Abstract: A centering for casting concrete roofs comprising a rectangular steel construction including at least two longitudinal girders (1, 2) and a plurality of spaced cross beams (3) welded thereto constituting a support of a flat form board for casting. According to the invention, each one of said cross beams (3) is provided, at least at one end of the centering, with an extension arm (9) which can be moved lengthwise of the cross beam to adjust the total width of said steel construction so that it may be adapted to meet the requirements of supporting form boards with varying widths (FIG. 1).

Abstract: A mold element for casting concrete walls, which comprises a mold wall strengthened by an assembly of elongate structural steels which extend substantially parallel to one another and to one edge of the mold wall, and having at least two mold beams extending transverse to the said structural steels and across the mold wall from said one edge thereof to the opposite edge, each of the mold beams being upright when the mold element is in a vertical orientation, with said one edge uppermost, to form a mold, and each mold beam having one and only one coupling point at which a stay member can be positioned to extend between the mold element and a corresponding opposed mold element to link them together to form a mold cavity between them, said coupling point of each beam being located at a position between 35% and 40% of the length of the beam from the other end thereof.