BOTTOM COVER FOR CLOSING THROUGH HOLE OF FLOOR SLAB AND METHOD FOR CLOSING THROUGH HOLE OF FLOOR SLAB

To provide a bottom cover for closing a through hole of a floor slab, which can close the lower opening of a through hole formed in a floor slab of an existing structure with a lower surface of the floor slab, when the through hole is closed even if a space below the floor slab is a narrow space where no one can enter, and to provide a method for closing the through hole of the floor slab.SOLUTION: A bottom cover 20 that closes a through hole H1 provided in a floor slab S1 forming an existing structure C comprises a fixing jig 23 including a plurality of divided plates 21 that are foldably connected, a fixed part 23a fixed to an upper surface of the divided plate 21, and a rotating part 23b that rotates with respect to the fixed part 23a, and a hanging member 33 attached to one end of an intermediate member 31 attached to one end of the rotating part 23b. The plane dimensions of the plurality of divided plates 21 are larger than the plane dimensions of the through hole H1. When the hanging member 33 is pulled upward, the upper surfaces of the plurality of divided plates 21 come into contact with the lower surface of the floor slab S1, thereby closing the lower opening of the through hole H1.SELECTED DRAWING: Figure 19B 【課題】既設構造物の床版に形成した貫通孔を閉塞するに当たり、床版の下方空間が人の入れない狭い空間であっても、床版の下面で貫通孔の下方開口を閉塞することのできる、床版の貫通孔を閉塞する底蓋と、床版の貫通孔の閉塞方法を提供する。【解決手段】既設構造物Ｃを形成する床版Ｓ１に設けられている貫通孔Ｈ１を閉塞する底蓋２０であり、折り畳み自在に接続されている複数の分割板２１と、分割板２１の上面に固定される固定部２３ａと、固定部２３ａに対して回動する回動部２３ｂとを備える固定治具２３と、回動部２３ｂの一端に取り付けられている中間部材３１の一端に取り付けられている吊り部材３３とを有し、複数の分割板２１の平面寸法は貫通孔Ｈ１の平面寸法よりも大きく、吊り部材３３を上方に引き上げた際に、複数の分割板２１の上面が床版Ｓ１の下面に当接して貫通孔Ｈ１の下方開口が閉塞されるようになっている。【選択図】図１９Ｂ