOSHIRO
ASANUMA YASUKI
| JP2006161397A | 2006-06-22 | |||
| JP2011099262A | 2011-05-19 |