The project The largest rail project in Europe, Crossrail involves the construction of 42km of tunnel and new stations beneath Central London. The challenge As the project involved the construction of twin tunnels, cross passages and a number of new station excavations beneath some of the UK’s highest value and critical real estate, settlement was a big concern. The solution Keller provided a compensation grouting scheme to re-level structures which settled as the tunnelling machines advanced. Having worked on similar tunnelling schemes elsewhere in Europe, Keller company Getec, assisted by monitoring structural movement. A total of 45,000m of Tube á Manchette pipes were installed from numerous shafts beneath around 50,000m 2 of buildings. Where settlement was detected, grout was injected

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