The vegetable greenhouse is an agricultural facility that is no longer limited to the natural environment for the development of the modern vegetable and fruit industry. Its development speed is very fast, but the initial investment is relatively large, which is dozens of times higher than the ordinary open field production investment. The service life of the greenhouse directly determines whether the production efficiency can meet the expectations, and the construction of the greenhouse must consider its usability. So what are the factors that affect vegetable greenhouses?
1. Light transmittance, the attenuation of light transmittance is a decisive factor affecting the service life of light-transmitting materials. Generally, the service life of the steel structure greenhouse is more than 15 years, and the load involving wind and snow loads is required to be used once in 25 years.
2. The use of materials and the quality of the materials used in the construction of vegetable greenhouses are the basic influencing factors, which directly affect the size of the load-bearing weight and the service life of the foundation. The load-bearing capacity of the design of the greenhouse frame is directly related to the reproduction period of the snow load and the snow load.
Introduction to the main structure of the plastic greenhouse
The main structure of the plastic greenhouse generally uses hot-dip galvanized steel pipe as the main bearing structure, factory production, and on-site installation. Since the plastic greenhouse is light in weight and has weak resistance to wind and snow loads, the overall stability of the structure must be fully considered. Generally, vertical diagonal braces should be installed in the indoor two-span or two-bay room, and the outside of the greenhouse The necessary space support should also be considered on the protective structure and the roof. Try to have diagonal supports (oblique tie rods) anchored to the foundation to form a spatial force system.
The main structure of the plastic greenhouse must have the ability to resist wind of at least level 8. Generally, the ability to resist wind is required to reach level 10.
The snow load carrying capacity of the main structure should be determined according to the actual snowfall conditions in the construction area and the winter usage of the greenhouse. For use in the north, the design snow load should not be less than 0.35kN/m².
