Multibay tunnels (Multibay) — bays on shared legs with gutters
A multibay tunnel is several bays joined side by side on shared rows of Y-legs screwed into the soil, with gutters between the bays. It comes out cheaper per m² than single tunnels: Multibay tunnels: from 23 zł/m² net.
Net, steel structure with film, excluding transport and installation. Assembly: from 8 zł/m² net.
- from 23 zł/m² net per m², with film, excluding transport and assembly
- 90×50 mm oval hoop tube (+29%)
- E370+Z275 leg steel
- 3 years warranty on the film
What a multibay tunnel is for
We design multibay tunnels for professional crops at a large scale, where strength, stability and the cost per square metre matter. The structure extends the season — from late autumn, through winter, to early spring — and the gutters between the bays collect rainwater that can be reused.
- Lower cost per m²
- Shared legs for neighbouring bays — multibay tunnels are cheaper than single ones on the same area.
- Oval tube
- Hoops from oval tube 80×40 or 90×50 mm are stiffer than from round tube; 90×50 is +29% strength at a similar price.
- Gutters and rainwater
- A built-in gutter system between the bays lets you collect rainwater and reuse it.
- Modular extension
- The block can be extended with further bays as the crop area grows.
Technical specification
Y-legs
A Y-leg has a Y-shaped connector welded at the top for the hoop — for round and oval tubes. We screw the legs into the soil, without foundations. Steel E370+Z275. The Ø40 mm leg fits round Ø40 mm hoops only.
| Leg diameter | Length | Fits hoops |
|---|---|---|
| Ø40 mm | 2.5–3.5 m | round Ø40 mm only |
| Ø50.8 mm | 2.5–3.5 m | round Ø50.8 and Ø60.3 mm; oval 80×40 and 90×50 mm |
| Ø60.3 mm | 2.5–3.5 m | round Ø50.8 and Ø60.3 mm; oval 80×40 and 90×50 mm |
Hoop tubes
Hoops in a round or gothic shape, from S350+Z275 steel.
| Profile | Size | Use |
|---|---|---|
| round | Ø40 mm | light seasonal tunnels |
| round | Ø50.8 mm | standard for agricultural tunnels of medium load capacity |
| round | Ø60.3 mm | reinforced year-round tunnels of large span |
| oval | 80×40 mm | the most popular solution — high stability at a moderate weight |
| oval | 90×50 mm | +29% strength at a very similar price |
Shape, gutters, film
| Parameter | Value |
|---|---|
| Arch shape | round or gothic |
| Bay width | 6–11 m |
| Gutters | between the bays, with rainwater collection |
| Film | single, 150–200 µm; 3-year warranty on the film |
Reinforcements against wind and snow
In multibay tunnels we fit lattice cables as standard on every hoop. You add the ridge tube and horizontal bracing as an option.
Standard
Lattice cables
3 mm steel cables run from the Y-leg to the hoop and form a spider-web net inside the tunnel.
They hold the tunnel in the wind and partly relieve it under snow.
Lattice cables: parametry Material 3 mm steel cable Fitting from Y-leg to hoop, on every hoop Protects against wind, partly snow 
Option · often chosen
Ridge tube
The tube runs the full length of the tunnel, 20 or 40 cm below the peak of the hoops.
It stiffens the tunnel from above and stops the arches from spreading.
Ridge tube: parametry Tube Ø35×1.5 mm Position 20 or 40 cm below the peak, along the full length of the tunnel Protects against spreading of the arches 
Option
T or V horizontal bracing
A horizontal tube joins both sides of the arch. Together with the hoop it forms a truss.
It strengthens the tunnel most against snow.
- T
- a vertical tube from the horizontal bracing to the hoop
- V
- two short diagonal braces, left and right, from the horizontal bracing to the hoop (in the drawing)
T or V horizontal bracing: parametry Horizontal bracing Ø40×1.5 mm tube, length 4–7 m depending on bay width T and V members Ø35×1.5 mm tube Fitting on every hoop Protects against snow
Strongest combination in multibay tunnels
Lattice cables + horizontal bracing
Best in a T or V variant — both are similarly effective. The cables hold the tunnel in the wind, and the bracing together with the hoop forms a truss that carries the snow.
