Reinforced concrete ribbed ceiling

Claim 1

A reinforced concrete ribbed ceiling comprising supporting structure means for providIng scaffolding, shuttering and integral load-carrying capacity including a lower thin steel skin bent to form a plurality of upwardly opening trapezoidal channels, said channels being spaced apart a distance equal to the width of a channel opening, downwardly opening trapezoidal channels being defined therebetween, a wire reinforcing network spot welded to the upper side of said skin and spanning its entire longitudinal and transverse extent, and stirrup means in said trapezoidal channels spot welded to the channel skin and having portions extending above said channels and spot welded to said reinforcing network, a bottom strip spanning transversely across the skin bottom, a plurality of upright head plates closing the downwardly opening channels at opposite sides of said bottom strip, the downwardly opening channels including apertures in their closed channel bottoms and inclined channel sides between head plates, concrete carried by said skin embedding said reinforcing network and said stirrup means, the channel skin, stirrup means, and concrete of the channels forming integral longitudinal ribs, and concrete filling the transverse rectangular channels between the bottom plate and the head plates integral with concrete in the upwardly opening trapezoidal channels forming a transverse rib.