Stress characteristics and structure characteristics of Venlo type greenhouse
The Venlo-type greenhouse adopts a typical purlin-free roof system. The load borne by the glass directly acts on the longitudinal gutter of the greenhouse, and the gutter transmits the force directly to the columns or roof beam nodes. Therefore, the gutter bears the uniform force from the roof system and the concentrated load of maintenance, etc., and the external force borne by the roof beam is mainly from the concentrated force on some nodes and other equipment on the suspension truss from the gutter. load etc.
The most important feature of Venlo type greenhouse is small component cross-section, simple installation, long service life and easy maintenance. The relevant parameters are as follows. Structural unit span: 6.40m, 8.0m, 9.60m, 10.8m, 12.0m, etc. Roof unit span: 3.20m, 3.6m, 4.0m. Standard roof height: about 0.80m. Common greenhouse eaves height: 3.00m, 3.50m, 4.00m, 4.50m, 5.0m, 6.00m, etc.
In terms of its structural materials, the Venlo-type greenhouse columns and side beams are made of hot-dip galvanized light steel structure; the roof beams are made of horizontal hot-dip galvanized truss structure; The beam adopts galvanized steel gutter or aluminum alloy gutter with relatively small section; the roof lighting material is 4mm or 5mm thick tempered glass, and the surrounding is 5mm single-layer glass or 5+9a+5mm double-layer insulating glass, and the surrounding glass Can be tempered or not tempered. The foundation usually adopts reinforced concrete independent foundation, and the surrounding side walls are maintained with brick walls.
