| 摘要 |
<p>PROBLEM TO BE SOLVED: To further easily block up a drain passage in a fire, in a resin drain pipe joint backfilled by penetrating through a floor slab for partitioning an upper floor and a lower floor of a building structure.SOLUTION: A drain pipe joint comprises an upper body part 30 and a lower body part 40, and an interior finish member 50 fitted inside the lower body part 40, the lower body part 40 comprises a taper part 43 being a part backfilled in a floor slab C and forming a downward narrowing flow passage, the interior finish member 50 comprises a body part 51 composed of a thermoplastic resin and a thermal-expansion part 61 composed of a thermal-expansive material of expanding by heat of a fire, the body part 51 comprises a cylindrical part 52 fitted to the inside of the lower body part 40 and guides 54 and 56 supported on the lower side of the cylindrical part 52, overhanging to the inside of the lower body part 41, guiding flowing-down drain water and packed in the taper part 43 by melting by the heat of the fire, and the thermal-expansion part 61 is provided in an annular shape along the outer periphery of the cylindrical part 52, and is arranged in a state of being buried in the floor slab C.</p> |
