RAILWAY BRIDGE SPAN Russian patent published in 2013 - IPC E01D1/00 

FIELD: construction.

SUBSTANCE: railway bridge span comprises longitudinal main beams, horizontal and vertical stiffening ribs, pier diaphragms, plates of ballast-free bridge deck fixed to longitudinal main beams, and a rail track. The novelty is the fact that longitudinal main beams are equipped at the inner side with vertical diaphragms arranged coaxially to vertical stiffening ribs and are combined between each other by upper and lower belts, forming in the cross section a trapezoid expanded to the bottom with walls of longitudinal main beams inclined towards the vertical axis. Upper and lower belts are equipped along the bridge with alternating holes and links, besides, the links are made in areas of location of vertical diaphragms. Walls of the main longitudinal beams may be arranged at the angle from 81° to 89° to the vertical line. The distance between axes of longitudinal beams in areas of attachment to the plates of ballast-free bridge deck ,ay be in the range from 1700 mm to 1900 mm.

EFFECT: increased operational reliability.

3 cl, 3 dwg