| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a sheath pipe jacking method eliminating the fall-in of casters. <P>SOLUTION: The jacking method for constructing a conduit by feeding pipes P into a sheath pipe P' while inserting a spigot 1 of the pipe P into a socket 2 of the preceding pipe P and joining them together is carried out by guiding the travel of the pipes P in the sheath pipe P' by the casters 24 provided around the pipes P. A plurality of casters 24 are provided in front and in the rear in a pipe axis direction, and even if one caster 24 corresponds to a joint recess b' between the sheath pipes P', P', the other casters 24 abut on the inner surface of the sheath pipe P' and prevent the one caster 24 from being fitted into the joint recess b' to carry out jacking. In this manner, even if the one caster 24 corresponds to the joint recess b', the other casters 24 abut on the inner surface of the sheath pipe P' to obtain the smooth traveling (jacking) of the pipes P with no risk of the one caster falling into the joint recess b'. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
