| 摘要 |
<p>Method in tunnelling for marking out drill holes in accordance with a predetermined drill hole pattern. A direction reference beam (c) is projected in a direction defining the direction of the tunnel and a part beam (e) is deflected from the reference beam, the part beam then being passed to a beam derivating means (d2) by means of which the part beam is directed in accordance with a predetermined drill hole pattern onto the rock surface (4) to present thereon images of the part beam at locations of intended drill holes. Correspondingly, a device for executing said method comprises means (d1) for deflecting at least part of a direction reference light beam (c) to form a part beam (e), and means (d2) to direct the part beam onto locations of holes to be drilled in accordance with a predetermined pattern. </p> |
