| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a door with a structure capable of preventing a gap from being generated between a vertical frame on a door hanging side and a door body at the time of occurrence of a fire.SOLUTION: A door body 2 is installed to be openable/closable within a rectangular door frame 1 around pivotal shafts 19 disposed above and below the door body 2 on a door hanging side. A first heat foaming medium 24 is attached to a surface 3d of a door hanging side vertical frame 3 which faces an end face 2a of the door body 2. A second heat foaming medium 25 is installed, with a gap reserved with respect to the first heat foaming medium 24, on a surface of the door hanging side vertical frame 3 that faces an indoor side surface 2b of the door body 2. The second heat foaming medium 25 foams after the first heat foaming medium 24. As a result, if a gap is generated between the first heat foaming medium 24 and the door body 2 after the foaming of the first heat foaming medium 24, the second heat foaming medium 25 foams to fill the gap.</p> |
