Thread: 250t Liebherr Crane Accident.

Originally Posted by 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.

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.

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..

Originally Posted by isuzurover

outerlimits
Outer Limits 4x4 Board :: View topic - Just saw a mobile crane fall over

Oops!

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

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

Originally Posted by 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..

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.

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.

Originally Posted by 29dinosaur

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

Cheers
Simon

Originally Posted by Blknight.aus

........
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