| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an egineering method capable of smoothly laying a steel pipe to draw in underground in a long distance. SOLUTION: A starting vertical shaft 1 is furnished on one side of a pipe laying route, an arriving vertical shaft 2 is furnished on the other side, and a road setting type propulsive machine 3 is set on the ground on the side of the starting vertical shaft 1. In a first process, a first rod with a drill head installed on its head end is made to intrude underground by propulsive force by the propulsive machine 3 and made to drill a boring hole underground from the starting vertical shaft 1 to the arriving vertical shaft 2. In a second process, a hole extending reamer 6, a dummy pipe 8 and a second rod 4' are connected to a head end part of the first rod 4 on the side of the arriving vertical shaft 2, the dummy pipe 8 is made to pass along overall length of the boring hole by drawing force from the front by the propulsive machine 3, and a state of the boring hole is grasped by checking an outer surface of the dummy pipe 8 after passing. In a third process, the aforementioned hole extending reamer 6, the aforementioned dummy pipe 8 and an laying objective steel pipe are connected in series to one end of the second rod 4' on the side of the arriving vertical shaft 2, and the steel pipe is constructed in such a way as to draw it into the boring hole by pulling back the second rod 4' by drawing force from the front by the propulsive machine 3.</p> |
