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Contractors World  - UK & Ireland
2014 Vol 4 No 1

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Crossrail completes record breaking fortnight of milestones - page 3 of 5
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Sophia under careful control as she drive under London

Sophia under careful control as she drive under London

Ada completes her journey

Ada completes her journey

) Ada breaks through into Stepney Green Cavern

Ada breaks through into Stepney Green Cavern

The ’Ladies’ Performed Well

Andrew Wolstenholme OBE, Crossrail Chief Executive said: “The tunnelling teams deserve tremendous credit for their safe and efficient progress in constructing this major new railway under London.

“The end is now in sight for Crossrail tunnelling with over 70 per cent of the new rail tunnels now constructed. The next major element of the Crossrail programme will now begin with the fit-out of our tunnels and stations.”

The 150 metre long, 1,000 tonne machines create 6.2 m diameter tunnels by installing precast concrete segments in rings to line the tunnel.   They are pushed forward by hydraulic rams and positioned using lasers and Global Positioning Systems.

Ada’s 6.9 kilometre journey has been particularly challenging for engineers, successfully navigating a complex web of Tube lines, building foundation piles and infrastructure up to 30 metres beneath central London. This included passing less than a metre above the operational Northern line at Tottenham Court Road.

More than 72,000 pre-cast concrete segments have been used to line the western tunnels and about two million tonnes of earth has been excavated, destined for a new RSPB nature reserve at Wallasea Island, Essex.

Now that Sophia’s journey has finished, her sister Mary will shortly be launched from the Woolwich box to complete the final section of tunnelling on Crossrail’s southeast section. With the arrival of TBM Jessica at Stepney, an eighth tunnelling machine, Ellie, will commence her journey from Pudding Mill Lane to Stepney later this month.

TBM Jessica will be taken to Limmo Peninsula for reassembly where she will construct the new Crossrail tunnels between Limmo and Victoria Dock Portal.

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