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rigging an anchor and trolleying anchor on steel cable
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By Quinnja
Aug 29, 2012

Hello. First time poster.

I work at a farm used for corporate retreats and am trying to decide the best way to rig an anchor to a suspended steel cable. I have found a way to make a self equalizing 3 point anchor with redundency and backups using 2 prussiks, a coordilette, 3 draws and a large locker.

My questions are:

A: how tight must the steel cable be to support the force of weight?
B: how thick must the cable be to sustain this tension without risk of fail?
C: is it possible?

The reason for this is to balay people climbing a 50 ft rope, laddder, webbing, etc.
If it can be done, id eventually like to set up a trolleying anchor for tightrope training.

Id love to hear thoughts or ideas. Thanks.


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By JoeR
From Eugene, OR
Aug 29, 2012

John M. has it right. Standards for climbing and challenge courses are in whole different worlds. If your corporate retreat farm wants a challenge course element, get it professionally built. Getting some training on how to properly run a high element should be a priority as well.


Read this if you still think that putting this together with no training is a good idea.

adirondoc.com/publications/sudden_death_2002.pdf



I realize this thread smells like a troll, but in the off chance this dude is serious.

If not, good troll.


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By Cor
Aug 29, 2012
black nasty

better use a steel biner on that steel cable tyrol.


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By Peter Franzen
Administrator
From Phoenix, AZ
Sep 9, 2012
Belay

That's an interesting study. Only 5 traumatic deaths, and all were due to not following proper safety procedures.

Definitely know WTF you're doing. I've snapped a couple of improperly loaded aluminum carabiners doing this sort of thing, and when you are working with steel it is easy to surpass the loads intended for normal climbing gear.


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By EvanH
From Boone, NC
Sep 17, 2012

Background: I build courses and zip line tours, all of which require rigging cable in life-safety applications.

Opinion:

DO NOT try to rig this kind of thing yourself without input from a knowledgeable source in the challenge course construction industry. You will most likely kill someone.

Facts:

We rigged a low-hanging, ~75' zip line with cable this summer. It was tensioned lightly, just enough to keep kidds a few feet off the ground when loaded. We then attached a tensiometer to the cable and read the tensions produced under basic loading.

With a 165lb person hanging in the center of the cable, the meter recorded a 2500lb (~11kN) tension acting on the anchor. That's just one person, and he was exerting a static hanging force. Under a belay situation or (God forbid) a lead-stye dynamic fall, the tensions produced would be dramatically higher.

Conclusion:

Call a licensed provider of challenge course construction, preferably one that has attained ACCT Preferred Vendor Member status.


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