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In the survey, the author learned that some high-standard greenhouses only used 1 to 2 years before the collapse of the back wall, so that farmers are very worried. Then, as the shed grows and builds, the wider it is, the wider it will be. What should be noticed in the construction of the back wall? How to maintain it? Here, we will do some analysis from the following aspects, hoping to help the vegetable farmers.
To build a foundation before construction When the author interviewed him in the countryside, many vegetable farmers reported that the bottom of the back wall was easily collapsed during construction. The reason for this was that the farmers were building the back wall of the greenhouse. In the above, only the compaction of the back wall of the ground was emphasized and the compaction of the base of the back wall was neglected. How can the vegetable growers compact the back wall of the greenhouse? For greenhouses with a width of 12 to 14 meters and a length of 80 meters or more, the depth of digging is generally about 1 meter. This way, when the peasants construct a shed, they must first do the following two tasks:
First, water the plots that are intended to be built. The purpose of doing so is to increase the moisture content of the soil and facilitate compaction of the foundation when building the shed. After the watering of the vegetable growers, when the water content in the soil reaches the grip and they fall into the ground, the excavator or chain car is repeatedly compacted at the place where the wall of the greenhouse is to be built. Practice has shown that the watering is preceded by the use of an excavator or chain truck to compact the foundation. The back wall base is dense and not easy to collapse.
Secondly, in the use of a chain truck, the width of the compacted foundation is about 3 meters wider than the thickness of the back wall after construction. It is particularly necessary to press it to a distance of about 2 meters from the front of the wall after construction. This is a precaution. The compactness of the back wall is small, and the important measures for collapse later when the wall is cut. In addition, doing so can also allow farmers to build the back wall of the greenhouse, to facilitate the subsequent compaction of the wall, such as the completion of the bottom of the width of about 6 meters of the wall, the backing of the vegetable farmers in the construction of the back wall needs to be about 9 meters, with The height of the back wall is increased, and the back wall is narrowed so that when it reaches the top of the back wall, the chain car can also be compacted on the back wall.
For greenhouses with small construction spans and real species less than 10 meters, because the amount of back wall is large, the depth of digging is about 1.5 meters. If the vegetable growers construct the back wall of the greenhouse according to the above method, it is not suitable because of the chain rails. The compacted thickness of the car is less than one meter. Therefore, the vegetable farmer should also dig about 70 centimeters from the base trough, and then compact it. Then, the soil should be backfilled and compacted again to compact the foundation of the greenhouse to prevent collapse. .
According to the span's rational determination of the height of the back wall when interviewed in rural areas, the author found that many vegetable farmers had increased the planting area of ​​vegetable greenhouses and improved the land utilization rate. The wider the building, the wider the building, but did not properly increase the height of the back wall of the greenhouse. As a result, the lighting angle of the greenhouse was affected. As the saying goes, "The span determines the height." Therefore, when building a shed, vegetable growers must determine the height of the shed wall according to the span of the greenhouse. So how tall is the back wall of a greenhouse?
In general, the latitude at which the shed is constructed determines the daylighting roof angle of the greenhouse. With a certain degree of roof angle, the span of the shed determines the height of the shed. Like a greenhouse with a span of about 12-14 meters, the highest point of the greenhouse is between 5.3 meters and 5.5 meters above the ground. However, because the greenhouse is about to be cut at a depth of about 80 centimeters when it is built, the rear roof angle is set by the farmers. At about 45 degrees, that is, when the slope is set, the height of 70-80 cm is also increased because the purlins are inclined upwards. In this way, when the peasants construct the shed, they only need to set the height of the back wall to about 3.7 meters. Of course, when a vegetable farmer constructs a greenhouse, if the span of the greenhouse is smaller, the deeper the soil in the greenhouse is, the lower the height of the back wall of the greenhouse will be. However, from the point of view of the load-bearing capacity of the greenhouse and its ability to resist natural disasters and rationally increase land utilization, the construction width of the greenhouse is between 12 and 15 meters, which means that the height of the back wall of the greenhouse is 3.5 to 3.8. Rice can be. (on)
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How to Build a Stronger Back Wall
In recent years, new sheds have been built, and the sheds have been taller and wider. There is no pillar to build sheds, because they not only significantly increase the temperature and light performance of greenhouses, but also significantly increase land utilization. However, the higher the height of the shed, the higher the stability and stability requirements of the wall in the construction of the shed. In particular, the load-bearing capacity of the back wall directly affects the service life of high-standard sheds.