CROP 06 · STRUCTURE NOTES
Blueberries want acid soil, netted tunnels and a structure that can be moved.
Blueberry production uses tunnels less for winter heat than for rain protection, bird net and harvest timing. The frame is light, the covering is net or film, and the anchor detail dominates.
In rain-sensitive berry regions the tunnel's job is to keep water off the fruit during ripening. That changes the design priorities: the cover has to be intact, the sides have to open for pollination and harvest, and the structure has to survive wind when the sides are open — the worst case, not the closed one.
| Priority | Structural effect |
|---|---|
| Rain protection | continuous cover, gutter or ground return |
| Pollination access | side roll-up height |
| Bird net | net support and fixing points |
| Wind with sides open | bracing and anchors |
| Movability | ground screws, not concrete |
Movable structures are a real category: growers relocate tunnels between blocks. Ground screws instead of concrete make that possible and make the anchor the wear item. We quote anchor quantity per leg rather than a lump sum.
The open-side case
A tunnel with both sides rolled up presents a very different wind load from a closed one. Tell your engineer which configuration is normal in harvest, not which is normal in winter.
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