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Stabilizing Heavy Trucks

Tue, 16 Aug 2011|

Steve White explains why firefighters can't take a small vehicle approach to large vehicle stabilization and examines common cribbing and methods of stabilization. Sponsored by Holmatro.

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Automatically Generated Transcript (may not be 100% accurate)

Welcome the fire -- -- -- -- I'm Steve White. The -- chief -- fire department. In this segment we're gonna talk about stabilizing heavy trucks. One thing we really want to emphasize throughout this whole program is that you can't pick a small vehicle approach -- -- big truck rescue we're dealing with vehicles that are taller. Vehicles and loads that are heavier and be able accomplish this we have to have good solid stabilization not catching the weight of a car. We're gonna start off by talking about four by four -- Four by four -- is the most common used curbing in the fire service not technically we know that it's really three and a half. By three and a half for this segment we're gonna -- a four by four. Another key component is the length of the -- and we're going to be dealing with 24 inch long -- When we build our Oscars is too critical factors that we want to make sure that we're getting correct and that is how much weight this -- box can support. And how high we can safely and effectively build this -- -- When we build the box -- we want to ensure that we have four inches of overhanging. Everywhere there's a point of contact. Anything. Greater than that makes the box unsafe. To be able to figure how much -- we can establish. We're gonna talk about points of contact and -- point of contact is everywhere. The curbing. Comes across the top of another piece of -- each point of contact can support or capture 6000 pounds so we have four points of contact. 6000 pounds times -- -- 24000. Pounds so as long as the entire load is resting across all four points we can capture. 24000. Pounds of -- When it comes to height just two factors we have to understand if we capture all four points. Okay. We can go up to. 48. Inches tall. And we figure that because we're looking at sixteen inches from outside the outside. Times three it's how we come up with 48 so it's not. The dimension -- the length of the 24 inches it's the sixteen inches from where our points of contact -- So sixteen times three is 484. Points of contact we can build this box 48 inches tall. Now we know in some situations based on the positions of the vehicles we may not be able to capture all four points we may be only able to capture. Just two points so that takes -- -- to six and 6121000. Pounds when it's gonna have an impact on our height. We're doing with the same sixteen inches it sixteen. Times one and a -- That comes to 24. Inches so when we capturing two points of contact. We can go up to 24 inches and no more because -- we build -- beyond. The safety factor that it can sway in -- no longer safe. To capture the points of contacts it's effective to use. Wedges and various positions and again the key point is we want to make sure that where we capture the load we wanted distributed down and keep our system. In line at all times. You're gonna build a box -- starting with a good stable base. And we understand that normally there would be a trailer in the way we remove the trailers and we can demonstrate clearly where caskets. Understand too that we have to do -- size up to load and understand. What can impact at the end where we go to tighten the system with -- wages that commuters bolts. Mud flaps. And hoses and other items that are in the way if we can move the hoses out of the way without cutting. That would be perfect. But any aluminum or metal objects are -- -- way we can simply cut off with cutters chiseled morsels walls so that we can gain good. Positive contact. Here with this box -- We're capturing two points. Of contact. So we're stabilizing. 121000. Pounds at the back points of contact using the wedges were able to -- that box crib up. Now we have an effective means a stabilization. For the back of this -- Now we know that in every rescue situation we are not always going to have the perfect scenario. Sometimes it's safer to build the box tower outside of an area and slighted it. Working as a team. Using four by -- to push it. We can get it in place safely and effectively when we tied that we want to double check that because typically our vision is gonna be the front. In order to make sure that we're maintaining that four inches of -- correctly keeping all of our points of contact in line. It's critical that we checked -- two points of contact that we're capturing in the -- -- that we slide the bucks. It doesn't get out before it. Here we're dealing with an -- right. And so I was up it's easy to identify by looking at the back of the -- here we have. -- -- It hopes the -- rest. The problem is that makes the -- very unstable during authentication. Operations. So we want to do is we wanna capture the space between. The cab. And the frame rail. Stabilize it so that now the cab is resting on our curbing and not -- unstable -- right cushions. As another alternative for stabilizing it right -- We're gonna use -- but for stabilization also known as crutches. This is an option for stabilizing. If you have the ability to otherwise you can simply just use the Caribbean wedges that we just covered. One thing that we want to stress. Is that we are not supporting. A load of the entire. Tractor -- -- just simply stabilizing the aluminum -- for movement. Taking it off the -- cushions and putting it on our system that doesn't move to an education operations. And patient removal. During this segment of the stabilization what we're going to do is stabilize the large vehicle on top of a smaller vehicle. It's critical to point out that we have. The car stabilize was always have to stabilize the ground up having a good base as well as shocking the tires of the truck. In this scenario we're gonna use aside -- stabilization devices in two places. We will stabilize the -- It. Decide but the stabilization system we're -- is that a home electoral power strip. It's a combination of making and it mechanical struck after we put it in place. With a hydraulic pump. The Pope and the scenario. Is a manual -- The critical factors that -- the -- makes contact. At the free world -- -- sets distress. We're simply stabilizing vehicle. In this scenario we do not have the intent of lifting the vehicle. What's destruction place we're gonna go right back. And that makes a mechanical stress. Now we're gonna put the driver's side trips in place to stretch were using on this side. Static structures there not put in place with a hydraulic pump. One critical factor remembers it all rescue operations and particularly the initial stabilization phase. We're always trying to strategy be on one knee. By being on one -- that allows us to quickly move out of the areas in the -- the load ships. We comes out of balance. It's also important when you're working on one -- to make sure that you always have a means of -- interest clear. Behind you you don't want any tools or equipment in your way if you wanna move out from the -- quickly. The principles and -- stress. Are the same as if -- stabilizing -- cart it's an a frame we're trying to maintain and stay within 45 degree angle. Good solid positive contact this is just to stabilize not to lift or raise the vehicle. Again or -- is making firm positive contact with the -- world and the ground. Not to any moving parts. On the truck. For this part of -- stabilization segment we want to simulate a common accident. With a car. Underneath -- semi trailer known as an underwrite. Looking -- -- stabilization. We're sticking with our -- for its long -- Building our solid base. All the way up four points of contact -- when it reaches the top the outside section is what we refer to as the rail. Underneath our actual floor -- -- run from side to side. Typically -- based anywhere from tenth to sixteen inches apart so it's pretty important that we either read the rivets. To where it's attached -- physically go underneath size up where those floor -- are. Because the -- outside points of contact we'll catch the rail. The back two points or contact and the -- box will catch the floor -- -- catching all four points we are able to say that we -- be supporting 24000. Pounds without exceeding the Max -- A 48 -- as we transition to the other side of the car. We utilized a -- system. One thing that we want to point out about the -- is the placement also should be at the floor joist. Good solid positive contact -- maintaining a 45. Degree angle and we're tightening. Our ratchet straps in this scenario -- using. To ratchet straps. Between the -- on either side of the truck. As we close this stabilization segment we just want to emphasize that we covered just a few basic scenarios for simple stabilization. Loads weights can vary based on the size of the trucks. So -- -- will use these tools are good starting point. We'd like to thank -- much -- for sponsoring this section trail mix thanks for watching.

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