Municipality of Amsterdam announced plans for 9.5 km line with 7 stations to connect World Trade Centre in the south of the city with Buisklotermeerplen in the north with possible extensions south to Schiphol airport and Hoofdorp and north to Purmerend and Zaanstad. Some 6 km of the initial project will be underground with 4 km in bored tunnels, some beneath buildings with wooden piles. Nov 1998.
Project now divided into 15 contracts and tenders invited for contract 4 which comprises 3.8 km in 5.8 m i.d. bored tunnels to intersect four underground stations at Centuurban, Vijzelgracht, Rokin and Centraal where a connection will be made with the East/West line. Second contract will be for supply of two shields to a design requiring a choice of cutterheads, face stabilisation by slurry, EPB or compressed air, and muck removal by screw or belt conveyor. June 1999.
Invitation to tender for 2 x 3.8 km bored tunnels with 5.8 m internal diameter and supply of two TBMs. August 1999.
Deadline 18th May for new invitation to prequalify for Contract 4.2 for bored tunnels and contracts 5.2, 6.2, and 7.2 for three cut-and-cover stations to be built within diaphragm walls at Rokin, Vijzelgracht and Ceintuurbaan. The twin-tube tunnels are 3.8 km-long x 5.6 m-diameter, requiring two TBMs from list of four prequalified manufacturers. Tender deadline for prequalified contractors will then be 15th October this year with a view to award in Spring, 2001. Tenders should be mailed to the project bureau, PB 95089, 1090 HB Amsterdam, Netherlands. Fuller picture at http://ted.eur-op.eu.int select 45 221 240. May 2000.
Prequalified contractors for $960 million, 3.8 km x 6.5 m-diameter north-south line, contract 4, invited to bid by mid-December are Bouygues/Koop; BTC; Comol; HBN; Saturn; and Tubicon. Award should be mid-2001, with construction starting September, 2001. Preferred suppliers of TBMs are Herrenknecht, IHI, Kawasaki and Mitsubishi. 9.5 km-long project includes 2.5 km at grade plus 3.5 km cut-and-cover and 350 m immersed tube across IJ river. Visit http://ted.eur-op.eu.int November 2000.
Open invitation to tender, deadline 4th October, 2001, for construction of 420 m-long immersed tube, 300 m-long cut and cover, and three stations. Award expected end-2001 for start of work early 2002. Contact North-South Line Project Bureau, fax +31 204 167335. Visit www.nzlijn.amsterdam.nl 32/01.