To facilitate fire resistant covering work, and to form a fire resistant heat insulating layer by heating/expanding a heat-insulative expansion material at a fire by covering a steel frame by integrally laminating a sheet composed of the heat- insulative expansion material on a sheet composed of an incombustible material.
A sheet 12 composed of heat-insulative expansion material is integrally laminated on a sheet 11 composed of an incombustible material to be bent or be molded in a cylindrical shape so as to cover the periphery of H shape steel 13. The sheet 12 is formed of a resin composition having tensile ductility not less than 50% and a thickness of 0.3 to 5 mm, and when it is heated for 30 minutes in an irradiation heat quantity of 50 kW/m2, a thickness expands 5 to 30 times as much as an initial thickness. The sheet 11 is formed of a metallic thin plate having a thickness of 0.1 to 0.5 mm or an inorganic plate having a thickness of 5 to 20 mm, and can be extended/contracted by a wave shape, a bellows shape and seam folding joining so as not to hinder the expansion of the sheet 12 to form a slight cavity between the sheet 12 and the H shape steel 13. Thus, fire resistant covering work is facilitated, and a fire resistant heat insulating layer can be formed by heating/expanding the sheet 12 at a fire.
TONO MASAKI
YAMAGUCHI BUNJI
AMANO HIROFUMI
MURAOKA HITOMI
ONISHI KATSUNORI
IRI CHIKA
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