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#1
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Hammersmith Flyover to reopen to light traffic - BBC News
"Bruce" wrote in message
... Bruce wrote: A steady seepage of salt water into the structure, built in the 1960s, has weakened the structure, but engineers said it was now safe to take light traffic. But no, the cheaper but potentially very damaging rock salt was used, and this is what has caused the problems with the pre-stressing cables within the concrete structure. Presumably this isn't the only structure of this type on the road network though? Are many more due to be found before long? Paul S |
#2
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Hammersmith Flyover to reopen to light traffic - BBC News
"Paul Scott" wrote in message
... "Bruce" wrote in message ... Bruce wrote: A steady seepage of salt water into the structure, built in the 1960s, has weakened the structure, but engineers said it was now safe to take light traffic. But no, the cheaper but potentially very damaging rock salt was used, and this is what has caused the problems with the pre-stressing cables within the concrete structure. Presumably this isn't the only structure of this type on the road network though? Are many more due to be found before long? Found to have damage, I meant of course. Not just 'found'! Paul S |
#3
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Hammersmith Flyover to reopen to light traffic - BBC News
In message , at 12:41:12 on
Fri, 13 Jan 2012, Paul Scott remarked: A steady seepage of salt water into the structure, built in the 1960s, has weakened the structure, but engineers said it was now safe to take light traffic. But no, the cheaper but potentially very damaging rock salt was used, and this is what has caused the problems with the pre-stressing cables within the concrete structure. Presumably this isn't the only structure of this type on the road network though? Are many more due to be found before long? There were extensive repairs to the M6 viaduct in the Castle Bromwich area a couple of years ago, and the A14 flyover across Huntingdon station is widely regarded as being about to fall down. One of the bridges at the M6/M1 junction was replaced very recently. http://www.bbc.co.uk/news/uk-england-16460505 Not sure how many of these are salt related. -- Roland Perry |
#5
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Hammersmith Flyover to reopen to light traffic - BBC News
In message , at 12:36:40
on Fri, 13 Jan 2012, remarked: There were extensive repairs to the M6 viaduct in the Castle Bromwich area a couple of years ago, and the A14 flyover across Huntingdon station is widely regarded as being about to fall down. One of the bridges at the M6/M1 junction was replaced very recently. http://www.bbc.co.uk/news/uk-england-16460505 Not sure how many of these are salt related. Huntingdon viaduct already relies on extensive supplementary steelwork to support it. But why does it *need* the support? Is the underlying issue one of salt corrosion. -- Roland Perry |
#6
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Hammersmith Flyover to reopen to light traffic - BBC News
In article , (Roland Perry)
wrote: In message , at 12:36:40 on Fri, 13 Jan 2012, remarked: Huntingdon viaduct already relies on extensive supplementary steelwork to support it. But why does it *need* the support? Is the underlying issue one of salt corrosion. I don't think so. I think it's to do with the quality of the original concrete construction. -- Colin Rosenstiel |
#7
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Hammersmith Flyover to reopen to light traffic - BBC News
On Sat, 14 Jan 2012 15:34:09 -0600,
wrote: In article , (Roland Perry) wrote: In message , at 12:36:40 on Fri, 13 Jan 2012, remarked: Huntingdon viaduct already relies on extensive supplementary steelwork to support it. But why does it *need* the support? Is the underlying issue one of salt corrosion. I don't think so. I think it's to do with the quality of the original concrete construction. I don't think that it's just the concrete, it's a broader design concept than that; http://londonist.com/2012/01/will-so...th-flyover.php E&OE etc. JonH |
#8
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Hammersmith Flyover to reopen to light traffic - BBC News
In article ,
() wrote: On Sat, 14 Jan 2012 15:34:09 -0600, wrote: In article , (Roland Perry) wrote: In message , at 12:36:40 on Fri, 13 Jan 2012, remarked: Huntingdon viaduct already relies on extensive supplementary steelwork to support it. But why does it *need* the support? Is the underlying issue one of salt corrosion. I don't think so. I think it's to do with the quality of the original concrete construction. I don't think that it's just the concrete, it's a broader design concept than that; http://londonist.com/2012/01/will-so...wrong-with-the -hammersmith-flyover.php E&OE etc. Thanks for the link to an interesting article (with a few errors picked up in the comments) but I was referring to quite a different structure on the A14. -- Colin Rosenstiel |
#9
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Hammersmith Flyover to reopen to light traffic - BBC News
wrote:
On Sat, 14 Jan 2012 15:34:09 -0600, wrote: In article , (Roland Perry) wrote: In message , at 12:36:40 on Fri, 13 Jan 2012, remarked: Huntingdon viaduct already relies on extensive supplementary steelwork to support it. But why does it *need* the support? Is the underlying issue one of salt corrosion. I don't think so. I think it's to do with the quality of the original concrete construction. I don't think that it's just the concrete, it's a broader design concept than that; http://londonist.com/2012/01/will-so...th-flyover.php E&OE etc. Errors and Omissions Excepted?? There are plenty of potential errors in that article, but no omissions. Rarely have I seen someone make such a complex explanation of a very simple problem. Probably due to his lack of knowledge of this particular structure, the author seems to have wanted to cover all the possible problems in all possible concrete bridge structures. Perhaps he did omit two possibilities - cosmic rays and UFO impact. And then there's terrorist attack, so let's make that three. ;-) |
#10
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Hammersmith Flyover to reopen to light traffic - BBC News
On Fri, 13 Jan 2012 13:09:44 +0000, Roland Perry
wrote: There were extensive repairs to the M6 viaduct in the Castle Bromwich area a couple of years ago, and the A14 flyover across Huntingdon station is widely regarded as being about to fall down. One of the bridges at the M6/M1 junction was replaced very recently. I recall the Sunday Times getting excited about the M6 viaducts being at risk of collapse in Birmingham, must have been in the 1970s or '80s. The recent works are the second time they have had a thorough going over that I am aware of. The M6 bridge over the M1 was propped about 10 years ago. I don't know what weakened it: poor design, over-use or salt, could have been any of them. |
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