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Using Bolts for Zip Line?
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j5Zolmaz


Sep 18, 2011, 8:09 PM
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Using Bolts for Zip Line?
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I am looking to run a Zip line across a river without trees around and I would like to know if I can use Bolts to support it. My idea is to use 3/8 SS (edit - SS Cable) from very large boulders attached to two eyes through bolt hangers on each side.

The excursion will not take place until next year in Northern CA. around Sep. so there will be plenty of time to plan and prepare.

I need ideas and safety is my number one concern.

Would this be safe and would the bolts support up to 250Lbs of equipment or Person with the stress of a Zip line?

All information would be very well accepted. Thanks.

Ray.


(This post was edited by j5Zolmaz on Sep 19, 2011, 12:39 AM)


TarHeelEMT


Sep 18, 2011, 8:15 PM
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Re: [j5Zolmaz] Using Bolts for Zip Line? [In reply to]
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You're going to die.


j5Zolmaz


Sep 18, 2011, 8:26 PM
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Re: [TarHeelEMT] Using Bolts for Zip Line? [In reply to]
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Unimpressed Death and taxes. /sigh


USnavy


Sep 18, 2011, 11:01 PM
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Re: [j5Zolmaz] Using Bolts for Zip Line? [In reply to]
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j5Zolmaz wrote:
I am looking to run a Zip line across a river without trees around and I would like to know if I can use Bolts to support it. My idea is to use 3/8 SS from very large boulders attached to two eyes through bolt hangers on each side.

The excursion will not take place until next year in Northern CA. around Sep. so there will be plenty of time to plan and prepare.

I need ideas and safety is my number one concern.

Would this be safe and would the bolts support up to 250Lbs of equipment or Person with the stress of a Zip line?

All information would be very well accepted. Thanks.

Ray.
My suggestion would be to hire a professional to do your stunt, or obtain professional instruction. In any case, to answer your question, no I would not use 3/8" bolts. I would use 1/2" or larger bolts. Are you going to use steel cable for the zip line? If so, what diameter? How long is the zip line going to be and how tight are you going to make it? The answer to those questions will heavily dictate how much of a load the anchor points will see.


(This post was edited by USnavy on Sep 18, 2011, 11:02 PM)


j5Zolmaz


Sep 19, 2011, 12:28 AM
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Re: [USnavy] Using Bolts for Zip Line? [In reply to]
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I was planning on using 3/8 SS cable, it's the Bolts that I am concerned about
with the stress being a Horizontal pull and how much certain bolts can handle
without sheering off.

Sorry I forgot to add Cable after the 3/8 SS.

The Line will be 75ft max from one side to the other.

I'll post pictures of the area once I find them on my spare drive and condense them.
But it is hard rockface boulders.

I've searched the internet for technical information but I cannot find the stats that I need.
Tree to Tree is all I can find, but not using rock for a Zip-line.

The boulders on the river are hard and not sandy.


Thank you,
Ray.


JimTitt


Sep 19, 2011, 4:13 AM
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Re: [j5Zolmaz] Using Bolts for Zip Line? [In reply to]
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The organisation in the US which writes the standards for zip lines is http://www.prcainfo.org/.

Usually the cables have to be 6500kg or 14,000lbs breaking load and the anchors need a working load to match so no climbing gear is suitable. We´ve made highline anchors to the same spec and use 3 X 10,000kg anchors to get the working load.
Commercial zip lines in most countries require 2 wires independently anchored, one to slide and a safety. The strength calculations should take into account the weight of a rescuer.

Jim


binrat


Sep 19, 2011, 6:04 AM
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What is the difference in elevation between the start / finish location??
Is it staying up on for a long duration or a weekend blast??


jeepnphreak


Sep 19, 2011, 8:17 AM
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75 feet... that hardly seem far enough to be worth the effort.

But getting back you your question. A fully tensioned zip will be a bit much for standard climbing bolts.


ceebo


Sep 19, 2011, 9:10 AM
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Are you not scared their may be to much outward pull on the bolt?.


marc801


Sep 19, 2011, 9:56 AM
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j5Zolmaz wrote:
I was planning on using 3/8 SS cable, it's the Bolts that I am concerned about
with the stress being a Horizontal pull and how much certain bolts can handle
without sheering off.

