PURPOSE: To simplify the fitting work of a folded roof plate, by fixing a frame on a bolt fitted spirally on the upper surface of a fixing metal fittings, to be supported, and by fitting the fixing metal fittings on a beam, with a fixing metal fittings stop provided with a folded engaging section and a slot fitted on a bolt.

CONSTITUTION: On a female screw 3a set on the upper surface of a U-formed fixing metal fittings 3, a bolt 2 is spirally fitted. At the upper end of the bolt 2, a frame 1 is supported and fixed on a specified level from the fitting surface of a beam 5. The fixing metal fittings 3 are fitted on the beam 5 by providing one end with a folded engaging section 4a and the using a fixing metal fittings stop 4 provided with a slot 4b fitted on the bolt 2. Then, on the frame 1, a folded roof plate 6 is fitted, and the projection 6a is engaged with the engaging step section 1b of the frame 1. As a result, the roof plate can be fitted only by engaging the fixing metal fittings 3 with the edge of the beam 5 and by fastening the bolt 2, and so the work of fitting is simplified, and a fitting position is easily regulated.