Anchor load tests

Mark Chisholm

Mark Chisholm

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I am looking to do some load tests on climbing points and wondering what you all think would be a good test to try? I have a few I'm dying to do, but would love to hear what questions you've always wanted to have answers to.
 
TreeMagineers did a whole lot of load measurements on ITCC Work Climb participants about 6 years (???). I don't recall seeing the results.
They recorded lots of measurements: Climber weight, load cell readings, climbing equipment, etc.

Mark, you were probably in that data ! ?

These were not exactly anchors, but TIP's, ..........
 
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Levi.CO said:
What is really the difference between canopy anchor and base tie loads?
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Levi, I think this is somewhat demonstrated in the video DR Donzeli did with the Arbormaster guys in their art and science of practical rigging. You can find the video now on Youtube under the Arborpod videos. I am not trying to down play what you are saying. It would be nice to see the scientific results in a climbing vs rigging situation.
 
Magnum783 said:
Levi, I think this is somewhat demonstrated in the video DR Donzeli did with the Arbormaster guys in their art and science of practical rigging. You can find the video now on Youtube under the Arborpod videos. I am not trying to down play what you are saying. It would be nice to see the scientific results in a climbing vs rigging situation.
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Time to update some of that info. I think things have evolved since then. Some of it will stand true, but some might change as we are using different configurations.
 
Theres one thing about base anchoring i would like to know. If you are climbing ddrt there is the"wrist rule" whats the min diameeter of wood you put your anchor (dosent work ofcourse on all trees). But would be nice to know a somekind rule for baseanchoring. Did prune lime trees a couple of weeks ago and used alot of srt there. Sometimes i put my anchor realy high in the top. I always loadid it together with my groundi to be sure it holds. But when i got up there and leaned in my rope it dident feel that good at all. When i standed on the branches then it was ok. So it was easy to see the double weight when using a base anchor. Meny times thought if i should have put my anchor lower.

And one thing more: when is the load bigger with a base anchor on to the treetop. When i am starting my ascent or when im up in the treetop.


Hope you guys understand what i mean.
 
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Levi.CO said:
Gotta disagree with you here Caleb, because of friction and rope angles.
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Levi, if you take a look at some of the super old arbor pod videos as I mentioned earlier they demonstrate this force action first hand. Now I do agree it is not doubled but it is close. I myself have demonstrated this first hand at work with our dynometers, I agree it will not be completely doubled due to friction of the limb and more you redirect out but if you are going straight up and and you anchor line is going straight down it certainly does stand the chance to be near about doubled at the point you are anchored over. Just my two cents, I am fat so I worry about this more.
 
andrus kokerov said:
Theres one thing about base anchoring i would like to know. If you are climbing ddrt there is the"wrist rule" whats the min diameeter of wood you put your anchor (dosent work ofcourse on all trees). But would be nice to know a somekind rule for baseanchoring. Did prune lime trees a couple of weeks ago and used alot of srt there. Sometimes i put my anchor realy high in the top. I always loadid it together with my groundi to be sure it holds. But when i got up there and leaned in my rope it dident feel that good at all. When i standed on the branches then it was ok. So it was easy to see the double weight when using a base anchor. Meny times thought if i should have put my anchor lower.

And one thing more: when is the load bigger with a base anchor on to the treetop. When i am starting my ascent or when im up in the treetop.


Hope you guys understand what i mean.
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I am more concerned with trunk diameter where the branch is attached than the size of the branch. I also like to get the force vectors in my favour, through the use of redirects and where i tie the base anchor.

I operate based on the total of these factors so I don't really have a size rule.
 
treegongfu said:
I am more concerned with trunk diameter where the branch is attached than the size of the branch. I also like to get the force vectors in my favour, through the use of redirects and where i tie the base anchor.

I operate based on the total of these factors so I don't really have a size rule.
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How the branch is attached is also important. Co dominant stems and other defects in the canopy also have to be considered
 
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