Tunnel structures are an essential part of our infrastructure for communication, utilities and transport access throughout the UK. Many suffer from a combination of durability and structural issues due to water leakage, new loading requirements and chloride-induced corrosion.

With 50 years experience, Concrete Repairs Limited (CRL) is able to provide a combination of repair techniques, which are specifically designed to deal with these problems. CRL is able to provide a range of leak sealing techniques utilising waterproof linings, injection resins, hypalon banding, or electro-osmosis to stop water penetration through cracks and joints.

To increase the structural load capacity, CRL is able to design and install composite strengthening systems, using carbon or aramid fibre reinforced plates, suitable for concrete, steel and cast iron structures. The company is the leading UK contractor for this type of work and is able to provide a range of strengthening options using composite materials. Chloride induced reinforcement corrosion, due to de-icing salts or a saline environment, can be controlled using a CRL designed and installed cathodic protection system. This is a very cost-effective method for controlling corrosion in tunnels where access can prove difficult and corrosion rates are high. For brick tunnels, CRL is able to install reinforced sprayed concrete linings and stainless steel resin anchors to reinstate the structural integrity of the tunnel.

Many tunnels across the UK have been repaired by CRL for clients such as London Underground, Network Rail, Highways Agency, utility companies and local authorities.