FOUNDATION STRUCTURE OF ROOF

PURPOSE:To secure easily by providing jointly structural materials, which open- sides of steel materials with a U shaped section are directed outward each other, at a specific interval, and securing a through material on the upper surface of the structural materials, a stopping tool and a receiving metal fittings placed on the upper surface of the through material by a screw material, etc. CONSTITUTION:Open-sides of steel materials 1 and 1 with a U-shaped section are directed outward, forming structural materials (A) so as to have a specific interval, and the materials (A) are used as beams, the main building, trunk edges, etc. A downward projecting rod 3a of an inverted shaped through material 3 is loosely inserted into a space 2, and at the same time, a receiving metal fittings 4 provided with a mounting bottom 4b is secured on the material 3 at a specific interval. The material 3 is placed on the materials (A), and at the same time, a stopping tool 5 is brought into contact with the bottom of the materials (A), inserting a screw lever into each through-hole to clamp with a nut 6, and the bottom 4b, material 3 and stopping tool 5 are secured. Accordingly, the metal fittings 4 can be easily and speedily mounted.