Crane collapse in NYC
Crane collapse in NYC
(OP)
http://gawker.com/a-huge-crane-just-fell-down-in-lower-manhattan-1757291101
At least one fatality so far, definitely going to be a high profile case.
At least one fatality so far, definitely going to be a high profile case.
Professional and Structural Engineer (ME, NH)
American Concrete Industries
www.americanconcrete.com





RE: Crane collapse in NYC
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RE: Crane collapse in NYC
Professional and Structural Engineer (ME, NH)
American Concrete Industries
www.americanconcrete.com
RE: Crane collapse in NYC
www.SlideRuleEra.net
www.VacuumTubeEra.net
RE: Crane collapse in NYC
The subject crane is a crawler crane - there are no outriggers.
RE: Crane collapse in NYC
http://www.nytimes.com/2016/02/06/nyregion/crane-c...
Gothamist appears to be actively updating as information comes in:
http://gothamist.com/2016/02/05/crane_collapse_tri...
RE: Crane collapse in NYC
As it was snowing, I wonder if icing could have been a factor, increasing the wind force and overturning ice load?...
This could have been a lot worse...
Mike McCann, PE, SE (WA)
RE: Crane collapse in NYC
Very likely. Lattice boom members have a lot of surface where ice can accumulate. Puts the ice's weight in the worst place for overturning.
www.SlideRuleEra.net
www.VacuumTubeEra.net
RE: Crane collapse in NYC
With the wind at a certain nominal speed, it could be channeled down through the buildings at a higher speed.
RE: Crane collapse in NYC
RE: Crane collapse in NYC
I believe the crane is a Liebherr LR 1300...
News reports state the crane is rated 330 tons, the boom length in use is 565 ft. Those numbers are an exact match for the Liebherr LR 1300.
The company that owns the crane, Bay Crane, has at least four of this model: Link
The photo above is a "spitting image" of this model:
Based on the specs for the Liebherr LR1300 (see link below), handling 565 ft. of boom, the absolute maximum allowed, would be a real challenge even under ideal condition, which was not the case this morning.
Liebherr LR1300 Specifications
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RE: Crane collapse in NYC
RE: Crane collapse in NYC
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RE: Crane collapse in NYC
I'm amazed the driver wasn't squished.
Keith Cress
kcress - http://www.flaminsystems.com
RE: Crane collapse in NYC
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Crane collapse in NYC
RE: Crane collapse in NYC
Keith Cress
kcress - http://www.flaminsystems.com
RE: Crane collapse in NYC
RE: Crane collapse in NYC
RE: Crane collapse in NYC
RE: Crane collapse in NYC
RE: Crane collapse in NYC
Keith Cress
kcress - http://www.flaminsystems.com
RE: Crane collapse in NYC
I'm thinking that the jib should have been luffed or lowered first. There appears to be a large wheel or wheels at the end of the jib.
These are common on large cranes of this type.
As these cranes are errected, the main boom is lifted first and the end of the jib is allowed to roll along the ground. When the main boom is near vertical, the jib may then be safely raised.
I susspect that they did not intend to lower the crane all the way to the ground.
They may have been intending to only lower it enough that there was no danger of the wind blowing it over backwards, as in Mecca.
That would explain lowering it with the jib in the working position.
A combination of ice build-up, the extended jib and gusting wind may have moved the center of gravity out past the end of the tracks.
Once the crane starts to fall, the radius of the boom CG increases and continues to increase and the radius of the CG of the crawler part complete with counter weights decreases and continues to decrease. From that point, there is no going back.
Bill
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RE: Crane collapse in NYC
RE: Crane collapse in NYC
Keith Cress
kcress - http://www.flaminsystems.com