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[quote user="RME"]Heck, if it's that important, why not do an emergency excavation, put in a temporary bridge, and handle the new-line construction as if in a cut with uncertain subgrade when the time comes for the trackwork? We've seen how quickly bridges can be replaced or erected when need be...[/quote] First some information about the TBM: It is about 310' long and weighs about 2,000 tons. The assembly on site took about 12,000 hours. Here is an interesting video though it is in German: <a href="https://www.youtube.com/watch?v=TqSiOG7LHXA">https://www.youtube.com/watch?v=TqSiOG7LHXA</a> Your guess is as good as mine how long it would take to disassamble the TBM. The bridge you mention needs a span of about 400 ft and don't forget the needed heavy foundations. See aerial view: <a href="https://abload.de/img/zwischenablage03eksn3.jpg">https://abload.de/img/zwischenablage03eksn3.jpg</a> The freezing alone would take approximately six (6) week not taking into account the time for installation. I don#t think all this would be faster than what is planned now: A concrete slab 400' long, 50 ft wide and 3'-4'' thick. Both contractors, Zueblin and HOCHTIEF, are very experienced. Here is a link to a description of HOCHTIEF: <a href="https://en.wikipedia.org/wiki/Hochtief">https://en.wikipedia.org/wiki/Hochtief</a> The Wiki-article is a bit old but still a quite good overview. I've worked for HOCHTIEF in structural engineering for more than 30 years. I'm sure they know why they go for this solution and without knowing all boundary conditions and requirements I'm not in a position to judge that decision. Regards, Volker P.S.: Is there a way to link single post in this thread? <a>http://cs.trains.com/trn/f/111/p/264617/2989834.aspx#2989834</a>"Rail Traffic Chaos in Southern Germany" Otherwise it would be nice if the moderaters would merge the threads.
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