Crossrail’s second tunnel boring machine (TBM) broke ground at Royal Oak portal in west London yesterday, according to Crossrail.
The TBM, known as Ada, will now head towards Farringdon where it is due to arrive late next year. The first TBM, Phyllis, began tunnelling in May, and reached the Paddington station box 750m away on 8 August.
“Once Ada has made sufficient progress, Phyllis will move forward through the Paddington station box onwards to Bond Street, Tottenham Court Road and then Farringdon,” said Crossrail area director west Keith Sibley.
The organisation also said it will complete major works to install a conveyor system behind the TBMs once Ada was fully underground. A total of 24km of conveyer belt will be used to remove excavated material from the western tunnels. A concrete segment plant at Old Oak Common has produced over 12,000 segments, with 3,680 already used on the western tunnel.
Site workers have also laid 2km of 900mm narrow gauge tunnel railway from Westbourne Park to enable tunnel locomotives to transport materials and supplies into and out of the tunnel.