Excerpt Taken From Rigging Lab Academy's ~ Confined Space Rescue: Technician course Confined Space Rescue Split 4:1 Introduction
With the introduction of Petzl Grillons, AZTEKs, and other small mechanical advantage devices, a lot of people don’t use a rig split 4:1 anymore.
If you don’t have access to a Grillon or small mechanical advantage systems like an AZTEK or a set of fours, this is still an easy go-to.
- To begin, dead-end the rope in the system (to the tripod head). Then grab some pulleys (swivel pulleys work the best) and clip the first pulley into the system creating a 2:1.
- You then want to grab a pulley that has a capture on it. This pulley goes to the tripod head. By doing this, we’ve created a 2:1 with a capture device at the tripod head.
- Now, the first pulley is going to go to the feet of our patient. Then go down the line, take another pulley, and clip it in. This pulley will go to the head of the packaging device and then into another capture device at the tripod head.
In doing this, you’ve created a 4:1 mechanical advantage with single pulleys which will allow you to split the system as the need arises once you get the patient closer to the top of the space.
Why Would We Use This?
We use this setup if we don’t have a lot of overhead height. So as an example, if we’re on top of a vat or silo at a brewery, we can be only 2-3 feet to the ceiling. In situations like this, it’s crucial that we have something that enables us to get a full-size body out of the hole in stages.
Split 4:1 Operations - Bottom Side
We have brought the first pulley down to the foot end of the package and hooked it to the patient package.
We have the first pulley that’s going to be removed at the head. This pulley will come off first as we raise the patient up. During this operation, you’ll have the patient attached to a safety line. We have the patient “janed” (using a Petzl Jane) or tethered or lanyarded into that safety line directly. We have the patient in Class II harness and this allows the patient to have their own independent safety with their “mainline” being the rigging of the packaging device and their safety being their Class II harness directly into the safety line.
As they move the package up, the rescuer lifts the head and goes into a vertical orientation. This allows the patient package to move up through the hole vertically while keeping the pulley separated on the actual system
Split 4:1 Operations - Top Side
We’ve got our terminated end into the top of our AHD. This line is then going down to a pulley at the feet. This line is then coming up and through a pulley with a capture device on it.
We’re using a Petzl Pro Traxion but you can use a pulley with a prusik in here instead or whatever you have that will help satisfy that requirement. In our example, the Pro Traxion is locked. The line then goes back down, and a 2:1 is attached to the head. The line comes back up through another capture pulley (in our case, another Pro Traxion) that’s locked to our hauler.
So, we have our 4:1 mechanical advantage system split into two separate pieces (two 2:1 mechanical advantage systems) both at the top and at the bottom which allows us to take a 2:1 out of the system as required.
We used a Petzl ASAP in a pitch head configuration for our safety line and run it more as a pitch head style from the tripod. You could also run a tandem prusik belay or some other belay device up here.LETS MOVE SOME
MOUNTAINS WITH SOME TRAINING SHALL WE?
As we mentioned earlier, the package will move into a vertical orientation. The whole idea of the split 4:1 is being able to split the 4:1 system when we get to a spot where we cannot get the patient physically out of the hole. With the Pro Traxion locked off, we have the ability to leave the package for a minute and to raise the package slowly by hand, which allows us to take the top of the 4:1 out.
We now have the feet on a 2:1 mechanical advantage system. The limiting factor now becomes hooking the toes on the edge of the space. You can haul with the 2:1 until you can get to a point where you’re out of this space. You can now bring it down, and the other rescuers can rest the patient on the edge of the space.
Gear Used In This Blog
CMC and Rock Exotica Swivel Pulleys
LETS MOVE SOME MOUNTAINS WITH SOME TRAINING SHALL WE? Check out the dozens of trailers for over 60 courses!
Peace on your Days
11 thoughts on “Confined Space Rescue Split 4:1 Raise”
Great line up. We will be linking to this great article on our site. Keep up the good writing.
Hi there! This post couldn’t be written any better! Reading through this post reminds me of my previous room mate! He always kept talking about this. I will forward this article to him. Pretty sure he will have a good read. Thank you for sharing!
This blog is definitely rather handy since I’m at the moment creating an internet floral website – although I am only starting out therefore it’s really fairly small, nothing like this site. Can link to a few of the posts here as they are quite. Thanks much. Zoey Olsen
282138 955739Hey. Neat post. There is actually a issue with your web site in firefox, and you might want to check this The browser may be the market chief and a large component of other folks will omit your outstanding writing because of this difficulty. 566149
121249 501960There couple of fascinating points at some point in this posting but I dont determine if these individuals center to heart. There is some validity but Let me take hold opinion until I check into it further. Fantastic write-up , thanks and then we want more! Combined with FeedBurner in addition 37786
49166 324044Quite intriguing subject , appreciate it for putting up. 444321
93310 395386I as nicely believe thence , perfectly pent post! . 591110
Viagra Kosten Mit Rezept stromectol tablets india Isotretinoin Delivered On Saturday Hawaii
Want to buy isotretinoin us free shipping ivermectine msd
This is really interesting! Join YoBit Crypto Exchange
Hi to all, for the reason that I am actually keen of reading this webpage’s post to be updated on a regular basis.
It includes nice material.
Comments are closed.