Abstract: A beam, especially for building houses of wood, comprises a web (1) of steel plate, preferably galvanized steel sheet metal, and transverse flanges (2, 3) constituted by wooden elements (6) arranged on either side of edge portions (4, 5) of the web (1) which have been bent back or folded at least twice. The wooden elements (6) are attached to the web (1) by means of nails (7). Wooden posts (8) are arranged along the web (1) to the web in order to protect the web against buckling. The beam combines the beneficial properties of steel and wood. The steel provides stiffness and stability, while the wood permits nailing.

Abstract: A building structure comprises two parallel plates (2, 3) attached to means (4) therebetween forming channels (5, 6). Some of these channels are filled with concrete so that concrete ribs (10, 11) are formed, which preferably are provided with reinforcement (12). This building structure will in many cases be provided with a cover (9) of concrete. In order to form a connection between the cover and the concrete ribs (10, 11), holes (13) are made in one of the plates (3) in order for a monolithic connection to be formed between the ribs and the concrete. A shear force reinforcement (15) may be placed into the ribs (10) though the holes (13). The plates (2, 3) with the channel forming means (4) constitute a prefabricated element (1) which is brought to the building site without holes (13) in said one plate.

Abstract: A mould to be used for production of building elements having fixed to one or more sides of it a layer or layers of a somewhat flexible material, which mould is made of an elastically deformable material so as to be bent and stretched away from the cast element when same has been hardened. A position of the inner surface of said mould consists of a rigid plate to which the layer or layers to be cast fast to the element is held in position during filling of the mould with moulding mass.