About 2:18 "If needed, down the road, 10 or 20 years, if the bridge starts to sag a little bit, we can pull on them and stress them again". What, AFTER 2:49 "the strands will be cut", for capping off, you still have enough length of protruding strand to get a grip on with tools to restress it? What, with the same tools? Or is a different procedure required to restress a strand that has been cut for capping off? Is there is a danger when restressing a cut-off strand that if you lose your grip on it with tools, the strand will contract back inside the cable and you can't get a hold of it again? How many people actually have experience of restressing cut-off strands? More or fewer than have walked on the moon? Is there a video of someone restressing cut-off strands because I would very much like to watch that video?
When strands already cut, there is still enough length to do re-stressing with the same equipment. There is also another procedure of re-stressing, when you pull not the strands one by one, but the whole bundle of strands. If for some reason you lost one strand (slippage or break), there is also procedure of replacement.
@@anatolybabadzhanov6866 Thanks. What I'd really like to know how to do is how to do this on a bridge built some years ago - release a strand from the anchor block so that work can be done to electrically insulate the released strand from the anchor block - and then get the strand back through the anchor block when it is now TOO SHORT to simply manually thread it through. The only two options I can think of is - replacing the strand altogether with one which was the original length before being cut for capping off OR if it was possible to restore the strand to its original length by splicing a length of strand onto the end. More about what I am planning on my blog post. peterdow.wordpress.com/2020/02/11/electrically-de-icing-the-queensferry-crossing-cable-stayed-bridge/
@@peterdow1541 The anchor has tapered holes with wedge grips that act as a one way grip...they can pull any cable any time tighter and then just let it off and it will stay there. They dont cut them off flush but leave enough sticking through for the cable puller to do its job next time....I believe that they were re tightening the cables that ran through the concrete on that walkway in Florida when it collapsed
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Lovely, I just started structural Engineering and this is super helpful
About 2:18 "If needed, down the road, 10 or 20 years, if the bridge starts to sag a little bit, we can pull on them and stress them again". What, AFTER 2:49 "the strands will be cut", for capping off, you still have enough length of protruding strand to get a grip on with tools to restress it? What, with the same tools? Or is a different procedure required to restress a strand that has been cut for capping off? Is there is a danger when restressing a cut-off strand that if you lose your grip on it with tools, the strand will contract back inside the cable and you can't get a hold of it again? How many people actually have experience of restressing cut-off strands? More or fewer than have walked on the moon? Is there a video of someone restressing cut-off strands because I would very much like to watch that video?
When strands already cut, there is still enough length to do re-stressing with the same equipment. There is also another procedure of re-stressing, when you pull not the strands one by one, but the whole bundle of strands.
If for some reason you lost one strand (slippage or break), there is also procedure of replacement.
@@anatolybabadzhanov6866 Thanks. What I'd really like to know how to do is how to do this on a bridge built some years ago - release a strand from the anchor block so that work can be done to electrically insulate the released strand from the anchor block - and then get the strand back through the anchor block when it is now TOO SHORT to simply manually thread it through.
The only two options I can think of is - replacing the strand altogether with one which was the original length before being cut for capping off OR if it was possible to restore the strand to its original length by splicing a length of strand onto the end.
More about what I am planning on my blog post.
peterdow.wordpress.com/2020/02/11/electrically-de-icing-the-queensferry-crossing-cable-stayed-bridge/
@@peterdow1541 The anchor has tapered holes with wedge grips that act as a one way grip...they can pull any cable any time tighter and then just let it off and it will stay there. They dont cut them off flush but leave enough sticking through for the cable puller to do its job next time....I believe that they were re tightening the cables that ran through the concrete on that walkway in Florida when it collapsed