Arun Sharma Posted August 23, 2022 Share Posted August 23, 2022 What was interesting about the cross-tunnel film was the unstated amount of destruction of cast concrete rings and the requirement for bespoke replacements. Since the cross-tunnel links two completed running tunnels which are lined with arc slabs as part of their build, any oblique connection has to destroy part of the supporting rings of both tunnels. Since these rings support the tunnels, how do they do that? 1 Link to post Share on other sites More sharing options...
ess1uk Posted August 23, 2022 Share Posted August 23, 2022 57 minutes ago, Arun Sharma said: What was interesting about the cross-tunnel film was the unstated amount of destruction of cast concrete rings and the requirement for bespoke replacements. Since the cross-tunnel links two completed running tunnels which are lined with arc slabs as part of their build, any oblique connection has to destroy part of the supporting rings of both tunnels. Since these rings support the tunnels, how do they do that? I wondered about that. do they put a different ring in every 500 metres? 1 Link to post Share on other sites More sharing options...
Ron Ron Ron Posted August 23, 2022 Share Posted August 23, 2022 51 minutes ago, Arun Sharma said: What was interesting about the cross-tunnel film was the unstated amount of destruction of cast concrete rings and the requirement for bespoke replacements. Since the cross-tunnel links two completed running tunnels which are lined with arc slabs as part of their build, any oblique connection has to destroy part of the supporting rings of both tunnels. Since these rings support the tunnels, how do they do that? From earlier photos, they use a precision drilling rig to cut a hole through the tunnel rings and then constructed a heavy duty, reinforced cross tunnel portal, through which the cross tunnelling could begin. Here are some photos from the press release, that accompanied the YouTube video..... 2 1 3 Link to post Share on other sites More sharing options...
Ron Ron Ron Posted August 23, 2022 Share Posted August 23, 2022 Also in the Chilterns Tunnels.... Today's update. Florence over 6km in with 10km remaining. Cecilia is running about 300 metres behind. The half way point should be reached later this year. ( note: Xmas is only 4 months away) . 3 1 Link to post Share on other sites More sharing options...
KingEdwardII Posted August 23, 2022 Share Posted August 23, 2022 2 minutes ago, Ron Ron Ron said: Xmas is only 4 months away "All I want for Xmas is a new fast train, a new fast train..." 2 2 Link to post Share on other sites More sharing options...
Ron Ron Ron Posted August 23, 2022 Share Posted August 23, 2022 (edited) More HS2 tunnelling..... Reported on the SkyScraper City forum. Both TBM's at the West Ruislip portal are now fully assembled and being prepared to start digging east, towards Greenford. The first is due to be switched on next week (Tues or Weds) and will cut one metre into the concrete wall, as part of the preparatory work, before being launched. . Edited August 23, 2022 by Ron Ron Ron 1 1 2 1 Link to post Share on other sites More sharing options...
RMweb Premium jamie92208 Posted August 24, 2022 RMweb Premium Share Posted August 24, 2022 (edited) 7 hours ago, Ron Ron Ron said: More HS2 tunnelling..... Reported on the SkyScraper City forum. Both TBM's at the West Ruislip portal are now fully assembled and being prepared to start digging east, towards Greenford. The first is due to be switched on next week (Tues or Weds) and will cut one metre into the concrete wall, as part of the preparatory work, before being launched. . I better rerig my spreadsheet once I know the names. Jamie Edited August 24, 2022 by jamie92208 Link to post Share on other sites More sharing options...
Bob83a Posted August 24, 2022 Share Posted August 24, 2022 AIUI the concrete rings for the Ruislip-Greenford tunnels are coming from or via Grain. So there is one train per day on that route each way. Spoil from the tunnelling is initially being stored on site/processed before being removed later by rail. Rings for the Thames Sewer that came via Grain but I believe originated from Lincolnshire, is it the same for these HS2 rings. It is surprising that the Rings are not coming from the plant at the southern portal of the Chiltern Tunnels which is only a few miles away, particularly as the Chiltern Tunnels are almost complete as far as tunnelling is concerned. 2 1 Link to post Share on other sites More sharing options...
RMweb Premium jamie92208 Posted August 24, 2022 RMweb Premium Share Posted August 24, 2022 5 minutes ago, Bob83a said: AIUI the concrete rings for the Ruislip-Greenford tunnels are coming from or via Grain. So there is one train per day on that route each way. Spoil from the tunnelling is initially being stored on site/processed before being removed later by rail. Rings for the Thames Sewer that came via Grain but I believe originated from Lincolnshire, is it the same for these HS2 rings. It is surprising that the Rings are not coming from the plant at the southern portal of the Chiltern Tunnels which is only a few miles away, particularly as the Chiltern Tunnels are almost complete as far as tunnelling is concerned. I don't think there is enough capacity at the Chiltern portal site, they have over a year of tunnelling to go and also the segments for the Colne Valley viaduct. I wonder if the facility at Grain is the same one that did the segments for the Channel Tunnel. Jamie 1 1 Link to post Share on other sites More sharing options...
Fat Controller Posted August 24, 2022 Share Posted August 24, 2022 2 hours ago, jamie92208 said: I don't think there is enough capacity at the Chiltern portal site, they have over a year of tunnelling to go and also the segments for the Colne Valley viaduct. I wonder if the facility at Grain is the same one that did the segments for the Channel Tunnel. Jamie I believe it is. 1 Link to post Share on other sites More sharing options...
