FIREPROOFING MEMBER FOR COMBUSTIBLE LONG MEMBER PASSING PART

摘要

PROBLEM TO BE SOLVED: To retard the conduction of heat by a fire to a fireless side of a fire limit body via a fireproofing member for a part where a combustible long member such as a cable passes in the fire limit body. SOLUTION: Two metallic cylinders 32A and 32B housing a thermally expandable refractory material 38 on the internal side are linked at an axial spacing by an intermediate member 34 made of a material lower in heat conductivity than the metallic cylinders, such as plastics.