FIRE SMOKE CUTOFF MEMBER, FIRE SMOKE CUTOFF METHOD, FIRE-RESISTANT PARTITION STRUCTURE, AND CONSTRUCTION METHOD THEREOF

To provide a fire smoke cutoff member, a fire smoke cutoff method, a fire-resistant partition structure, and a construction method thereof capable of being easily installed at a wall body position arranged on a lower surface of a flat deck plate and cutting off a hollow part of a reinforcing steel rib arranged in the flat deck plate in a case of fire.SOLUTION: A construction method comprises: forming a cutout C to install a fire smoke cutoff member 100 cutting off a penetration surface of a hollow part 11c in a case of fire at the hollow part 11c of a reinforcing steel rib 11 where a wall body 50 is installed; fixing the fire smoke cutoff member 100 within the hollow part 11c through the cutout C; installing a horizontal member 51 for partitions at a lower surface of a ceiling surface to install the wall body 50; closing an opening formed between the horizontal member 51 for partitions and an irregularity surface of a deck plate 10 with a fire resistance member 60; and fixing the wall body 50 to the horizontal member 51 for partitions.SELECTED DRAWING: Figure 1 【課題】フラットデッキプレートの下面に設置される壁体位置に容易に設置でき、火災時にフラットデッキプレートが有する補鋼用リブの中空部を遮断する火煙遮断材、火煙遮断方法、火煙遮断構造、火煙遮断構造の形成方法を提供することを目的とする。【解決手段】壁体５０を設置する位置にあたる補鋼用リブ１１の中空部１１ｃで、火災時に中空部１１ｃの貫通面を遮断する火煙遮断材１００を設置するための切欠きＣを形成し、切欠きＣから中空部１１ｃ内に火煙遮断材１００を固定し、壁体５０を設置するために天井面の下面に間仕切り用横架材５１を架設し、耐火部材６０で間仕切り用横架材５１とデッキプレート１０の凹凸面との間に形成される開口部を閉塞し、壁体５０を間仕切り用横架材５１に固定する。【選択図】図１