GB716098A - Composite truss girder - Google Patents

Abstract

716,098. Girders ; roofs. NAAMLOOZE VENNOOTSCHAP ONTWIKKELINGMAATSCHAPPIJ POLYNORM. Dec. 16, 1952 [Dec. 18, 1951], No. 31877/52. Classes 20 (2) and 20 (4) Identical parts of metal girders each composed of two of these parts on either side of the central longitudinal plane of the girder, being mirror images of each other and adapted to be secured together at corresponding parts are constructed so that they can be closely piled in a compact stack, Fig. 10, before assembly. The girders comprise upper and lower longitudinals 6, Fig. 1, and a web 7. The girder parts are constructed of bars of channel section swith inclined sides having -flanges at the upper edges. The bars 8 which form the longitudinals 6 of the ,girder are welded to the bars 10 which form the web by extensions 11, the bars 10 being arranged with their channel openings in the opposite direction to those of the longitudinal bars 8. Two parts are assembled to ,form a girder by spot welding the flanges of the bars 8 at 15, and the bases of the channels at the bars 10 at 16, Fig. 2. The bars 10 may be welded direct without extensions 11, in which case ;the flanges of the longitudinals are cut away opposite the channels of the bars 10 to allow the girder parts to be stacked. In a modification the longitudinals and cross :bars are arranged with the channel openings facing in the same direction and are connected by junction plates. Fig. 1 shows a roof truss composed of girders 1, 2 constructed according to the invention and bolted together by junction plates 3, 4 connected by coupling bars ;5.