new article on Firehouse.com

Firefighter Rescue Crews: Next-Level Cribbing.

https://www.firehouse.com/rescue/technical-rescue/article/55139253/firefighter-rescue-crews-next-level-cribbing

3 tools having their useful range of operation increased, all crib stacks are 12” high.

3 RescueBlox configurations raised 12” above tools design limitations. Adding RescueBlox to an assembly will give you an graduated height tool that can be point loaded and distributed more evenly to the crib stack.

Marry cribbing to RescueBlox will be resource efficient (It would take 11 4x4’s just for the airbag platform and another 8 for the jack platform), timely (less components) and increase safety (having the assemblies lashed together)

A sloped load platform used for a prybar and RescueBlox used on a second platform to capture lift gains.

24” Crib stack with flat airbag is a good work around for departments that do not have room or dollars for high lift airbags. With a sloped crib stack the airbag will be in a safer position as the lift proceeds.

A 25.5” platform increases the useful range of the high lift bar jack.

1st article on Firehouse.com Online for instruction on

“lashing a Cribbing Stack”.

https://www.firehouse.com/rescue/vehicle-extrication/article/21284825/lashing-a-cribbing-stack

Shown as 3 Cribbing supports extending the useful range of these tools.

RescueBlox will be distributed small load profile to the entire crib stack.

wood cribbing

light, strong, natural

Compression load is calculated in psi. 4x4’s are a nominal thickness of 3.5”. ( 3.5” x 3.5” =12.25”). This creates a 12.25” square inch column to the ground. 12.25” x 500 psi= 6125 of each column times the number of columns created and loaded by your assembly.

If the load isn’t close to your crib stack load rating. This conventional loose overhang is the most likely failure point.

If load rating isn’t an issue adjust to a smaller overhang to give you a larger footprint.

Alternating courses 2 members by 3 members creates 6 columns if evenly loaded rated at 36,000 lbs. Held together with 1 strap

If you are carrying 24” cribbing and very large platform can be assembled.

Hybrid Assemblies

Making a Case for 4x6’ cribbing and other alternatives

If 4x6’s are used for the top course of your crib stack they offer more strength per unit than a 4x4 if point loaded.

larger cribbing used to interface the load will absorb more damage and remain strong if point loaded.

A Fulcrum

A 24,000 lbs. assembly If we have 4) 4x4 columns to the ground. The extra cribbing creates a large footprint and secured fulcrum.

This fulcrum or High Center Crib Stack will hold 19,250 lbs. [(5.5 x 3.5)2]500psi

Header assembly

If a NOW support is needed while waiting for the specialized equipment, assemble a horizontal crib stack with airbag and lowered into the void.

Positioned assembly with long reach tools to stabilize or chase load as it is raised. Use the excess strap to retract assembly as load is lowered. This technique keeps personnel out from under load until it is secured.