Moderators: Komachi, David Benton
philipmartin wrote:The Severn Tunnel was a GWR project and Brunel had some influence in it. He himself, when a young man, nearly died constructing the tunnel under the Thames.
https://en.m.wikipedia.org/wiki/Thames_Tunnel
https://en.m.wikipedia.org/wiki/Severn_Tunnel
David Benton wrote:Funny with all the chemical technology today, how hard it is to seal a tunnel or other structure. The difficulty i suspect is that it is already a wet environment, I know in my line of work , we have sealants that we could guarantee will work if the surfaces are dry , but as soon as you introduce a bit of water or oil , it is impossible to seal .
george matthews wrote:This route is being electrified but electrifying this tunnel is a modern problem. I would be interested to know how they are doing that
johnthefireman wrote:george matthews wrote:This route is being electrified but electrifying this tunnel is a modern problem. I would be interested to know how they are doing that
As far as I can recall, at least one of the major tunnels on the route is being electrified with an overhead rail rather than wire for the pantograph to pick up power from. I think that reduces the height, as the rail is solid and doesn't need all the catenary kit which a wire requires.
george matthews wrote:The continual showers of water are a serious risk to the electricity.
johnthefireman wrote:george matthews wrote:The continual showers of water are a serious risk to the electricity.
I don't have information on the exact state of the leakage into the tunnel. Is it actually "showers" coming from the roof, or is it leakage down the side walls or seepage around the bottom? Remember that overhead electrification operates outdoors in very heavy rain storms where the masts, conductors and insulators would all be soaking wet for long periods.
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