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Crossrail C435: Farringdon Station

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Crossrail is one of Europe's largest transport infrastructure projects. It is due to open in 2018 and will be named the Elizabeth line, after HM the Queen. Crossrail will transform rail transport by increasing central London capacity by 10% and cutting journey times across the City. The programme will support the equivalent of 55,000 full-time jobs and stimulate regeneration and economic growth. When the Elizabeth line opens in 2018 Farringdon station will be one of the busiest in the UK, connecting with Thameslink and the London Underground to provide links with outer London, the home counties, the City, Canary Wharf and three of Londonís five airports.

CLIENT

Crossrail

VALUE

£750m

DATES

2011 - 2015 

CONTRACT TYPE

Build - NEC3 Option C

C435 Farringdon Station works are split across two worksites - the eastern and western ticket halls. The scope includes the station building, East and West Ticket Hall construction, accesses, caverns, cross passages, reception chambers, lifts and escalator barrels using sprayed and in-situ concrete lining. Farringdon and Barbican tube stations, tube and national rail lines, and the listed Moorgate Spur sidings, under Smithfield Market, are on the site boundaries. Within this constrained, urban environment, collaboration between wider contractors and stakeholders was paramount.

Both C300 TBMs passed beneath Lord Hill’s Bridge. The100-year old, steel-arched road bridge supports Royal Oak LU Station and is owned by Network Rail. In collaboration with Crossrail, we installed 1,225 piles beneath the bridge with tracks and platforms running on either side of the central pier, resulting in near zero settlement after the TBM drive.

ADDED VALUE:

  • £17m saved through our Optimised Contractor Involvement (OCI) proposals
  • C300 TBMs crossed with 850mm clearance from the top of the London Underground Northern line platform tunnel, and 520mm below the overlying escalator barrel, with no disruption to LU services
  • We used the TBM-driven tunnel (part of C300) as a pilot tunnel for C410 station tunnels at Bond Street and Tottenham Court Road, achieving a 7 month programme saving
  • Tunnelling teams worked an eight-hour shift, the result of our research into the benefits of shortening the traditional twelve-hour shift to prevent fatigue
  • "This was a fantastic achievement that clearly demonstrates what can be achieved with a well specified TBM and close control. There was excellent collaboration between London
  • Underground, Crossrail and the tunnelling contractor […] during the planning and implementation of this interface, which has contributed greatly to this success." Tim Morrison, LU Principal Civil Engineer

AT A GLANCE

  • 6.4km twin-bore running tunnels under major assets
  • 30+ sites running concurrently at peak (multiple Crossrail contracts)
  • Up to 3,500 instrumentation and monitoring points
  • 1M+m3tonnes of spoil removed and redirected to create Wallasea Island bird sanctuary
  • 1st in the UK onboard TBM refuge chamber

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