Preventive waterproofing
In terms of waterproofing design, cut-and-cover tunnels bear many similarities to basement car parks, and the two facility types are subject to roughly the same watertightness requirements.
Particularly relevant for cut-and-cover tunnels are the tunnel profile and associated construction methods.

Each of the following profiles necessitates a different approach to construction:

• Rectangular profiles
• Horseshoe profiles
• Double-horseshoe profile

Typical project features:

• Construction method dictated by tunnel profile
• Long, narrow concrete bays
• Invert area inaccessible after completion

Potential risks:

• Complicated geometry of structural elements
• Concrete quality
• Temperature fluctuations
• Long construction periods
• Drainage in area of ceiling/crown

Rascor provides:

• Integral "White Tank" waterproof concrete basement system
• Joint sealing
• Subdivision of bays using crack-inducing units
• Waterproofing of penetrations
• Reinforcement optimization

Remedial waterproofing
The limited closure periods allowable for cut-and-cover tunnels in service imposes severe constraints on remedial waterproofing works. Particularly with rail tunnels, operations are normally confined to the night-time hours. Due consideration also has to be given to the provision of the necessary back-up infrastructure.
Here, RASCOR provides suitable products and solutions to cater for all waterproofing needs.