| 摘要 |
<p>PURPOSE:To fill filler to the depth of an underground hollow and to make it possible to backfill completely even if earthfall is generated in the midst of the underground hollow. CONSTITUTION:A hose 1 is inserted into an underground hollow H made after an underground buried pipe is pulled out to withdraw, and in a backfilling method of the underground hollow H into which fillet is filled through the hose 1, a flexible shaft 2 is inserted into the hose 1, and an excavator 3 turning as a unit by fitting the flexible shaft 2 to a spline in a state to project from the front end of the hose 1 is provided to the front end of the flexible shaft 2. The hose 1 is moved forward while turning the excavator 3 through the flexible shaft 2, and after the front end thereof is made to reach the depth of the underground hollow H, the flexible shaft 2 is withdrawn from the inside of the hose, and filler is delivered to the underground hollow H through the hose 1.</p> |
