| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain fire resisting performance while solving a problem of corrosion, by providing a resin coating layer in an outer surface of a joint main unit, providing an end part of the resin coating layer in a cylinder unit fusion- connected to a thermoplastic resin pipe, and covering the resin coating layer in an on-ground rise up part of a joint main unit with a protecting cover having weather resistance. SOLUTION: A joint main unit 10 of a riser pipe joint for connecting a gas meter is provided with a connecting tapered internal thread 11 in one end and formed with a resin coating layer 12 in an outer surface. A cylindrical part 13 is provided in this resin coating layer 12, and a cylinder unit 14 is provided to protrude from an end part of the joint main unit 10 in the other end side. This cylinder unit 14 is connected to a buried resin pipe of supply source by a resin-made electric fused joint. An outer surface resin coated steel pipe 19 is connected to the tapered internal thread 11, and an end part of this steel pipe 19 is arranged in the gas meter. A ground exposed part of the joint main unit 10 is covered with a protecting cover 17. In this way, the steel pipe 19, even when it is heated in a fire, is cooled by a buried part of the joint main unit 10, to hold safety in a fire.</p> |
