COVER Russian patent published in 2010 - IPC E04B7/00 

FIELD: construction.

SUBSTANCE: cover comprises girders 1, double-cantilever beams 2 and profiled flooring 3 laid on them. Profiled flooring sheets 3 are fixed to beams 2 and to each other. Beams 2 in cover are made of single channels, which are arranged asymmetrically in adjacent spans between girders. Over girders beams 2 are joined by bolts 4 with overlap of channel walls. Cantilever ends of girders 2 are equipped with protruding rigid pads, which rest against lower shelf of channel in opposite beam 2 at the bottom.

EFFECT: simplified assembly of cover and reduced consumption of material for beams.

3 dwg