| 摘要 |
PROBLEM TO BE SOLVED: To suppress the rise of cost, perform pipe connection work easily and speedily, and cut off water securely. SOLUTION: A large pipe 2 which has an inside diameter of 1000 mm or more, is made of synthetic resin, has a spiral or annular shape in which projecting parts 2A and recessed parts 2B are alternately positioned in the direction of pipe shaft axis, and is formed into a wave shape is provided with a flange 1 for connecting pipes at at least one end. |
