FIELD: construction.
SUBSTANCE: columns are mounted and joined by covering crossbar. Lantern is arranged over central column and is closed with double-cantilever beam. Columns, crossbar and beam are made of pipes with oval section. Crane beams are installed from oval profiles. Cavity-formers are inserted into oval tubular profiles and are stressed from inside. Hoses of concrete pumps are connected to nozzles of profiles, and concrete that stresses when expanded is pumped into profiles. After setting and self-stressing of frame elements, internal pressure is reduced down to zero in cavity-formers, and they are withdrawn. The structure is equipped with temperature sensors and system of pipes for water supply and its sprinkling inside profiles. In case of fire water spraying is started inside profiles by signal from temperature sensors automatically, and it is drained down along profiles. Tubular profiles are cooled from inside by water evaporation, thus making it impossible for frame metal temperature to increase higher than 120…130° Celsius.
EFFECT: invention eliminates possible collapse of metal structures of frame as a result of fire, their increased fire-resistance and strength.
4 dwg
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