Tuesday, January 2, 2018

Geotechnical 101 -- converting a tunnel


This is a great picture, you can click on it for more detail.  The article has two estimates to turn it into a bicycle tunnel:  3 or 30 million pounds.  I would go for the higher, since I think it is almost as much as to get old musky over and dig a new one.

The bricks are weathered and the tunnel leaks.  This is okay for an old steam train, but falling bricks make for a bad day, for cyclists.  This tunnel has to be relined with a waterproof liner, steel mesh and shotcrete.  Then steel linings for the ventilation shafts, fans, pumps etc.  Now that I think of it, even the high estimate is low, since we must have power and wifi.  :)

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