Crane Accident 250 ton

[xgtford]

if only we could travel back in time and see what really happened

[xgtford]

you've gotta feel for the crane driver though he must have shite himself when this happened hope he took a spare pair of pants to work.

[snappy]

Not the engineers fault yet . I Can't remembr the name of the trade but there is supposed to be a guy that walks around with an xray type machine that looks like a metal detecter that is supposed to look for weaknesses in the slab . If he had been through and found nothing id say the blame falls on him.

[The Mighty Red]

A mezzanine floor was/has never been designed to take that kind of weight ...........whatever work is being carried out there obviously someone4 has forgot about a lightweight section of flooring..

[dave351cid]

scheeeses ....what a mess.

there will be a lot of finger pointing and blame shifting going on here . who ever gets the final smack on the wrist will be in big poo poo. my guess is that everyone involved will get spashed.

[schnoods]

Is that Crane A Liebherr?


I have worked with em before, 250tonners as well as 500T, incredible especially the design of the boom (rounded bottom). Wasnt the operators fault or the rigger, the foundation is touch and go to say the least.

Surely if they couldnt reach it from stable ground then a Pin Jib Crane woulda been the go for the reach.

Even a Tower Crane woulda been the go, Money always comes second to safety!!

[XR Martin]

I would even drive a car on that floor, letlone a 250t crane.
Surely the crane operator would have gone hell no when looking at that, despite what some gingerbeer said.

[RIPGMH]

Originally Posted by snappy84

Not the engineers fault yet . I Can't remembr the name of the trade but there is supposed to be a guy that walks around with an xray type machine that looks like a metal detecter that is supposed to look for weaknesses in the slab . If he had been through and found nothing id say the blame falls on him.

I think the only person you can't blame is the crane driver if he was issued with an engineening assessment. The floor may have been quite safe for a 250t crane but the load placed on the flooring at full extension with a load is quite different. There are thousands of factors that play into this and it will take an incident investigation months to determine all the causes.

[XR Martin]

Im also surprised someone was allowed to get so close to it while it was so precariously balanced on one corner. It could have brought the whole floor down with it

[WPN XR6T]

Originally Posted by snappy84

Not the engineers fault yet . I Can't remembr the name of the trade but there is supposed to be a guy that walks around with an xray type machine that looks like a metal detecter that is supposed to look for weaknesses in the slab . If he had been through and found nothing id say the blame falls on him.

That slab does not have the required beams or reo for it to be live loaded in that manner, and it should never have been done so. The Engineer signed off on the slab, so reguardless of the checks done, he/she is at fault.
If there was a site Engineer at hand, the blame falls squarely on them, but all too often civilian site Engineers are mearly on call, and not on site. Just means they get fired over the phone

[WPN XR6T]

Originally Posted by XR6 Martin

Im also surprised someone was allowed to get so close to it while it was so precariously balanced on one corner. It could have brought the whole floor down with it

Probabily not, I think you would find that the slab is keyed and dowed to avoid just that.

[vanman_75]

down a bit ...down a bit ...woah too far .

[rodderz]

The section that fell through does look to be thin from the pics provided, it looks to be inbetween the supports and pylons of the level below

If it's the engineer's fault, I'm surprised- usually they over-engineer everything!

[pottsy44]

Originally Posted by blueoval

As a building designer, I believe that bondek slab is NOT designed for that kind of live load of the crane let alone extra moving weight over the crane arm.

The foreman should have known this.

oh course its not, however, the engineer must of got those temporary orange columns put in place to take the load.

in saying that, the bondek still has no chance.

i'd say he forget to carry the 1 in his calculation

[pottsy44]

Originally Posted by Airmon

Engineers fault assuming the slab was laid correctly?
Not trying to pass blame, but if the engineer was fed the wrong info and the slab wasn't as thick as it was supposed to be.

um no lol. doesnt take a genius to work out how to pour concrete into a hole/area.

the steel reinforcement is the key to the slabs strength and the engineer does (well supposed to anyway) check the steel before the slab is poured.

[rodderz]

There would be a lot of factors into it, the mpa strength, any special additives that may have been specified into the mix, the grade reo etc. Some of these factors may not have been checked at time of installation. I would suggest that the investigation would need to include the testing of all materials and design fundamentals before blame is laid

[Dragoneletra]

dude, the slab is not thick enough and only one layer of reomesh ? No steel bar, nothing.

Screw that.

[ogtrip]

Yea the investigation on this one will be big. To me, it looks like that the orange support beam (jacks) placed under the point load caused by the cranes out riggers has failed (whether they were faulty, cracks etc - test certificate should have came with the jacks saying they were safe to use), maybe not the fault of the engineer approving the slab but the engineer that tested (or didnt test) the jacks and approved them for use. I'm an engineer so its defiantly the crane operators fault....

[FordFan86]

I bet that made a bit of noise...

[S3SR]

Originally Posted by FordFan86

I bet that made a bit of noise...

and left a suprise in the drivers seat

i hope everyone is ok

[MITCHAY]

Epic fail

[Electric XY]

Not real smart a 200 tonne crane on a 150mm bondek slab with barely no back propping, by the way great pictures.

[Walkinshaw]

Its almost impossable to determine the failure mechanisim from the pics above. Could be incorrect propping calculations, installation of propping could be wrong, Crew of crane could have exceeded the limitations imposed by the engineer (as it would look like the outrigger closest to the load was the area of failure, which is quite intresting as Liebherr LTM 1250's with their full counterweights+wing weights(72+97tonne) & luffing fly, even with 8.4tonne at 64meters still has more load through the rear out riggers).

Catasrophict to say the least!!

[Walkinshaw]

not to advocate coverups in anyway shape or form, but if I was involved/associated in anyway with such an incidednt, I can't say I'd be flashing photos & making accusations(even if they are found to be 100% true) on a public forum

[Smoke Pursuit]

How the hell do you recover a crane like that in that situation?

[Jack91]

Originally Posted by LSTerritoryGhia

How the hell do you recover a crane like that in that situation?

Bigger crane.

[4Vman]

Originally Posted by 93_eb_fairmont

Bigger crane.

one piece at a time too...

[schultzie]

similar to what happened to hydralifts brand new 100t down here.. 6months later they have got it back,

did ya have a pannel on the hook?
20t+ pannels Nice... i hate onsite pannels... glad all mine come on out semis...

that wouldnt be a write off... new boom.. and bits..

the last floor slab we worked on was 100m thick and had propping at 500mm to support out 90t with full counterweight.

i must say that even if the engineer said that was ok and not seeing the lack of back propping under the slab i think that i would even say that is not ok. and with full counterweight as well as a rigger i would personally have said no way to doing that...


How much work had you got done there before it happened?

[ZA-289]

Concrete looks way to thin!!!!!!!!

[B-1B]

Originally Posted by schultzie

the last floor slab we worked on was 100m thick

Geez, what was that? 100mm maybe?