Leader

Collapse

Announcement

Collapse
No announcement yet.

Confined Space Rescue In A Crane

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • #16
    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.
    John D. Calamia, BS, NREMTP, FP-C
    Firefighter/Flight Paramedic
    Broomall, PA

    Comment


    • #17
      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
      "Training Prepares You...For Moments That Define You

      Comment


      • #18
        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!
        John D. Calamia, BS, NREMTP, FP-C
        Firefighter/Flight Paramedic
        Broomall, PA

        Comment


        • #19
          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).

          Comment


          • #20
            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
            "Training Prepares You...For Moments That Define You

            Comment


            • #21
              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!

              Comment


              • #22
                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.
                John D. Calamia, BS, NREMTP, FP-C
                Firefighter/Flight Paramedic
                Broomall, PA

                Comment


                • #23
                  Ha! How the hell did I overlook that
                  Thanks for pointing that out.
                  Mike
                  "Training Prepares You...For Moments That Define You

                  Comment


                  • #24
                    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***
                    ~Drew
                    Firefighter/EMT/Technical Rescue
                    USAR TF Rescue Specialist

                    Comment


                    • #25
                      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
                      "Training Prepares You...For Moments That Define You

                      Comment

                      300x600 Ad Unit (In-View)

                      Collapse

                      Upper 300x250

                      Collapse

                      Taboola

                      Collapse

                      Leader

                      Collapse
                      Working...
                      X