TC
Participating member
Some great rigging from the McMahons -
http://www.youtube.com/watch?v=UqrXO91lqpw&feature=youtu.be&hd=1
http://www.youtube.com/watch?v=UqrXO91lqpw&feature=youtu.be&hd=1
Trivect Rigging Vid
- Thread starter TC
- Start date
It must be the flannel shirts.
- Location
- Longmont, CO
I love their work. They are the best on the planet.
I've always called Trivect Rigging "V-technique Rigging". I like their term better.
I've always called Trivect Rigging "V-technique Rigging". I like their term better.
- Location
- Gibsons BC
Interesting vid. I wonder if that level of control was really required or if it was a bit of an exercise in precision.
- Location
- Hawaii
Kind of reminds me of the pics tkramer put up a year or two back using the grcs and several blocks to lift an entire tree. Nice video,
jp
jp
RopeShield
Carpal tunnel level member
- Location
- Ontario, Canada
Wow!
Love to see people take the work we do to a level of science never seen before.
Our industry needs to take flight. And these people are leading it.
Soar with the eagles!
Love to see people take the work we do to a level of science never seen before.
Our industry needs to take flight. And these people are leading it.
Soar with the eagles!
Daniel
Carpal tunnel level member
- Location
- Suburban Philadelphia (Wayne)
Awesome work no doubt, but not a good model to try to emulate.. IMO.. that is state fo the art science combined with excellent rigging/cutting/climbing techniques, and much needed for the situation, yet not practical for the needs or budgets of the vast majority of work faced by regualr get it done everyday workers...
Very cool to see it being done and see the precision though, and I admire the men that have honed that type of skill/knowledge.
Very cool to see it being done and see the precision though, and I admire the men that have honed that type of skill/knowledge.
How do you calculate the effect of the bend you put in the 200' lever arms as you preload the three lines? They stressed the fact they were using very static bull ropes but the rigging point must move into the load, unless the high blocks in the other trees are guyed off. When you cut the piece off the three spar trees are going to want to return to where they started. It would be interesting to see the figures for this job. There are calculated numbers and then actual numbers, which in my experience are not usually exactly the same.
M
M
You're right Mark, the bend is massive - The heads can travel over 10m as the load is put on them.
Depending on the severity of deflection, the angles may have to be re-measured and calculated.
To answer your question, by pre-tensioning the system to equilibrium, the bend will remain *exactly* the same after it has been cut.
After all, if the pre-tension is correct the correct amount of bend is already created.
You're creating equilibrium BEFORE you cut, so you don't have any kind of load shift. This includes pre-tensioning your high points.
Depending on the severity of deflection, the angles may have to be re-measured and calculated.
To answer your question, by pre-tensioning the system to equilibrium, the bend will remain *exactly* the same after it has been cut.
After all, if the pre-tension is correct the correct amount of bend is already created.
You're creating equilibrium BEFORE you cut, so you don't have any kind of load shift. This includes pre-tensioning your high points.
[ QUOTE ]
Interesting vid. I wonder if that level of control was really required or if it was a bit of an exercise in precision.
[/ QUOTE ]
Exercise Gord! Comeon' man! Precision for fun?! Don't you play with helicopters sometimes?
The level of control was demanded by the customer - the site has significant "cultural, social, historical and spiritual" values to Victoria. The list of things we mustn't damage is painful to a man of death and destruction like myself.
We removed the 200ft tree with 1 climber, 2 groundsman in 5 hours including setup. The setup is the longest part because we cannot spur the other trees, so that took 3 hours. 5 cuts the whole thing was done.
Once setup, we can do any trees within the triangle, with the same level of control.
Without dynamic loading, the size pieces you can take are much larger. 1 ton is still within a safe system.
The system has very limited application. I don't think that should stop me from sharing it.
In the environment we applied it in, I will happily throw the glove down to see if anyone has a system with the same qualities.
2 hours, 5 cuts, 3 guys, 200ft, control.
