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Confined Space Rescue In A Crane

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  • ProgressiveRescue
    replied
    Originally posted by FiremanLyman View Post
    Mike, this is the type of crane stuff we are talking about?



    Noticed on firespecialops dot com they had an exterior rescue on one in long beach... http://firespecialops.com/2010/11/03...-2-from-crane/

    I know it is not what we are talking about, but I am bored working on Christmas.

    ***Stupid picture wouldn't post***
    That would be it! I'm going to try to get access again and set some rigging up for pictures.
    Mike

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  • FiremanLyman
    replied
    Mike, this is the type of crane stuff we are talking about?



    Noticed on firespecialops dot com they had an exterior rescue on one in long beach... http://firespecialops.com/2010/11/03...-2-from-crane/

    I know it is not what we are talking about, but I am bored working on Christmas.

    ***Stupid picture wouldn't post***

    Leave a comment:


  • ProgressiveRescue
    replied
    Ha! How the hell did I overlook that
    Thanks for pointing that out.
    Mike

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  • jdcalamia
    replied
    Mike,

    I'm diggin' the over engineering. ONe thing to possibly change is u-channels on both ends may be a little more secure than the set up you described other than that good idea.

    Dylan,

    You have me intrigued with this hitch. I'll be playing with it next week on my dayworks.

    Leave a comment:


  • rescuedylan
    replied
    Mike,

    When you have a chance to look on youtube or google videos, type in death grip hitch. I found the smallest diameter pole object that I could find ( 9 or 10mm rail for my sons safety gate). I tied a 5 wrap down and 6 wrap up on it and had no movement. I had to stop putting weight on it when the whole gate started to want to come out of the wall I have it bolted into. I used a 8mm cord. Again I dont expect you to use this hitch for your training day, but this is something worth looking into when you have a chance to play around. It just hasnt slipped on me yet. Also good point to make out on the physics of this hitch, the way it works on its self under a load is to chocke in two diffrent dirrections with the wraps and then the load end pinches down on the whole thing. For this rescue set up you will not find a better hitch.

    Ok, so that is about as much " obsessing" as you will ever see me do!

    Leave a comment:


  • ProgressiveRescue
    replied
    So.... I just tried the 3 wrap on a small diameter vertical metal post in a raining to see how it performed. I figured if it could lock in vertically we'd be in business. There was some slippage so I tried a 4 wrap, that performed a little better but still some slippage occurred. So here's my over engineered idea. Let's keep the tandem 3 wraps on either side creating the load sharing system like you said (nice idea) ***Brace yourself here comes the over engineered part*** To prevent forward slippage (movement) let's shoot two struts rigid plate on the bottom and U channel on top. The U channels will receive the handrails thus blocking the rope from moving forward. Oh yes I'm thinking tonight. Maybe a bit to much.
    Mike

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  • rescuedylan
    replied
    I know the 8 or 9mm would work just fine, you dont want to be too large due to not having enough grip. The only issue I would see with the prussik is the possabilty of it still slipping. Although if you place enough wraps in it there should be no problem. There are a few key things to look at when placing a wrap on an object when thinking abut slipping. first is diameter of the object, that will tell you what size of line you will need and the second is what is it coated/painted with. That will give you an idea of how many wraps you will need (example, bare polished metel or steel= more wraps, rough paint= fewer wraps).

    Leave a comment:


  • jdcalamia
    replied
    Gets you well above the MBS that we'd be happy with/require. With two on each rail we're looking at 18,000 lbs, plus each one is backing the other up all the way around. Not a bad anchor. All that chatter and ending up with a simple solution we've all used a thousand times! Slow night in UD gives you alot of time to think, doesn't sound like you have the same luxury tonight Mike!

    Leave a comment:


  • ProgressiveRescue
    replied
    Originally posted by jdcalamia View Post
    For that matter how bout using a long three wrap prussik on each handrail and coming together with a tri-link or delta. Same principle as the death grip knot with known numbers to work with.
    Hmmm...Not a bad idea John. Let's sweeten the pot a little and use two three wrap prussiks on each side
    MIke

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  • jdcalamia
    replied
    For that matter how bout using a long three wrap prussik on each handrail and coming together with a tri-link or delta. Same principle as the death grip knot with known numbers to work with.

    Leave a comment:


  • ProgressiveRescue
    replied
    Originally posted by rescuedylan View Post
    I know that this idea will most likely not be used for this training ( and I fully understand ), but this is where the Death Grip hitch comes into its own. If you tie it using two 8 or 9mm cords with a figure eight /nine to connect both of them it would hold just as bomber as the hand rails. Granted I cant give you any numbers for how much the hitch can hold before it fails, but I have used it for heavy pulls in the past as an anchor just to play with it and it worked great every time with no slip or break. Just a thought fr when all else fails.
    Dylan,
    I've never used that knot and I saw the Pic you posted (I think it was you). Do you think that the small diameter of the handrail would make that application difficult?
    Mike

    Leave a comment:


  • jdcalamia
    replied
    How bout this...once you twist the windlass, take the end of the picket that you would be pushing down on and throw a clove hitch around it, then anchor it to the bottom of the rails or something else close to the ground. This should keep the tension in the system since you are only twisting the picket one way. If you go with a butterfly as the connection point in the actual anchor it should keep the COD pulley low enough that the windlass won't be in the way.

    Leave a comment:


  • rescuedylan
    replied
    I know that this idea will most likely not be used for this training ( and I fully understand ), but this is where the Death Grip hitch comes into its own. If you tie it using two 8 or 9mm cords with a figure eight /nine to connect both of them it would hold just as bomber as the hand rails. Granted I cant give you any numbers for how much the hitch can hold before it fails, but I have used it for heavy pulls in the past as an anchor just to play with it and it worked great every time with no slip or break. Just a thought fr when all else fails.

    Leave a comment:


  • ProgressiveRescue
    replied
    Ha! I was kicking around the idea of wrapping and frapping the top as well John. I also had the idea of wrapping and tensioning the top like you would for a picket system.....Still thinking in between runs tonight on how I would keep the tension in the rope. In a picket system the picket keeps it in place, here we have nothing. Heading on another run....
    Mike

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  • jdcalamia
    replied
    I follow your train of though here, but I can't help but to keep looking at the angle that the rope would be coming out of the shaft and how it would be pulling on the COD attached to the top of the rails. Maybe in addition to your load sharing hybrid, wrap the top rails with a series of tight wraps around both rails and then fraps (lashing style) to tighten it up just as a backup to create a stop of sorts. Maybe overkill, but I just don't like the angle between the top of the rails and the top of the shaft opening as well as the chance that the COD could slip down the rails. I'm sure that would create a decent shock load as well as really put the screws to you when you have to muscle the guy out of the shaft. Then either another COD maybe off the electrical conduit to keep the rope in the center of the shaft or padding the hell out of the edges. OK, that is definitely overkill, and maybe not doable, but some thoughts I got going through my dome! I'm thinking belay off the bottom rails to minimize the fall factor/distance.

    Leave a comment:

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