| 摘要 |
<p>PURPOSE:To eliminate a need for a boring machine and to investigate geological features by a borehole camera by a method wherein a small-diameter investigation hole to be used as a borehole is bored in the same manner as the boring operation of a blasted hole. CONSTITUTION:Three small-diameter holes 11A, 11B, 11C are bored by using the boring machine of a blasted hole, the image of the inside of each hole is picked up by a borehole camera 12, and the geological features of the ground as an object to be investigated are grasped three-dimensionally on the basis of the situation of the inner wall surface of each hole.</p> |
