250t Liebherr Crane Accident.

[gumby190]

Got this in an email from a company I do work for -
I always find this kind of thing interesting.


Incident: Friday Morning 26/09/08 – Castle Hill/Sydney

- 9 Day Old 250t Leibherr Crane (never used before)
- $4mill price tag
- Failure of back propping beneath the 200mm thick concrete deck
- Crane support outrigger punches through slab causing crane to lose balance and collapse across the site and onto adjoining property
- Crane balanced in the air for approx 1 hour before entire rig & boom collapse completely across site and rigs falls through to the basement level.

Amazing that no-one was seriously injured or killed.


http://i448.photobucket.com/albums/qq201/gumby190/Pic7250t.jpg

http://i448.photobucket.com/albums/qq201/gumby190/Pic6250t.jpg

http://i448.photobucket.com/albums/qq201/gumby190/Pic4250t.jpg

http://i448.photobucket.com/albums/qq201/gumby190/Pic2250t.jpg

http://i448.photobucket.com/albums/qq201/gumby190/Pic1250t.jpg

[beforethevision]

I wonder where they will park the second crane when it comes time to lift the first crane out..... :p

[mcrover]

Thats amazing, im surprised that they set up on only 200mm thick concrete.

Years ago I did a little work with a boom concrete pump and they werent allowed to set up on anything that was known to have anything underneith be it a basement, car park or pipe work etc but things have probably changed since then and I dont know if it was law or just a rule they went by.

[djhampson]

That would have been an exciting day at work....imagine calling the boss up and telling them that a brand new crane was about to fall thru the fall :D

[Basil135]

"Err, boss. We have a little problem"
"You didnt scratch the new crane, did you?"

"Well, it might need a bit of a cut & polish"
"What the @#%$ happened?"

"Well, its like this......."

(Insert sound of fainting boss here)

:D

[isuzurover]

There was a big long thread about this on OL a few weeks ago.

Apparently the (brand new) crane has been (or is being) cut up and sold for scrap!!!

Crane specs:
Name:
LTM1250/1

Tonnage:
250

PDF:
1250.pdf

Details:

RATED CAPACITY
250 Tonnes at 3m radius
3.1 Tonnes at 66m radius
72m Main Boom
Hook Height to 104m
All Wheel Steer - 8WD

OUTRIGGER BASE
Full: 8.9m x 8.5m
Half: 8.9 x 5.6m

[Poida4x4]

Holy bat, cowman!

[51jay]

They will need to pull that out.......sounds like a job for a Defender :D

[29dinosaur]

https://www.aulro.com/afvb/images/imported/2008/10/302.jpg
(http://content.screencast.com/users/mittagongvet/folders/Jing/media/c7c39f77-e54c-4593-bf64-b04925e7acb6/2008-10-22_1505.png)

[Shonky]

Holy bat, cowman!

:lol2: What he said! LMAO!

[JDNSW]

There goes our insurance premiums (for everything - they spread it round!)

John

[Tank]

Should have had pigstyed (packing to spread load) sleepers under the outriggers to disperse the load, DLI and Insurance will have a ball with this one, Regards Frank.

[crash]

Ok, I know nothing about operating a crane, what would have happened if the were able to retract the boom enough to swing it around, and extend it the oposite direction to counter balance the crane?
But then again if the crane was going down I would have been out of it and running to safety.

[29dinosaur]

There was a big long thread about this on OL a few weeks ago.

OL - translated means?? Thanks.

[Shonky]

Opposite Lock.

[Ace]

thats -------- ----, i wouldnt want to be the one responsible for that crane, i would be hiding in another country for, say, the rest of my life :D

[isuzurover]

OL - translated means?? Thanks.

outerlimits
Outer Limits 4x4 Board :: View topic - Just saw a mobile crane fall over (http://www.outerlimits4x4.com/phpBB2/ftopic153271.php&highlight=crane)

[George130]

It wasn't me!
Otherwise I would have caught annother rig on my way down.

[cartm58]

on topic of funny thing happened to the crane there was on Youtube sometime ago security footage of crane going over a wharf and then another crane following it into the drink when trying to lift the first crane out. Wonder what they told their boss about losing 2 cranes in one day.

[Bigbjorn]

on topic of funny thing happened to the crane there was on Youtube sometime ago security footage of crane going over a wharf and then another crane following it into the drink when trying to lift the first crane out. Wonder what they told their boss about losing 2 cranes in one day.

They were Irish. Ask Fenian Eel.

