| 摘要 |
<p>Provided is a boring device (1) which is configured so that a core (201) produced after boring performed by a core drill (100) is gripped within a core tube (102) with relatively large force and so that the core can be easily released and extracted. The boring device is characterized in that: the boring device is provided with a housing (104) provided in the core drill and gripping the core; a thread section (141) formed at the front end of the housing and a tapered thread section (151) formed inside the core drill are engaged with each other; and the core which is broken off after boring is gripped by tightening the front end of the housing. Also, the boring device (1) is provided with a core breaking jig (106) for breaking off the core after boring.</p> |
