Cabling

klimbinfool · Dec 8, 2004

here is a premium cable job. I took this picture the other day while roaming the city ...

Greg

klimbinfool · Dec 8, 2004

another shot

tod_k · Dec 8, 2004

Nice.

Zac · Dec 9, 2004

Tree bondage eh?

Norm_Hall · Dec 9, 2004

The ANSI A300(Part3)-2000 has a guideline in it.
All steel hardware has to be rust resistant. We use galvanized steel.
3/8" lags can be used up to 5" limb diameter. (At install point)
1/2" lags can be used up to 8" limb diameter. (At install point)
5/8" lags can be used up to 10" limb diameter. (At install point)
> 10" to 18" a 3/8" rod is used. (Eye bolt or rod with amon eye)
> 18" to 24" a 1/2" rod is used.
> 24" to 28" a 5/8" rod is used.
> 28" the Standard says N/A for eye bolt and 7/8" for amon eye.

I also have a spreadsheet on J-lag pulling tests. I will have to dig it up. Different diameter J-lags were tested to the point of failure in Poplar, silver Maple and Oak(I don't remember the species). Some lags pulled out and some straightened.
If people are interested, I'll post it when I find it.

We are still waiting for some data on synthetic systems.

Mahk_Adams · Dec 10, 2004

[ QUOTE ]

I also have a spreadsheet on J-lag pulling tests....
If people are interested, I'll post it when I find it.

We are still waiting for some data on synthetic systems.

[/ QUOTE ]

Yeah, Norm, please post the spread sheet!

Norm_Hall · Dec 10, 2004

I found the spreadsheet. Here it is.

Mangoes · Dec 10, 2004

[ QUOTE ]
The ANSI A300(Part3)-2000 has a guideline in it.
All steel hardware has to be rust resistant. We use galvanized steel.
3/8" lags can be used up to 5" limb diameter. (At install point)
1/2" lags can be used up to 8" limb diameter. (At install point)
5/8" lags can be used up to 10" limb diameter. (At install point)
> 10" to 18" a 3/8" rod is used. (Eye bolt or rod with amon eye)
> 18" to 24" a 1/2" rod is used.
> 24" to 28" a 5/8" rod is used.
> 28" the Standard says N/A for eye bolt and 7/8" for amon eye.

[/ QUOTE ]

Just a curiosity thing but what is the sense in using threaded rod that will fail at 100 000lbs if the service on the cable is going to fail at about 10% of that?

Mike_Maas · Dec 11, 2004

If you study the results, you'll see more pull outs as hole size increases. It would be interesting to see results of 1/2" and 5/8" lags installed in smaller holes.

We have always installed 5/8" lags into 1/2" holes, and 1/2" lags into 3/8" holes. What are you all doing and what's the standard?

Norm_Hall · Dec 11, 2004

Mangoes, We still have to consider the SWL in hardware. It's 5-7 to 1 depending on the manufacturer. As the loads and hardware increase, so does the cable diameter.
1/4" EHS cable is good for up to 20" diameter limbs. (1,200 lbs. SWL)
5/16" EHS cable is good for up to 24" limbs. (2,200 lbs. SWL)
After this the standard jumps to 7/16" EHS cable, which IMO is overkill.
3/8" EHS cable is good for up to 28" limbs (IMO). (3,300 lbs. SWL)
> 28" 7/16' EHS is reco'd. (3,700 lbs. SWL)
EHS= Extra High Strength, 7 strand or 1 X 7.

The largest I have worked with is 3/8" EHS.

Eric_E · Dec 29, 2004

Mark,

Picture of Cobra

Eric_E · Dec 29, 2004

another

Eric_E · Dec 29, 2004

Swedish Bracing System sold by American Arborist Supply

Eric_E · Dec 29, 2004

Here's a hybrid syetem, non-invasive with EHS cable

Mark Chisholm · Dec 29, 2004

Thanks for the pics. Have you ever tried the Tree Save ? from Sherrill? I was going to order some soon. Anyone try it?

Eric_E · Dec 29, 2004

Tom,

A little ways back you asked:

[ QUOTE ]

Does anyone else do a double nut system when bolting or using eye bolts? Washer against tree, nut, washer and nut. That way the tree can grow around the second washer and have more "grab" similar to using screws instead of nails.

[/ QUOTE ]

Yes, I have used this method a few times, mostly in tree house construction. I have been back to a few trees where I used this method and was pleased with the visual inspection of the growth around the extra hardware.

Mahk_Adams · Dec 30, 2004

[ QUOTE ]
I found the spreadsheet. Here it is.

[/ QUOTE ]

Thanks Norm!!

Mike_Maas · Feb 20, 2005

Hey guys, I thought I revive this thread with some new information. Check out the attachment.

tophopper · Feb 20, 2005

interesting test Mike!

did you rig all that up?

Mike_Maas · Feb 20, 2005

Opps sorry, I was so excited that I came up with a way to convert the word file to JPG, I forgot to give credits and source.
It is a file sent to me on request for more information on the fatigue of the strands entering the tree, while using Rigguy cable terminations. Sent to me by Steve Tillitski, Rigguy Inc..