FIELD: construction.;SUBSTANCE: superstructure consists of box-type plank-stacked-towel-nail blocks combined with transverse stacked timber slab laid immediately on the insulated surface of blocks and fixed by means of bolts to belt bars; at that, stacked timber slab is covered with adhesive waterproofing compound on which there laid is canting and deck consisting of reinforced concrete plates; waste water disposal from the roadway is provided with transverse inclination and longitudinal chutes. Upper and lower flanges of box-type block include bars attached by means of steel plates and attached to walls by means of towel-bolt connections, and two layers of crossed boards attached to the bars by means of nails; at that, boards of the first layer are laid perpendicular to the block axis, and boards of the second layers are laid along the block axis.;EFFECT: increasing load capacity of plank-nail superstructures, reducing material consumption and labour intensity of their manufacture and erection, increasing service life of bridges with plank-nail superstructures.;1 cl, 3 dwg
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