Crane Cribbing

I have to do a lot of winter work, on slopes..... so I made up some plate and angle iron pads that I can orient for best slip prevention. I put the outriggers out in the usual fashion, and then place these right before contact so they are right where I want them. They have worked great, they really bite and only cost 10 bucks or so each to make. I do modify my work when using them however, a bit more conservative, go slow etc. The standard outrigger bottoms are smooth steel with turned up sides, kinda like a snowboard.... so yeah winter work requires a different approach. I often snowboard and do crane work on the same day, but do NOT want to combine the two!
 
Wow that's impressive cribbing! Do You go lower capacity when "jacked up " like that? Either one of my knucklebooms could've set up there with no problem or cribbing needed! Kbooms have flip up stabilizer legs that you can have up on top of retaining walls etc. Not to mention the way Kbooms can work safely much farther from level. Not braggin here just saying because so many people ask why I use Kbooms.
 
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Wow that's impressive cribbing! Do You go lower capacity when "jacked up " like that? Either one of my knucklebooms could've set up there with no problem or cribbing needed! Kbooms have flip up stabilizer legs that you can have up on top of retaining walls etc. Not to mention the way Kbooms can work safely much farther from level. Not braggin here just saying because so many people ask why I use Kbooms.

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whats a "flip up stabilizer" how does it get over a wall? I really am looking foward to seeing these "kbooms" work, i am haveing a really hard time understanding how you can run something with that much boom that far out of level.
I run the crane in its chart regardless of how its set up, the only thing i will limit is any "dragging" which i would never do anyways because the chart is only for a freely suspended load directly under the booom tip, and tree guys have never been know to drag something thats out of reach. in those pictures we took picks all around the crane as if it was set up in a parking lot, if you set up the crane right it doesnt matter.
 
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in the picture of the white sterling all jacked up it is so high because the driveway is very steep and there is a 3 foot high wall in the back the riggers need to clear

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Quick question on the picture of the cribbing on top of the retaining wall. Obviously you gave it a lot of thought and it worked out for you, but I was just wondering how you guys decided that the ret. wall could sustain the extra load bearing pressure to the ground from the crane work?

Did you guys know how deep the existing wall footings were, what size and type of construction the wall was made up of, or what the soil conditions behind the wall were? These are all questions that would be going on in my mind as I was debating on how safe it was to setup this way.

Just curious. Thanks for taking the time and posting the pictures. This is a great discussion.
 
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in the picture of the white sterling all jacked up it is so high because the driveway is very steep and there is a 3 foot high wall in the back the riggers need to clear

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Quick question on the picture of the cribbing on top of the retaining wall. Obviously you gave it a lot of thought and it worked out for you, but I was just wondering how you guys decided that the ret. wall could sustain the extra load bearing pressure to the ground from the crane work?

Did you guys know how deep the existing wall footings were, what size and type of construction the wall was made up of, or what the soil conditions behind the wall were? These are all questions that would be going on in my mind as I was debating on how safe it was to setup this way.

Just curious. Thanks for taking the time and posting the pictures. This is a great discussion.

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no we didnt have all that info. the entire yard was full of ledge, a couple inchs of soil then solid rock. I wasnt really concerned about the walls for several reasons, they looked like they were built well, the ground was very stable around the walls and the crane was on the low side of the wall reaching up. I would have giving the walls a much closer look if the crane had been on the hill reaching down over the wall. not sure if that answered your question, i guess it was a judgement call based on experince.
 
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hemlock works great for us .Elm would be to heavy. to lift all day long thats for sure.

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Thanks for the info Rob and welcome to Tree Buzz.

It will be nice to have another crane operator's point of view here as well.
 
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Oh great... did the picture of the demo in chelmsford get u to join the site?

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I didn't see that pic, is it on the Buzz somewhere??

Mighty nice avatar, GMK3055
 
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