First of all, it is necessary to reinforce the columns, replace the old bamboo baskets, and put on a good film. The tightness of the upper film and the setting of the vents have a great influence on the wind resistance. When the film is selected, there should be no wind and fine weather. It must be tightened and then on, so the film cannot be loosened. Pay attention to the setting of vents on the membrane. The overlap of the two membranes is preferably between 25 and 30 centimeters to ensure the tightness of the arch. It should not be too wide, so as not to affect the ventilation and the temperature of the greenhouse when the temperature is high; nor can it be too narrow. In case of strong winds, the ventilation openings are not strict, and the wind blows into the shed to encourage the shed film to be more destructive.
Second, we must do a good job of windproof work in key areas. If there are tall objects such as houses, trees, etc. near the arch sheds, strong winds will cause cyclones or turbulence due to the obstruction of these objects. Especially when these objects are in the south direction of the arch, the swirling airflow is blocked and then descends through the shed. The gap on the south side enters the shed, resulting in inconsistent air pressure in the shed, which may cause the film to be broken. It is suggested that when there are tall objects near the arch shed, the number of membrane ropes should be increased. Double membranes should be installed at the entrance, and the entrance and exit of the arch shed should be sealed tightly to prevent the air flow from entering.
Finally, pay attention to the inspection during the strong winds. High winds will agitate the shed film. If the ventilation openings are not properly set, they may be scratched, causing pressure fluctuations in the shed and affecting the structure of the shed. In particular, arch sheds with small shed angles and high sides have a greater resistance to wind. If air vents are not strict, the pressure inside and outside the shed will be different when the airflow passes through the shed, and the shed film will be broken. Severe problems may occur. Caused the entire arch to collapse. For such a shed, attention should be paid to strengthening the bearing capacity of the columns on both sides, increasing the number of membrane ropes on the sheds, shutting off the vents strictly, and improving the wind resistance of the shed body.
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