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Cribbing and Paratech Overview

A brief overview of cribbing techniques and capacities, and Paratech rescue strut load capacities.

Chris Beswick

on 17 October 2012

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Transcript of Cribbing and Paratech Overview

PARATECH OVERVIEW All members should be familiar with vehicular stabilization using Paratech struts, general cribbing techniques and capacities, airbag capacities and lifting techniques. This is not considered technical rescue. Douglas Fir 4X4 wood cribbing is most commonly used by Avondale Fire-Rescue Douglas Fir has a crush capacity of 500psi 6000 X 4 = 24,000 lbs. 500 x 3.5 x 3.5 = 6125 lbs. Most stable Less stable Least stable SQUARE CRIBBING Load capacity can be increased by adding members. Each contact point equals 6000 lbs. 9 contact points = 45000 lbs. Cribbing which is not square is less stable. Height:width should not be greater than 1:1 For offset loads, wedges may be used. Top cribbing must be flush with the load. The center of the load should be in the center of the cribbing to prevent horizontal slippage. Sloped loads have two primary forces acting upon them: gravity and slope force. Gravity produces a vertical load force, while the slope force produces load acting down the slope. Stack cribbing may be used to a height of less than 3’ against a sloped surface with an angle less than 15 degrees. CRIBBING SAFETY!!! When placing cribbing pieces, never put a part of
your body between the load and the cribbing.
Use a tool or another piece of cribbing to
maneuver it into place. During cribbing
operations, the use of personal protective
equipment is necessary to ensure safety. Keeping a 4" margin at the edges prevents a catastrophic failure. Wood can crush up to 20% without failure HIGH-PRESSURE AIR BAG BASICS cribbing Air bags work on a simple proven law of physics: for each pound per square inch (psi) of compressed air inflated into a bag, the force is multiplied over the bag's entire surface area, creating lifting force. For example: a 30" x 30" has a max lifting force of 106,200 pounds, or 53 tons.

30 inch x 3o inch = 900 square inches x 118 psi = 106,200 lbs. Firefighter version:
little bag, little lift
big bag, big lift. Note: air bags have the most lifting power at 1" of rise. AFR Airbag Sizes: 11" = 6 ton
13 ton x 2
22 ton x 2
32 ton x 2
50 ton x 2
36" = 70 ton High pressure air bags are not designed for lift height, but rather lift force.
Crib underneath the bags (with a solid platform) in order to get them as close as possible to the object being lifted.
You may have to reset the bags for greater lift. When possible, have the hoses connected to the bag before placing under the load to minimize exposure, and to eliminate the possibility of positioning the air inlet under the load.
Close all valves before turning on the air source to reduce the risk of an uncontrolled lift.
When using two bags for height, place the larger one on the bottom. Always inflate the bottom bag first. Do not stack more than two bags.
Never place wood between two bags. It could slip out.
Operator should stand at an angle to the bags. AIR BAG SETUP air inlets on opposite sides larger bag on the bottom ground pad or plywood to protect the bag and to maximize surface contact area When stacking bags, total lifting capacity is designated by the smallest bag.
Inflate bags slowly
Crib as you go
A good general practice is to inflate to only 75% of the bag's capacity.
Reduce a bag's capacity by 50% when lift > 1".
When conditions permit, use pads for protection.
Always wear PPE.
Never work under a load supported only by air bags.
Bags should be inspected weekly, including an operational test.
Only one person should be giving lift commands. Call bags by hose color instead of location. Operations Safety Avoid high temperatures (above 220 degrees)
Avoid sharp objects
do not carry bags by the air inlet Damage Prevention DON'T MAKE THE SAME MISTAKE
THAT THESE GUYS MADE!!! Air bags aren't just for lifting. Think outside the box! Paratech Struts:
Not just for TRT all AFR members should be familiar with
basic strut placement for vehicle stabilization. mid-size car = 1.5 tons (3000 lbs.) full size SUV = 3 tons (6000 lbs.) semi truck, no trailer = 10 tons (20,000 lbs. 0.055 tons (110 lbs.) school bus = 14 tons (28,000 lbs.) semi trailer 22 ton capacity (44,000 lbs.) rail car 30-140 ton (60,000-280,000 lbs.) locomotive 125-250 ton (250,000-500,000 lbs.) Boeing 747 300 ton, empty (600,000 lbs.) AFR Vehicle Stabilization Kits TO ENSURE THAT THE VEHICLE DOESN'T MOVE! WHY DO WE STABILIZE? must anticipate:
affect of patient movement or load shift
environmental affects
affects we may have on the car
potential movement through extrication efforts why is stabilization necessary here? what about here? THANK YOU FOR YOUR TIME IT IS IMPORTANT TO FOLLOW UP THIS CLASSROOM PORTION WITH HANDS-ON CREW TRAINING. GOOD LUCK AND TRAIN HARD!!! Armchair quarterback time: critique this scenario
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