| 摘要 |
<p>The method concerns drilling of long and straight holes (3) in rock, for cutting rock and ore bodies. A drill rig (1) may be aligned by means of a laser beam (7), and comprises a hollow drill stem 2 ) with a pressure device for guiding the drill stem (2) in the correct direction on applying pressure against the wall of the drilled hole (3). A laser beam (7) is sent into the hollow drill stem (2) towards an optical detecting unit placed inside a hollow control means (4) joined into the drill stem (2) behind its drill bit (5), the control means being operated by signals from the detecting unit. The control means (4) constitutes a connecting piece of the drill stem (2) and comprises the pressure device which is in contact with the wall of the hole. The optical detecting device is arranged with free sight to the source of the laser beam (7) as long as the drill stem (2) is sufficiently straight.</p> |
