| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an air-tight structure for improving air-tight performance and construction efficiency in air-tight construction to a ceiling penetration part for inserting electric wiring especially provided inside a partition wall and a ceiling penetration part for inserting wiring for lighting for a ceiling in conducting air-tight construction to penetration parts for wiring bored in the ceiling. SOLUTION: In this air-tight structure, a first penetration hole 3 is bored in a ceiling surface 1a including an upper surface of a partition wall 1, an air-tight bushing 4 provided with an engagement part 4a to be engaged while it is tightly applied to the first penetration hole 3 without a gap, and a lock part 4b to become an insertion end for the engagement part 4a, and a first passage 4c for electric wiring in which a first protective piping 2a is inserted while it is tightly applied without a gap is engaged with the first through hole 3, thereby the first protective piping 2a is inserted into the first passage 4c for electric wiring.</p> |
