Crane slings

I use a varity of round slings.(Countinous loops) When girth hitched they have a WLL of 4,200LBS. On big wood We use steel chockers 9/16" WLL (chocked)6,000lbs? and flat eye to eye slings WLL 4,500lbs-6,000lbs. The round slings get used the most.
 
i use the yellow tenex slings. they are rated at about #7500. i carry 4 or 6 of different lengths. the crane company rarely has them. for big wood i jump up to the fat blue ones god only knows what they are rated for. i really really hate using cables.
 
Here's something else along the same line.

Has anyone used a lag to carry large diameter trunk sections?

What I mean is, when you are in the final trunk and you want to carry sections of this trunk away with the crane. Using a lag in the center helps you remove the sections without any tipping, they carry perfectly verticle.

Because when you carry a log (that is big diameter), if you use one sling, it will make the log tip on an angle, if you use one on each side, it sometimes works okay, but you still usually get the log to tip a bit to the side because one strap will be a little shorter because of their placement.

Now, this using a J-lag sounded terrible to me at first, but here's what someone told me they did with a large oak trunk. They took a large J lag, did not drill a hole, but pounded it with a maul to get it started, then screwed it in. They then wanted to test how much it would hold before they made any cuts, so they increased the crane pull till something failed. The lag never pulled out, but then the J shape uncurled till it came undone. I forget the actual figure in pounds, but it was way more than they would ever attempt to carry, so it satisfied them. They then put another lag in and took away the trunk in sections in that manner. They said it worked great.

Closed eyes would be safer I'm sure.
 
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They then wanted to test how much it would hold before they made any cuts, so they increased the crane pull till something failed.


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That dont sound too safe IMO....
so they increased the pull until the crane tipped over /forum/images/graemlins/crazy.gif


I also agree way to time consuming
 
We have a 30 ton crane and our chip trucks typically carry four sling sizes, all Tuflex round slings (ratings are the manufacturer's WLL based on a 5:1 safety factor):

A six foot sling rated at 2600 pounds vertical, 2100 pounds choker;
An eight foot sling rated at 5300 pounds vertical, 4200 pounds choker;
A ten foot sling rated at 8,400 pounds vertical, 6700 pounds choker;
and two twenty foot slings rated at 16,000 pounds vertical, 13,400 pounds choker.

The eight and ten footers see the most use when we are dismantling the crown. The twenty footers are used mainly for the wood. We also carry some shackles for various balancing setups. The crane does have some steel chokers, but they are difficult to use for treework and are kept for when the crane is doing other types of work that could damage the Tuflex slings.

What's your preference Mark?


I have used lags in a slightly different manner than what was described above. The tree was a four+ foot elm that grew right up through a large, prized english yew. The client did not want any damage to the yew and the only crane that we could get close was a small, all-terrain crane. The pieces couldn't be cut tall enough to ensure that a sling wouldn't slip or the piece wouldn't tip. I don't remember any of the specific numbers, but I did estimate the weight of the wood using a green log weight chart and used lags that could safely handle that weight. To keep the piece from tipping, three lags were set in the top of the piece (using a pilot hole for each lag) and attached to a three-legged, steel balancer provided by the crane company. It was time consuming, but for that situation the lags worked well.


Mahk
 
I had a similar situation one time and i drove huge nails (2) to make sure the choker did not slide off.
i meant to say tuflex not tenex.
 
I got ya. That would be a good way to fix that problem. I just wouldn't trust them enough to use over top of anyone or anything unless I seriously over-compensated for the weight. Maybe I'd use the lags for a redirect to keep from tipping and secure the slings to the load as well? Never tried it but hmmm?
 
I would say that would be for lighter loads,maybe 3 to4000 lbs. I don't think I would use it on anything much heavier. I would much rather dump the log than pick it. It is better to pick small pieces off the ground.
 
I've been experimenting with hanging a big block from the hook passing a big rope through it having splices on each end. Then attaching the 2 slings to it so when lifting wood the rig self equilizes. So far works great. Sone I will get the proper componets once the wrecking crew gets used to using it.
 
That sounds pretty good Tod. How does that work with the cut. Can you still come in from one side or keep hitting both sides as it equalizes? There's still times when I do want that piece to open up while cutting. Just to help the saw get through. Then maybe a little tap on the backside.
I do like tuflex with screwpins on them. I Always use shackles.

While we are on tuflex, has anyone tried or needed to use spider set-up on slings? Would it hold?

What are you using through the block?

Later
 
Right now it is a piece of 7/8" double braid. going into a 3/4" cmi block. I will clean it up once we have all of the lengths, sizes etc. figured out. As far as the cuts go we use a step cut just about every time.
 
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