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  1. I imagine there are plenty of vibrations in km tall drilling platforms.

  2. But the Marmaray is meant to sink!  As I suggested to JakeS, his (indirect) suggestion of ferrocement is very appealing, given its lightweight, toughness, and proven record with maritime applications.  There are 100 year old boats still floating in the sea.  AAC (aerated concrete) with a ferrocement outer would be even better, given its positive natural buoyancy.  We know that positive buoyancy is possible, given that there are ships that carry trains.  It's then just a question of diameter and materials choice.
by njh on Tue Dec 22nd, 2009 at 06:34:08 PM EST
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But the Marmaray is meant to sink!

Actually, it is meant to float: before the interior is completed, just at the limit of buoyancy so that it can be towed into the right position before it is sunk to its place. Buoyancy doesn't matter once it is at the bottom and covered over.

*Lunatic*, n.
One whose delusions are out of fashion.

by DoDo on Tue Dec 22nd, 2009 at 06:49:56 PM EST
[ Parent ]
1) And in skycarpers and radio towers and suspension bridges and cable-stayed bridges too. But the typical vibrations and the critical components in all of these are different and need to be tested.

Ferrocement, and/or larger tube diameter for buoyancy, now that I don't see why it can't work. You should patent it :-)

*Lunatic*, n.
One whose delusions are out of fashion.

by DoDo on Tue Dec 22nd, 2009 at 06:57:31 PM EST
[ Parent ]

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