| 摘要 |
PURPOSE: A socket for connecting synthetic resin pipes is provided to foam a foam sheet including a heating coil by supplying power to the heating coil, thereby enduring internal pressure by charging a foaming foam a gap between the socket and synthetic resins without a cut portion. CONSTITUTION: A socket(10) for connecting synthetic resin pipes comprises a foaming sheet. The foaming sheet including a heating coil(21) is closely adhered to an inner side of the socket. Synthetic resins(1,1a) are fitted from both sides to the inner side of the foaming sheet. Power is supplied to the heating coil. The foaming sheet is foamed by supplying power to the heating coil so that a foaming foam is formed in a gap between the synthetic resins and the socket.
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