FIELD: civil engineering. SUBSTANCE: shutter has shutter sheets fastened by tie-rods and struts. Sheets include decks with horizontal and vertical beams. Each beam is made in the form of two channel-type profiles with shelves of which rigidly interconnected by two partitions placed in parallel to symmetry plane of the profiles. Space between the partitions is 0.25-0.35 height of channel-type profile. EFFECT: improved operating characteristics. 4 dwg
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