Cavidrain Protector

Cavidrain Protector is a tunnel drainage geocomposite from ABG Geosynthetics

Cavidrain® Protector provides significantly more drainage capacity than traditional geotextile fleece solutions and can often be used to replace the fleece itself.

Cavidrain Protector

Cavidrain® Protector provides a free draining layer to collect infiltration water from behind tunnel linings as well as providing protection from physical damage. 

Applications

  • New tunnel construction
  • Repair of existing tunnels
  • NATM constructed tunnels
  • Cut & Cover tunnels
  • Drill and blast tunnels
  • TBM tunnels
  • Metro underground stations
  • Cable tunnels
  • Highway tunnels
  • Railway tunnels

Benefits

  • Enhanced integrity of the tunnel lining system.
  • Improved drainage capacity.
  • Minimised damage caused by mineral calcification.

Tunnel construction using ABG Cavidrain® drainage geocomposite
Load capacity of Cavidrain is equivalent to the strength of the concrete used

The load capacity of Cavidrain Protector is equivalent to the strength of the concrete used. The cuspates leave a void for water flow.

Good tunnel design anticipates drainage needs by managing the build up of hydrostatic pressure on the waterproofing liners and by transporting water away in the tunnel invert.  Tunnel wall drainage is conventionally provided by a layer of geotextile held in place by nails. Geotextiles offer little or no in-plane water flow making them ineffective as a drainage layer. This limited drainage capacity is further impeded by the compressive forces at this location and the choking of the geotextile due to calcification.

Cavidrain® Protector is a pre-formed cavity drainage system. It is a highly flexible void forming sheet material developed to facilitate the relief of water pressure behind tunnel linings, thus giving hydrostatic protection to the membrane liner. It comprises a flexible thermoformed HDPE (high density polyethylene) sheet in the form of a dimpled profile.

Cavidrain® Protector provides significantly more drainage capacity and can be used to replace the geotextile, creating a free draining void to collect infiltration water from behind the tunnel waterproofing. This minimises the build up of hydrostatic pressure, protecting and enhancing the effectiveness of the waterproofing.

Cavidrain® Protector wall drainage is easily fixed to tunnel walls with sealed drill and fix or shot-fired pins. Shotcrete can be sprayed directly to Cavidrain to create the surface finish and offers 20% less rebound loss than a smooth PVC liner.

Cavidrain® Protector has been used successfully throughout the world in a number of major tunnel projects.

Typical Client Profile:

  • Medium to Large Contractors
  • Tunnel Contractors
  • Consulting Engineers
  • Tunnel Engineers
  • Waterproofing Contractors
  • Utility Service Providers
  • Railway Engineers

Case Studies / Recent Projects:

Cavidrain® Protector has been used in the following tunnel drainage projects:

Related Products

The following similar products provide solutions for drainage and may be relevant:


ABG Cavidrain Protector - a drainage geocomposite used in a tunnel construction
Tunnel construction using ABG Cavidrain® drainage geocomposite
Tunnel construction using ABG Cavidrain® drainage geocomposite

Associated System Products

Within a tunnel construction, our technical team are at hand to discuss you unique requirements. The following product solutions might be a viable alternative:  

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