Rigging Failure - Hong Kong 16

[azcats]

Dropped a large excavator down a shaft.

Couple videos towards the end.

[URL unfurl="true"]https://vertikal.net/en/news/story/36364/crane-drops-load[/url]

 

[JohnRBaker]

How far did it drop? You'd think that would be the sort of info that would have been reported.

John R. Baker, P.E. (ret)
EX-Product 'Evangelist'
Irvine, CA
Siemens PLM:
UG/NX Museum:

The secret of life is not finding someone to live with
It's finding someone you can't live without

 

[SuperSalad]

With those chains and straps whipping around, I'm shocked to see the one person who barely stepped back and then immediately went to look over the edge while they were still swinging so much.

Andrew H.

http://www.MotoTribology.com

 

[JohnRBaker]

He was just checking to see if it stopped when it hit the bottom ;-)

John R. Baker, P.E. (ret)
EX-Product 'Evangelist'
Irvine, CA
Siemens PLM:
UG/NX Museum:

The secret of life is not finding someone to live with
It's finding someone you can't live without

 

[EdStainless]

Where was the CG of this thing? They asked too late.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed

 

[JStephen]

Check timing between fall and impact, that should give you the approximate distance.

 

[1503-44]

What did they use for bait?

Reality used to affect the way we thought. Now we somehow believe that what we think affects reality.

 

[JohnRBaker]

Check timing between fall and impact, that should give you the approximate distance.

Yea, I thought of that after I posted my comment. So I watched the video a couple of more times and timed the drop and it lasted about four seconds, which would put the fall at about 256 feet or about 78 meters.

John R. Baker, P.E. (ret)
EX-Product 'Evangelist'
Irvine, CA
Siemens PLM:
UG/NX Museum:

The secret of life is not finding someone to live with
It's finding someone you can't live without

 

[itsmoked]

Twenty five stories... That'll spill your drink.

Keith Cress
kcress -

http://www.flaminsystems.com

 

[waross]

We are trained professionals.
Don't try this at home!

Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[MJCronin]

This is a rookie mistake !!!

Rigging with the lifting points BELOW the CG is asking for trouble !!!

There are complete Rigging seminars devoted to this specific topic !!!

https://www.youtube.com/watch?v=vjlLB23CrqA

https://www.slideshare.net/scranet2/2015-crw-uncovering-the-root-and-causes-of-crane-accidents

MJCronin
Sr. Process Engineer

 

[LionelHutz]

There's typically heavy duty attachment points in between the tracks on big excavators. That's where they were lifting that one. On any I've been around I can't recall ever seeing lifting points around the top to attach to. On that excavator, is there lifting points around the top above the center of gravity? Can't blame them for connecting too low if that was the only place to connect.

 

[byrdj]

the moment arm of the bucket, little weight at a distance over coming lot of weight.

should have notice the uneven initial lift off level deck had more load on front points. then put bucket in the center of the points.
but interuping weight distrubution is an art. guess that is why load indicating clevis were coming into use when I left

Chains were taboo for my years in the field. In the case where chains were abolutely required, they were inspected and proofed more stringent than cables and slings

 

[GregLocock]

Is the cab/jib assembly actually fastened down through the bearing that allows it to rotate? I know that battleship gun turrets, and those on tanks, aren't actually connected. That is, if you tip either upside down the turret falls off.

Cheers

Greg Locock


New here? Try reading these, they might help FAQ731-376

http://eng-tips.com/market.cfm?

 

[byrdj]

looks like it stayed on

 

[dik]

About 10 years back one of my projects was to lower a large 'Telehandler' down a mine shaft... It had threaded connections as part of the actual equipment for this purpose... when I looked into it, it was common for heavy equipment to have threaded 'sockets' for attachment for hoisting.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?
-Dik

 

[Sparweb]

That guy in green has seen this happen before. You can tell by the way he walks up to the railing, looks down, and casually walks away that he's not alarmed. It's just another day at the office.
Given the orientation of his arms, he was probably recording it on his phone (which he stows before walking up to the fence). I bet his friends have an even cooler video that this one to watch.

http://www.sparweb.ca

 

[Sparweb]

MJCronin,
FYI people in Hong Kong are blocked from watching Youtube videos. In fact, much of the outside world is blocked, and it's getting worse.

http://www.sparweb.ca

 

[waross]

Excavators and cranes are not free to "Fall" off the undercarriage.
There are a number of normal operating modes that would remove the top from the bottom if it was possible.


Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[IRstuff]

Looks like pretty standard rigging approach for that sort of machine; the only thing that looks different is the bucket seems to be too far forward, compared to a successful lift

https://www.youtube.com/watch?v=XjN7YtoEa74

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert!

https://www.youtube.com/watch?v=BKorP55Aqvg

faq731-376 forum1529 Entire Forum list

http://www.eng-tips.com/forumlist.cfm