TWO MORE tunnelling contracts have been let on the second section of the Channel Tunnel Rail Link .
Contracts 220 and 240 both involve tunnelling from the ends of the Stratford International station box, which was awarded to Skanska Construction Group in January (see p26 this month).
Contract 220 is worth £145M and runs west from Stratford to the London portal, just north of St Pancras station. It will be built by a joint venture of Skanska and Japanese tunnelling contractor Nishimatsu and is the longest tunnelling contract on CTRL's second section.
Twin 7.15m diameter bored tunnels will be driven 7.5km under north London, at up to 40m depth. Specially designed TBMs that can cope with high groundwater pressures will be used on the job, which starts in July.
Work includes construction of 12 cross tunnels and two deep ventilation shafts and is due for completion in 2005.
Contract 240 runs east from Stratford to Barrington Road.Worth £120M, the contract was won by a joint venture of Skanska, Costain and Bachy Soletanche. It includes 4.7km of 7.15m diameter tunnels, two ventilation shafts, a 4.5m diameter cross tunnel and eight cross passages.The contract is due to finish in summer 2004.