| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a guide device that can be installed easily and at the same time can cope with, for example, various sizes of hand holes. SOLUTION: In a support rod 16, a fixed pipe 18 and a stretching pipe 20 ate connected so that they can be expanded and contracted via an interlocking pin 30, at the same time the stretching pipe 20 and a screw shaft 22 are screwed together, and the support rod 16 is expanded and can be supported and fixed to an opposing wall surface 14 of a hand hole 12 by a prop by rotating the screw shaft 22 via a ratchet 40. One striking head 36 that is pressed against the wall surface 14 is rotatably mounted to the screw shaft 22 via a bearing unit 34. A guide roller 52 is provided at the stretching pipe 20 so that it can be rotated freely and moved in axial direction and at the same time a removal stop 58 in U shape when viewed from the front is detachably mounted over a guide roller 52.</p> |
