In summer, there is more rainwater. In the production, the protection of the back wall of the shed should be strengthened. If the protection is improper, the wall will be washed away by rain for a long time, and there will be certain safety hazards. In serious cases, the wall will collapse.
Some vegetable farmers directly use the cement to build the back wall; some use non-woven fabrics to cover the back wall; some vegetable farmers also protect the back wall of the shed by stamping the rain film.
So which way is the effect?
Cover film rainproof
On the back wall of the shed, the most common is to cover the shed with the old film. The rain will flow down and not soak the shed, and the film can resist the strong wind and maintain good heat. However, the film ages quickly and is easily broken and damaged. Even if the layers are covered, the film may have holes, which may cause rain to wet the wall.
Precautions:
In response to the above problems, the vegetable farmers should pay special attention to the film selection and fixing. Before the heavy rain, always check the back wall covering film to ensure no water leakage.
Generally, anti-extrusion, that is, a film with better elasticity, is selected. Because the back wall of the greenhouse is relatively rough, if the elasticity is not good when it is pressed, it will easily cause cracking and rain leakage. The thickness of the selected rainproof film should also be guaranteed. It is not advisable to choose a thin film to make the back wall rain film. Purchase a suitable rain film based on the height and length of your greenhouse. In general, the width and length of the selected rain film are slightly larger than the height and length of the booth itself to facilitate fixing. At the same time, the upper part of the film should be fixed at the top of the back edge of the greenhouse, and the soil should be compacted after being stretched and flattened. The lower part is pressed against the bottom of the rear wall.
After the rainproof membrane is fixed up and down, in order to prevent the wind from being scratched, it can be compacted with bricks or other heavy objects at a certain distance on the membrane, and then the outer bottom of the rear wall is covered with corn stalks to fix the ground. It can reduce the visibility of the film and delay the aging of the film.
Covered with non-woven fabric
Many growers use non-woven fabrics to protect the curtains and the back wall. According to the vegetable grower, the back wall can effectively prevent rain after covering the film, but weeds often appear in the summer film. These weeds will support and even break the film, affecting its rainproof effect. The use of non-woven fabrics can be effectively waterproof, and can be shaded to prevent weed growth, and the effect is better.
However, some vegetable farmers said that when using non-woven fabrics for rain protection in summer, if the rainfall is large, the rainwater can still be oozing through the non-woven fabric to the wall of the shed, which will form a scouring effect on the wall, resulting in poor rainproof effect. The non-woven fabric is exposed to the sun and then exposed to the sun, which will greatly shorten the service life of the non-woven fabric.
ways to improve:
1 attach a film to the inside of the non-woven fabric;
2 Some farmers will add a layer of glue mixed with industrial glue and cement on the non-woven fabric. This layer of glue can be solidified quickly, which can effectively reduce the degree of rain and rain and reduce rain. The scouring of non-woven fabrics extends the service life and is also highly resistant to wind and fire. Note that when pouring the cement slurry onto the non-woven fabric, it should be carried out on a cloudy day, or after the sun falls on a sunny day, the temperature is low, and the evaporation of water is small, so that the water in the cement slurry evaporates slowly, so that the cement slurry is sufficient. The time penetrates into the perforations of the non-woven fabric and is joined into pieces to increase the solidification strength of the cement.
Cement board rainproof
In most nursery or seedling bases, after the shed is completed, the back wall is covered with cement or cement slabs and bricks, which can prevent high, and the vegetable farmers apply relatively little. This method of rain protection of cement board is the best, and the shed is reinforced again. This method can be used in areas with more rain.
Rear roof rain
The roof behind the greenhouse plays the role of carrying the weight of the curtain, and the insulation effect on the shed is also good. However, many of the vegetable farmers' rear roofs are in disrepair due to their long-term disrepair, and the internal fillings are rotted and the carrying capacity is reduced. Even the soil that caused the bottom of the post-pillar column collapsed, causing the rear roof to settle.
It is understood that the water leakage is usually caused by the low position of the roller shutter bracket on the rear roof, where water flows or flows through it to cause water ingress. Therefore, as long as the place is raised, there will be no water leakage problems.
The specific operation is: from the inside of the shed, the mulch film is inserted upward along the inner corner of the triangular iron, and the film covered by the outer covering is bulged, so that the water flow does not gather or flow there, thereby reducing the chance of water entering. Since the right angle of the triangle iron faces downward, when it rains, it will not cause rainwater to accumulate due to the blockage, so that the rain will not enter the rear roof. Use a cement column to raise the film around the column, then seal it with tape, or cover several layers of film around the column and stick it.
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