| 摘要 |
PURPOSE: A strong spiral pipe for a drain piping line is provided to reinforce a supporter and an adhesion bar so as to improve workability. CONSTITUTION: Hollow holes(35,35') and reinforcing supporters(31) are formed in a spiral pipe(20) at the spiral rotation. The hollow holes are formed at the upper and lower sides of the reinforcing supporter. A supporting bar having a convex shape is connected to the reinforcing supporter. A reinforcing supporter is welded onto both walls of the hollow holes to construct the reinforcing hole(36) with the supporting bar.
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