| 摘要 |
FIELD: agriculture. SUBSTANCE: greenhouse has film cover, carcass made in the form of polygon, and end walls with glazed frames or frames covered with film. End walls are made as polygons inscribed into circle or oval and connected with one another through spans, which, depending upon greenhouse length or rigidity of angular profile, are stiffened from flexure by intermediate arced members. Door box is positioned on front end wall, ventilation opening is positioned on rear end wall. Brackets are welded from internal side to apexes of polygon for attachment of spans. Clips are fixed on two lower spans for attachment of film webs. Film webs, except for film cover on end walls mounted on foundation, are attached only at their lower parts on two lower spans. EFFECT: enhanced reliability in protecting from wind load, prolonged service life of film cover and increased efficiency. 18 cl, 10 dwg |
