Reinforced concrete ceiling lost formwork panel - has cross reinforcement finishing short of concrete slab longitudinal edges

Spaced lengthways reinforcing pieces have their bottom sections embedded in a concrete slab so that they protrude upwards from it into the space to be filled with site concrete. They make up a panel element serving as lost formwork for prefabricated ceilings made of reinforced concrete. There is at least one transverse reinforcing piece (6,6'), extending across the line of the slab (4) and ending on both sides at an interval (b) from its longitudinal edges (1a). This interval is pref. slightly larger than that (a) between these edges and the nearest lengthways reinforcing pieces (5), and approx. 1/8 to 1/10 slab width, or 200 to 450 mm. The transverse reinforcing piece may be at right angles to the lengthways ones, or slightly angled.