The construction of five Crossrail grout shafts in Mayfair is complete. The 17 metre deep shafts are located in South Molton Lane, Davies Mews, Haunch of Venison Yard, Dering Yard and Tenterden Street.
Crossrail tunnelling contractor, BAM Ferovial Kier Joint Venture (BFK) are now constructing the grouting tubes (TAMS) that radiate from the base of the shaft to ensure that buildings are protected from any potential ground movement during Crossrail tunnelling. When the grout shaft is in operation, engineers will pump a cement-like substance (grout) deep into the ground.
When tunnelling starts the shafts will become active for certain periods of time. A small worksite will be needed around each shaft until after tunnelling has been completed.
The video below shows a grout shaft being constructed in Dering Yard.