The LESA Tapered Dowel System is a plate-dowel load-transfer system designed for concrete construction joints in slabs on ground and pavements.
The system uses a 6 mm tapered sleeve with a 6 mm × 110 mm × 110 mm steel plate dowel. The tapered plate geometry allows the concrete to move horizontally in two directions as it shrinks, while restricting differential vertical movement between adjacent slab panels.
By maintaining vertical alignment across the joint, the LESA Tapered Dowel System provides effective load transfer and helps protect the concrete joint edges from damage under vehicle, forklift and material-handling traffic.
The tapered sleeve is fixed directly to the formwork using the supplied nails. No drilling through the timber formwork is required, making the system quick to set out and install. After the first concrete pour, the formwork is removed and the steel plate dowel is inserted into the cast-in sleeve before the adjoining slab is poured.
The sleeve isolates one side of the plate dowel from the concrete, allowing the joint to open and the adjoining slab panels to move without creating unnecessary restraint.
Plate dowels are available in mild steel or galvanised steel to suit the required project environment. Dowel spacing must be designed for the slab thickness, concrete strength, anticipated joint opening and applied loads.
CANZAC supplies the LESA Tapered Dowel System throughout New Zealand and provides dowel selection, load-transfer calculations and technical support for concrete floor and pavement projects.
SYSTEM COMPONENTS
• 6 mm LESA Tapered Dowel Sleeve
• 6 mm × 110 mm × 110 mm tapered steel plate dowel
• Fixing nails
• Mild-steel or galvanised-steel plate options
DESIGN AND INSTALLATION
Fix the LESA Tapered Dowel Sleeves securely to the formwork at the specified centres before placing the first concrete slab.
After the concrete has hardened, remove the formwork and insert the tapered steel plate dowels fully into the cast-in sleeves before placing the adjoining concrete slab.
Dowel spacing must be selected for the concrete thickness, concrete strength, anticipated joint opening and applied wheel or point loads. Contact CANZAC for project-specific load-transfer calculations and design assistance.
SPECIFICATION TEXT
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SPECIFICATION TEXT:
Product details: LESA Tapered Dowel System comprising 6 mm tapered sleeves and 6 mm × 110 mm × 110 mm steel plate dowels, installed at the specified spacing and in accordance with CANZAC specifications.
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