This project is located in Honggang District, Daqing City, Heilongjiang Province. The site is situated within an alluvial landform unit—specifically the Songhua River alluvial plain in the central Songnen Plain. It is characterized by uniform topography, minimal undulation, and an open, flat layout free from obstructions such as nearby buildings. Solar energy resources are evenly distributed across the area. The land consists of saline-alkali soil, making it suitable for the construction of a ground-mounted photovoltaic power station.

The planned site covers a total area of approximately 550,000 m², with elevations ranging from 146.8 m to 147.2 m. The project has a planned total capacity of 20 MWp, utilizing 270 Wp polycrystalline silicon modules. The projected average annual power generation is 24,823,000 kWh, with an equivalent annual utilization of 1,241.2 hours.

The site’s seismic fortification intensity is Grade 6, with a design earthquake grouping of Group I, a design basic seismic acceleration of 0.05g, and a characteristic period of the seismic response spectrum of 0.45s. The site soil ranges from soft to medium-hard and is classified as Category III construction ground. Structural calculations are based on a basic wind pressure of 0.55 kN/m² and a basic snow pressure of 0.30 kN/m². The main structure is designed for a service life of 25 years, with a safety class of Grade III and a structural importance coefficient of 1.0.

The cross-sectional view of the photovoltaic module mounting structure is shown above. The primary components consist of C-section steel and rectangular (or square) hollow structural sections. Specifically, the purlins and inclined beams are made of C-section steel (purlins: C100×50×20×2; inclined beams: C80×45×10×2.5). The supports utilize rectangular (or square) hollow sections (intermediate support: 120×80×3; long and short inclined supports: 40×40×2).

The steel consumption for a single photovoltaic module array mounting structure is approximately 7 kg/m². All steel components are fabricated from Q235 steel. With the exception of the intermediate support, which is connected to the precast pipe pile end plate via welding, all other components are joined using bolted connections.

This project is located in Linze County, Gansu Province, where a modular solar greenhouse featuring a steel-frame structure and walls made of color-coated steel sheets has been developed. The design utilizes thermal insulation blankets and double-sided color-coated steel panels to form the insulated walls and rear roof, while employing water—rather than traditional heat-storage media like brick, soil, or sand/gravel—to store heat. The structure is easy to assemble and disassemble, labor-efficient, and highly resistant to wind and compressive loads. Compared to a traditional solar greenhouse of the same size, construction costs are reduced by 17,300 RMB. It is suitable for year-round horticultural crop production and intensive seedling cultivation in the Hexi Corridor and Northwest China. 

The span is 9 meters, while the length depends on the terrain (typically 60–70 meters is optimal).

●Prefabricated concrete (Grade 200) ring beams are used around the perimeter.

●The front ring beam (featuring embedded parts every 1 meter to secure the steel ring beam) measures 0.3 m in height and 0.3 m in width.

●The rear ring beam (featuring embedded parts every 2 meters to secure the vertical posts) measures 0.3 m in height and 0.8 m in width.

1.The framework and steel ring beams consist of 3 cm × 7.8 cm rectangular steel tubing.

2.The framework material is national-standard galvanized steel sheet, cold-bent into the greenhouse profile.

3.Fixed tie rods are galvanized pipes with a 20 mm diameter.

4.Rear vertical posts are national-standard galvanized steel pipes with a 110 mm diameter.

5.Support piles are 30 cm long, made of angle iron (50 mm and 32 mm leg widths, 4 mm thickness).

6.Front vertical posts are 2 m long, made of rectangular steel tubing (400 mm length, 25 mm width, 6 mm thickness).

7.Rear vertical posts are 0.8 m long, made of rectangular steel tubing (3 cm length, 7.8 cm width, 2.75 mm thickness).

8.Front vertical support posts use national-standard galvanized steel pipes with a 75 mm diameter.

●The ridge height is 3.8 m.

●Front roof length is 10.5 m.

●Rear roof length is 2.45 m.

●Rear column height is 2.3 m with 2 m spacing.

●Steel ring beams run twice the length of the greenhouse and are installed and secured atop both the rear columns and the front ring beam.

●Front and rear roof frameworks are connected with 1 m spacing.

●Nine horizontal tie rods span the length of the greenhouse.

●Eight support posts are installed per gable end (16 total across both sides).

●Front columns are 4 m long with 8 m spacing, connecting at the top to the framework.

●Insulation blankets for the columns (rear wall) and rear roof are 5 m wide, span the greenhouse length, and are 10 cm thick (2 layers).

●Straw mats combined with insulation blankets are used on both gable ends.

●The front roof is covered with 10 m wide, 1.2 mm thick EVA (ethylene-vinyl acetate) film.

●The ventilation opening film is 2 m wide.

●The main greenhouse film is 1 m longer than the greenhouse itself.

●The front roof insulation blanket is 11 m long and 5 cm thick, operated by a rolling mechanism for deployment and retraction.

●Double-sided color steel panels with a high-density polystyrene (EPS) core are used for the insulated wall and rear roof.

●The EPS core is 10–12 cm thick, high-density, and flame-retardant.

●The color steel facing is 5 mm thick on each side.

●The rear wall is 2.2 m high, and the rear roof section is 2.6 m long.

Black PVC piping with a 17 cm diameter and 0.5 cm wall thickness is used.

This large-scale Venlo-style light-gauge steel greenhouse is located in a modern agricultural demonstration park in Sichuan Province and currently stands as the largest glass greenhouse structure for vegetable cultivation in Western China.

The project was constructed based on advanced integrated agricultural technologies imported from the Netherlands.

The structure measures 320.41 m in length and 235.57 m in width, covering an area of approximately 75,000 m².

It utilizes a continuous multi-span light-gauge portal frame system.

Along the longitudinal axis, the primary planar load-bearing system consists of 38 portal frames with an 8 m span and two with an 8.205 m span.

Along the transverse axis, a system of tie rods and flexible bracing integrates 46 independent multi-span portal frames into a unified spatial structure.

The plan layout of the greenhouse structure is shown in the figure above.

The chords of the light-gauge truss beams are composed of S275-grade rectangular hollow sections (RHS) measuring 60×30×2.0 mm.

The web members consist of 25×25×2.0 mm square hollow sections (SHS).

The portal frame columns are made of Q235-grade RHS measuring 140×60×3.0/4.0/5.0 mm.

Other secondary structural components include Q235-grade roof purlins (120×60×5.0 mm), HRB500-grade flexible bracing (Φ10 mm) for the roof and inter-column spaces, and Q235-grade inter-column tie rods (50×50×2.0 mm).

The column bases are connected to independent cylindrical reinforced concrete foundations via pinned joints using standard M8 through-bolts, with a maximum foundation embedment depth of 1.6 m.

The figure below shows the details of the connection assembly.