| 摘要 |
<p>PROBLEM TO BE SOLVED: To enable correction of self rotation of a pipe pulling-in device irrespective of the characteristics of earth in the pipe pulling-in device using a pilot pipe layed at a first step as a guide and pulling a layed pipe such as a public water pipe, sewage pipe in earth without excurvation. SOLUTION: Two cylinders 2 are coupled in V shape to a central connector 1 whose fore part is connected to a pilot pipe D, and a link mechanism 26 protruding to the outer periphery in linkage with a piston rod 21 of each cylinder 2 is provided therefor. A layed pipe G is connected to a rear part of the central connector 1 and each cylinder 2. When this device F1 is in self rotation, the piston rod 21 in one of the cylinders 2 is extended while the other is shrinked to bendwise protrude the link mechanism 26 interlocked with the shrinked piston rod 21. When the device F1 is pulled in under the condition, the protruded link mechanism acts as a brake to correct the self rotation of the device F1.</p> |
