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| Re: Second Ave Alignment Change (638766) | |||
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Re: Second Ave Alignment Change |
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Posted by Sand Box John on Mon Jun 23 23:31:22 2008, in response to Re: Second Ave Alignment Change, posted by trainsarefun on Mon Jun 23 20:24:52 2008. Keep in mind, though, that this is mostly TBM construction. If MTA decides to narrow the tunnel diameter, even if the tunnel is itself left-justified or right justified, with respect to the 2nd Av median, it could still be prohibitively costly to work the unworked side.The only thing that is TBM construction is tunnels that the trains travel through. The contractor will excavate the station train room out after the TBM has passed. This was how ALL of the station in bed rock were done on WMATA where a TBM was employed to dig the train tunnels. As to the issue of 'left-justified, right justified' I wouldn't take those drawings in slides 4, 5 and 6 in Community Board Eight as gospel as to where the station will be located in relationship to the center line of Second Avenue. The station center lines shown on the plans in slides 4 and 5 are not the same as the center lines shown on the section in slide 6. John in the sand box of Maryland's eastern shore. |
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