The Bam Nutall and Taylor Woodrow joint venture has achieved the final tunnelling breakthrough on the Victoria Underground Station upgrade project.
The £700M upgrade involves 300m of new tunnels that will link the new north ticket hall with the existing south ticket hall, which is being doubled in size to ease commuter congestion.
The new tunnels at Victoria Station have been constructed in challenging ground conditions, through fast-moving gravels and sands less than 30cm away from the Victoria line and within 60cm of the District and Circle lines.
Safe tunnelling through the site – which is densely populated and borders two Grade II listed operational theatres – has necessitated 3,000m3 of ground to be excavated by hand in order to stabilise the ground and protect nearby assets.
Bam Nutall senior project manager Craig Prangley said: “[The breakthrough] is the culmination of over five years of hard work and in excess of three million man hours with our tunnelling teams working 24 hours a day to construct the tunnels.”
Mayor of London Boris Johnson added: “This awesome feat of engineering is central to Victoria Station’s remarkable renaissance. Without many of us even noticing, London Underground engineers have completed a mammoth task, uniting 300m of new tunnels right beneath our feet.”