| 摘要 |
FIELD: agriculture. SUBSTANCE: greenhouse has carcass composed of sections, each section being formed of two arced tubes with plastic cover, tube joining device, supports and end cover. Plastic cover is made in the form continuous sleeve for forming double-layer cover. Arced tubes and self- widening spacers are located inside cover. Spacers are made in the form of spring-loaded tubular members equipped with tension retainers. Retaining device is made in the form of detachable plugs positioned on arced tubes and self- widening spacers fixed on plugs. Carcass sections are defined by at least two alternating modules. First module has rounding radius smaller than that of second module by value equal to diameter of arced tube, second module being arranged in overlapped relation with respect to first module. Such construction provides for constant tightening of plastic cover at temperature variations. On heating, second module with greater rounding radius increases overlapping by value equal to cover stretching value. On temperature reduction, cover shortens by fixed value by means of retainers and spring. EFFECT: reduced labor intensity, increased service life of greenhouse, simplified construction and reduced mounting, dismantling and operating costs. 3 cl, 4 dwg |
