UNDERCRANE RAIL STRUCTURE Russian patent published in 1996 - IPC

FIELD: civil engineering. SUBSTANCE: underframe rail structure has rail 1, rail chair 2 with flanges 3 straddling the foot of rail 1 and side ribs 4 embracing upper belt 5 of undercrane beam. Chair 2 is connected to upper belt 5 by high-strength bolts 6 with spherical surface nuts 7. Vertical force P_loc of crane wheel acts on rail 1. Chair 2 is made curvilinear, with its convex portion pointed upwards to provide clearance Δ between chair and upper belt equal to 1.5-2-fold thickness of chair. With force P_loc of wheel acting on rail, the latter is clamped by force F n-times greater than force P_loc, F = P_loc•n and is fixed in stressed state. EFFECT: enlarged operating capabilities. 2 cl, 1 dwg