Cavidrain® Liner

Cavidrain® Liner is a combined drainage and waterproofing liner that is welded to form an integral waterproof system. The sheets are easily fixed to the smoothed excavated walls with a sealed fixing detail and the system is finished with shotcrete.

Product Information: Traditional methods of groundwater exclusion are difficult to install with any degree of reliability in modern tunnel constructions. Cavidrain® Liner provides a drainage layer that collects infiltration water from the excavated tunnel face, while also acting as the waterproofing function.

In typical installations, Cavidrain® Liner is fixed to the smoothed, excavated face of the tunnel with rondels and covered with shotcrete. Shotcrete can be sprayed directly to Cavidrain® Liner to create the surface finish, offering 20% less rebound loss than a smooth PVC liner.

Cavidrain® Liner being LLDPE is highly flexible and acts to minimise the build-up of hydrostatic pressure, thus protecting and enhancing the integrity of the tunnel.

Application

• New tunnel construction

• Repair of existing tunnels

• Highway tunnels

• Railway tunnels

• NATM constructed tunnels

• Drill and blast tunnels Metro underground stations

• Cable tunnels

• TBM tunnels