FIELD: construction.
SUBSTANCE: invention relates to bridge construction, in particular to the construction of large span bearing structures of multi-tier bridges. Bearing structure of the span structure of a multi-tier bridge includes vertical bearing supports, large-span bearing structures of metal trusses, bearing horizontal discs of slabs. Bearing large-span structures of metal trusses are made in the form of flat combined truss systems, in which horizontal belts of the bearing large-span structures of metal trusses are made in the form of belt trusses or belt beams. Horizontal belts of the bearing large-span structures of metal trusses are made in three or more levels by the height of the large-span structures of metal trusses. Horizontal belts of the bearing large-span structures of metal trusses are interconnected by a system of inter-tier rack and truss elements. Horizontal discs are made in the level of each tier of the horizontal belt trusses or the belt beams of the bearing large-span structures of metal trusses.
EFFECT: technical result is the improvement of the bearing large-span truss structure for the construction of multi-tier bridges.
1 cl, 22 dwg