RMweb Premium Siberian Snooper Posted August 24, 2022 RMweb Premium Share Posted August 24, 2022 13 hours ago, KingEdwardII said: "All I want for Xmas is a new fast train, a new fast train..." I just hope that the seats are better than those used on the 80* trains. 1 2 Link to post Share on other sites More sharing options...
RMweb Premium Richard E Posted August 24, 2022 RMweb Premium Share Posted August 24, 2022 7 hours ago, Bob83a said: AIUI the concrete rings for the Ruislip-Greenford tunnels are coming from or via Grain. So there is one train per day on that route each way. Spoil from the tunnelling is initially being stored on site/processed before being removed later by rail. Rings for the Thames Sewer that came via Grain but I believe originated from Lincolnshire, is it the same for these HS2 rings. It is surprising that the Rings are not coming from the plant at the southern portal of the Chiltern Tunnels which is only a few miles away, particularly as the Chiltern Tunnels are almost complete as far as tunnelling is concerned. The sewer rings came from Tallington. 1 1 Link to post Share on other sites More sharing options...
lmsforever Posted August 25, 2022 Share Posted August 25, 2022 This morning drove up from Stoke Manderville village towards P Risboro past the part were line crosses road ,I was astounded to see the trackbed going towards Wendover is now ready for the next stage to be started .It now is leveled with shoulders and looks great. 1 3 2 Link to post Share on other sites More sharing options...
Ron Ron Ron Posted August 28, 2022 Share Posted August 28, 2022 . 15 Link to post Share on other sites More sharing options...
Ron Ron Ron Posted August 29, 2022 Share Posted August 29, 2022 The Launching Girder is now starting to span the A312, with night road closures being implemented. . 10 Link to post Share on other sites More sharing options...
Ron Ron Ron Posted August 29, 2022 Share Posted August 29, 2022 Meanwhile, in London. The Victoria Rd site, just to the west of OOC. At this location, a large crossover box is being built on the approach to the OOC station. Alongside this, there's an associated ventilation and access shaft. Here is a view from the bottom of the shaft, showing a linking tunnel to what will be the underground crossover box. . 8 Link to post Share on other sites More sharing options...
Ron Ron Ron Posted September 1, 2022 Share Posted September 1, 2022 Chilterns Tunnels. The first TBM, Florence, has reached the 2nd head shaft at Chalfont St. Giles. Progress 31/08/22 = 6198 metres The other TBM, Cecilia... Progress 31/08/22 = 5880 metres . 3 1 Link to post Share on other sites More sharing options...
Ron Ron Ron Posted September 1, 2022 Share Posted September 1, 2022 . 4 1 Link to post Share on other sites More sharing options...
lmsforever Posted September 1, 2022 Share Posted September 1, 2022 1 hour ago, Ron Ron Ron said: Thanks Ron they really are cracking on with the work the protests seem to have slowed down now and the works are having little effect on our locality. . 2 1 Link to post Share on other sites More sharing options...
Ron Ron Ron Posted September 4, 2022 Share Posted September 4, 2022 (edited) Tunnelling. A bit of light reading, with some nice diagrams and illustrations....... Shallow TBM launch of the Northolt Tunnel West TBMs at West Ruislip . Edited September 4, 2022 by Ron Ron Ron 3 2 Link to post Share on other sites More sharing options...
RMweb Premium jamie92208 Posted September 4, 2022 RMweb Premium Share Posted September 4, 2022 27 minutes ago, Ron Ron Ron said: Tunnelling. A bit of light reading, with some nice diagrams and illustrations....... https://learninglegacy.hs2.org.uk/document/shallow-tbm-launch-of-the-northolt-tunnel-west-tbms-at-west-ruislip-hs2-lot-s2/ . The link only takes you back to the top of this page unfortunately. This might work https://learninglegacy.hs2.org.uk/document/shallow-tbm-launch-of-the-northolt-tunnel-west-tbms-at-west-ruislip-hs2-lot-s2/ Jamie 1 Link to post Share on other sites More sharing options...
Ron Ron Ron Posted September 4, 2022 Share Posted September 4, 2022 2 hours ago, jamie92208 said: The link only takes you back to the top of this page unfortunately. This might work https://learninglegacy.hs2.org.uk/document/shallow-tbm-launch-of-the-northolt-tunnel-west-tbms-at-west-ruislip-hs2-lot-s2/ Jamie Thanks Jamie Now Sorted ! . 1 Link to post Share on other sites More sharing options...
Ron Ron Ron Posted September 4, 2022 Share Posted September 4, 2022 For anyone interested in the grand, station roofs of yesteryear....... Click on this link...... Birmingham Curzon Street Station: A 21st Century Station Roof . 7 1 Link to post Share on other sites More sharing options...
RMweb Premium melmerby Posted September 4, 2022 RMweb Premium Share Posted September 4, 2022 Quote from that article: "Once completed and fully operational, BCS will have seven terminal platforms serving 65,000 passengers per year." Only 65,000?. That sounds extremely low 3 2 Link to post Share on other sites More sharing options...
Grovenor Posted September 4, 2022 Share Posted September 4, 2022 About two trains a week! 6 Link to post Share on other sites More sharing options...
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