| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent generation of a step at a butt joint portion by melting an end surface of a coupling comprising a thermoplastic resin embedded with a heating wire in an inner surface of an enlarged receiving port and an end surface of a pipe body and butting for butt-joining both end surface after the pipe body comprising a thermoplastic resin is extrusion-molded. SOLUTION: A piped 1 is formed by integrally providing a coupling 3 capable of connecting a pipe body to be connected having an approximately same outer diameter as a pipe body 2 on an end of the pipe body 2. The pipe body 2 is extrusion-molded from a thermoplastic resin to a long length and the coupling 3 is integrally formed by injecting a molten resin into a metal mold. A coupling portion 31 having the same diameter as that of the pipe body 2 is integrally formed in the coupling 3 and a heating wire 4 is helically buried in an inner surface of a receiving port with an enlarged diameter continuously provided through an inclined portion 32 having a diameter enlarged from the coupling portion 31 to a tapered shape. When the pipe 1 is manufactured, after molding the pipe body 2, the coupling portion 31 of the coupling 3 is integrally formed to an end of the pipe body 2 by butt-joining it by a but welding, etc., as soon as possible.</p> |
