Deleted
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Post by Deleted on Mar 31, 2013 20:08:15 GMT
These photos show the Plumstead Portal Works in full swing. The treatment plant, where the excavated slurry is processed into a dry powder for transporting away later. The large crane used to move the tunnel segments in the background off the lorry, and down to the TBM's. White Hart Road railway bridge with infilling to stop the road surface being damaged when the tunnelling machines pass underneath it. Another end-on view towards Plumstead Portal, showing the large crane. This is where the future tracks will be. These shots give some insight into some the heavy works that are taking place now. Photos edited by Londonstuff to reduce them to within the 800x500px limit.
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Post by carltona on Apr 7, 2013 7:06:38 GMT
Maybe I'm being a bit dim here but what is the pile of muck under the bridge about? How does that prevent damage to a road surface?
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rincew1nd
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Post by rincew1nd on Apr 7, 2013 8:15:08 GMT
I pondered this with HWMBO (a civil engineer) when I first saw the pictures.
The idea of protecting the road surface is a dud, road surfaces are dead cheap; it has to be something more.
The wing walls appear to have been demolished so it may be to help restrain the embankments. There is the possibility of the ground moving if tunneling is to pass under the area, possibly with the bridge supports moving apart and the span then dropping into the gap; smaller gap, less damage.
My personal thought was that its one way to stop over-height vehicles going that way as a short-cut.
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Post by ianvisits on Apr 12, 2013 13:02:02 GMT
I suspect that is more to do with some security problems that they have been having down there - blocking off the road reduces the exit opportunities.
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