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Old Posted Feb 22, 2023, 6:23 AM
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WrightCONCEPT WrightCONCEPT is offline
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Location: Long Beach
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Quote:
Originally Posted by jmecklenborg View Post
I'm unconvinced that the station size, extra entrances, mezzanines, etc. are the real cause of the high costs.

I think these people underestimate the sheer complexity of building new subway lines in a city that already has about twenty of them, plus many other types of tunnels. I suspect that few places remain in Manhattan where a cut-and-cover subway tunnel of any length is a practical alternative to deep bores.
It is a factor in it, but in the case of NYC SAS the most important piece important to tunneling is soil type. The more difficult the soil or harder the granite the more expensive it is to tunnel and mine.
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