| 摘要 |
PROBLEM TO BE SOLVED: To provide a hole drilling device and a hole drilling method capable of surely flushing even when using gas as a flushing medium. SOLUTION: This hole drilling device 1 has a forepiling steel pipe 10. An excavation bit 11 is installed in a tip part of the forepiling steel pipe 10, and a swivel adapter 28 of a swivel joint 26 is connected to a rear end part of the forepiling steel pipe 10. The swivel adapter 28 is connected with a rock drill 19, and excavates the natural ground by transmitting excavation force of the rock drill 19 to the excavation bit 11 via the swivel adapter 28 and the forepiling steel pipe 10. Flushing air is supplied inside the forepiling steel pipe 10 from the swivel joint 26, and the flushing air is injected into an excavation part E in excavation, and discharges cuttings into a clearance part between an excavation hole and the forepiling steel pipe 10. COPYRIGHT: (C)2006,JPO&NCIPI
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