| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent the generation of excessive frictional force due to rubbing of a top face of a pipe and natural round at an upper end of a lead-in port when the pipe having flexibility is led in from a vertical pit into a horizontal pit formed by a non-open cut method in the ground. SOLUTION: A jig 4 is provided close to a lead-in port 5 of a PE pipe 1 to a horizontal pit 2 on an inner wall of a vertical pit 3. A pressing shaft 9 screw-connected to a pressing shaft receive metal fitting 13 which is provided in a support device 11 supported on a beam of a cylinder 12 which presses a section between opposing inner wall faces of the vertical pit 3 horizontally from the inside thereof presses a roller hold device 8 downward and vertically owing to the rotation of a handle 15. A horizontal guide roller 6 having an axis which is vertical for an axis of the PE pipe 1 comes into contact with the PE pipe 1 from above to press it. A vertical guide roller 7 comes into contact with it from both sides to suppress bending of the PE pipe 1 to the right and left. The PE pipe 1 advances into the horizontal pit 2 linearly to prevent rubbing of a top face of the PE pipe 1 and natural ground at an upper end of the lead-in port 5.</p> |
