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Jubilee Tunnel starts
00:00 26 May 1994
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Tunnelling has begun on the œ1.8 billion Jubilee Line
extension of the London Underground with the construction of the
first trial section under the capital (see pic).
A joint venture of Costain Taylor Woodrow, which is building the œ76 million London Bridge station (Contract 104), has begun the excavation of a 40m long 11.3m dia trial tunnel.
The tunnel was started from the base of a 20m-deep access shaft sunk near the existing London Bridge Station.
It is one of the few to be excavated on the Jubilee Line extension using the New Austrian Tunnelling Method. The technique involves using excavators to dig the tunnel while supporting the roof with shotcrete and roof bolts.
Tunnelling has also begun on contract 102, Balfour Beatty-Amec's œ157 million job at Westminster and Waterloo.
Purpose-made tunnel boring machines are not due on site until later in the summer.
A joint venture of Costain Taylor Woodrow, which is building the œ76 million London Bridge station (Contract 104), has begun the excavation of a 40m long 11.3m dia trial tunnel.
The tunnel was started from the base of a 20m-deep access shaft sunk near the existing London Bridge Station.
It is one of the few to be excavated on the Jubilee Line extension using the New Austrian Tunnelling Method. The technique involves using excavators to dig the tunnel while supporting the roof with shotcrete and roof bolts.
Tunnelling has also begun on contract 102, Balfour Beatty-Amec's œ157 million job at Westminster and Waterloo.
Purpose-made tunnel boring machines are not due on site until later in the summer.
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