AIR · Air
Large-bore segmented Polyduct — split-cylinder construction for diameters that exceed road-transport limits (Ø2.4 m, Ø2800 mm, 3 m ID), plus modular intake cones and stacked artificial-shaft configurations. Assembled on site, no oversized permits.
At a glance
Why this product
Segmented Polyduct is fabricated as longitudinal HDPE half-shells that bolt together on site. The construction lets us deliver diameters past the road-transport envelope (Ø2.4 m, Ø2800 mm, 3 m ID) without oversized-permit cost or escort. Segments ship flat — efficient transport, fast assembly.
Reference projects: 3 m ID Split Polyduct supply across multiple underground mines; Vasse 5.5 m primary intake cone (15 mm HDPE, modular construction); artificial-shaft Polyduct stack at the Sydney Metro Hunter Street site.
Sizes
| Size | OD | Length | Weight | Notes |
|---|---|---|---|---|
| 3 m ID Split Polyduct | 3000 | — | — | Largest standard split-shell · workshop-fabricated, site-assembled |
| Ø2800 Split Polyduct | 2800 | — | — | Large-bore split — common primary-intake size |
| Ø2.4 m Fabricated Split | 2400 | — | — | Mid-range split-shell · for primary drives over standard road width |
| Primary Intake Cone — 5.5 m | — | — | — | 15 mm HDPE · modular construction · UV-stable · significant savings vs steel (Vasse reference) |
| Artificial-shaft stack | — | — | — | Stackable Polyduct configuration — substitutes for fabricated steel shafts (Sydney Metro Hunter Street reference) |
| Custom diameter | — | — | — | Larger or non-standard diameters fabricated to drawing |
Named variants
Each variant below is a distinct, named configuration we’ve built. Tap the image to view the full gallery.
Polyline's largest standard split-shell duct — fabricated in the workshop as longitudinal HDPE half-shells and bolted together on site. Used on multiple underground primary-intake drives where the working diameter exceeds road-transport width.
↑ Back to list5.5 m primary intake cone fabricated in 15 mm HDPE as a modular bolt-up assembly. UV-stable, corrosion-free and significantly cheaper than the steel-fabricated equivalent it replaced.
↑ Back to listStackable Polyduct configuration that substitutes for a fabricated-steel ventilation shaft. Sections ship flat, are bolted together on site and rise vertically — no hot work, no permits, no escort.
↑ Back to listMid-range split-shell duct — fits primary drives that exceed the standard road-transport envelope but don't need the full 3 m bore. Workshop-fabricated 30 Jul 2020 reference build.
↑ Back to listCommon primary-intake size — large-bore split shell that ships flat and bolts together on site. Pairs with the Vasse-pattern intake cone for full-system supply.
↑ Back to listFreight reference — a 12 m shipping container fully loaded with segmented Polyduct sections. Illustrates how the split construction collapses the transport footprint compared with pre-formed equivalents.
↑ Back to listGallery
Send your site details and requirements — our engineering team will scope and quote.