Tunnelling innovations to drive HS2 beneath the Chilterns

Chiltern tunnel TBM cutter head March 2021

UK: The Align JV of Bouygues Travaux Publics, Sir Robert McAlpine and VolkerFitzpatrick has started to excavate HS2’s 16 km Chiltern tunnel using semi-continuous boring machines, in what it says is a first for a UK tunnelling project. Nick Kingsley reports from the South Portal construction hub to the north …