The scale of plastic multi-span greenhouse The overall length of a plastic multi-span greenhouse is generally 40-60 meters, and the longest is no more than 100 meters, which is too long and inconvenient to manage. The shed is 10-20 meters wide, and the tank is poorly ventilated. In the case of the same area and other conditions, the larger the span of the plastic multi-span greenhouse, the greater the heavy foot of the arch load, and the relative decrease in wind resistance. At the same time, it is also difficult for the shed top to pass through the nine sheds. The film is not easy to tighten, and it is easy to tear if it vibrates frequently. Conversely, the smaller the span of the shed, the denser the arches and the stronger the wind resistance. The ratio of the length to the width of the plastic multi-span greenhouse. For example, the length of the canopy is 100 meters, the width of the shed is 10 meters, and the ratio of width to length is 10/l00=0.1. Another example is that the length of the shed is 50 meters, and the width of the shed is 20 meters. The total ratio is 20/50=0.4. The greater the ratio, the greater the wind's gravitational force (or pulling force), so under the same conditions, the smaller the ratio, the stronger the wind resistance. At the same time, a greenhouse with a length of 100 meters and a width of 10 meters has a perimeter of 220 meters; a greenhouse with a length of 50 meters and a width of 20 meters has a perimeter of 140 meters. The two areas are equal, and the difference between the perimeter is about 0.6 times. If the margins are buried in the soil, the former one will be buried much more tightly, and the wind resistance will be relatively enhanced. When determining the length and width of the flail, the team should be designed according to the specific local conditions. The height of plastic multi-span greenhouses: for single-span greenhouses, the minimum height is generally 1.8-2.4 meters, the middle side height is 1.6-2.0 meters, and the side height is 1.3-1.5 meters. The higher the greenhouse, the greater the wind speed and pressure it will withstand. Therefore, the height of the plastic multi-span greenhouse is designed to meet the requirements of vegetable growth and facilitate operation and management, and it should be as short as possible to reduce wind damage.