Interesting vid. I wonder if that level of control was really required or if it was a bit of an exercise in precision.
[/ QUOTE ]
Exercise Gord! Comeon' man! Precision for fun?! Don't you play with helicopters sometimes?
The level of control was demanded by the customer - the site has significant "cultural, social, historical and spiritual" values to Victoria. The list of things we mustn't damage is painful to a man of death and destruction like myself.
We removed the 200ft tree with 1 climber, 2 groundsman in 5 hours including setup. The setup is the longest part because we cannot spur the other trees, so that took 3 hours. 5 cuts the whole thing was done.
Once setup, we can do any trees within the triangle, with the same level of control.
Without dynamic loading, the size pieces you can take are much larger. 1 ton is still within a safe system.
The system has very limited application. I don't think that should stop me from sharing it.
In the environment we applied it in, I will happily throw the glove down to see if anyone has a system with the same qualities.
2 hours, 5 cuts, 3 guys, 200ft, control.
For anyone interested in the sort of environment that this system would be used, read the ArborAge article on William Ricketts.
http://www.sherbrooketreeservice.com/2009/12/opposing-pendulums/
It is a unique environment, and is the only site we use these systems. We share them as more of an academic interest, or 'trick-in-the-bag', rather than some kind of revolutionary technique. Both systems have limited application.
The ISA2011 Presentation slides and software for Trivect are available too.
http://www.sherbrooketreeservice.com/2011/07/trivect-presentation/
http://www.sherbrooketreeservice.com/2009/12/opposing-pendulums/
It is a unique environment, and is the only site we use these systems. We share them as more of an academic interest, or 'trick-in-the-bag', rather than some kind of revolutionary technique. Both systems have limited application.
The ISA2011 Presentation slides and software for Trivect are available too.
http://www.sherbrooketreeservice.com/2011/07/trivect-presentation/
- Location
- Longmont, CO
[ QUOTE ]
...You're creating equilibrium BEFORE you cut, so you don't have any kind of load shift. This includes pre-tensioning your high points.
[/ QUOTE ]
I can see that.
I have to say, it would be fun living and working in that part of the world!
...You're creating equilibrium BEFORE you cut, so you don't have any kind of load shift. This includes pre-tensioning your high points.
[/ QUOTE ]
I can see that.
I have to say, it would be fun living and working in that part of the world!
- Location
- Alabama
So how were the rigging points installed.....from the ground, or did the three trees have to be climbed?
Thanks for sharing the video. Five hours from start to finish for such a complex rigging operation is a statement by itself. It seems from the communication/gear that this is something the crew has done more than once? It's glad to see that some clients/organizations are wiling to pay for this level of rigging.
Having worked in blue gum and mountain ash eucalyptus in Northern California I can appreciate the size and height of those trees
Having worked in blue gum and mountain ash eucalyptus in Northern California I can appreciate the size and height of those trees
- Location
- Columbus Ohio
Watching the butt float away from the cut gave me goosebumps!
- Location
- ma
im using a tripod to cook my dinner right now// the 2 legs of a 4 pound chicken and a beer can,
- Location
- Columbus Ohio
such innoavtion! love beercanchicken
- Location
- Gibsons BC
Hey I didn't mean to sound negative towards the way the job was completed! Just the opposite...
It really speaks to you and Graeme's tremendous skill that the job was completed in 5 hours. It's one thing to have all the tools and techniques in the bag, it's another thing entirely to put them to the kind of use that you guys do.
Is the software a project of yours Angus?
Huge respect for all the jobs you guys do at such an exceptionally high level of expertise and technique.
It really speaks to you and Graeme's tremendous skill that the job was completed in 5 hours. It's one thing to have all the tools and techniques in the bag, it's another thing entirely to put them to the kind of use that you guys do.
Is the software a project of yours Angus?
Huge respect for all the jobs you guys do at such an exceptionally high level of expertise and technique.
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