More than 200 road tunnels across Norway are being improved as part of a comprehensive national upgrading programme by the national road’s authority Statens Vegvesen with works to include fire protection, new emergency exits and replacement of signalling and service equipment. For the NOK 250 million upgrade of the Tåsen Tunnel in Oslo, fire protection technology from PassiveTec has been chosen to achieve a required 120 minutes fire protection based on the RWS time/temperature curve.
Project contractor Peab Norway has applied PassiveTec fireboards as wall cladding in the 1,338m meter twin bore road tunnel. The 24mm PassiveTec® Tunnel Liner is the thinnest and lightest RWS-rated board. PassiveTec XT intumescent sealant was used for the expansion/construction joints, together with Fischer FNA II A4 anchors and tunnel coating from Kapyfract AG.
The Tunnel Liner fireboards are made from fibre reinforced magnesium and other refractory products. As well as their fire protection performance, the specialist boards are free from hazardous substances, offer stability and durability under humid, wet or freezing conditions and are easy and quick to assemble. To increase the speed of installation for the Tåsen Tunnel project, made-to-measure panels were cut to size and coated off site.
“When PassiveTec boards were submitted and tested for use in both tunnel bores they were found to match, and in several cases exceed, the specification requirements,” said Atle Killerud, Technical Manager at specialist fire protection contractor Firesafe.
“We are pleased that our Tunnel Liner was selected for this important city-centre infrastructure project,” said Simon MacDonald, Director of PassiveTec. “With its ability to achieve fire and insulation protection in harsh environments, PassiveTec Tunnel Liner sets new standards for fire protection in tunnels.”