| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a fire resistant double-layer pipe having sufficient fire resistance, heat resistance and sound absorbing property, and also having excellent constructing workability. <P>SOLUTION: The method of manufacturing the fire resistant double-layer pipe 1 which has a synthetic resin inner pipe 2 and a mortar outer pipe installed on the outer periphery of the inner pipe in a longitudinally slidable condition, comprises: placing a heat resistant and sound absorbing layer forming material on the endless felt of a papermaking device for a mortar layer forming mortar film; further winding the heat resistant and sound absorbing material on a metal core pipe arranged abutting on the endless felt to form a heat resistant and sound absorbing layer; winding the mortar film made by the papermaling device on the outer peripheral face of the heat resistant and sound absorbing layer up to a predetermined thickness; removing the metal core pipe on which the heat resistant and sound absorbing layer and the mortar layer are formed, from the papermaking device; curing and hardening the metal core pipe; and then pulling it therefrom to mold the mortar outer pipe having the mortar layer integrally with the heat resistant and sound absorbing layer; and inserting the inner pipe into the obtained integrated molded product. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
