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I’m an ex rigger with large cranes. A quick look before the accident sends warning bells…it LOOKS wrong and experience tells me it usually is. Crane positioning and size difference stands out. The pontoon is very unstable….anyway my comments mean nothing to anyone. All I know is I hope the chief engineer on this job ran to the dole queue after that almighty balls up!!

This was doomed before they turned up on site, it was never going to work. Narrow floating pontoons and two different size cranes, in effect competing for the load. Bonkers. I think the planning team must have got bonged up in a "coffee" shop and completely lost their grasp of basic physics.

Is there a load decrease on the left crane instead of the right? Just exaggerate that the left crane turns furher than the load rotates indeed further and further underneath the right crane which explains why the right crane starts to rotate first. Is there by the way any video evidence that the left crane indeed rotates down due to less uplift by its barge?

Yoe uuuhh, speake english ferry well

everybody seems to have a idea about this failure

For fuck's sake, learn to write proper English before you post any more stupid videos like this one!

De windbelasting was best hoog die dag en de windkracht grijpt aan op het hoogste punt van de kraan resulterend in maximaal moment op de pontonvloer die vervolgens gaat kantelen om nog meer hefboom/doorzwaaieffect te leveren... patsboem!

Heb nog nooit kraan machinisten zo snel zien draaien met zware lasten. Dan kun je niet meer terug en evalueren en/of bijsturen. Ver voordat het verkeerd ging kon je al zien dat de boot scheef ging hangen. Er was een probleem met een kabel en ook dan ga je terug. Te weinig toezicht en communicatie ... mensen liepen gewoon weg tijdens het draaien.

Ex rigger,crane worker here.......sometimes it just dont look right....this was one of those times...even if the calculations had been done...too many pivot points and in water...mmmmm glad no-one was killed.....get the vacuum cleaner out though!

Ich glaube auch, dass ein Seilversagen vorliegen könnte. Allerdings im Zusammenspiel mit dem Deck. Begonnen haben dürfte das Ganze schon vor Jahren, durch Eintritt von Wasser in die Strebe an der Pylonspitze. Es kam in einem begrenzten Bereich durch Korrosion zu einer Querschnittsverminderung der Stahlseile. Die Stahlseile wurden dadurch in diesem Bereich über ihre Streckgrenze belastet. Risse im nicht mehr vorgespannten Beton der Strebe konnten nicht gesehen werden, da diese kunststoffbeschichtet war. Das auskragende Deck übernahm immer mehr die Traglast der südöstlichen Strebe. Durch diese einseitige Belastung entstand eine Torsionsspannung im Deck. Der schon Monate vor dem Einsturz sichtbare Riss im Asphalt, und zwar ausgerechnet nur im Bereich der Strebenanbindung, dürfte ein Indiz für diese Spannungen sein. Ich glaube, dass das schon an seine Grenzen belastete Deck, beim Überqueren eines Schwertransports mit einem Gesamtgewicht von über 40 Tonnen und eines direkt folgenden LKW mit über 10 Tonnen gebrochen ist. Die schon geschwächte Strebe übernahm wieder die volle Last und brach an ihrer schwächsten (korrodierten) Stelle. i.postimg.cc/wM166yfZ/strallocorroso.gif

Finalmente il suo video spiega come è crollato il ponte.!!!!

ohhhh man, was ein scheiß

Könnte man eigentlich die Heckfläche des LKW vom Aufnahmeplatz aus sehen, wenn er tatsächlich in den Weihnachtsmarkt abgebogen wäre?

Hast recht - ist unabhängig von der anderen Beleuchtung und geht hinten auch aus. Ich nehme mal an, mehrere Stromkreise - wenn der Stern vorne und hinten mit LEDs bespickt ist. Dass die obere Hälfte im Dunkeln liegt, zeigt ja auch, dass es mehrere Stromkreie sind. Man müsste mal so einen Stern aus der Nähe sehen.

@Peter Randeler Also ne Frage hab ich zu deiner Gegenüberstellung. Wieso ist bei der Weihnachtsbaumbeleuchtung, bzw. deren ausfall, beim Kontraste Video der ganze Baum aus, bei dem Bild Material bleibt aber der Stern auf der Spitze an? Da hab ich schon mehrfach hin und her gezappt. Da komm ich aber nicht ganz hinter. Kann es sich da um Reflexionen handeln, so das es nur so aussieht als würde der Stern noch leuchten? (In deinem Video bei Sekunde 24 zu sehen)

Also mal ganz ehrlich! Haben da welche anderen ins Gehirn geschissen???!!! Moment mall....tote gibts und ist fakt,....verletzte gibts und ist Fakt,....Zeugen gibts...und so weiter. Aber warum zum teufel gibt es immer und immer wieder *Zensiert* die da was anderes ersehen wollen?! Die Geschichte verdrehen wollen? Oh...ich weis die Katholiken vom Planeten Geldamax haben das inszeniert. Meine Fresse. Sorry aber genau so bescheuert klingen etliche Theorien von so *Zensiert*. Echt mal. Punkt1. krimineller Migrant wurde abgelehnt was zu dieser tat führte. Wie unzählige andere Straftaten, Vergewaltigungen mittlerweile von abgelehnten praktiziert worden sind. Ende. Das wars! Kein huibuhh...kein Gespenst oder sonst irgendeine Scheiße. Aber freut euch denn mit dem Compact of Migration wird überhaupt keiner mehr Abgelehnt. Na dann viel Spass mit all den "Zeitbomben" Fakt ist... Videos echt. Geschehen echt. Punkt.

