Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Jul 16, 2014 2:53:21 GMT
The BBC have a new series of three 1-hour long documentaries about Crossrail starting this evening. The trailer for the first programme looked rather good and I thought it may be of interest to others on this forum. It's called 'The Fifteen Billion Pound Railway' and is on BBC2 at 9pm.
|
|
|
|
Post by murph9000 on Jul 16, 2014 19:40:45 GMT
Here's a direct link to the programme's web pages, which gives some more info and should have iPlayer links available after broadcast. www.bbc.co.uk/programmes/b04b7h1w |
|
|
|
Post by domh245 on Jul 16, 2014 21:03:50 GMT
Well I thought that the first episode was pretty interesting. Very impressive that they managed to pass through the eye of the needle without any calamity. Out of interest, what were the tolerances like when they were building the original tubes? With crossrail it was to within a couple of centimetres of the intended route I doubt that the old tube diggers could have been that accurate!
|
|
|
|
Post by phillw48 on Jul 16, 2014 21:31:31 GMT
Here's a direct link to the programme's web pages, which gives some more info and should have iPlayer links available after broadcast. www.bbc.co.uk/programmes/b04b7h1wThe bit about the Victoria Line was also interesting, was it really 50 years ago? |
|
|
|
Post by rapidtransitman on Jul 16, 2014 21:42:00 GMT
Well I thought that the first episode was pretty interesting. Very impressive that they managed to pass through the eye of the needle without any calamity. Out of interest, what were the tolerances like when they were building the original tubes? With crossrail it was to within a couple of centimetres of the intended route I doubt that the old tube diggers could have been that accurate! domh245 - I recently watched the Tunnel Vision clip on www.forgottenrelics.co.uk/tunnelvision/index.html, which very interestingly detailed the method by which the alignment and progress of one Victorian tunnel was done - it claims 3" accuracy over a kilometre or so IIRC, using just line of sight towers above ventilation shafts. Pretty darn impressive I'd say. Obviously Tube tunnels deal with a much different above ground geography and underground geology, but the shorter distances between stations may have made the tunneling a bit more accurate. |
|
|
|
Post by railtechnician on Jul 17, 2014 0:41:13 GMT
Well I thought that the first episode was pretty interesting. Very impressive that they managed to pass through the eye of the needle without any calamity. Out of interest, what were the tolerances like when they were building the original tubes? With crossrail it was to within a couple of centimetres of the intended route I doubt that the old tube diggers could have been that accurate! domh245 - I recently watched the Tunnel Vision clip on www.forgottenrelics.co.uk/tunnelvision/index.html, which very interestingly detailed the method by which the alignment and progress of one Victorian tunnel was done - it claims 3" accuracy over a kilometre or so IIRC, using just line of sight towers above ventilation shafts. Pretty darn impressive I'd say. Obviously Tube tunnels deal with a much different above ground geography and underground geology, but the shorter distances between stations may have made the tunneling a bit more accurate. If you want to know exactly how the Victorians built the tube tunnels look no further than 'The Engineer' magazines of the period which explain in detail the methods used to drive the tunnels on an accurate alignment. |
|
|
|
Post by melikepie on Jul 17, 2014 8:06:49 GMT
Its a shame they didn't include more technical stuff
|
|
class411
Operations: Normal
Posts: 2,724 
|
Post by class411 on Jul 17, 2014 8:50:36 GMT
Here's a direct link to the programme's web pages, which gives some more info and should have iPlayer links available after broadcast. www.bbc.co.uk/programmes/b04b7h1wThe bit about the Victoria Line was also interesting, was it really 50 years ago? It was indeed. And it's now well over seventy years since Sgt. Pepper taught the band to play. |
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Jul 17, 2014 9:53:51 GMT
Sounds like a very interesting series tow atch when I get a chance to at some point this week.
|
|
|
|
Post by melikepie on Jul 17, 2014 9:59:45 GMT
How is it that almost paper thin walls at Tottenham Court Road did not collapse at those points under the weight of the new tunnel?
|
|
|
|
Post by trt on Jul 17, 2014 10:30:56 GMT
How is it that almost paper thin walls at Tottenham Court Road did not collapse at those points under the weight of the new tunnel? It had to withstand the weight of the clay that they removed and replaced with concrete, air and TBM. |
|
|
|
Post by melikepie on Jul 17, 2014 19:56:38 GMT
Sorry, I was meaning, when the tunnel passed within 35cm of the escalator supports and 85cm of the Northern Line, how did they not collapse? They seemed to be stressing how thin it was here
|
|
|
|
Post by domh245 on Jul 17, 2014 20:07:14 GMT
From the diagrams they gave - it was 35 cm beneath the foundations for the escalators, so that would have been sufficient clearance. Likewise 85cm above the tunnels would be sufficient clearance, as the weight of the TBM will have be spread out over a fair area, don't forget that as soon as the tunneling head has gone, the walls are sprayed with concrete to harden the mud around it, before the concrete linings are put in place.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Jul 18, 2014 1:09:03 GMT
|
|
|
|
Post by jswallow on Jul 18, 2014 5:04:28 GMT
Thanks for the Victoria line film, that's really interesting, sadly, more watchable than the new documentary shown on Wednesday for me.
It was one of those "put a camera in front of someone and they turn into an idiot" sort of programme ... the people with "Where's Willy?" (the hours must fly by for them), the berk supervising the crane removal, all the usual reality show types were there.
There were a couple of interesting things in it, the damage being caused to the building in Soho Square was a high point, but all the drama about threading the needle just led to a "well that worked" result. Which of course should have been the outcome but doesn't make for interesting telly. I'm hoping the next episode is better.
|
|
roythebus
Pleased to say the restoration of BEA coach MLL738 is as complete as it can be, now restoring MLL721
Posts: 1,256
|
Post by roythebus on Jul 18, 2014 7:22:13 GMT
Mentioning building the Victoria Line reminds me of the joke of the time about the Italian "professional lady" who was quite excited about Victoria Tubeline being laid by 2000 men in 3 years...
The clips on the Oxford Circus Umbrella (was it really 50 years ago...) showed loads of RTs, RTLs and RTWs around with the minority of buses being new Routemasters, and the lorry with the 35 ton girder perched on top of a couple of bits of scaffold!
|
|
|
|
Post by melikepie on Aug 7, 2014 10:32:00 GMT
Just some comments on the second and third episode.
I found it really interesting how close the Connaught Tunnel was to the bottom of Royal Albert and Victoria docks and how they had to block it off and rebuild the tunnel in such a short time span.
For the final episode, I am disappointed that whilst it was a treat seeing the TBM break through at Whitechapel, they did not show anything else at that station. The archaeology throughout was good however..
Hmmm, interesting they never mentioned the construction of Woolwich which if I'm correct will be the only completely brand new station with no interchange. I know Canary Wharf is the other one but it does have surface level interchange.
|
|
|
|
Post by norbitonflyer on Aug 7, 2014 11:04:38 GMT
Woolwich which if I'm correct will be the only completely brand new station with no interchange. I know Canary Wharf is the other one but it does have surface level interchange. The distance between Canary Wharf (Jubilee) and canary Wharf (Crossrail) is very similar to that between Woolwich XR and Woolwich Arsenal, although interchange with SER will be easier at Abbey Wood (interchange with the DLR is less of an issue as it goes in the same direction as Crossrail). |
|
