In the early morning of April 1, Daxie in Shaanxi Province continued to experience windy weather. The maximum wind speed was 22m/s in the maximum moment, the average wind power was 5-7 grades, and the local wind power reached 7 or more. The windy weather had a great impact on the county's facilities industry. Caused the county's affected area of ​​more than 100,000 acres and direct economic losses of 119 million yuan.
Through several days of investigations, the author believes that strong winds are the main cause of damage to the sheds. However, there are still some problems in terms of the construction quality and structure of the sheds, which are mainly reflected in the simple construction of the vegetable sheds, and the construction of bamboo sheds and old sheds. The area is large; part of the laminated film is not firm in the winter shed, and the wind outlet is not closed in time or the bottom wind convection is not smooth. Some of the sheds spanning more than 10 meters have no bearing beam. The steel beam used is not thick enough and the compressive strength is not enough. And was blown by the wind. It is suggested that farmer friends do the following in the future:
One is that the small bamboo sheds have been converted into steel frame structures or steel-plastic structure sheds, generally spanning 6-12 meters, with a ridge height of 2.4-3.5 meters and a length of 80-120 meters. The steel pipe is a galvanized steel pipe with a diameter of 30 mm and a wall thickness of 1.8 mm.
The second is that there must be pillars in a greenhouse with a height of more than 10 meters. The distance between the columns should be 3-5 meters. A load-bearing beam should be added to the steel frame 5 meters. The materials used for the columns and the load-bearing beams are stainless steel pipes with a diameter of 50 mm.
The third is whether the steel beam foundation is poured or directly inserted into the ground. The depth must be more than 30 cm. At the same time, the rope anchor must be buried deep and firmly buried.
Fourth, it is recommended that the jujube film be changed in 2 years. The thickness is 0.08mm-0.10mm. The melon vegetable shed is changed every year, and the film thickness is 0.06mm-0.08mm. It must be purchased from the regular channels to improve the wind resistance performance of the large film.
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