FIELD: construction engineering. SUBSTANCE: cover has assembly of inflatable beams (A, B, C...) longitudinally placed close to each other, means for feeding these inflatable beams with gas under pressure, and means for allowing inflatable beams to slip along at least one guideway for unfolding or stowage of vaulted cover formed by rigid beam passed through sealing arrangements along these inflatable beams (A, B, C...). Mentioned rigid beam is formed by compressed-gas conveying pipeline for inflating or pressure breeding off inflatable beams communicating with means for feeding gas under pressure on one of its ends and with inner hollow of one inflatable beam on other end (A, B, C...) through at least one hole in mentioned pipeline wall provided with means for its closing. EFFECT: improved sealing of cover. 20 cl, 15 dwg
