"The first part of 'Anne' - including the 9.11m diameter cutterhead - saw the light of day for the first time in 16 months as it was lifted out of a shaft at Green Park Way in Greenford, west London, on Sunday 24th August. Weighing a total of 1,700 tonnes and stretching for around 150m, the huge Tunnel Boring Machine (TBM) must be lifted out of the shaft in sections using a giant gantry crane."
"Launching from West Ruislip and Old Oak Common and meeting in the middle, the four machines excavated more than 4 million tonnes of London Clay and installed almost 100,000 concrete segments to form the tunnel walls. Now that the tunnel excavation is complete, the team will continue to build the flat tunnel invert on the base, creating a flat surface where high-speed tracks will be laid."
"Engineers working on HS2's west London tunnels spent their Bank Holiday lifting the last of four giant tunnelling machines out of the tunnel it had just dug. The Northolt Tunnel runs between West Ruislip at the outer edge of the capital and the new Old Oak Common station in west London, and was dug by four TBMs, with two leaving from either end and heading to the centre, where they were removed from the ground."
Engineers lifted the final of four giant Tunnel Boring Machines (TBMs) from the Northolt Tunnel during a Bank Holiday operation. The Northolt Tunnel runs between West Ruislip and Old Oak Common and consists of deep twin-bore tunnels bored from both ends to the centre. The TBMs excavated more than 4 million tonnes of London Clay and installed almost 100,000 concrete segments to form tunnel linings. The first part of 'Anne', including the 9.11m diameter cutterhead, was removed from a Greenford shaft after 16 months underground. The tunnel reaches 35 metres depth and now receives a flat invert and 34 mined cross passages before track installation.
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