Below are two Rigging Wall Charts from Lifting Gear Hire. The first chart covers some basic Center or Gravity and Weight of Material. The second chart covers sling tensions and load angles. Some good quick tips and information for rigging and lifting.
Below are links to the complete Wall Charts from Lifting Gear Hire:
Here’s another chart that explains the load angles:
Stabilization and Electric Vehicles
The battery weight and location are important considerations for stabilization.
One of the fastest methods of initial stabilization is to immobilize the vehicle by turning the 12-volt system OFF. Securing the ignition is accomplished by obtaining the key fob or keys and put them in a rescue apparatus Furthest away from the scene. Another quick, initial stabilization option are wheel chocks.
Chocks used during fire pumping operation are an excellent option. However, often a line is stretched off the apparatus and the engineer used the chocks on the apparatus. Many extrication teams use two wheel chicks tied together with a rope. Turtle Plastics has chicks that are lightweight and easy to deploy.
Stabilize the vehicle with cribbing, by removing air from the tires, or utilize the Lift Airbag Equipment for rescue.
Wheel chocks must match the size of the tires on the vehicle and used in pairs Tire size is designed to be proportional to the vehicle’s weight and size.
Three main factors affect the performance of wheel chocks:
- The angle of the road surface, called slope or grade. Parking on an angle greater than 10 degrees increases the risk of the car rolling off or over the chock.
- The size (height) of the wheel chock compared to the wheel height. Extra large wheel chocks are suitable for e.g. parked air craft where wind forces may come into effect.
- The surface slip or friction of the road surface, as the wheel chock may slide downhill due to wet grass or ice. Increasing the size of the wheel chock will not necessary allow the parking on inclines greater than 30% gradient (16.6 degrees).
- Keep in mind, the vehicle most likely will require full stabilization which should include cribbing and struts where necessary. Vehicles like a side resting vehicle or roof resting require struts to stabilize.
TECH TIP: Shorten the Strap
Often on side resting vehicles, once a strut is placed the fixed end of the ratchet strap is too long to tighten the strut.
Ratchet Strap Handle
Often on side resting vehicles, once a strut is placed the fixed end of the ratchet strap is too long to tighten the strut. First off, if you are using a cluster hook set, use the smallest hook possible. Secondly, if possible use the hook on the fixed end of the ratchet strap. Finally, you can gain approximately 6 inches of space by folding the fixed end strap in half and attaching the hook on the handle as shown in the picture below.
Never saddle a dead horse!
The Associated Wire Rope Fabricators, INC Facebook is a great page for tech rescue personnel to follow. Below is a image that was posted on their Facebook page under the title “Never saddle a dead horse!”. The image explains how
Never saddle a dead horse!
The Associated Wire Rope Fabricators, INC Facebook is a great page for tech rescue personnel to follow. Below is a image that was posted on their Facebook page under the title “Never saddle a dead horse!”. The image explains how U-Bolt Saddle Clamps should be used on wire rope.