| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a concrete jacking pipe that can reduce frictional resistance via relatively simple work and equipment and ensures a long jacking distance. <P>SOLUTION: The concrete jacking pipe 1 for use in construction of a sewerage pipe or an electrical pipe has a spigot 13 at one axial end 11, a collar 14 fixed at the other end 12, and injection holes 4 in given intermediate positions. Except for the spigot 13 and the injection holes 4, an outer circumference of the jacking pipe has a resin coating 5, which reduces frictional resistance to a lubricant or filler injected between the outer circumference of the jacking pipe and natural ground. <P>COPYRIGHT: (C)2004,JPO</p> |
