Bridge collapse on M20

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Discussion

Muncher

12,219 posts

250 months

Sunday 28th August 2016
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From the CCTV the road looks ready to open, the standing half of the bridge is still there.

davepoth

29,395 posts

200 months

Sunday 28th August 2016
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Muncher said:
From the CCTV the road looks ready to open, the standing half of the bridge is still there.
Seems fine to me. That side won't have been damaged and it's essentially a separate structure anyway - this is the sort of thing:


SilverSpur

20,911 posts

248 months

Sunday 28th August 2016
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vikingaero said:
I think this picture gives a good perspective of the incident:



Look at the rear doors of the white trailer for reference height and look at the height of the jib in relation to the concrete structure. The low loader may be low but there may be several models of the excavator ranging from small to large. If the Auto Renovations is contracted to move the plant then maybe they used an agency driver with little experience?
This picture, when you take into account how the other side of the bridge support definetly sweeps down to the lowest height over the hard shoulder, proves to me that the crane was maybe just inches above the minimum height of the bridge support. Perhaps if he was in lane one he'd have squeezed under it.

cahami

1,248 posts

207 months

Sunday 28th August 2016
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Would the HA be allowed to release the footage they have of it happening ? It would certainly safe some bandwidth

twister

1,451 posts

237 months

Sunday 28th August 2016
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SilverSpur said:
This picture, when you take into account how the other side of the bridge support definetly sweeps down to the lowest height over the hard shoulder, proves to me that the crane was maybe just inches above the minimum height of the bridge support. Perhaps if he was in lane one he'd have squeezed under it.
In these side-on pics the flatbed trailer appears to have a fairly obvious nose-down attitude. Assuming this is due to the sudden appearance of a large chunk of bridge further up the trailer bed and not how the trailer actually does sit when loaded normally, then the top of the digger would have been even higher than it appears to be now...

Nickyboy

6,700 posts

235 months

Sunday 28th August 2016
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twister said:
In these side-on pics the flatbed trailer appears to have a fairly obvious nose-down attitude. Assuming this is due to the sudden appearance of a large chunk of bridge further up the trailer bed and not how the trailer actually does sit when loaded normally, then the top of the digger would have been even higher than it appears to be now...
I'd say with 170 tons sat on it i would have a nose down attitude too

I still reckon the dumper was punted back slightly as the bridge fell and pushed the arm of the digger down slightly

ALawson

7,815 posts

252 months

Sunday 28th August 2016
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Vaud said:
Who is it costing millions per hour?
My understanding is that the HA get paid per lane of motorway, on a sliding basis on time of day, day of week etc from the Government (or whoever, it doesn't matter).

The HA will put out to tender a maintenance contact for that section of road (or that motorway will be part of another section of motorways). Amey-Ferrovial, Balfour Beatty for example.

Those contractors are then incentivised to keep the lanes open at all times, maintain the roads etc. They also take the risk of accidents, normally any accident on the motorway the insurance company will pick up the costs. So don't have an accident on a motorway as the cost are simply staggering.

So in this case, whoever has the maintenance contract will loose revenue from the road being closed. Which will then get passed on. I expect that the haulage companies insurance will have to pick up the bill for this, which is probably in the order of £24m (easily £1m per hour from memory of working on the M25 DBFO tender). Delay and disruption on other parts of the network (similar to Network Rail delay minutes) may get passed on.

This obviously excludes the motorbike riders claim, cost to demolish and then reconstruct the footbridge.

This will also result in a massive review of all similar structures across motorways and dual carriageways I would imagine.

On another matter the duck jib still looks lower than those massive Asda lorries you see driving about.

Still cannot believe no one got killed.

turbobloke

104,009 posts

261 months

Sunday 28th August 2016
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News reports this afternoon stating (confirming) that the bridge was indeed hit by the HGV carrying the digger, not that this will be news to everyone! Even so this was the first bulletin I've heard which made it clear.

greygoose

8,269 posts

196 months

Sunday 28th August 2016
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Impressive work to get the motorway reopened so quickly, perhaps the lorries being under the bridge saved the carriageway from being damaged?

Vaud

50,597 posts

156 months

Sunday 28th August 2016
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ALawson said:
My understanding is that the HA get paid per lane of motorway, on a sliding basis on time of day, day of week etc from the Government (or whoever, it doesn't matter).

The HA will put out to tender a maintenance contact for that section of road (or that motorway will be part of another section of motorways). Amey-Ferrovial, Balfour Beatty for example.

Those contractors are then incentivised to keep the lanes open at all times, maintain the roads etc. They also take the risk of accidents, normally any accident on the motorway the insurance company will pick up the costs. So don't have an accident on a motorway as the cost are simply staggering.

