To provide a drilling method capable of smoothly discharging slime.
In this drilling method, an inner rod 22 coupled to a drilling bit 20 and an outer pipe 24 for housing the inner pipe rod 22 inside the pipe are used. The inner pipe rod 22 has a medium supply passage 32 for supplying a cooling medium A to a drilling bit 20 is made and formed as a continuous through-hole, and the outer pipe 24 has a discharge passage 34 for the excavated slime B. By driving a drifter 42, a thrust, rotating force and impact are transmitted to the drilling bit 20 and the drilling can be started. At this time, a cooling medium A is supplied to the drilling bit 20, and slime B is ejected to the outside through a discharge passage 34. Thrust and impact force of the drifter 42 are transmitted to the tip side of the outer pipe 24 through a power transmitting portion 46, and it is inserted by a forward pulling method, by which a driving jig for closing the slime discharge passage 34 at the rear end side of the outer pipe 24 can be omitted, and the rear end side of the outer pipe 24 can be used as a released discharge hole for excavated slime B.
NINOMIYA TADASHI
WATANABE HIROYUKI
MATSUDA YASUNORI
KAMEYAMA BIT KK
| JPH09100688A | 1997-04-15 | |||
| JPH0598885A | 1993-04-20 | |||
| JPS63181692U | 1988-11-24 | |||
| JPH0742859U | 1995-08-11 |
Next Patent: DRILLING METHOD AND COUPLING THEREFOR