This month will see the award of the contract for monitoring on the North/South Metroline in Amsterdam, with base monitoring scheduled to start in January 2000. Also, talks between pre-qualified TBM manufacturers and the client, the Amsterdam Department for Infrastructure, Traffic and Transport (dIVV) will begin.

Pre-qualification for the bored tunnel contractors closed in July 1999 and briefing of the successful candidates will begin in January/February 2000. This will result in the tender period for the bored tunnel starting in March 2000.

The North/South Metroline from Buikslotermeerplein Station to Zuid/WTC (World Trade Centre) Station will feature two 3.8km long bored tubes with a diameter of 6.5m each, starting at Central Station and finishing at Europaplein Station. The remaining tunnel will be constructed using cu+cover methods, with the exception of a 300m immersed tunnel under the River IJ. Contract 4, construction of the bored tunnels includes the supply of the TBMs and will be based on a design+ construct basis. TBM excavation is expected to begin in June 2003.

A bored method has been chosen to minimise the effects of construction. The tunnels have been configured to follow the street patterns, and rigorous base monitoring will prevail.

The complete North/South Metroline is scheduled to open in late 2006.

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Amsterdam Metro