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| Re: 2nd Ave Subway Setback (1536840) | |||
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Re: 2nd Ave Subway Setback |
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Posted by Spider-Pig on Wed Jan 29 11:51:00 2020, in response to Re: 2nd Ave Subway Setback, posted by AlM on Wed Jan 29 11:01:54 2020. Assuming cut and cover was actually used instead of mining, a full length mezzanine can't add that much to the cost: Since the entire length of the station has to be excavated, a higher ceiling only decreases the amount of backfill, and probably the weight of the backfill that needs to be supported is even less. Moreover, The stations lack platform columns, It's possible that the ceiling has to be a certain height anyway for structural integrity (IIRC, they're all barrel vaults). If that's the case, a partial mezzanine only means a useless but pretty high ceiling over the rest of the station (like in DC) and the "Stations should all be built like it's still 1904" crowd would complain anyway. |
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