[Hymie]

And the caption for any of the pics would be, "Adrenaline is Brown".

[mcrover]

on topic of funny thing happened to the crane there was on Youtube sometime ago security footage of crane going over a wharf and then another crane following it into the drink when trying to lift the first crane out. Wonder what they told their boss about losing 2 cranes in one day.

I was down on the san remo warf one day, just over the bridge from Philip Island and they were using a Chamberlin Tractor with a Jib to lift an engine out of one of the boats.

They had the engine nearly all the way to the jig when the warf let go and the tractor was down to the axle........with the engine block just missed going back through the bottom of the boat.

They got a bigger crane in to lift the tractor out but it didnt go anywhere near the warf.

The engine looked huge being lifted on the jib but really insignificant when it was lifted out by the crane.

[Blknight.aus]

for a point of interest... as a crane operator and dogger...

using the math for the outrigger pad size (and this assumes that your not working directly over or slewing the boom over a sinlge outrigger while at max load if you are increase outrigger pad size by 50%)

using the specs from the internet for that crane AND assuming that they are only lifting 5t of weight at say 70% of max radius (well within the ability of the crane itself)

also assuming that the weight of the crane is within the area loadability of the slabs its supposed to be sitting on using base spec for a medium rebar-ed 200m thick slab...

each outrigger should have been sitting on top of a minimum 2.5 square meter pad for load spreading.

I suspect that (based on the first pic) as they didnt have the spreader pads out that they exceeded the point loading of the slabs which then let go and thats all she wrote.....

Ive been caught out in a similar situation where dry surface soil picked up water from underneath and did the liquifaction thing. lets just say that on that day that between following all the rules and some luck the crane stayed boom up and wheels down..

[Shonky]

outerlimits
Outer Limits 4x4 Board :: View topic - Just saw a mobile crane fall over (http://www.outerlimits4x4.com/phpBB2/ftopic153271.php&highlight=crane)

Oops! :eek:

My bad - I'm evidently not on enough forums!

[LandyAndy]

CraigE sent me that the other week,IMPRESSIVE STUFF UP.
Craig also sent another,it was a semi trailer having a rest(laying on its side) a similar crane was used to put the truck on its wheels,problem was the brakes on the semi were off,it rolled off down the road tumbling the crane over as it ran away CLASSIC!!!!
Andrew

[Tank]

for a point of interest... as a crane operator and dogger...

using the math for the outrigger pad size (and this assumes that your not working directly over or slewing the boom over a sinlge outrigger while at max load if you are increase outrigger pad size by 50%)

using the specs from the internet for that crane AND assuming that they are only lifting 5t of weight at say 70% of max radius (well within the ability of the crane itself)

also assuming that the weight of the crane is within the area loadability of the slabs its supposed to be sitting on using base spec for a medium rebar-ed 200m thick slab...

each outrigger should have been sitting on top of a minimum 2.5 square meter pad for load spreading.

I suspect that (based on the first pic) as they didnt have the spreader pads out that they exceeded the point loading of the slabs which then let go and thats all she wrote.....

Ive been caught out in a similar situation where dry surface soil picked up water from underneath and did the liquifaction thing. lets just say that on that day that between following all the rules and some luck the crane stayed boom up and wheels down..
If they had of used packing, railway sleepers criss-crossed (pigstyed) they would have had a base of 2.5Mx2.5M they would have had a 6.25M square base for each of the 4 outriggers to sit on.
When i worked a Cockatoo Island shipyard in Sydney, any Mobile crane not on rails lifting on the Wharf area surface had to have pigsty packing for the outriggers, it all comes down to commonsense, the crane driver/rigger/dogman are responsible for setting the crane up safely, which they obviously didn't do, hate to be in their shoes, Regards Frank.

[Blknight.aus]

see what happens when you miss an S.....

2.5meters....

as in about 1.5x1.5m per pad....

and I think I may have screwed the pooch on that too. The lookup chart Ive got only specifies slab thickness and reinforcments not if its a suspended slab or not.

IF the sydney warf rules are the same as the last time I was down there the pads are not only for load spread but for anti slip, (thats part of why they are wooden) I got caught out dogging for someone driving a 50 tonner and used the crane on rubber to put down the steel outrigger pads and promptly got a notice for not following local guidelines. a 13mm sheet of ply later and we were in business.

I thought railway sleepers were 1.8m long.... bloody heavy buggers to work when you have to stye up an outrigger 60 inches.

