Computerised Caisson Shaft Jacking system Preston UID (2003 – 2005) A computer-controlled jacking system was developed which delivers complete verticality control over the shaft-sinking process. Since pioneering this technique, it has been used to sink more than 100...
MultiMode™ TBM Heathrow Terminal 5 Tunnels (2002 – 2005) To ensure continued operation of the airport and the safety of tunnel construction as little as 4.5m below the operational airfield, the MultiMode™ Tunnel Boring Machine (TBM) was developed in collaboration with...
Grey Rock Tunnel Design Philosophy North Downs Tunnel Channel Tunnel Rail Link (1998 – 2002) The 3.2km North Downs tunnel required construction of the largest cross-section tunnel ever to be built in the UK at 174m2. The ‘Grey Rock’ approach considers the...
Self-Cleansing Tunnel Lining Hastings Bathing Water Tunnels (1997 – 2000) As part of the Hastings Bathing Waters Project designed to reduce the frequency of sewage spills to the sea; a large storage volume needed to be created to store the combined flows until they...
CombiShell™ Heathrow Baggage Tunnels (1994 – 1996) The first combined permanent and secondary sprayed concrete lining. The CombiShell™ tunnelling method was used to form complex underground structures required to accommodate the baggage handling equipment under...
