HS2 HIGH SPEED RAIL LINE. LONDON - BIRMINGHAM
22.2 km of tunnel including:
– 20.8 km of twin-tube TBM tunnel (7.2 km with an inner diameter of 7.55 m; 5.5 km with an inner diameter of 8.10 m; and 8.1 km with an inner diameter of 8.80 m).
– 0.8 km SCL (Sprayed Concrete Lining) tunnel with internal diameters ranging up to 15.2 m.
– 0.6 km in cut and cover tunnel with spans up to 30 m.
2.2 km above ground with 2 under bridges and 3 over bridges, two over the Euston station approaches, 120 m long.
6 ventilation and intervention shafts and 1 evacuation shaft up to 45 metres deep.