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BluSeal Tunnel Liner

EASTLINK TUNNELS, MELBOURNE

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1.6km Twin Tunnels under the environmentally sensitive community parkland area of Mullum Mullum Creek Reserve as part of the Eastlink Motorway Extension from the outskirts of the Melbourne CBD to Frankston.

PROJECT COMPLETION: NOVEMBER 2007

CLIENT/END USER: THIESS JOHN HOLLAND

JOINT VENTURE

APPLICATION

WHERE WE USED BLUSEAL LINER

External waterproof membrane system installed to the entire extrados of the tunnel concrete structural lining. The tunnel structure also included cross passages every 120 metres (fourteen in total) and one low point drainage sump pit

 

WHY WE USED BLUSEAL LINER

The tunnels were designed to be fully ‘tanked’ with very strict water ingress limitations specified, being one litre per second for the combined groundwater inflow to both the internal and external drainage systems of the tunnels. The general objective was to have nil environmental impact on the parkland reserve above the tunnels.

 

FEATURES

150,000 square metres of 2mm LLDPE sheet membrane to

both the invert and obvert (arch) of the tunnels

Waterstop joint protection and lining compartmentalisation

External lining z-profile compartments

Post completion injection systems

 

BENEFITS

Minimal long term environmental impact on the surrounding

water tables with nil effects on the Mullum Mullum creek

water levels above

Negligible water inflows that needed to be handled by operational drainage pumping systems for the life of the tunnels

 

SUMMARY

All project specified water ingress limitations were achieved

with the tunnel structural lining works completed on time and within budget, with minimal impact from the waterproofing installation activities.

 

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