| 摘要 |
PROBLEM TO BE SOLVED: To provide a joint capable of solving its unnatural appearance. SOLUTION: In a joint comprising plural coupled cylinders 6 and 7 integrally formed, which are mutually intersected, and made out of synthetic resin while being coupled with the end of each resin coated steel pipe 5 at both the ends of it, wherein at least paired holding ribs 3a are formed in the axial direction except one end part of each pipe for holding each periphery of a bulkhead body 4 on coated resin 3 coating the surface of a thin steel pipe 2 in order to join plural resin coated steel pipes 5, paired holding ribs 6a and 7a for holding the peripheries of the bulkhead body, are formed over the whole length of the joint in such a way as to be positioned in one plane surface including respective axial lines at least at the sides of adjacent two internal corners of the plural coupled cylinders 6, 7.
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