| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a manufacturing method for a ribbed pipe with a branch pipe having the branch pipe integrally formed thereto, capable of connecting the branch pipe or a pipe joint, which has a diameter almost same to that of the ribbed pipe, to the ribbed pipe. <P>SOLUTION: A flat shape part 14 having a flat outer peripheral surface is formed to the periphery of the branch pipe forming part of the ribbed pipe 11 at the time of molding of the ribbed pipe 11 without forming ribs 12 and, after the ribbed pipe 11 including the flat shape part 14 is molded, the flat shape part 14 is protruded outward from the interior of the pipe so as to be formed into the shape of the branch pipe 16. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
