Crane Tips Over

Lumberjack said:
Depending on the crane, lifting the opposing outrigger a short distance may be completely normal, especially on knuckle booms. Lifting the front end that much and the passenger main outrigger being ~4' off the ground (also lost its pad) is way beyond "normal."

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Thats one hellova preload ;)

Nothing in the photo looks outrageous so musta been the pick weight was grossly mis caculated
 
Reach said:
I’ve seen one outrigger lift an inch or two on certain cranes during a heavy lift, but never more than that. Lifting the front end that much is definitely unacceptable.

As for loaders, I have no problem driving around with the rear tires off the ground on a skid steer. I’ve got a few thousand hours in them, and as long as it’s a machine I know well, and know it’s limits, I don’t mind pushing them. Lifting a lot a foot or two that way is very different too, if the loader tips, it’s not going far and you can just boom down and set the log back on the ground. I won’t lift anything very high that way.
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I took part in breaking a decently sized grove, I don't know the tonnage but it was the biggest crane on the island, 1/3.. The load 'shifted' and the crane crab walked/and fishing poled half its width, cracked welds on one boom section and bent two others (not buckled).
We were setting up climbing poles for a logshow, and the operator dictated which chokers were to be used and how to sling them... The bark slipped off the log from a static pick off the ground, but the logs were taller than the boom and way too heavy. The plan was to not even lift them off the ground, but get them up to about 70 degrees and the excavators wiggle the butts into the holes... I was treated as just a helping hand, and simply slung one of the two slings as no one listened to me. No one was hurt but the crane operator's retirement plan... (pulled all of his retirement and bought a pair of cranes, broke both in the first 5-6 years)..
 
evo said:
I took part in breaking a decently sized grove, I don't know the tonnage but it was the biggest crane on the island, 1/3.. The load 'shifted' and the crane crab walked/and fishing poled half its width, cracked welds on one boom section and bent two others (not buckled).
We were setting up climbing poles for a logshow, and the operator dictated which chokers were to be used and how to sling them... The bark slipped off the log from a static pick off the ground, but the logs were taller than the boom and way too heavy. The plan was to not even lift them off the ground, but get them up to about 70 degrees and the excavators wiggle the butts into the holes... I was treated as just a helping hand, and simply slung one of the two slings as no one listened to me. No one was hurt but the crane operator's retirement plan... (pulled all of his retirement and bought a pair of cranes, broke both in the first 5-6 years)..
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Wow, that’s a seriously expensive day! Glad no one was hurt there!

It seems like the operator might have been well served with a bit more experience before he went out on his own…
 
That right there is a dinky crane. Should be kept for putting up trusses, not in treework. Lordy. I have used some big knucklebooms over the years. No way would I mess with a little thing like that from that distance trying for tonnage. Recipe for disater. Glad no one was hurt. Great for a learning vid though.
 
Reach said:
I have removed many trees with a crane, I don’t know how many, because I’ve never counted, but it’s a lot. I have never used a crane that small though, not sure how big it is exactly without being able to read the numbers, but by the design it is no bigger than an 18 ton.

At that radius, it would not have much real capacity, so I am rather confident they were severely overloaded. If I were to take a guess as to what their capacity was at that distance, on a crane that small, I would guess it was only in the hundreds of pounds. Certainly not even 1000 pounds, and that piece looked like it weighed a couple thousand from the picture.
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There's footage elsewhere. That tree easily weighed 6000 lb, and likely much more. The truck mount crane could be a 23 ton, maybe even 28. But its load chart would have been under 1500 at that radius, I'm sure.

It's a wonder that company was still in business, after seeing that incredibly dumb move. The tree could have been easily pieced out. might even have been room to fell it sideways across the back yard.
 
islandarb said:
That right there is a dinky crane. Should be kept for putting up trusses, not in treework. Lordy. I have used some big knucklebooms over the years. No way would I mess with a little thing like that from that distance trying for tonnage. Recipe for disater. Glad no one was hurt. Great for a learning vid though.
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I've done scads of work over the years with a local crane guy who has a 23 ton crane, with 92 feet of main boom. We've worked at a 50 foot radius, carefully. Taken 10,000 lb picks, close in.
 
Roger_Barnett said:
There's footage elsewhere. That tree easily weighed 6000 lb, and likely much more. The truck mount crane could be a 23 ton, maybe even 28. But its load chart would have been under 1500 at that radius, I'm sure.

It's a wonder that company was still in business, after seeing that incredibly dumb move. The tree could have been easily pieced out. might even have been room to fell it sideways across the back yard.
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I agree completely. If you look further down at my next post, you’ll find it pretty well summarizes what you have just said there.
 
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Is it my imagination? Don't other industries require tag lines. Almost seems like a good idea.


A simple trunk wrap or two would have held the butt of the limb at the trunk.



Guess it pays to go big!
 
27RMT0N said:
And the latest crane tipping over video, this time with the worst music and camera person possible:

https://www.reddit.com/r/arborists/comments/v1zds9
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Vicente said:
Well they didn't hit the clients house so that's a plus. With that big pole there they could've easily set up a grcs or hobbs to assist that crane and act as a back up.
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Watching that, obviously they could have gone smaller but I think that sized piece was possible if they lifted the limb as they cut (cut from the underside) then the load would have been closer to the crane as it came off the trunk.
 
I wondered similarly.

I'd like input from experienced craners about standing up a limb, directional hinge or straight kerf from the bottom? Boom up? Cable up? Both?
 
southsoundtree said:
I wondered similarly.

I'd like input from experienced craners about standing up a limb, directional hinge or straight kerf from the bottom? Boom up? Cable up? Both?
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That pick was seriously overboomed, it should not have swung away from the crane like it did. That almost certainly caused the crane to tip.

When standing up a limb, I like a nice shelf, with a long shelf to allow the piece to sit for a while before it lifts off. Alternately, a hinge works, but it has to break at the right time and the wood doesn’t always cooperate. It can get exciting if it breaks early.

As for the crane motions necessary to stand the limb up, that depends on the orientation of the crane to the pick. Sometimes it’s mostly booming up, sometimes it can be boom down while cabling up. There can be some swinging too, all depends on the pick.
 
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