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| UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#41
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Bridge collapse
In article ,
charles wrote: In article , Dave Plowman (News) wrote: In article , Nightjar wrote: Maintenance of a bridge shouldn't be expected for 100 years or so,... There have been some significant exceptions - box girder bridges built in the 1960s needed major work within a fairly short time and a lot of structures built around the same time using high alumina cement crumbled, due to improper use of the material. With road bridges there is also the potential problem of impact damage. And, of course, the Forth Road Bridge. Went on a school trip to see it being built. Salt water doesn't nasty things to steel and iron. That is why the original Forth Bridge (rail) was continually being repainted. And has lasted rather more than 50 years. ;-) -- *If you try to fail, and succeed, which have you done? Dave Plowman London SW To e-mail, change noise into sound. |
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#42
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Bridge collapse
Dave Plowman (News) wrote:
In , wrote: In , Dave Plowman wrote: In , wrote: Maintenance of a bridge shouldn't be expected for 100 years or so,... There have been some significant exceptions - box girder bridges built in the 1960s needed major work within a fairly short time and a lot of structures built around the same time using high alumina cement crumbled, due to improper use of the material. With road bridges there is also the potential problem of impact damage. And, of course, the Forth Road Bridge. Went on a school trip to see it being built. Salt water doesn't nasty things to steel and iron. That is why the original Forth Bridge (rail) was continually being repainted. And has lasted rather more than 50 years. ;-) Yes, when it's obsolete it's frequently reliable! Being over engineered helped also. |
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#43
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Bridge collapse
On 06/08/2016 17:44, Fredxxx wrote:
Maintenance of a bridge shouldn't be expected for 100 years or so, so would fall on the body responsible for building it. A LA's notional timescale of action, tendering etc, would be very different from a rail company's. The Humber road bridge is suffering from corrosion inside the cable bundles. They have installed microphones that are connected to sensitive recording devices that listen for the ping when an individual strand breaks. From this they can deduce when to start imposing weight limits. Saw this on 'Coast' (I think). The original Severn Road Bridge needed extensive internal strngthening of the box sections after a similar design collapsed sowewhere down in West Wales, or the West Country during construction. |
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#44
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Bridge collapse
On 07/08/2016 13:41, charles wrote:
In article , Dave Plowman (News) wrote: In article , Nightjar wrote: Maintenance of a bridge shouldn't be expected for 100 years or so,... There have been some significant exceptions - box girder bridges built in the 1960s needed major work within a fairly short time and a lot of structures built around the same time using high alumina cement crumbled, due to improper use of the material. With road bridges there is also the potential problem of impact damage. And, of course, the Forth Road Bridge. Went on a school trip to see it being built. Salt water doesn't nasty things to steel and iron. That is why the original Forth Bridge (rail) was continually being repainted. It was British Rails inadequate painting schedule that caused most of the recent Forth Bridge problems. Now it has been done using a special paint developed for protecting the legs of North Sea Oil platforms. They claim that it will last 25 years. |
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#45
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Bridge collapse
On Tue, 9 Aug 2016 19:23:40 +0100, Andrew
wrote: On 07/08/2016 13:41, charles wrote: In article , Dave Plowman (News) wrote: In article , Nightjar wrote: Maintenance of a bridge shouldn't be expected for 100 years or so,... There have been some significant exceptions - box girder bridges built in the 1960s needed major work within a fairly short time and a lot of structures built around the same time using high alumina cement crumbled, due to improper use of the material. With road bridges there is also the potential problem of impact damage. And, of course, the Forth Road Bridge. Went on a school trip to see it being built. Salt water doesn't nasty things to steel and iron. That is why the original Forth Bridge (rail) was continually being repainted. It was British Rails inadequate painting schedule that caused most of the recent Forth Bridge problems. Now it has been done using a special paint developed for protecting the legs of North Sea Oil platforms. More the lack of a painting schedule. There was a complete halt to painting in the run up to privatisation and Railtrack continued the neglect. |
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#46
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Bridge collapse
On Tue, 09 Aug 2016 20:09:07 +0100, Chris Hogg wrote:
On Tue, 9 Aug 2016 19:20:39 +0100, Andrew wrote: On 06/08/2016 17:44, Fredxxx wrote: Maintenance of a bridge shouldn't be expected for 100 years or so, so would fall on the body responsible for building it. A LA's notional timescale of action, tendering etc, would be very different from a rail company's. The Humber road bridge is suffering from corrosion inside the cable bundles. They have installed microphones that are connected to sensitive recording devices that listen for the ping when an individual strand breaks. From this they can deduce when to start imposing weight limits. Saw this on 'Coast' (I think). ISTR something similar for the Saltash suspension bridge, between Devon and Cornwall at Plymouth. Perhaps it's a problem with all suspension bridges. The Forth road bridge is the same. It's certainly a problem with bridges of a particular age, from when they started making the cables in situ until they started making a better job of weatherproofing them. |
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#47
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Bridge collapse
The Humber road bridge is suffering from corrosion inside the cable bundles. They have installed microphones that are connected to sensitive recording devices that listen for the ping when an individual strand breaks. From this they can deduce when to start imposing weight limits. Saw this on 'Coast' (I think). ISTR something similar for the Saltash suspension bridge, between Devon and Cornwall at Plymouth. Perhaps it's a problem with all suspension bridges. The Forth road bridge is the same. It's certainly a problem with bridges of a particular age, from when they started making the cables in situ until they started making a better job of weatherproofing them. You'd have thought that they'd enclose them and pump oil along them or around them to preserve them better?. I know that the stay wires on TV masts are absolutely impregnated with a heavy grease for that same reason... Like the way old Mini sub frames used to rot the front ones never did all that Oil leaking from the engine and rear no oil never lasted any time at all.. -- Tony Sayer |
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