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Technical requirements and methods for the construction of vegetable greenhouses
Facility agriculture has large output and good efficiency. It is a major direction for the development of modern agriculture. At the same time, it has high technology content, high technical requirements and more investment funds. Therefore, the risks and difficulties for the general farmers who want to participate are very high. Big. Therefore, experts from the engineering department of Shouguang Shengrong Greenhouse Engineering Co., Ltd. suggest that friends who are ready to engage in facility agriculture must be cautious. It is also a brief introduction to the large arch shed suitable for early spring and autumn use in the north or for the perennial use in the south: First, pay attention to the technical aspects. Some people always think that building a greenhouse is to keep warm, just pick it up. In fact, it is not necessary to receive the proper cultivation effect on a limited land. The scientific and technological content of building a greenhouse is not low.
In order to plant in early spring, it is generally necessary to build the skeleton in the first month, cover the plastic film, and prepare for the transplanting of early spring vegetables for the coming year. Because the greenhouse is a relatively fixed and long-term cultivation facility, it requires energy and financial resources. Therefore, planning must be carried out before construction, especially for large-scale, concentrated shed bases, and according to natural environmental conditions. The direction and layout of the greenhouse, the roads, ditches, pools, housing and other facilities in the base are scientifically and rationally arranged, so as to ensure convenient future production management and effective use of land, laying a foundation for high productivity and high efficiency.
Generally speaking, the transportation should be convenient, the terrain is flat, open, and the drainage is convenient. There are reservoirs, rivers or groundwaters, the terrain is high, the wind is sheltering from the sun, the groundwater level is below 0.5 meters, and the soil is deep and fertile. In addition, the direction of the greenhouse is also very important.
Generally, it is better to go north-south or slightly southwest. That is, the north and south are long sheds, and the things are wide. The distance between the east and west sheds is 0.8-2 meters, and there is a small ditch with a width of 30 cm or more in the middle. The distance between the north and south sheds is about 2-3 meters, which is used to dig water ditches, water supply pipes, and to construct roads. On the basis of normal production, the narrower the better, the higher the utilization rate of the land. Whether it is to build a steel structure or a bamboo-wood structure depends entirely on its own conditions. Steel structure greenhouses are made of steel pipes or other steel materials and are made into a shed with the shape of a round arch below. If there is a certain economic foundation, such a greenhouse can be built.
Generally, the single arch has a width of 10-18 meters and can be connected by multiple arches. The height of a single steel pipe shed is 2.6-3.5 meters high and the span is 10-18 meters. The length is not limited to 100-200 meters. The vents are 1.5-2 meters high and the steel pipes are 2-3 meters apart. Such specifications mainly consider the wind, snow and insulation properties of the greenhouse. The cost of a single steel shed is generally between 20-40 yuan per square meter. The sheds need to connect the side vents of a single shed to each other, and a vent is required at the top.
The sheds are generally used for scientific research activities or display effects, and the structure is complicated and the construction cost is high. It is recommended not to be used. The scaffolding has a service life of 10-15 years without disassembly.