Facts and figures – The Chiltern tunnel TBMs:
- The tunnels will go as deep as 80m below the ground – ensuring communities and countryside above are not impacted by the railway
- The size of the TBM cutterhead which will bore the tunnels is just over 10m
- Taking into account the thickness of the tunnel walls, the internal diameter of the tunnels in which the trains will pass through will be 9.1m.
- The tunnels will be lined with 2m X 4m concrete segments weighing on average 8.5 tonnes each
- The cutter head will rotate at a speed of up to 3.2rpm with the machine expected to cover 15.6metres per day.
- The total volume excavated by both TBM is 2.7million cubic metres
- The TBMs are steered by tiny adjustments to the hydraulic rams that grip the tunnel wall to move forward.
Our Align JV site at Chiltern Tunnel
Aerial over our Align JV site at Chiltern Tunnel
Watch the video on Twitter via @HS2Ltd
HS2’s first tunnelling machines – Florence and Cecilia - have arrived in the UK ahead of their launch early next year. Watch and follow their journey from factory to the south portal of the Chilterns tunnel, where contractor ALIGN is creating 1,200 jobs. https://t.co/6jllxfBjrO pic.twitter.com/wgqwl95Vdy— HS2 Ltd (@HS2ltd) December 8, 2020
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