Cavidrain® – Tunnel Invert Drain
Cavidrain® Invert provides a pre-formed tunnel invert drainage layer into which the concrete floor slab can be easily cast. Cavidrain® Invert replaces the crushed stone and pipes traditionally used to collect and transport away infiltration water.
Traditional tunnel invert constructions favour the extensive use of crushed stone together with a longitudinal collection pipe. There is a significant cost in both time and money associated with excavating the trench and crushing and grading the stone before installation. Large quantities of stone are also required to meet drainage requirements.
Cavidrain® Invert provides a pre-formed drainage layer into which the concrete floor slab may be cast and replaces both the invert trench and pipe to collect water from the tunnel invert. Cavidrain® Invert has an in-plane water flow capacity far in excess of crushed stone. Installation is fast and cost effective as excavation and material movement is significantly reduced. The Cavidrain® Invert profile is optimised for maximum bearing area and has been designed to withstand the compressive loads arising from the placement of wet concrete. Once the concrete has cured, the ultimate load capacity of Cavidrain® Invert is that of the concrete infill.
Cavidrain® invert has been used successfully throughout the world in a number of major tunnel projects.
Typical Client Profile
Tunnel Engineers
Tunnel Contractors
Railway Engineers
Consulting Engineers
Utility Service Providers
Waterproofing Contractors
Applications
New tunnel construction
NATM constructed tunnels
Cut & Cover tunnels
Drill and blast tunnels
TBM tunnels
Metro underground stations
Cable tunnels
Highway tunnels
Railway tunnels
