We are now almost inseparable from greenhouses for growing crops. Greenhouses can not only withstand natural disasters and drought and floods, but also cultivate early or postponed cultivation, extend the growth period of crops, and achieve the objectives of early maturity, late maturity, and increased and stable yield. Popular with farmers. Due to the different climates and applications in different places, the specifications of greenhouses are also different. China glass greenhouse manufacturer introduces the most common types of greenhouses to help you choose a suitable greenhouse.
1: plastic greenhouse
Large-scale multi-story plastic greenhouses are a type of greenhouse that has emerged and developed rapidly in recent decades. Compared with glass greenhouses, it has the advantages of light weight, small amount of framework materials, low shading rate of structural parts, low cost, and long service life. Its environmental regulation ability can basically reach the same level as glass greenhouses. The capacity is far higher than glass greenhouses worldwide, and has become the mainstream of modern greenhouse development.
Agricultural glass greenhouse is a greenhouse with glass as a transparent covering material. In foundation design, in addition to meeting the strength requirements, it should also have sufficient stability and ability to resist uneven settlement. The foundation connected to the support between columns should also have sufficient horizontal force transmission and spatial stability.
The bottom of the greenhouse should be below the frozen soil layer. The heating greenhouse can consider the impact of heating on the freezing depth of the foundation according to the climate and soil conditions. Generally, the bottom of the foundation should be more than 0.5 meters below the outdoor ground, and the distance between the top of the foundation and the outdoor ground should be greater than 0.1 meters to prevent the foundation from being exposed and adversely affecting cultivation. Except for special requirements, the distance between the top surface of the greenhouse foundation and the indoor floor should be greater than 0.4 meters.
3. Solar greenhouse
The front slope is covered with heat insulation at night, and the east, west, and north sides are single-slope plastic greenhouses that are enclosing walls, collectively referred to as sunlight greenhouses. Its prototype is a single-slope glass greenhouse, and the front-slope light-transmissive covering material has been replaced by a plastic film to form an early sunlight greenhouse. Solar greenhouses are characterized by good thermal insulation, low investment, and energy conservation, and are very suitable for use in less developed rural areas of our country.
Single Span Greenhouse
4. Plastic greenhouse
The plastic greenhouse is an unheated, single-span arch roof structure greenhouse with plastic film as the covering material. The plastic greenhouse is easy to construct, easy to use, and requires less investment. It is a simple protected cultivation facility. With the development of the plastic industry, it has been widely adopted by countries around the world.
Plastic greenhouses are generally not heated indoors, relying on the greenhouse effect to accumulate heat. The lowest temperature is generally 1 ~ 2 ℃ higher than the outdoor temperature, and the average temperature is higher than 3 ~ 10 ℃.
The light transmittance of plastic greenhouses is generally 60% ~ 75%. In order to ensure the basic balance of the average light throughout the day, the layout of the greenhouse is mostly extended from north to south.
Use circular arched shed: The basic requirements are a shed width of 8 meters, a shed length of 30 meters, a shoulder height of 1.8 meters, and a top height of 3 meters. Above 0.4m. The material is made of hot-dip galvanized steel, and 3 longitudinal tie bars are designed to enhance the wind and pressure resistance; 4 longitudinal film-pressing grooves (2 grooves on each side) are designed. The skirt film is 40cm high, and the upper side is fixed with a film pressing groove, and the lower side is buried in the soil to enhance wind resistance and sealing. The second pass is installed 140cm off the ground, and the roll film and the skirt film repeat 30cm. 6 vertical poles are installed at the ends; a film pressing rope is installed between each two arches to increase the wind resistance, and windproof braces are installed at the four corners of the shed to increase the stability of the shed. 1 座 double-sided sliding door is installed on the end face of each shed. The door size is 1.8 × 1.4m, and each seat has a total of 2
Greenhouses can make full use of solar energy, have a certain thermal insulation effect, and adjust the temperature and humidity in the sheds within a certain range through the roll film. The greenhouse is in the northern region: it mainly plays the role of heat preservation cultivation in early spring and late autumn. It can be 30 to 50 days earlier in spring and 20 to 25 days in autumn. Wintering cultivation cannot be performed. In the southern region: In addition to the heat preservation of vegetables and flowers and winter cultivation (leafy vegetables) in the winter and spring seasons, it can also be replaced with a awning for shading and cooling, rain, wind, and hail prevention in the summer and autumn.