BRIDGE SPAN STRUCTURE Russian patent published in 2005 - IPC

FIELD: bridge building, particularly for building motorway bridges and pedestrian overpasses, mainly of wood and metal.

SUBSTANCE: span structure has wooden deck having thickness changeable along span length. The greatest thickness is in span center part and the lesser one is at span edges. Deck forms extensions inclined to transversal deck axis and transversal pre-tensioned reinforcement located inside deck, supporting subdiagonals located under deck and arranged coaxial to longitudinal deck edges. Rigid inclined transversal tie system formed at each deck end part consists of upper and lower belts, struts and post. Upper belt of each tie system rests upon corresponding inclined deck extension, lower belt thereof is pivotally connected to subdiagonals by ends thereof. Post extends in tie system plane along line laying in vertical longitudinal axial deck plane and rigidly secured to tie system belts by ends thereof. Struts are connected by their ends to lower belt and to lower post end and rigidly secured to corresponding end parts of upper belt by another ends thereof. Deck thickness in span is 1.6 - 1.9 deck thickness at deck ends.

EFFECT: increased load-bearing capacity of span structure, its flexural rigidity and torsional rigidity in transversal direction.

2 cl, 2 dwg