| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a jig and an engineering method capable of smoothly laying a steel pipe of a drawing object underground in a long distance. SOLUTION: A starting vertical shaft 1 is formed on one s side of a steel pipe laying route, an arriving vertical shaft 2 is formed on the other side, and on the ground on the side of the starting vertical shaft 1, a road setting type propulsive machine 3 to deliver a rotating rod 4 for underground drilling by required propulsive force or to pull it back by required drawing force is set. In a first process, a drill head is installed on a head end of the rod 4 delivered from the road setting type propulsive machine 3, a boring hole is drilled underground from the starting vertical shaft 1 to the arriving vertical shaft 2 by making the drill head intrude underground while rotating it. In a second process, a reamer 6, a drawing jig 8 and a laying object steel pipe 7 are connected in series to a head end part of the aforementioned rod 4 on the side of the arriving vertical shaft 2, and the steel pipe 7 is constructed in such a way as to draw it into the boring hole by pulling back the rod 4 by drawing force from the front by the propulsive machine 3.</p> |
