| 摘要 |
<p>PURPOSE:To feed the compressed air sent from a high-pressure hose into a hollow pipe with no trouble via the connection section of a rotary joint and a drum shaft even if a drum is rotated by providing the connection section to connect the hollow pipe wound on the drum to part of the shaft of the hollow supply drum. CONSTITUTION:One end of a drum shaft 13 at the center of a supply drum 12 wound with a hollow, and a high-pressure hose is connected to the other end via a hermetic rotary joint 16. A connection section 21 for connecting the hollow pipe 1 wound on th drum 12 is provided at part of the hollow supply drum shaft 13. The compressed air in the hollow pipe 1 is fed into a tip jig 2 via a flexible pipe, the tip jig 2 is advanced via the driving force by the reaction of the air injected backward through nozzles 5, 6 and the hollow pipe 1 is pulled into a conduit.</p> |
