FORMATION OF FIRE-RESISTANT AIRTIGHT PENETRATION SECTION

摘要

PURPOSE:To reduce the loss of a member and to improve operability by engaging a square or rectangular inner frame with the uneven boundary of an outer frame matched to the shape of an uneven floor through hole shape as a partition with a sidewall. CONSTITUTION:An outer frame 4 matched to the opening of a floor through hole 1 is engaged fixedly. In this case, a sealing material 5 is filled in a gap formed between the frame 4 and the hole 1. An inner frame 6 is engaged with the frame 4, and a bridge 7 is provided on the lower face of the frame 6 so that flame-retardant sheets 8, 8' and a refractory heat insulation plate 9 do not drop. The sheet 8, the plate 9 and the sheet 8' are sequentially inserted in this order in a state supported by the bride 7 in the frame 6. After a cable (a) is inserted into an n intersection (s) of a longitudinal slit and a lateral cutout, age-solidifying sealing material S is poured in an upper space Q to complete the formation of a fire-resistant airtight penetration section.