BRIDGE SPAN STRUCTURE Russian patent published in 2006 - IPC E01D2/00 E01D12/00 

FIELD: building, particularly to erect small-scale and medium-scale bridges over rivers, rail roads, overpasses, to construct span sections of overpasses, trestles and floor structures.

SUBSTANCE: span structure comprises main metallic tubular beams and metal arch-shaped shells installed between the tubular beams and connected to them, as well as reinforced concrete section connected to main beams by means of thrust members. Main tubular beams are united in at least two mounting units. Each unit comprises at least two spaced apart main tubular beams so that distance between tubular beams is equal to tubular beam diameter. The tubular beams are connected with each other by arch-shaped shell formed of tube half having diameter equal to tubular beam diameter. Mounting units are connected with each other by two overlapped arch-shaped connection members extending along main beam sides and forming arch-shaped shells made as tube halves. The arch-shaped connection members have arch lengths exceeding quarter of tubular beam perimeter. Tension bars are installed in each tubular beam. Transversal ties are arranged in each arch-shaped shell so that transversal ties and tension bars are arranged in horizontal planes and spaced apart along unit length and connected with each other in cross-section to create integral transversal links in the unit. Stiffening members with central orifices are located inside each main beam in thrust parts thereof. Besides, each mounting unit has rod-like thrusts welded to upper mounting unit surface in staggered order so that the thrusts are transversal to above surface. Reinforced concrete section is solid.

EFFECT: simplified structure, reduced time of bridge erection in difficult-to-access areas.

2 cl, 5 dwg