| 摘要 |
PROBLEM TO BE SOLVED: To provide a synthetic resin corrugated pipe the inside of which is formed into a distribution line receiving cylinder part over its whole length and a method for manufacturing the corrugated pipe simply and efficiently. SOLUTION: In a method for producing a synthetic resin corrugated pipe, several nozzles 9a-9c are set in a tunnel-shaped moving molding space 7 having a bellows-shaped inner surface, synthetic resin cylinders 8a-8c are supplied from the nozzles 9a-9c into the space 7, and air is supplied into each cylinder 8a-8c to expand the it. In this way, partition walls 3a, 3b which divide the inside of the pipe by the close contact and integration of the peripheral wall parts of the cylinders facing each other are formed, and the other peripheral wall parts are pressed to the inner surface of the space 7 to form a bellows- shaped pipe wall. |
