| 摘要 |
PROBLEM TO BE SOLVED: To eliminate unevenness in air-tight performance caused by respective workers and ensure high air-tightness by facilitating the works for ensuring air-tightness in crossing parts of a ceiling air-tight face provided in a ceiling part and an independent column and an external angle part of an internal wall and an internal angle part of the internal wall. SOLUTION: Air-tight covers 9, 25, 38 provided with close adhesion faces 5, 23, 36 having the same shape as that of the crossing parts of the ceiling air-tight face 2 and the independent column 3 and the external angle part 21 of the internal wall and the internal angle part 34 of the internal wall and a horizontal ceiling close adhesion face 7 adhere closely to the crossing parts. |
