| 摘要 |
The present invention relates to a modular beam 1 e.g. for large area building roofs, of the type which are arranged in parallel on conventional supporting means formed by portal frames or half frames with their corresponding columns and on which the roofing means are arranged. The beam 1 is formed from a rectangular plate of rigid material, preferably metal, having an inverted "U" cross section shape with diverging side walls 11 and flanges 12 on its longitudinal edges, with equidistant holes 17 along the flanges. The junctions of the side walls 11 and central section 13 each have longitudinal chamfers 14. The side walls 11 each have, longitudinally in their central areas, slightly angular recesses 15 provided with holes 16 equidistant from one another. |
