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Chiltern Lines - TESCO Project Tunnel Collapses
Mizter T wrote:
Colin wrote: Just reported on the news channels. 20m of the tunnel being built above the line at Gerrards Cross has collapsed moments after two trains passed each other within the tunnel. Pictures show the collapse is huge. The line will undoubtedly be blocked for over a week at least. Looks like it was extremely lucky that no-one was killed. This website, by a uk.railway contributor, has some great photos of the tunnel collapse: http://freespace.virgin.net/guy.gorton/collapse.html Also see this thread: http://groups.google.co.uk/group/uk....4262cfd057e042 Looking at those pictures, the top of the tunnel seems to be very flat, even on the 'before' pictures. I thought a tunnel/bridge needed to be arch shaped to support load above - those seem to be two right angle bends with a flat section across the top - surely obviuosly not right. Perhaps the sides were two wide apart, leaving and unnaturaly flat meeting point? |
Chiltern Lines - TESCO Project Tunnel Collapses
sharky wrote:
Mizter T wrote: Colin wrote: Just reported on the news channels. 20m of the tunnel being built above the line at Gerrards Cross has collapsed moments after two trains passed each other within the tunnel. Pictures show the collapse is huge. The line will undoubtedly be blocked for over a week at least. Looks like it was extremely lucky that no-one was killed. This website, by a uk.railway contributor, has some great photos of the tunnel collapse: http://freespace.virgin.net/guy.gorton/collapse.html Also see this thread: http://groups.google.co.uk/group/uk....3fe6b98dac72c7 14/a64262cfd057e042#a64262cfd057e042 Looking at those pictures, the top of the tunnel seems to be very flat, even on the 'before' pictures. I thought a tunnel/bridge needed to be arch shaped to support load above - those seem to be two right angle bends with a flat section across the top - surely obviuosly not right. Perhaps the sides were two wide apart, leaving and unnaturaly flat meeting point? Take a look at the Maidenhead bridge arches. |
Chiltern Lines - TESCO Project Tunnel Collapses
Brimstone wrote:
sharky wrote: Looking at those pictures, the top of the tunnel seems to be very flat, even on the 'before' pictures. I thought a tunnel/bridge needed to be arch shaped to support load above - those seem to be two right angle bends with a flat section across the top - surely obviuosly not right. Perhaps the sides were two wide apart, leaving and unnaturaly flat meeting point? Take a look at the Maidenhead bridge arches. Yes. Arches can be quite flat, as long as there is emough support either side to stop them spreading. Hence flying buttresses. Colin McKenzie |
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