HS2 have revealed the final designs for the North Portal of the Chiltern Tunnel – the last of seven key structures for the high speed rail project’s longest tunnels. Once construction is complete, the seven ‘Key Design Elements’ will be the only parts of the tunnel visible to the local community. Alongside the North Portal, […]
Two enormous 2,000 tonne tunnelling machines digging HS2’s longest tunnels passed the second of five ventilation shafts this week, 4 miles into their 10 mile drive under the Chilterns. The milestone comes a week after the launch of another giant TBM in Ruislip which begin excavating the London tunnels for the high speed rail project […]
HS2 has revealed the designs for the north portal of the Chiltern Tunnel, which has been specially designed to cut noise from trains entering and exiting the project’s longest tunnel at speeds of up to 320km/h. Two perforated concrete hoods will cover the track, extending the 10 mile long tunnel into the open air. These […]
Two enormous Tunnel Boring Machines (TBMs) excavating HS2’s longest tunnels have completed the first stage of their drive – from the Chiltern tunnel’s south portal to the first ventilation shaft at Chalfont St Peter. HS2 this week confirmed that the two enormous 2,000 tonne tunnelling machines digging the high speed rail project’s tunnels under the […]
