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It would be interesting to read the method statement.
Possibly they will unearth it from the waste bin it was deposited in, then open it and read it!
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JohnMurray wrote:It would be interesting to read the method statement.
Possibly they will unearth it from the waste bin it was deposited in, then open it and read it!
Why do you say they weren't following a method statement?
The larger of the two is large even for mobile cranes (it has the outrigger configuration, and I think the axle configuration too, of a Demag AC1600, which is a 500 tonne lift, of which there aren't very many about). The one that toppled first is a smaller model, but it's still at the large end of mobile crane size range. Using such equipment suggests a lift that will be planned a reasonably long time in advance, and tends to imply a reasonably planned lift.
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Ladies Gents this is in Holland and they are very good at planning lifts through having 2 of the biggest heavy lift crane companies in the world.
This is a Tandem lift and all about weight transference between the cranes which has to be strictly controlled. If it is not serious consequences?
We could be discussing equipment failure ,accessory failure or lack of control of the cranes. It is far to early and nearly impossible to determine at this stage why.
Fortunately no fatalities but quite a lot of possibly seriously injured.
Ta Alex
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I'm guessing the fact it appears to be taking place on pontoons will be the major contributing factor? Not sure how easy it would be to find out/calculate the SWL of them and then factoring in the effect of the movement of the cranes and their load on top of it.
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alexmccreadie13 wrote:Ladies Gents this is in Holland and they are very good at planning lifts through having 2 of the biggest heavy lift crane companies in the world.
This is exactly why I am so surprised it happened here. Plus Holland are leaders in marine civil engineering, so the lifting & replacing of a relatively simple load (bridge part)- albeit from a barge and in a confined space - is not unusual in a country which is largely reclaimed land below sea level.
Lets hope any investigation is made public (and in English!!)
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This one is unusual in that the larger crane has overturned. It may well be therefore that the pontoon use has affected the dynamic loading pattern. We shall see soon we hope.
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boblewis wrote:This one is unusual in that the larger crane has overturned. It may well be therefore that the pontoon use has affected the dynamic loading pattern. We shall see soon we hope.
In the video I saw, what looked to be the larger of the two cranes (the one closest to camera at the start here http://www.bbc.co.uk/news/world-europe-33764760) only toppled when it was hit by the falling deck panel after the first crane was already most of the way to the ground. It seems to me that the deck panel knocked / dragged an outrigger off the side of the barge.
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Rank: Super forum user
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Rank: Super forum user
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Rank: Super forum user
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JohnMurray wrote:https://www.youtube.com/watch?v=MHlfK0Ed8Zk
That's the same video as the BBC used, and so my same comment applies - the larger of the two cranes only toppled when its outrigger was pushed off the barge by the falling bridge deck panel.
The aerial photo on http://www.constructionw...turns-to-crane-collapse/ confirms that the crane that first toppled was indeed the smaller of the two. The larger still looks like a Demag AC1600 to me, I don't recognise the smaller - it's some years since I was actually specifying/hiring cranes.
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