REINFORCING STRUCTURE OF CEILING OPENING

PROBLEM TO BE SOLVED: To simplify the construction of a reinforcing structure of a ceiling opening, make the reinforcing structure of the ceiling opening uniform or standardize it, and to reduce the cost of construction and shorten term of works without restricting layout design or layout work of a ceiling finish material. SOLUTION: A reinforcing member 30 provided with a recessed section in which an opening fringe 15 of a ceiling opening can be stored is mounted on the opening fringe, and the reinforcing member 30 is provided with an apparatus support section 34 which protrudes inward in the ceiling opening so that a ceiling mounting apparatus 60 to be arranged in the ceiling opening is supported. A mounting metal fitting 40 which can be engaged with a back cross-piece 11 is provided between the cross-piece and the reinforcing member, and the mounting metal fitting is provided with a base 41 which can be inserted into a hollow section of the cross-piece and a locking section 42 which can lock the reinforcing member. The locking section positions the reinforcing member at the position where the recessed section 36 of the reinforcing member stores the opening fringe, and a tightening tool 50 for fixing the base of the mounting metal fitting on the cross-piece is provided in the base.