| 摘要 |
PROBLEM TO BE SOLVED: To prevent a door panel from being damaged due to deformation of a supporting structure material surrounding the door panel in the case of a fire.SOLUTION: A supporting structure material 41 includes: a bolt 90 penetrating through a fire-protection heat-insulating board 71 having a door panel 42 arranged in an inner side thereof, a front side steel plate 73, and a rear side steel plate 72; a first washer 92a for fixing a head 91 of the bolt 90 to a loose hole 94a opened in a vertical direction on the rear side steel plate 72; and a second washer 92b for fixing a screw tip side of the bolt 90 to a loose hole 94b opened in the vertical direction on the front side steel plate 73. The first washer 92a and the second washer 92b are formed of a material which is extinguished when it is heated to a prescribed temperature.SELECTED DRAWING: Figure 6 |
