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Post by dave1 on Jan 28, 2017 7:40:47 GMT
Just watched a documentary "Strip the city" this was about New York. Following hurricane "Sandy" the subway system was hit bad. They have designed an inflatable plug which will be installed at strategic locations and once the trains have stopped running can the be inflated to seal the tunnel, no need for floodgates like here in London.
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Post by Nortube on Jan 30, 2017 20:56:55 GMT
So, basically, just a big balloon  I suppose with the modern materials available today, these sort of things can be made quite tough. I suppose it's a bit like when they use a similar thing to block a sewer off when they are doing a repair. I assume that where these plugs are placed, the tunnel will have to be profiled in order to give a smooth, tight fitting. Whilst they may be a quick fix, I think that I'd prefer something a bit more permanent and solid like a floodgate. |
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Post by dave1 on Jan 31, 2017 9:31:12 GMT
So, basically, just a big balloon I suppose with the modern materials available today, these sort of things can be made quite tough. I suppose it's a bit like when they use a similar thing to block a sewer off when they are doing a repair. I assume that where these plugs are placed, the tunnel will have to be profiled in order to give a smooth, tight fitting. Whilst they may be a quick fix, I think that I'd prefer something a bit more permanent and solid like a floodgate. The documentary showed a box like shape at the side of the tunnel which after trains had stopped running would be activated, I don't know if it would be interlinked to the signalling system. Did a search and found This. There is a number of other things online as well. |
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