| 摘要 |
<p>PURPOSE:To provide an electrofusion coupling having excellent creep resistance in spite of the form of the coupling. CONSTITUTION:A circular body 3 for reinforcement comprising material having a higher fusing point and a larger rigidity than those of resin composing a coupling 1 is embedded in an inner circumferential surface on the coupling center side of a fusion part of the coupling 1 with a pipe 2. The rigidity at the part is thus increased by embedding the circular body 3 for reinforcement in the inner circumferential surface on the coupling center side of an end part 4 of the fusion part of the coupling 1 with the pipe 2, and an aperture at the end part 4 of the fusion part can be restricted, thereby occurrence of cracking from the part can be prevented.</p> |
