| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a fire resistant two-layer pipe in which an inner tube is formed of a synthetic resin pipe, and mortar of an outer layer is hardly cracked, and which is free from peeling and dropping-off, has superior impact resistance and fire resistance, can be manufactured easily, and can be obtained at low cost, and to provide a manufacturing method therefor. <P>SOLUTION: The fire resistant two-layer pipe 1 is manufactured in which an outer circumferential surface of the synthetic resin pipe 2 is coated with a mortar impregnated layer 3 with mortar impregnated in a nonwoven fabric or continuous cell foam, by impregnating the mortar in the nonwoven fabric or the continuous cell form, and curing and drying them to form the mortar-impregnated layer 3, after winding the nonwoven fabric or the continuous cell foam around the outer circumferential surface of the synthetic resin pipe 2. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