[abaddonxi]

https://www.aulro.com/afvb/images/imported/2008/10/302.jpg
(http://content.screencast.com/users/mittagongvet/folders/Jing/media/c7c39f77-e54c-4593-bf64-b04925e7acb6/2008-10-22_1505.png)

Dunno, they look fine, it's the crane and the floor that bent.:D

Cheers
Simon

[JDNSW]

........
I thought railway sleepers were 1.8m long.... bloody heavy buggers to work when you have to stye up an outrigger 60 inches.

It may depend on the rail gauge - i.e. Qld, NSW or Vic! (3'6", 4'8.5", 5'3")

John

[29dinosaur]

Dunno, they look fine, it's the crane and the floor that bent.:D

Cheers
Simon

Sure - that's really what I meant to say ... the floor was probably not even 'ready' to take the weight of the outrigger ... shown by fact that the floor was still being propped...

[Quiggers]

1). 9 days old eh? must've been something wrong with it:D
2). Who needs yet another shopping mall?:mad:
3). What's the cure time for concrete?:eek:
4). Will this floor take the weight of 'mum's taxis' when it's complete?:wasntme:

Question/note for blknight: One could assume it was lifting the prefab concrete walls into place? May give an indication of weight being lifted....

Q

[29dinosaur]

1).
2). Who needs yet another shopping mall?:mad:


Exactly my thoughts... we had one of these shopping mall monstrosities recently constructed about a km or so from our typical small country town heart and it has:
1) made it very hard for small businesses to survive - thanks to Big W and Woolworths
2) attracted every yobbo within 100km
3) because the banks went to this business - all the local aged people now have to travel to the centre rather than walk into town
4) ruined real estate values for the rest of us in town


Only wish someone stuffed upp in the construction of this centre...

[Tank]

see what happens when you miss an S.....

2.5meters....

as in about 1.5x1.5m per pad....

and I think I may have screwed the pooch on that too. The lookup chart Ive got only specifies slab thickness and reinforcments not if its a suspended slab or not.

IF the sydney warf rules are the same as the last time I was down there the pads are not only for load spread but for anti slip, (thats part of why they are wooden) I got caught out dogging for someone driving a 50 tonner and used the crane on rubber to put down the steel outrigger pads and promptly got a notice for not following local guidelines. a 13mm sheet of ply later and we were in business.

I thought railway sleepers were 1.8m long.... bloody heavy buggers to work when you have to stye up an outrigger 60 inches.
Just using railway sleepers as an example, the timbers we used to use were seasoned hardwood (cut from old bridge beams) 2.5Mx300mmx150mm, bloody heavy and splintery, Regards Frank.

[harry]

police and the employer are looking for the driver of a crane which fell through a building site recently, his family are also worried for his safety.

i'll kill the bastard if i catch him said the crane owner



meanwhile in a town far from sydney,






arr, gidday, i'm looking for a job as a crane driver, been workin those big rigs in sydny an the last fella broke is crane, '
anythin going round ere eh?

[Blknight.aus]

1). 9 days old eh? must've been something wrong with it:D
2). Who needs yet another shopping mall?:mad:
3). What's the cure time for concrete?:eek:
4). Will this floor take the weight of 'mum's taxis' when it's complete?:wasntme:

Question/note for blknight: One could assume it was lifting the prefab concrete walls into place? May give an indication of weight being lifted....

Q

thats where I pulled 5t from... thats about what one of the narrow sections that the crane missed falling on in the first picture would weigh without a door way in it and what they were lifting wasnt a guess as the lifting gear laid out in the 3rd and 4th photo is pretty much exactly what you need to use to stand and lift those panels into place. my wildcard guess is that after the operator set up the boom he flung it out over the pickup point and the setdown points to make sure that the onboard computer gave him the numbers he needed to do the lift and as he passed it over and outrigger he went over the point loading limit of the slab or the supports and that was it... There still exists the posibility that the slab had the shoring member placed under the outriggers to push the load down to the main foundation , its a cheap but risky way of temporarily upping the point loading and max load of a given chunk of slab so that you can try on something like what they've done there. but if you get a shoring member in the wrong place in relation to the outrigger pad....... welll.... the pics speak for themselves...

I must stress that the 5t was a conservative estimate used it illuminates that even in a best case scenario (and assuming I didnt screw the math) they still had it wrong, very wrong. If they were lifting the big heavy main load bearing wall type panels they can go up past 60t in some instances and the last big one of those I saw going up had 3 cranes involved in the lift 2 big boys to lift it and one little one to drag the lifting gear into place