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Contractors World  - UK & Ireland
2013 Vol 3 No 4
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Branching off from the ends of the cross passages, the two 250 m long Platform Tunnels will then be built – work has now started on the first platform tunnel which will become the eastbound platform tunnel for the new Crossrail services

The platform tunnels are initially formed as 6 metre pilot tunnels which are then enlarged to the final diameter of 9.5 metres

More than 600 metres of temporary and full size tunnels have been built so far – the station tunnels will be completed in 2015. The tunnel boring machines creating the central tunnelled section of the Crossrail route will come through Liverpool Street site and are scheduled to arrive in late 2014. Once work is completed the Finsbury Circus park area will be restored.

  • Blomfield Street shaft – foundations completed on box structures

Vinci Construction UK Limited is creating a 40 m-deep box structure on Blomfield Street to accommodate ventilation, electrical, mechanical and systems equipment for the new station.

Groundforce MP80 mechanical struts on hire to McNicholas Construction provide temporary propping at Liverpool Street to dimensions of 36 m long x 2.5 m wide x 7.2 m deep

So far over 250 piles have been completed, including all high-level foundation works and two thirds of the main shaft piles installed up to 50 metres deep, making the box Crossrail’s deepest piled shaft.

Adjacent to the box, a new Communications Equipment Room (CER), power substation and switch rooms for the Liverpool Street London Underground station are being constructed. This will allow the demolition of the existing substation to create space for the Broadgate ticket hall on Liverpool Street.

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