| 摘要 |
PURPOSE:To fit securely a reinforcing material of batten shape continuing in the longitudinal direction on a helical pipe manufactured by winding a belt- shaped body helically. CONSTITUTION:A batten is formed into a reinforcing material of given section by a section molding machine 52, and then wound helically by a reinforcing material bending roll 36. Then, a reinforcing material 50 is inserted between reinforcing ribs of a helical pipe 20 manufactured by winding a synthetic resin belt-shaped body 10 by means of a reinforcing material inserting roll 37. |
