Abstract: Reinforcement body for a cast concrete floor slab provided with stiffening ribs, having a foundation reinforcement (1), a distribution reinforcement (2) and at least one displacement body (8) e.g. of polystyrene foam, arranged between these reinforcements which delimits cavities to accept the stiffening ribs. The displacement body is rigidly fixed between the reinforcements by means of spacer wires (7) connecting the foundation reinforcement to the distribution reinforcement (2) at a selectable distance, e.g. by passing through the displacement body, so that the foundation reinforcement, the distribution reinforcement and the displacement body form a dimensionally stable unit. Additional reinforcement elements (10, 11, 15), can be placed in the rib cavities (9).

Abstract: A lining-frame for a gallery or tunnel comprises two planar latticework trussed arches, each comprising an inner belt (3,4) and an outer belt (1,2) interconnected by a zig-zag rod chain (5,6). The arches are fixed parallel to one another by planar connector elements (81a,82a:81b,82b).

Abstract: A reinforcement mat for reinforced concrete consists of longitudinal wires and crosswires which are welded together at their points of cross. End portions of the crosswires project out beyond the edge longitudinal wires and are bent back in the plane of the mat towards the edge longitudinal wires. The longitudinal wires are arranged symmetrically about the longitudinal centerline of the mat partly at wider and partly at narrower pitch. At each edge of the mat a family of at least two longitudinal wires are provided at the narrower pitch.