摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a fire-resistant composite pipe with a synthetic resin inner pipe being inserted in a fire-retardant or non-incombustible outer layer pipe and combined therewith, wherein the inner pipe does not easily fall off, the inner pipe is easily moved during the work, the portability and handling property are excellent, and the soundproof performance is excellent, and its manufacturing method. <P>SOLUTION: In the manufacturing method, in the fire-resistant composite pipe having an inner pipe made of a thermoplastic synthetic resin inside a fire-retardant or non-combustible outer pipe, an elastic packing layer is filled between the inner and outer pipes, and the vibration of the fire-resistant composite pipe is reduced by applying the pressure to the inner pipe by the packing layer by using the rigidity of the outer pipe. The fire-resistant composite pipe is manufactured by covering the outer side of the inner pipe having the packing layer of the outside diameter slightly larger than the inside diameter of the outer pipe and inserting in the outer pipe from the torpedo side into an insertion instrument having the torpedo of the diameter smaller than the inside diameter of the outer pipe on one end, and a cover capable of covering the packing layer on the other end. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |