Tunnel Lining Type lll (Norwegian Handbooks) - Mined Tunnel

Norway, the country with the world’s longest road tunnel, has designed its own waterproofing standard, created to fit Norwegian harsh weather conditions.

For tunnels with dripping water conditions, the Norwegian Road Authorities recommend to use a Type lll membrane, a reinforced membrane that will provide strength and stability.

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The system consists of a waterproofing membrane mounted on an anchor grid, spaced with approximately 50cm to the shotcrete covered rock/mountain. On the inside, towards the traffic, the membrane is either covered with concrete elements or with shotcrete.

For shotcrete applications, Protan recommends geotextile (polypropylene fleece) laminated membrane for increased adhesion. This will minimize the shotcrete waste/rebound and reduce costs.

System description:

Anchor grid
Inner shotcrete
Protan InfraPlan P15R/RX
Rock/Shotcrete

Protan recommends to use InfraPlan P15R or P15RX for Tunnel Lining Type lll.

Protan InfraPlan Systems

Umbrella Draining System - Mined Tunnel

For partial waterproofing the most common tunnel application is the Umbrella System/Drainage System. This system is specifically designed for tunnels with dripping water conditions.

Single / Double Barrier System - Mined Tunnel

Single Barrier System is for hydrostatic water pressure conditions including compartments and injection possibilities. Double Barrier System is also designed to withstand hydrostatic water pressure and combines a test and injection system.

Tunnel Lining Type III - Mined Tunnel

For tunnels with dripping water conditions, the Norwegian Road Authorities recommend to use a Type lll membrane, a reinforced membrane that will provide strength and stability.

InfraPlan - Other Systems

In addition to mined tunnels, Protan deliver full waterproofing systems for a wide range of applications for underground structures: Cut and Cover umbrella and barrier systems, cross-passages, portals and culverts.