BOX-SHAPED FRAME BODY FOR FIREPROOF TREATMENT OF COMBUSTIBLE LONG SIZE MATERIAL PENETRATING PART

摘要

PROBLEM TO BE SOLVED: To prevent leakage of smoke and hot air by preventing the formation of clearance relatively to an inside surface of a hole of a concrete floor in a box-shaped frame body fixed as a member for fireproof treatment to the inside surface of the hole of the concrete floor for penetrating a combustible long size material. SOLUTION: Projecting strips 38 extending in the peripheral direction of the box-shaped frame body are integrally formed in a part embedded in the concrete floor on the outside surface of long side plates 12A and 12B of the box-shaped frame body 10. A cross-sectional shape of these projecting strips 38 is formed in a divergent shape having a width wider on the tip side than the root side. The projecting strips 38 bite into the concrete floor to prevent thermal deformation of the long side plates 12A and 12B.