Abstract: A prefabricated ceiling element for ceilings in buildings comprises a concrete ceiling panel (1, 1', 1") and a steel girder (2, 2', 2") having a T-section, the web of which has tips (2c, 2c') which are anchored in the concrete ceiling panel (1, 1', 1"). Free cutouts (2d) are located between the tips. The steel girder (2, 2', 2") extends only over the midportion of the ceiling panel (1, 1', 1"), so that at the ends of the panel support areas and installation lanes (4) remain freely accessible.

Abstract: An assembly element for steel reinforced truss-type panels is cast as a one piece unit in a mold so constructed that the struts of the element are rigidly secured to the upper and lower chord directly as the result of the casting. For this purpose the mold has a lower bottom cap, an upper top base and laterally movable side wall sections. A pair of lateral side wall sections interconnects a bottom cap portion and a top base portion to form a mold part. Thus, the number of mold parts correspond to the number of struts in the element, whereby the element may be removed from the mold in spite of the fact that the top chord and bottom chord are rigidly interconnected already in the mold.

Abstract: A compound girder of an on-site assembly type is assembled to include components which rigidly interconnect two or more prefabricated ceiling panels (3a, 3b) in a bending stiff manner. The compound girder includes for each ceiling panel (3a, 3b) at least one web section (1a, 1b) and an upper chord section (2a, 2b). The girder further includes a continuous length lower chord (4). The lower chord (4) takes up the tension and shearing loads. The individual web sections (1a, 1b) are secured to the lower chord (4) by screw connections which prevent a sliding displacement between the connected elements relative to each other.