The single span tunnel greenhouse is an arch-shaped, film-covered structure built for commercial nursery work and vegetable farming. The frame is hot-dip galvanized steel tube with a 200-275 g/m² double-sided zinc coating, covered by a 150-micron UV-resistant anti-drip polyethylene film. The continuous arch carries wind and snow load in compression rather than concentrating it at a ridge, and it gives more usable headroom across the width than a peaked design of the same span, which matters for nursery stock of mixed height. Components are pre-cut and bolted so the house goes up without on-site welding. Standard spans run from 6 to 12 meters, with lengths from 10 to 100 meters.
The single span tunnel greenhouse is an arch-shaped, film-covered structure built for commercial nursery work and vegetable farming. Its defining feature is the continuous arch: instead of a ridge that concentrates load at a single line, the curve carries wind and snow in compression right down to the ground anchors, and it opens up usable headroom across the full width of the house. For a nursery running stock of mixed height, that extra clearance is often the difference between a workable house and one that forces staff to duck.
The frame is fabricated from hot-dip galvanized steel tube and formed into arched hoops, then bolted to ground-anchored posts. The zinc coating is applied after fabrication, so the cut ends and bolt holes are protected as well as the tube body. The cover is a 150-micron UV-resistant anti-drip polyethylene film; the anti-drip additive stops condensation from beading on the underside and dropping onto young seedlings, which is where damping-off problems usually start.
Standard spans run from 6 to 12 meters and lengths from 10 to 100 meters. Because the tunnel is modular in length, additional bays bolt onto the existing frame, so a house can be extended later without replacing what is already standing. End walls, doors, roll-up side ventilation and film-locking channels are all part of the same component system.
Continuous arch structure – The curved profile distributes wind and snow load evenly across the whole span instead of concentrating it at a ridge, and it provides greater interior headroom across the width than a peaked frame of the same span.
Hot-dip galvanized steel frame – Steel tube with a 200-275 g/m² double-sided zinc coating, formed into arches and bolted to ground anchors. The coating is applied after fabrication, protecting the cut ends and bolt holes as well as the tube body.
UV-resistant anti-drip PE film – The 150-micron cover carries both UV stabilisation and anti-drip additive. Light transmission for single-layer film is typically in the 85-87% range, keeping photosynthesis active through winter without scorching the crop in summer.
Bolted, weld-free assembly – Pre-cut and pre-drilled components with bolted connections remove the need for on-site welding, so the house can be raised by farm staff using hand tools and the installation labour stays predictable.
Structural weather resistance – The arch profile and diagonal bracing are engineered for wind speeds up to 120 km/h and snow loads up to 25 kg/m². Where local codes demand more, additional purlins and heavier ground anchors can be specified.
Configurable sizing – Spans of 6 to 12 meters and lengths of 10 to 100 meters, with options for side-wall height, ventilation openings and door position.
Nursery and seedling propagation – Consistent germination temperature, protection from heavy rain and the extra headroom of the arch design make this a practical house for raising transplants. Where propagation is tray-based, it is commonly combined with a seed tray tunnel greenhouse setup and raised benches.
Tomato production – The house holds a warm, stable microclimate and the anti-drip film keeps the canopy dry, reducing the leaf-disease pressure that costs yield in open tomato growing.
Pepper and strawberry cultivation – Both are high-value crops where one weather event can end a season. The covered structure keeps rain, hail and wind off the fruit while still allowing good light.
Leafy greens and herbs – Lettuce, spinach and basil can be grown year-round, with the season extended at both ends in temperate and tropical regions alike.
Cut flowers and ornamentals – Diffused light under film reduces stress on young plants compared with direct sun.
Ziyang Bozong manufactures greenhouse frames and covering systems for export, specifying the steel structure and the film together rather than sourcing them separately. Compared with a glass or polycarbonate house, the PE film tunnel carries a substantially lower initial investment while still delivering a controlled growing environment, and the arch profile reaches that performance with less steel than a peaked structure of the same span.
Houses can be supplied as a frame only or as a complete package with film, end walls, doors and ventilation. Buyers who want a taller working height for trellised crops can look at our gothic arch high tunnel greenhouse, and growers who need a larger single unit for commercial output often move up to the commercial single-span tunnel greenhouse. The full tunnel greenhouse category covers span and length options across the range.
Delivery runs 20-30 working days depending on specification. Each shipment includes an installation manual with drawings, and optional on-site engineering support is available for larger projects. For background on protected cultivation and its role in food production, growers can refer to the FAO, with practical industry reporting available via Greenhouse Grower.
An arch has no ridge line, so wind and snow load is carried in compression and spread across the whole span rather than concentrated at a single joint. That lets the structure reach a given snow and wind rating with less steel, and it opens up headroom across the full width of the house instead of only at the centre. For nursery stock and trellised vegetable crops, where plants are worked on at height, the arch is usually the more practical shape.
Yes. The structure is modular in length, so additional bays bolt onto the existing frame and a house can be extended from 10 meters up to around 100 meters without replacing what is already standing. Span width is fixed once the hoops are formed, so if there is any chance the operation will need a wider house later, that is worth deciding at the quotation stage rather than afterwards.
The hot-dip galvanized steel frame is designed for a 15-20 year service life in normal agricultural environments, with a double-sided zinc coating of 200-275 g/m². Film covers are replaced every 3-5 years, while glass and PC panels carry their own manufacturer warranties.
The hot-dip galvanized steel frame carries a 10-year structural warranty covering structural safety, plus a 5-year warranty against corrosion perforation. It is designed for a 15-20 year service life. Film covers carry their own UV warranty depending on the grade selected, and we supply replacement covers and spare components throughout the life of the structure.
Please send the span width and length you have in mind, the crop you intend to grow, the local wind and snow load requirements, and whether you need a frame only or a complete package with film, end walls and ventilation. Tell us if the house is intended mainly for nursery propagation or for a fruiting crop, since that affects the side-wall height we would recommend. We will also need the destination port for the shipping quotation.
