| 摘要 |
PROBLEM TO BE SOLVED: To prevent creep deformation of a member with the lapse of time in the case of a fitting of polyethylene pipes and display a function of detachment prevention and a sealing property. SOLUTION: A high rigid insertion port core 22 is impregnated and strengthened on an inner peripheral surface 21 of an insertion port 2 of one polyethylene pipe 1A, a high rigid socket core 31 made of a roughly similar cross section to a socket 3 of another polyethylene pipe 1B is included and strengthened, a detachment prevention click 4 to bite on an insertion port outer peripheral surface 23 and a rubber ring 5 for sealing are interposed in a ring space between the socket and the insertion port, a push ring 6 to make contact with and pressurize an outside surface 51 of the rubber ring 5 for sealing is screwed and fastened on the high rigid socket core 31 through a bolt-nut 7, and detachment of the polyethylene pipes from each other and rubber bearing surface pressure lowering due to creep deformation are prevented. Consequently, it is possible to prevent leakage of water during use and to bear drawing force of vibration, reciprocation, etc.
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