Ein hoch auf die Realität, auch wenn sie in diesem Fall eine beschissene und grundtraurige ist. Es gibt halt bekloppte und böse bzw. Verblendete Menschen die Terror gut finden und auch umsetzen. Jeder Soldat im Krieg ist auch nicht besser, wenn er mit Drohnen oder panzern oder Maschinengewehren Leute niedermäht. Für so ne Verschwörungsheinis ist die Realität scheinbar nicht ertragbar. Sie halten die Lügen der Faker vom Geheimdienst für glaubhaft, da sie von sich auf andere schließen.

this is just STUPIDY. sorry, nothing else. what's next? I balance on a big ball and try to cook meanwhile???

Why were the cranes closer to the edge of the barge and towards the opposite end of barge? They could have used the tug boat as anchor/counter weight if they would have situated them closer to the front or like high rise cranes .. they should have place counter weights on the opposite side of the barge to counter the weight and movement - I agree having 2 mismatched cranes was not a good idea- soo many mistakes on this one. I can't believe someone signed off on this. This is what happens when you hire like minded people or relatives.

seams everyone's a crane operations special here. ... LOL

The crane to the rear is far to close to the edge of barge where it pushes the barge down and dips to far carrying the weight over with it to low and of course this was already a dangerous idea on a liquid boiyant medium

I was there that day. and it was pretty wind. and the ponton was a bad place to start from anyway.

I cant believe the Crane Operators allowed this ??? I'm no Engineer but that was fucking insanely moronic. about 10 to 12 Million $'s worth of Crane condemned to parts salvage.

the news story: www.rt.com/news/311458-crane-collapse-hollande-house/

Pourquoi ne pas avoir stabiliser les deux barges? Deux pieux part barge enfoncer jusqu'au fond aurait éviter se carnage !!!

If they came and ask me if that would work before they attempted it i could have told them it's a fail... im really curious are the people responsible for the operation really that stupid to think two cranes on a narrow boat are not going to fall and destroy shit... im losing faith in humanity...

I'm guessing they didn't put the guy in charge of the operation ...in charge of the clean up.

The crane driver obviously wasn't really aware of what the challenge of this job was, but you should put more emphasis on the fact that in the moment the smaller crane started rotating with most of the load hooked on, its pontoon also inevitably bends over due to the shift of the center of gravity. This is what makes the whole situation fatal. A tandem lift is always something one should prepare with painstaking care, but NEVER based on the edge of two pontoons floating freely in the water without any ground suspension. I wonder how such a serious mistake could happen in a country with so much experience in offshore construction.

Two different mobile cranes on two pontoons on two different positions. I think also the wind was a factor. It was 3 a 4 beaufort directly on the bridge.

I don't like and want to point fingers at persons.Always easier for people standing by to judge.But if you have played a bit in your past (I'm not a PS IV generation....)with toys and cranes and what we used to have in EU (Meccano or Fisher Technik) you can see that was meant to go wrong.Like the publisher of this movie already implied,mobile cranes for solid ground used on a movable pontoon is not a great start.Are the pumps be able to"counter" ballast in time when the cranes are swinging?On seagoing ships loading and unloading their cargo you have a ballast and loading computer on board ,calculating from beginning till end giving all strength conditions of the vessel,list,bending moments etc. Draught of the pontoons,:I have no idea but guess not even 15% of it is in the water compared to what(crane and bridge) is above the water For me not very clear to see is when or what happened first,breaking or swinging uncontrolled at a speed way too high. It's not a job very rare in The Netherlands but there are unfortunately a lot of "managers" (bright young graduates) in charge who are able to find the best solution money-wise...cheap CHEAP CHEAP.And who decided to ask a company to do this kind of job and convinced others that these are the correct people to do it should be heard as well and not hide him/herself behind the performing company who said :yes we can do that. I don't believe that just a mayor of a small town kind decide on his own who will do the job.Director ship of the province has civil engineers and they most probably are responsible of how it will be done.Crane company surely has to do all the calculations and check their possibilities with the equipment and circumstances.Who ever made this performance and showed the "masterplan"to the involved parties will be asked questions no doubt.All parts of the crane etc. will be checked afterwards,material analysis,welding seems,butts and so on. In any case the old bridge has been removed before as well so that went OK(?) It will take time to investigate what has happened actually,so very easy to say this and that he did ,she did.I don't know the features of all the used equipment but it is in my opinion just very underestimated.....The cranes on 2 pontoons gave me that first impression.

