Not really a disaster but....

[bridgebuster]

...I've never seen this happen before. I don't know the particulars, a friend sent it to me, but it happened in Brooklyn about a month ago. I assume no one was hurt because it didn't make the news.

 

[itsmoked]

Explain please.

Keith Cress
kcress -

http://www.flaminsystems.com

 

[zeusfaber]

I wonder if the way that rod buckled, forcing the cylinder to support the jib, is a deliberate graceful degradation feature or if they were just astonishingly lucky the whole thing didn't collapse.

A.

 

[TehMightyEngineer]

I'm going to guess luck.

Professional Engineer (ME, NH, MA) Structural Engineer (IL)
American Concrete Industries

https://www.facebook.com/AmericanConcrete/

 

[3DDave]

The relief valves should have relieved before the cylinder rod buckled.

 

[byrdj]

Wonder if it might be a fatigue, where the crane had been operating with a known bowed rod for possible years and it finally gave way.
I thought of this due to when I purchased a used utility tractor decades back, one of the loader bucket cylinders had a slight bow. I proceeded to replace it TILL I got the price for a John Deere part! Thus the bowed rod has been in service ever since.

 

[MacGyverS2000]

Keith,

It wasn't until someone mentioned bowed cylinder that I knew what to look for in the pic...

Dan - Owner

http://www.Hi-TecDesigns.com

 

[itsmoked]

Yeah Dan! I stared at that picture for a good minute and since that cylinder so nicely conformed to the bottom of the boom didn't see it. Of course once you see it it's glaring.

Keith Cress
kcress -

http://www.flaminsystems.com

 

[GregLocock]

Interesting that a ram designer would select that as the first failure mode. I suppose that anything in the cylinder risks 4000 psi oil spray which is a bad look.

Cheers

Greg Locock


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

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

 

[IRstuff]

The company, Cranes Express, appears to be involved in a double fatality in 2016:

https://nypost.com/2016/11/22/workers-killed-after-beam-crashes-on-crane/

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

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