| 摘要 |
A spiral ribbed pipe formed from an elongate strip coiled helically. The pipe has a helical seam and an integral reinforcing rib formed along and around the seam, thereby increasing strength and rigidity of the pipe and its seam. The helical seam comprises a pair of interlocking edges located radially inward of the rib and intermediate a pair of offsets, whereby the inner surface of each coil of strip is longitudinally aligned with the surfaces of adjacent coils to provide a smooth interior pipe surface.
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