No job for civil engineers: This is a job for Heavy Lift transporters like Jumbo Shipping.........penny wise pound foolish.........

Great and clear analysis Peter. A contributing factor might have been that there was apparently hardly any safetymargin on the smaller crane. At the boom's lifting angle, the smaller (400 ton-liebherr) crane is rated lift no more than approx 150 ton. The bridge weight is 175 ton. Looking at the crane lay-out, the smaller crane end up lifting more than half of the bridge's weight. Experts say that the crane may have gone in an emergency mode where the operator had no control anymore and the crane computer takes over as a safetymeasure. This safety may have switched on due to the rotation of the pontoons or due to unpredictable and unequal lifting forces. The crane operator had no time to override the safety and to drop the bridge back on its original ponton. Witnesses say the operator left the crane before the bystanders were even able to see something was starting to go wrong. There is one thing that puzzles me, and that is the sharp opposite jerk of the boat at the far end about when the bridge hits the boom of the crane. Did one of the mooring ropes break? Although the ponton was tilting, it looks unlikely that this would give a major additional stress on these ropes the way they were attached. Still there was apparently a (another) force acting on the boat...

True story. I ve write on you tube the same story in Dutch. my English is not so good. I dont think you can calculete what a pontoon can do. To complicate, because speed is also a factor. It was a stupid idea, the old bridge was removed with a crane on the road. Why they don t do it like that again?

Everybody in the Netherlands thinks the crane just collaps, but is not the whole truth. He collaps because it was broken (at 2:27)

Looking at the basic video footage, the problem appears to be an inherent lack of stability in the pontoon/barges; a secondary issue with the smaller crane appearing to slew too fast; and a further issue that neither crane appears to have been lashed to the barge.Once the weight of the load is taken by the hook, there is a virtual shift in the combined centre of gravity from within the barge (and an initially stable equilibrium) and the centre of gravity (CoG) moves towards the jib-end of the crane. This virtual shift may well have reduced the metacentric height to zero (effectively, zero stability) and once the slewing of the load commenced it would have been sufficient to destabilise the whole rig. The resultant loss of stability of the smaller crane/barge rig has caused the initial collapse - which, in turn, has directly affected the larger crane.There may have been some slack ballast tanks (part-filled) whose free surface moment may not have been allowed for in any stability calculations by the engineers.Obviously, we do not know what the initial state of stability is/was, nor what presumptions were made by the engineers, if any, of the weight transfer.There may also have been problems with the ballasting of the barge tank systems, and any unaccounted free surface effect would detrimentally affect the stability of the barge.Sadly, it does not look good from a professional point of view, and there appears to hae been many fundamental errors.

True, this is why it happend. It was also mine opinion one month ago.

You should look closer to the video. They start by lifting the load, then both cranes tilt the booms up and the load starts to move sideways. A few seconds later the right smaller crane turns left, this is the point things start to go wrong and people panic. The load starts to move faster toward the cranes and the pontoon starts to tilt moving the boom top leading up to the collapse.The big question is why only the smaller crane turns left just after the boom tilt maneuver of both cranes. Was it the driver, or the crane's computer responding to the load shift and/or tilting of the base (level of the pontoon) Also the smaller crane was closer to the load making it more sensitive to load center stability which made things worse in my opinion.

NIce theory, but the assumption that the excentrically loaded pontoon will lower at the side of the 700t crane is not in accordance with the footage. Further, because of the weight of ballastwater, it is not necessary that the pontoon lowers at the side of the crane. It all depends on the distribution of loads on the pontoon.

They did a similar lift some time ago: ruclips.net/video/jSh8CYSYEAc/видео.html So there was experience of having large cranes on barges. Makes this even more strange.

eeee u can hear the wind on the recording it saying leave it and run

oooo also it high in the air .maybe top of it 20 meters up it will want like a sail turn away from wind

its gone with the wind . wat b the force in tons if a strong gust of wind hit that big steel sail i wonder . maybe 500sg meter sail. once it started moving b like stopping a train. 180 ton weight of bridge part

the bridge section got hit by a gust of wind. look at trees in background . it became a huge 200 ton sail . should of had strong guide ropes mmmm

shoulda had american engineers

The operator was not swing too fast, the barge began to turn and he had no chance to stop that progress. Are you a crane professional? I guess you don't...

The section is in the state of an "open bridge" and I think it was the planned way to insert it into the rotation joint. But I am curious, whether the maneuver of bringing the bridge section to the other side of the vessels would have worked without difficulties. It would had to pass inbetween those two cranes, avoiding any excentricity.