OT The Forth Bridge

I suspect that the problem here is that the suspension part of these bridges aren't made from single length cables, but from jointed solid bars

I guess that the joints suffer from serious fatigue over the years

tim

Reply to
tim.....
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There have been some daft suggestions on repair methods. There is only one way - some Dexion and self tapping screws - but make sure suitable sized washer are used so that the screw heads don't pull through the Dexion. Finish off with Hammerite to keep the damp out.

Reply to
DerbyBorn

The only new school i have seen around here is being built on the playing field and they intend to put the playing fields where the old one is.

Reply to
dennis

I very much doubt it. The Forth Road Bridge is 2.5 km long. That length would require many Bailey bridge trusses with many vertical piers supporting them. The piers would need to be built on foundations on the river bed. The alternative would be to use floating pontoons to support the trusses (spans). That would be a very far from trivial engineering task.

Each Bailey truss is up to 60 metres long. So unless modern ones are longer that would mean up to 42 trusses supported by 41 piers and/or pontoons.

As far as I know Bailey Bridges were never used to bridge such a wide stretch of river/estuary.

According to this:

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Modern Bailey bridges Bailey bridges are in regular use throughout the world in the 21st century. Some exceptional examples include: The longest Bailey bridge was put into service in October 1975. This 788 metres (2,585 ft), two-lane bridge crossed the Derwent River at Hobart, Australia. It was opened around a year after the Tasman Bridge disaster destroyed the only river crossing and effectively divided the city in two.

788 metres is a bit less than a third of the length of the Forth Road Bridge.

Any temporary replacement for the existing bridge would need *not* to block boats and ships going up and down the river. That would include vessels to and from the Rosyth Dockyard.

Reply to
Peter Duncanson

Reply to
Peter Duncanson

I once had a new windscreen fitted by the insurance and the guy said there wasn't really enough metal left to fit it to. But he did it, I added some parcel tape and aerosol paint, and it passed the MOT.

Bill

Reply to
Bill Wright

I have it on good authority that once the grease have come out of the core, it's impossible to adequately apply more - even immersing the rope in heated liquid grease is not enough[1]. However, I suppose applying more outside may stop the inside grease washing/leeching out.

[1] Reading Uni Mech Eng dept, specialist in wire ropes.
Reply to
Tim Watts

But they can dehumidify them...

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And the cables aren't wire ropes, so far as I can tell. More parallel bundles. But I could be wrong.

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Reply to
polygonum

En el artículo , polygonum escribió:

I think the cable is separated out for anchorage, but once it leaves the anchorage chamber it's twisted in the same way as normal steel wire. Happy to be corrected, though.

Reply to
Mike Tomlinson

To practicalities. My guess is FRB may be closed rather longer than initially said. We'll see. In the meantime, we travel from Aberdeenshire to North Essex a couple of times a year, usually south via Perth, FRB, around Edinburgh to A1, Berwick, Newcastle etc. to A14 then M11 etc.

No plans to travel again until March, but there may just be a reason to travel before then, so planning ahead.

South to Perth, cut across to Stirling, south to Glasgow then M74, Carlisle, but where to turn east again? Penrith over to the A1, or keep south passing Birmingham, picking up A14 across to M11?

Any thoughts? The closing of FRB is going to have far reaching effects, so perhaps wait and see how things pan out.

Reply to
News

A relative travelled from Invergordon to Stoke on Trent using part of the route you propose without a problem and without delays on Friday.

Reply to
Martin

Excellent, thanks. Have not been to Invergordon yet, although love the Black Isle.

Reply to
News

The strands are individually drawn across the bridge by pulleys.

There is no twist.

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Chris

Reply to
Chris J Dixon

a500/50 Stoke to Loughborough

tim

Reply to
tim.....

En el artículo , Chris J Dixon escribió:

Thanks. Maybe there should have been. The Brooklyn Bridge was built using twisted steel cable (Roebling's "steel rope") in 1870. That makes it 145 years old, so it's outlasted the Forth by a factor of three.

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Reply to
Mike Tomlinson

I must admit I thought that the strands were small twisted cables but this picture (and others on the net) show that it is solid wires just bundled together.

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Tim

Reply to
Tim+

In message , tim..... writes

Then around Leicester and A47 to A1?

Reply to
News

The Golden Gate bridge cables seem to be made up of lots more much smaller stands (again, not twisted).

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Reply to
Andrew Gabriel

I believe it is supplied as individual strands, which are ruler straight when they come off the machine that makes them. I have a friend who worked in the factory and he nicked some of it. It's useful stuff but very hard to drill or file.

Bill

Reply to
Bill Wright

There's not much in it really, so I would look at likely congestion on the two routes. The A66 might be closed by snow in March. The northern part of the A1(M) is generally better now than it used to be, thanks to upgrades.

Bill

Reply to
Bill Wright

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