Thread: EU lending for Crossrail
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Old September 9th 09, 01:41 PM posted to uk.railway,uk.transport.london,misc.transport.urban-transit
Bruce[_2_] Bruce[_2_] is offline
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Default EU lending for Crossrail
On Wed, 9 Sep 2009 12:38:35 +0000 (UTC), wrote:

Really, whys that then? Would the actual boring part of the TBM cost
substantially more if its diameter was increased by a metre? Would the extra
concrete cost raise the project costs much higher? Or are you just BSing
because you always want to appear to know best?


This is an area where I have specialist knowledge, both as someone who
has worked on several tunnelling projects and someone who has been
responsible for tendering for tunnelling projects.

The cost of the tunnelling machine increases quite dramatically with
tunnel diameter; the cost of the excavation and of the tunnel lining
increases approximately with the square of the excavated diameter.
With the Landfill Tax, the disposal of the excavated material also
becomes a far greater problem as diameter increases.

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