PVC formwork tubes are simple but essential accessories in concrete formwork construction. They serve as sleeves for tie rods (anchor bolts) that hold formwork panels together during concrete pouring. By preventing direct contact between the tie rod and wet concrete, PVC tubes enable easy stripping and — critically — allow the expensive tie rods to be reused many times over.
Available Diameters
| Inner Diameter | Outer Diameter | Tie Rod Size | Typical Use |
|---|---|---|---|
| Ø 22 mm | 26 mm | M16–M18 | Residential construction, light formwork |
| Ø 26 mm | 30 mm | M20–M22 | Standard commercial construction |
| Ø 30 mm | 34 mm | M24–M27 | Heavy commercial and industrial |
| Ø 34 mm | 38 mm | M30 | Industrial and infrastructure |
Step-by-Step Installation
Drill formwork panels
Drill holes in the formwork panels matching the outer diameter of the PVC tube. Ensure holes are aligned on both panels.
Insert tubes
Push the PVC formwork tube through both formwork panels. The tube should extend 5–10 mm beyond each panel surface.
Thread the anchor bolt
Pass the tie rod (anchor bolt) through the PVC tube. The tube protects the bolt from concrete contact.
Tighten and pour
Tighten the formwork assembly and pour concrete. The PVC tube prevents concrete from bonding to the tie rod.
Strip and recover
After concrete curing, strip the formwork. The PVC tube remains in the concrete. Pull out the tie rod — it slides out easily because the PVC prevented bonding.
Reuse the bolt
The tie rod is clean and undamaged, ready for reuse on the next pour. This is the key cost saving.
Advantages Over Metal Alternatives
Tie rod reuse
PVC tubes prevent concrete bonding to tie rods, allowing 10–20+ reuses per rod. Metal tubes corrode and bond to concrete.
Easy stripping
Formwork strips cleanly with no concrete stuck to tie rods. Saves 30–60 minutes per panel compared to metal tubes.
Clean concrete surface
The remaining PVC tube in concrete is sealed with a plastic cap and mortar, leaving a clean, professional finish.
Lightweight
PVC tubes weigh 70–80% less than metal alternatives, reducing transport costs and making handling easier on site.
Cost effective
Although PVC tubes are single-use (they stay in the concrete), the savings from tie rod reuse and faster stripping far outweigh the tube cost.
Corrosion-free
PVC does not corrode, so the concrete around the tube hole remains undamaged. Metal tubes can create rust stains and spalling.