HS2 joint venture contractor Align has advanced site preparations near the M25 for the arrival of the project’s first giant tunnelling machines. The two 2,000t TBMs will be launched early next year to dig the 10-mile-long Chiltern tunnels – the longest bore on the project.
At 136 acres – the size of 80 football pitches – the South Portal Chalfont Lane site will be the biggest construction site playing a key role in phase one.
From here, specialist teams will deliver both the tunnelling and the construction of the adjacent Colne Valley Viaduct.
Work is now also underway to build a concrete precast plant where more than 118,000 tunnel segments will be made. Caunton Engineering are supplying the structural steelwork for this plant.