| 摘要 |
PURPOSE:To conduct emergency shut off operation at the portion nearest to a gas leakage portion by providing a guide ball and a hollow forward end guide on the forward end of a hollow flexible wire and a bag for intercepting a gas main pipe in the hollow portion of the guide. CONSTITUTION:Guide balls 21, 22, 23 are disposed on a forward end guide formed on the forward end of a flexible wire 11 of a wire leading machine, and the guide balls are connected to one another by coiled springs 24, 25. In the hollow portion 26 of the forward end guide, an expansible and contractible bag 3 for intercepting a gas main pipe is housed in such a manner as to project outward at need, and a supply hose 4 for suitably supplying pressurized fluid into the bag 3 is inserted in the hollow portion of the flexible wire 11. |
