What Are The Types Of Polytunnel Greenhouses

From the analysis of the structure and construction materials of plastic greenhouses, there are mainly three types of plastic greenhouses that are used more and are more practical.

Bamboo and wood structure

The greenhouses of this structure vary from region to region, but the main parameters and shapes of the greenhouses are basically the same, with little differences.

The span of the greenhouse is 6-12 meters, the length is 30-60 meters, the shoulder height is 1-1.5 meters, and the ridge height is 1.8-2.5 meters; according to the width (span) of the shed, a column is set every 2 meters, and the column is thick 6-8 cm, form an arch at the top, bury the ground to a depth of 50 cm, pad bricks or tie a horizontal wood, tamp it, and fix the bamboo (rod) at the top of the column to form an arch, and add horizontal wood at both ends and bury it underground and tamp; The distance between the frames is 1 meter, and they are connected by longitudinal tie rods to form a whole; the arch frame is covered with a film, and the end of the film is buried in the surrounding soil between the arch frames. The advantage is that it is convenient to obtain materials, the cost is low, and the construction is easy; the disadvantage is that there are many pillars in the shed, the shading rate is high, the operation is inconvenient, the service life is short, and the resistance to wind and snow loads is poor.

Welded Steel Structure

For this kind of steel structure greenhouse, the arch is a flat truss made of steel bars, steel pipes or a combination of the two.

The span is 8-12 meters, the ridge height is 2.6-3 meters, the length is 30-60 meters, and the arch is 1-1.2 meters. The longitudinal arches are connected and fixed by tie rods or oblique tie rods to form a whole. The arch frame is covered with film, and after tensioning, it is laminated with a lamination wire or No. 8 lead wire, and the two ends are fixed on the ground anchor.

The greenhouse with this structure has a solid skeleton, no central column, large space in the shed, good light transmission, convenient operation, and is a relatively good facility. But this kind of skeleton is painted with paint to prevent rust. It needs to be painted once every 1-2 years, which is more troublesome. If it is well maintained, the service life can reach 6-7 years.

Galvanized steel pipe

The greenhouse frame of this structure, the arch rods, longitudinal tie rods, and end columns are all thin-walled steel pipes, which are connected with special fixtures to form a whole. All rods and fixtures are hot-dip galvanized and rust-proof. It has formed more than 20 series of standard and standardized products.

This kind of greenhouse has a span of 4 to 12 meters, a shoulder height of 1 to 1.8 meters, a ridge height of 2.5 to 3.2 meters, a length of 20 to 60 meters, and an arch spacing of 0.5 to 1 meters. Longitudinal rods (tubes) The connection is fixed as a whole. It can be used to roll film for ventilation, insulation curtain insulation, sunshade curtain for shading and cooling.

This kind of greenhouse is an assembled structure, which is easy to construct and can be disassembled and moved. The greenhouse has large space, less shading, and convenient operation; it is conducive to the growth of tussah; the components are anti-corrosion, high overall strength, strong ability to withstand wind and snow, and the service life can reach More than 15 years, it is the most advanced greenhouse structure. The following mainly introduces the structure, variety and installation of galvanized steel pipe prefabricated plastic greenhouse.