Sorry I forgot to add Cable after the 3/8 SS.

The Line will be 75ft max from one side to the other.

I'll post pictures of the area once I find them on my spare drive and condense them.
But it is hard rockface boulders.

I've searched the internet for technical information but I cannot find the stats that I need.
Tree to Tree is all I can find, but not using rock for a Zip-line.

The boulders on the river are hard and not sandy.


Thank you,
Ray.
You need the services of a professional rigger, not some answers you get from the net.


binrat


Sep 19, 2011, 10:49 AM
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Re: [marc801] Using Bolts for Zip Line? [In reply to]
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marc801 wrote:
You need the services of a professional rigger, not some answers you get from the net.
+1,


Kartessa


Sep 19, 2011, 2:07 PM
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Re: [binrat] Using Bolts for Zip Line? [In reply to]
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binrat wrote:
marc801 wrote:
You need the services of a professional rigger, not some answers you get from the net.
+1,

Holy Consensus Batman!


j5Zolmaz


Sep 19, 2011, 6:51 PM
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Re: [binrat] Using Bolts for Zip Line? [In reply to]
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Hi Binrat, the Elevation will be no more than 10ft. There is no other way across the river without a 1/2 mile hike.


crashkickave


Sep 19, 2011, 7:10 PM
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Re: [j5Zolmaz] Using Bolts for Zip Line? [In reply to]
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you gonna zip line into the river?


j5Zolmaz


Sep 19, 2011, 7:16 PM
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ceebo wrote:
Are you not scared their may be to much outward pull on the bolt?.

Yes, that was my main concern. I figured that posting here
would lead me in a safe direction, or to extract some ideas.

I was also considering anchoring a boulder then wrapping the cable around it and just use the bolts to keep it from slipping on the other side.


j5Zolmaz


Sep 19, 2011, 7:22 PM
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crashkickave wrote:
you gonna zip line into the river?

As hot as it gets there, I'll drop off the line a few times. Why not. Mainly I need it to transfer equipment.


crashkickave


Sep 19, 2011, 7:27 PM
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oh word good idea about equipment. i've always wanted to zip line into water, it should be pretty damn fun.


acorneau


Sep 19, 2011, 9:12 PM
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j5Zolmaz wrote:
Hi Binrat, the Elevation will be no more than 10ft. There is no other way across the river without a 1/2 mile hike.

Almost sounds like you're wanting a Tyrolean traverse instead of a zip line.

A good resource would be contacting one of the vendors from the ACCT...

http://acctinfo.org/...amp;subarticlenbr=76


j5Zolmaz


Sep 19, 2011, 10:01 PM
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What a fantastic concept, I just went to Chockstone and read up on it. Incredible.


binrat


Sep 20, 2011, 4:37 AM
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acorneau wrote:
j5Zolmaz wrote:
Hi Binrat, the Elevation will be no more than 10ft. There is no other way across the river without a 1/2 mile hike.

Almost sounds like you're wanting a Tyrolean traverse instead of a zip line.

A good resource would be contacting one of the vendors from the ACCT...

http://acctinfo.org/...amp;subarticlenbr=76
Or a highline. Depending on the height off of the water, that will determine what setup will happen.


j5Zolmaz


Sep 20, 2011, 7:09 PM
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Or a highline. Depending on the height off of the water, that will determine what setup will happen.
Max height will be around 10-15ft above the water. It's just to
get across the river with equipment.
I'm to old to hang from 100ft.


feetfirst


Sep 27, 2011, 6:09 PM
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If you're set on doing a zip line than Im probably not going to be much help but with moving gear...? I would go out and by a book on high angle rope rescue, you can find some cheap used ones at text book stores or on amazon, the systems are tested and work great, some are a little more complex, but just break it down in steps, i couldn't find a website that would allow the information to be disclosed without some kind of payment but nothings to stop you from searching for yourself.


j5Zolmaz


Sep 29, 2011, 11:31 AM
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Good tip. I'll check Amazon for books.

Thanks.


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