Building short back slope high back wall po film greenhouses should pay attention to the problem

The key difference between short back slope and high back wall sunlight greenhouse and low back wall and long back roof greenhouse is to increase the height to width ratio of back wall and reduce the length of back roof. The natural environment and sunlight exposure of this kind of greenhouse is much improved than that of the previous greenhouse, and it is a greenhouse with a larger total area of production and manufacturing use at this stage. At this stage, the key choice is po film as a covering material. This type of greenhouse built all over the country because of the sampling and geographical environmental standards are not the same, its structure and specifications are also different. The span of the greenhouse is 6.5~7.5 meters, the ridge is 2.8~3.5 meters, and the rear wall is 1.6~2. Two meters. The rear slope is 1.5~1.7 meters long, the rear house elevation is above 35°, the rear house slope is 1.2~1.5 meters wide in the horizontal projection of the road, and the rear wall is 0.8~1.0 meters thick. There are many kinds of wall materials and wall structures, the most common is earth walls, which can save the cost of wall materials, but must be trimmed after more rain every year. In addition to the earth wall, the development trend of brick wall is rapid, and the back wall and the gables on both sides are completed hollow walls. The two sides are 24 cm thick walls, the inner side is 12CM thick walls, and the middle gap is filled with colored stone and other thermal insulation materials. Some also complete the wall with a solid core wall of 30 centimeters or 24 centimeters thick, and then pile earth on both sides of the wall for heat insulation, or first hit the earth wall, and then build 12CM thick walls on both sides of the earth wall, so as to maintain the earth wall will not be eroded by rain, eliminating the work of renovation every year.

In addition to the raw materials of the long back roof, cement prefabricated panels can also be selected for the construction of the roof after the sunshine temperature, and ring beams can be added to the back wall, and the back roof pipe can be smoothed with coal ash.

The raw materials for the frame construction of the front lighting surface can be selected as bamboo and wood structure, steel frame structure bamboo mixed structure and steel frame.

(1) Bamboo and wood structure building

The light surface frame of this po film greenhouse must be set up with two columns, and the spacing between the poles is generally 3 meters; Vertical rod tracing bearing beam; An arched circular lighting surface is made of bamboo slices or bamboo poles, which are fixed on the load-bearing beams; The spacing of bamboo pieces or bamboo poles is generally 50 to 60 cm.

(2) Steel frame structure and bamboo structure

A curved building steel truss structure is installed every 3 meters over the lighting surface, and the truss structure is connected to the rear roof. According to the lower chord of the truss structure along the direction of the article through 5 to 7 thin wire. Between the two rows of curved truss structure, 5 bamboo pieces are constructed to make an arched ring lighting surface, and the bamboo pieces are connected to the thin iron wire with short stick support points.

(3) Steel frame

This kind of technical standards with the steel frame structure bamboo mixed structure type, only the construction of raw materials all the application of stainless steel sheet.

This kind of po film greenhouse has a long back slope and a low back wall sunlight greenhouse has a slightly poor thermal insulation and insulation, but because the front slope is extended in the overall design, the back slope is reduced, the ridge height is raised, and the lighting roof is increased, the sunlight exposure standard in the greenhouse is greatly improved, and the heating is rapid on sunny days. There is only one row of middle column in this kind of structural greenhouse, no waist column and front column, convenient work in the greenhouse, and high utilization rate of farmland.