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| Re: Metro Station at Dulles Airport to be Built Underground (1053140) | |||
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Re: Metro Station at Dulles Airport to be Built Underground |
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Posted by Sand Box John on Thu Apr 7 08:07:18 2011, in response to Re: Metro Station at Dulles Airport to be Built Underground, posted by Olog-hai on Wed Apr 6 23:50:03 2011. More like unique. The high ceilings are overdoing things.So is Annacostia, but it was built that way for a reason and it still retains the open unobstructed design. All that concrete steel use in those columns down the center line of the platform could have been used to built a unobstructed arched vault. Contrary to popular belief an arched vault of the same width and volume of a box vault uses less concrete and steel to build. Fort Totton lower level was an either of engineering problem, mine out more soil to create unobstructed arched vault or mine out less soil and put columns down the center line of the platform. The mine out less soil solution was chosen. John in the sand box of Maryland's eastern shore. |
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