FIELD: civil engineering. SUBSTANCE: widening structure of a bridge includes beam-type elements for strengthening the structure in the form of at least a pair of ribs installed symmetrically about lengthwise axis of the bridge. The ribs are placed on cantilevered overhangs of laid on plate. Optionally the ribs may be consolidated into one piece by additional upper plate within limits of the existing bridge. Each rib may be of U shape when placing ribs on cantilevered overhangs. The rib may be combined into enclosure of the road or into rail-like enclosure. Laid on plate may be rigidly connected to the existing bridge or be rested on it in free manner through a pliable layer. EFFECT: structure of high stability. 6 cl, 5 dwg
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