Stronger steel at the same price
We have manufactured steel structures since 1995. We state the specifications plainly — just as in the offer.
E370+Z275
Y-legs and ground anchors in stronger steel
E370+Z275 steel is c. 10% stronger than classic S350+Z275 — and it costs you the same.
| Y-legs | E370+Z275 |
|---|---|
| Ground anchors | E370+Z275 |
| Hoops | S350+Z275 |
- 90×50 mm
- Oval hoop tube: 29% higher strength than 80×40 at a similar price.
- 100%
- of accessories from our own production: ground anchors, clamps, clips, connectors, film and gutter fastenings.
- ISO
- 9001, 1090 and 3834 — quality management, steel structures and welding.
- 3 years
- warranty on the film.
Accessories from our own production
We make 100% of the accessories in our plant — they fit the structure and we fulfil non-standard orders quickly.
- Y-connectors
- hingeless and hinged clamps
- metal clips
- film fastening systems
- gutter fastening systems
Our multibay tunnels in the field
Single tunnel versus multibay
| Feature | Single tunnels (Solo) | Multibay tunnels (Multibay) |
|---|---|---|
| Structure | free-standing tunnel, each hoop on its own ground anchors | bays joined side by side on shared rows of legs |
| Founding | ground anchors screwed into the soil, steel E370+Z275 | Y-legs screwed into the soil, steel E370+Z275 |
| Hoops | steel S350+Z275, round or gothic arch | steel S350+Z275, round or gothic arch |
| Width | 6–11 m | 6–11 m per bay |
| Gutters and rainwater | no | yes, gutters between the bays |
| Flexibility | easy dismantling and relocation to another field | modular extension with further bays |
| Early crop | warmer inside — better for a very early crop | — |
| Price of structure with film | from 28 zł/m² net | from 23 zł/m² net |
How much does a multibay tunnel cost?
Multibay tunnels: from 23 zł/m² net for the steel structure with film.
The price excludes transport and assembly. Assembly: from 8 zł/m² net. Single tunnels: from 28 zł/m² net.
Price list and what affects the pricefrom 23 zł/m²
net, steel structure with film, excluding transport and installation
From enquiry to a tunnel in the field
Enquiry
You call, write or fill in the configurator: crop, field dimensions, timing.
Site visit
We match the tunnel type, bay width, tube profile and arch shape to the crop and the conditions in the field.
Production
We make the structure and accessories at our own plant in Bralin (Wielkopolska Voivodeship) — c. 10 ha of tunnels per month.
Delivery
We bring the packed parts to the field, and the tubes are bent on site, at the customer's. Transport is quoted separately.
Assembly
We assemble the tunnels as a full service or support your crew with our fitter. Assembly: from 8 zł/m² net.
Frequently asked questions
How much does a multibay tunnel cost?
Multibay tunnels: from 23 zł/m² net. Single tunnels: from 28 zł/m² net. Steel structure with film, excluding transport and installation.
Which hoop tube — 80×40 or 90×50?
80×40 mm is the most often chosen oval tube. 90×50 mm gives 29% higher strength at a very similar price — worth considering where wind and snow loads matter.
What steel are the legs and hoops made from?
We make the legs from E370+Z275 steel — c. 10% stronger than S350+Z275, at the same price. The hoops are from S350+Z275 steel.
Does a multibay tunnel collect rainwater?
Yes. Between the bays there are gutters that carry off rainwater — it can be collected and reused.
How do I reinforce a multibay tunnel against wind and snow?
Lattice cables (3 mm steel cables from Y-leg to hoop) are fitted in multibay tunnels as standard on every hoop — they strengthen the tunnel against wind and partly against snow. As an option we add a Ø35×1.5 mm ridge tube, which stiffens the tunnel from above, and horizontal bracing from Ø40×1.5 mm tube in a T or V variant, which together with the hoop forms a truss and strengthens the tunnel most against snow. The strongest combination is lattice cables and T or V horizontal bracing.
Let's talk about your field
Call or configure a tunnel online — a sales advisor will get back to you with an offer.