BRIDGE AND METHOD FOR BRIDGE ERECTION Russian patent published in 2000 - IPC

FIELD: bridge building. SUBSTANCE: bridge has permanent bearings and a framework consisting of steel and reinforced-concrete components combined in a single structure. The novelty is in the fact that the main girders are built up in length of interconnected sections. The lower chord of the middle section is provided with bearing flanges, and the inclined strut members are rigidly attached with their upper ends to the bearing flanges of the lower chord of the middle section of each main girder. The lower ends of the inclined strut members are rigidly interconnected with formation of a rigid triangle by the inclined strut members and the section of the lower chord of the middle section of the main girder enclosed between them. The ratio of member lengths is determined by the given dependences. The framework is made of sections. The lower chord of the middle section is provided with bearing flanges. The framework is erected by sections. On the ground attached to the bearing flanges of the middle section of the main girder are the upper ends of the pair of the inclined strut members, whose lower ends are combined by the bearing flanges with formation of a rigid triangle. EFFECT: reduced material expenditures and enhanced adaptability to erection. 12 cl, 7 dwg