| 摘要 |
<p>PROBLEM TO BE SOLVED: To ensure water tightness from just after connection, and ensure good water tightness for a long period by interposing water expansion rubber along all circumferences in one or more clearances between an insertion external pipe and a precedence pipe inner circumference, a tip end part of the insertion pipe and a ring, and precedence pipe end surface and a subsequent pipe end. SOLUTION: In the case of work execution of a propulsion pipe, a ring shaped water expansion packing 14 is mounted on a packing seat of a precedence pipe, and a water expansion packing 5 is wound around an outer periphery of an insertion pipe 2, the pipe 2 is inserted in the precedence pipe, the ring shaped water expansion packing 14 is tightly compressed, and a propeller pipe is connected. The water expansion packing 5 mounted on an outer periphery of the insertion pipe 2 is formed in a flat plate shape, and the packing is wound around the insertion pipe 2. At the time of connection, water tightness is held by the ring shaped packing, water tightness is held by a cylindrical packing following with the progress of a time. It is thus possible to hold stable and ensure water stop function at all times.</p> |
