Quote:
Originally Posted by jhausner
As for cost though, again I don't think the tunnel would be _that_ expensive. Remember, Canada Line cost $2 billion. That's for a fairly long bore tunnel, an equally long cut and cover, elevated track through Richmond, multiple stations, a new bridge, and brand new SkyTrain cars. Not to mention the servicing area in Richmond and a base of operations. For this we're simply talking about a road tunnel.
|
A road tunnel that will need at least 2-3x the bore diameter... The Canada Line tubes are not even wide enough for 1 lane of traffic.
I'll hazard a guess that a TBM at twice the diameter is far more than twice the cost, and digs slower.
I'll also assume that, due to logistics, nobody would ever dig such a tunnel without building in contingency space for an extra future lane... so that's minimum 3+3 configuration. That's a big bore diameter.
Think Cassiar Tunnel, but bored.
I bet the cost is at least 4-5x the cost of Canada Line bored tunnels per km.