So in this case, whoever has the maintenance contract will loose revenue from the road being closed. Which will then get passed on. I expect that the haulage companies insurance will have to pick up the bill for this, which is probably in the order of £24m (easily £1m per hour from memory of working on the M25 DBFO tender). Delay and disruption on other parts of the network (similar to Network Rail delay minutes) may get passed on.

This obviously excludes the motorbike riders claim, cost to demolish and then reconstruct the footbridge.
Thanks. Every day is a school day.

red_slr

17,266 posts

190 months

Sunday 28th August 2016
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They left the other half hanging there - cars driving under - seems like some common sense for once!

Sheepshanks

32,802 posts

120 months

Sunday 28th August 2016
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ALawson said:
Those contractors are then incentivised to keep the lanes open at all times, maintain the roads etc. They also take the risk of accidents, normally any accident on the motorway the insurance company will pick up the costs. So don't have an accident on a motorway as the cost are simply staggering.

So in this case, whoever has the maintenance contract will loose revenue from the road being closed. Which will then get passed on. I expect that the haulage companies insurance will have to pick up the bill for this, which is probably in the order of £24m (easily £1m per hour from memory of working on the M25 DBFO tender). Delay and disruption on other parts of the network (similar to Network Rail delay minutes) may get passed on.
I'd be pretty astonished if that sort of cost is recoverable from the truck's insurer.

ATTAK Z

11,124 posts

190 months

Sunday 28th August 2016
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red_slr said:
They left the other half hanging there - cars driving under - seems like some common sense for once!
Wait till it rains !

ALawson

7,815 posts

252 months

Sunday 28th August 2016
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Trucks insurer will probably stop paying out at £10m in all likelyhood.

Iva Barchetta

44,044 posts

164 months

Sunday 28th August 2016
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greygoose said:
Impressive work to get the motorway reopened so quickly, perhaps the lorries being under the bridge saved the carriageway from being damaged?
Makes a change.

I'm surprised the road didn't stay closed for a week whilst they messed about making decisions.

Digga

40,349 posts

284 months

Monday 29th August 2016
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Iva Barchetta said:
greygoose said:
Impressive work to get the motorway reopened so quickly, perhaps the lorries being under the bridge saved the carriageway from being damaged?
Makes a change.

I'm surprised the road didn't stay closed for a week whilst they messed about making decisions.
We're it a planned demolition,mother have the bridge dropped and pulverised (usually overnight) within hours. The experts don't mess about.

I do wonder, looking at some of the other pictures posted up, whether the truck was loaded too high or there was a cock up with the bridge height? As others pointed out, the pedestrian bridge does drop across the carriageway. Will be interesting to find out.

CAPP0

19,600 posts

204 months

Monday 29th August 2016
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Digga said:
I do wonder…...whether ………. there was a cock up with the bridge height?
That section of the M20 was opened in 1971, and the bridge connects two sections of another road which presumably ran straight through beforehand, so truer will have been a bridge there since it opened. I've lived in the area all my life and the bridge has been as it is for as long as I can remember; it may or may not be the original but I'd be very surprised if it hasn't been there in its current form for at the very least 15 years. It would be quite extraordinary if the height was wrong and they had just winged it and got away with it for that long.

Halmyre

11,211 posts

140 months

Monday 29th August 2016
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CAPP0 said:
Digga said:
I do wonder…...whether ………. there was a cock up with the bridge height?
That section of the M20 was opened in 1971, and the bridge connects two sections of another road which presumably ran straight through beforehand, so truer will have been a bridge there since it opened. I've lived in the area all my life and the bridge has been as it is for as long as I can remember; it may or may not be the original but I'd be very surprised if it hasn't been there in its current form for at the very least 15 years. It would be quite extraordinary if the height was wrong and they had just winged it and got away with it for that long.
I wouldn't be surprised. The Arkleston Road bridge over the M8 near Renfrew suffered from more than its fair share of 'strikes', my lorry-driving dad (who never hit it himself) always reckoned it was noticeably lower than any other bridge on the motorway. It was raised by 150mm in 2009, 40 years since it was built, to "bring it into line both with current standards and other bridges along the M8".

Iva Barchetta

44,044 posts

164 months

Monday 29th August 2016
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Halmyre said:
I wouldn't be surprised. The Arkleston Road bridge over the M8 near Renfrew suffered from more than its fair share of 'strikes', my lorry-driving dad (who never hit it himself) always reckoned it was noticeably lower than any other bridge on the motorway. It was raised by 150mm in 2009, 40 years since it was built, to "bring it into line both with current standards and other bridges along the M8".
Assuming this one had its low height on warning signs that some ignored.

Trif

748 posts

174 months

Monday 29th August 2016
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Iva Barchetta said:
Assuming this one had its low height on warning signs that some ignored.
And what are you going to do? Slam the brakes on? You have no where to go unless they close the motorway. I'd expect there to be a minimum height which all bridges conform to.