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Heathrow Piccadilly Line Closure
David Splett wrote:
"Mait001" wrote in message ... It's not the enforced closure of the line (although I fail to see how installing a set of points and associated tunnel branching can take all of 18 months) I wondered this too, given that similar jobs for the Victoria and Jubilee lines were done with closures lasting no more than a few hours. However, I understand that there are major problems with water at the site of the T5 junction, and for this reason a quite complex engineering solution is required. There are some details in this month's Modern Railways (page 52). The ground at the junction site consists of water-bearing gravel, and conventional techniques to build a step-plate junction would risk a collapse of the existing tunnel. "At the site of the existing junction, the ground is being opened up for the construction of a big coffer dam extending 25 metres down. ... Once complete,this box will then hold the junction." TBMs will drill towards the site from the T5 end, but the final breakthrough will be done outwards from the box. Then they have the task of restoring the concrete aircraft taxiway over the box. In the circumstances, 20 months seems reasonable. Did I fall asleep at LURS in November, or was this important information omitted from the talk on the T5 extension? Install lifts or escalators at Hatton Cross for a start! It would actually be pretty cheap and easy to install lifts at HC. Perhaps this is a missed opportunity. Based on the Earl's Court experience, I'm not sure about the cheap and easy bit. Anyway, a couple of small lifts wouldn't be very efficient at dealing with lots of people with heavy baggage all arriving together. The missed opportunity, in my view, is the failure to provide adequate publicity of the step-free route via T123 and HEx. It is not mentioned at all on the poster* (customers are advised to phone for advice on step-free routes), though it is eventualy mentioned on the new "Heathrow by Tube" leaflet** if you read far enough. * http://tube.tfl.gov.uk/pdf/Heathow-closure-poster.pdf ** http://tube.tfl.gov.uk/pdf/Heathrow-T4-%20leaflet.pdf -- Richard J. (to e-mail me, swap uk and yon in address) |
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