Flower crops are sold by the tray and the stem, so the house that carries them is judged on airflow and on how quickly a bench can be cleared. This tunnel is a kit: base rails, arches, purlins, roll-up side walls and end vent frames, on 2 mm galvanized pipe with factory-welded connections so nothing is drilled on site. It ships as palletised bundles and is aimed at growers running several identical houses rather than one bespoke building, where a spare arch set covers the whole range and a storm repair comes from stock.
Bedding plants and cut flowers are grown close together and sold fast, which puts two demands on a house: air has to move through dense foliage, and the whole crop has to be reachable in a single round. A tunnel with roll-up sides and open ends does both without machinery. This house sits in the tunnel greenhouse range on this site.
Flower crops are usually grown on the floor in trays or in beds, not up a string, so the working height matters less than the width of the path and the reach to the outer rows. A single span keeps the whole floor visible from the door, which is why market gardens and bedding plant nurseries tend to stay with single spans even when a multi span would cost less per square metre.
The arches are 2 mm wall galvanized pipe with connections welded in the factory, so the site work is bolting rather than drilling. That is a corrosion decision as much as a labour one: a hole drilled on site leaves bare steel inside the tube, and tubes rust from the inside out.
Pipe is supplied pre-galvanized at 5 to 25 micron of zinc, or hot dip galvanized at 35 to 200 micron. The difference is the environment the house is going into. A dry inland site and a coastal site do not need the same coating, and the quotation should say which one is being priced. A house supplied as a complete kit with a different frame detail is described on the single span nursery tunnel page.
| Structure | Single span steel frame tunnel, factory welded connections |
| Pipe wall | 2 mm |
| Pipe outside diameter | 21.3 mm to 114.3 mm, or to order |
| Pre-galvanized coating | 5 to 25 micron zinc |
| Hot dip coating | 35 to 200 micron zinc |
| Steel grade | Q235 / Q345 / S235JR / S275JR |
| Pipe standard | EN 10219, JIS G3444, ASTM A53, GB/T 3091 |
| Side walls | Roll up film, both sides |
| Ends | Vent frames included |
| Packing | Flat packed bundles on pallets |
The kit is base rails, arches, purlins, roll-up side walls and end vent frames, plus the clamps and fixings that hold them. The film is quoted with the house. What is not in the box is a crew, a level and a calm afternoon for the cover, and those three matter more to the finish than any single part.
Buying a kit is also about the second and third house. Identical parts mean one spare arch set covers the whole range, and a house damaged in a storm is repaired from stock rather than from a drawing. A heavier coated hoop house kit with side vents is described on the 275 g zinc coat hoop house kit page.
Ventilation on this house works at the perimeter: roll-up sides along both walls and vent frames at the ends. For flowering crops that arrangement is useful because it moves air across the whole bench rather than down the ridge, and the end vents give a through draught along the length when both are open.
The practical limit is wind. On an exposed site the sides are opened on the leeward wall first, and the end vents are used to trim the temperature rather than to dump the air. Industry representation for growers is published by AIPH, and fresh produce and floral trade reporting by Perishable News.
The frame goes up on a levelled base in a fixed order: arches to base rail, purlins, bracing, then film, then side walls and end frames. Because the connections are factory welded, there is no drilling and no site hot work. The maintenance list is short: check the base fixings after the first winter, replace the film on its cycle, and touch up any scratch on the coating before it blooms.
Ziyang Bozong Greenhouse Industry Co., Ltd. is a manufacturer based in Ziyang, Sichuan, China. We produce the hot-dip galvanized steel frame in-house, cutting and drilling to drawing, and supply covering materials, ventilation, cooling and irrigation systems as one coordinated package.
Send your growing area, span and length, crop type and local climate. If you already have a layout drawing, that is enough to start. Our engineers then return a quotation with a structure drawing and a bill of materials.
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.
Yes. We customize span width, bay length, gutter height, covering material (film, PC sheet or glass) and ventilation configuration. Share your crop type, local climate and growing area, and our engineers will size the structure to match.
Base rails, arches, purlins, roll-up side walls and end vent frames, with the clamps and fixings. The cover film is quoted with the house, and the drawing set comes in the bundle so the crew works from the same numbers as the factory.
Pipe from 21.3 to 114.3 mm outside diameter, pre-galvanized at 5 to 25 micron zinc or hot dip galvanized at 35 to 200 micron, in Q235, Q345, S235JR or S275JR, to EN 10219, JIS G3444, ASTM A53 or GB/T 3091. The coating grade should match the site, not the budget.
