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St. Petersburg (FL) Crane Collapse

St. Petersburg (FL) Crane Collapse

RE: St. Petersburg (FL) Crane Collapse

The guy in the orange safety shirt (running to the lower-right of the scene) definitely has soiled britches. He misses getting hit by the lifted load, then just misses getting hit by the headache-ball, and then narrowly misses getting ht by the jib. Off to Vegas for him!

RE: St. Petersburg (FL) Crane Collapse

Jeez. I was going to ask my partner about it, but this is a different St. Petersburg. So confusing, heh.

RE: St. Petersburg (FL) Crane Collapse

So the load was too heavy and/or the lift angle too flat I presume.

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RE: St. Petersburg (FL) Crane Collapse

(OP)
BP: I try to always remember eng-tips is international, and I wouldn't want to get in bad graces with Mr. Putin by insinuating this happened in Leningrad. Those folks don't fair so well.

RE: St. Petersburg (FL) Crane Collapse

Yeah... I typically stay out of the forensic "CSI" that others enjoy so much (see FIU)... but this looks a lot like the crane was booming down and got outside the chart radius.

Less obvious causes could be an improperly prepared working surface or improper assembly of the crane.

----
The name is a long story -- just call me Lo.

RE: St. Petersburg (FL) Crane Collapse

All I can say is, what load?

I see something hanging from the main boom, but not the extension.

I also see no outriggers on the crane.

Mike McCann, PE, SE (WA)


RE: St. Petersburg (FL) Crane Collapse

Must be a 4x4x8 foot block of gold...

Mike McCann, PE, SE (WA)


RE: St. Petersburg (FL) Crane Collapse

Mike - it was a crawler crane.

RE: St. Petersburg (FL) Crane Collapse

The first guys next to the crane start running before anyone else. They either heard the warning hooters or a yell from the operator.

Does look like the jib lowers a lot more than the crane moves to start with so maybe a failed brake or control gear but then the wire can't keep pace with the jib fall and over it goes.

Looks more like it was set up to lift stuff for the units which are at foundation level and used out of reach.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

RE: St. Petersburg (FL) Crane Collapse

Looks to me like nothing happened other than overturning the crane- no brake failure, no jib failure. And in that case, just a matter of getting the load too far out. Possibly coupled with wind.

RE: St. Petersburg (FL) Crane Collapse

A few more piccies here - http://www.tampabay.com/news/publicsafety/accident...

It was a scissor lift.

Doesn't look like a lot of counter weight on the crane though and he was lifting 90 degrees to the tracks.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

RE: St. Petersburg (FL) Crane Collapse

Why does no one ever take good photos? LI... just missed you... and, some photos, but not the ones that I would have taken.

Dik

RE: St. Petersburg (FL) Crane Collapse

...the pics aren't bad. One shows the lift number which after quick google search, returned 4635 LBS weight so quite a bit more than 1000 lbs quoted in the article.

RE: St. Petersburg (FL) Crane Collapse

Maybe 1000 lbs is what they said to the crane operator....

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

RE: St. Petersburg (FL) Crane Collapse

It seems to pivot over the front right corner. Other videos of those collapsing like the NYC crane show it pivoting straight over the nose. Were the tracks turned in the wrong direction or did the ground give at the right front? Maybe wind did upset it blowing the boom off to the right.

The guy that almost got hit 3 times didn't quite have that run perpendicular to the falling boom thing figured out.

RE: St. Petersburg (FL) Crane Collapse

I can't see a model number on the crane, but the charts are available. https://www.terex.com/cranes/en/products/latticebo...

Maybe this one? https://www.terex.com/cranes/en/cs/groups/webconte...

Then of course we need the boom and jib length, and a guess at angles.

Just by eye based on the white trailer in the foreground that looks like a standard 51 footer, I guess 160 foot boom and 50 or 60 foot jib.

Maybe was within limits. But there was a pretty stiff wind - look at the flag on top of the police building.

RE: St. Petersburg (FL) Crane Collapse

http://www.wtsp.com/article/news/local/operator-er...

“We’re very fortunate the incident that happened yesterday didn’t affect the building, won’t affect the schedule, and most importantly no one was injured,” Byrne said. “It was just an unfortunate event that happened and the operator made an error lifting a piece of equipment. He got outside the safe zone of the equipment so this is a good opportunity to remind everyone to be diligent about every task they do so that something like this doesn’t happen again.”

RE: St. Petersburg (FL) Crane Collapse

It highlights one of the greatest problems for full automation of such things - Take the example where a person is able to detect the change in pressure under their feet to realize they will soon topple over, but that requires tens of thousands of nerves to coordinate the whole picture. Even on simpler vehicles it seems like it's rare to non-existent to include a couple of strain gages and microprocessors to perform a similar task. In the case of a crawler like this it would be enormously expensive to make a similar measurement for ground pressure and to predict the rate of transfer one needs to integrate angle, extension, possibly wind speed, and load feedback as well. My amazement at what robotics accomplishes is because even complicated robots have fewer sensors that the smallest insects and are slightly better than the simplest worms.

RE: St. Petersburg (FL) Crane Collapse

I thought most construction cranes these days had such instruments to tell the operator if limits were being approached? I guess I'm thinking tower cranes, where I have knowledge from a colleague whose son trained to operate them. Guess a crawler crane might have more instrument requirements (angle of boom, rotation of deck, in addition to load sensing). Our shop electric forklift has sensors and relief valves that prevent lifting a load when the forks are not centered/are overtilted, or load is overweight.

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