Were you just browsing crane accidents? That must have been terrifying.
Original link: http://www.bbc.co.uk/news/world-asia-33173549
Frightening, hope no one was killed. We had a drag line at work go in the river a few years ago killing the driver 🙁
Having two mobile cranes on a floating barge and not secured down is a accident waiting to happen, just hope nobody is hurt.
No one was hurt in the incident.
20 hurt in Alphen aan den Rijn
[url= http://www.regio15.nl/index.php/nieuws/lijst-weergave/32-ongevallen/23266-bouwkranen-ingestort-alphenaandenrijn ]http://www.regio15.nl/index.php/nieuws/lijst-weergave/32-ongevallen/23266-bouwkranen-ingestort-alphenaandenrijn[/url]
There are at least 20 people injured, some seriously.
You can't trust the media? Who knew.
It was at the bottom of the original link. You simply read Three Fish's link and drew your conclusions from that. Totally different incident.
It didn't help that Three Fish put "Original link" as though it was the source of the OP
http://www.rt.com/news/311458-crane-collapse-hollande-house/
last video on page shows the damage done.
project - Member
Having two mobile cranes on a floating barge and not secured down is a accident waiting to happen, just hope nobody is hurt.
Ignore the not secured down bit, who did the stability (turning moment) calcs! Looks like no one unfortunately.........
It didn't help that Three Fish put "Original link" as though it was the source of the OP
The OP contained the link to the Chinese crane collapse, not the Dutch. It was rather confusing to say the least. I edited my post when the OP edited his to the correct link, though I didn't quite make that clear enough.
The OP contained the link to the Chinese crane collapse, not the Dutch. It was rather confusing to say the least. I edited my post when the OP edited his to the correct link, though I didn't quite make that clear enough.
True - the bloody bbc news auto move on to the next story feature caught me out initially.
Ignore the not secured down bit, who did the stability (turning moment) calcs! Looks like no one unfortunately.........
Basic engineering principles show that if you apply a weight to the end of a crane jib, the crane will try and tip forward thats why large ballast packs are added on the rear of the crane, but then when you place 2 large cranes on a floating pontoon/barge and fail to secure them down the force exerted onto the barge will cause it to tip, making the cranes slide off the barge, just a few degrees list on the barge will result in the cranes toppling/sliding off the barge.
It didn't help that Three Fish put "Original link" as though it was the source of the OP
Indeed.
FWIW I didn't post with malice or owt. Think more this kind of approach...
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Well, that was the single best/worse display of mindless stupidity that I've seen in a few years.
Hope no one was killed.
Sadly I suspect that unless they were very lucky there will be fatalities looking at the videos.
Having two mobile cranes on a floating barge and not secured down is a accident waiting to happen, just hope nobody is hurt.
I dare say the Dutch know a fair bit about working from pontoons and barges. It looks to me as though the lift went wrong. The load twists and hits one crane, falls to the ground and brings down the other crane. The barge tilting wouldn't help of course, but I reckon even on a fixed base once they lost control of the load, the cranes were going over anyway.
Basic engineering principles show that if you apply a weight to the end of a crane jib, the crane will try and tip forward thats why large ballast packs are added on the rear of the crane, but then when you place 2 large cranes on a floating pontoon/barge and fail to secure them down the force exerted onto the barge will cause it to tip, making the cranes slide off the barge, just a few degrees list on the barge will result in the cranes toppling/sliding off the barg
I can't quite work out what they are trying to do but I think there are two seperate barges. Was the idea to lift and pull the barges apart as they swung round?
And the second crane is dislodged by the bridge deck hitting it i think although i imagine it was gojng in either way.
The Dutch are pretty handy at cranes and barges. They have form for lifting heavy things from or onto floating platforms.
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Still - somebody clearly ballsed up.
Seems to be no updates since the original news broke...the estimate of 20 injured seems to be based on how many could have potentially been in the buildings.
Why so quiet...could it be perhaps everyone is accounted for but they don't want to give false hope that there are no fatalities until they have moved the debris?
I always had the Dutch down as intelligent, resourceful poeple but the stupidity of what they were attempting amazes me. As somebody wrote above, what did they expect the barge to do when the load began to move outboard?
Have a really close look at that first video. The load hits the crane which then falls over - the barge doesn't move until later. That crane was going over even if it was on solid ground. The lift itself was poorly executed.
http://www.rt.com/news/311458-crane-collapse-hollande-house/
Have a look at the longer video above, the far crane takes the weight , and the rear rhs of barge shows a list to the right, this then causes the crane to slide dragging the nearest crane into the water, following the farest crane.
Some huge basic failures there.
Having spent the best part of 7 years watching Dutch people do double crane lifts of loads up to 12000 tons - they are good at, from the video it does look like the load hit one of the cranes..
Surely the most basic precaution that should have been taken was an exclusion zone for the public that extended beyond the reach of any collapsing booms?
It's thankfully rare, but even with my fairly limited knowledge of organising crane work, that looked like a piss poor lifting plan.
According to my Dutch girlfriend - the barge they were working on, was supported with ballast tanks. As the load moved, various pumps moved water and air, from one side of the barge to the other to keep things level.
It seems that either these pumps failed, or just couldn't work fast enough.