When using cribbing for load support, why must cribs be placed to bear the load?

• A. To prevent shifting by placing cribs randomly.
• B. To maximize time efficiency by ignoring load.
• C. To minimize material use.
• D. To prevent tipping or crushing by ensuring cribs bear the load.

Answer: (D)

The key idea is that cribbing must actually carry the weight of the load so the system stays stable. When the load sits on cribbing, it should be distributed into the cribbing stack, with the contact surfaces in full contact and the blocks arranged to transfer the force straight down and through the stack. This creates a stable, compression-dominated structure that resists tipping, shifting, or crushing. If the load isn’t shouldered by the cribbing, the weight can concentrate on a small area or move laterally, increasing the risk of the cribbing slipping, deforming, or collapsing under the load.

Choosing to place cribs randomly would not give a stable base and would invite shifting. Ignoring the load in favor of speed defeats safety. Clipping down material use might save resources, but it wouldn’t guarantee that the load is adequately supported or that the cribbing won’t fail under stress. The safe, correct approach is to ensure each crib bears the load to prevent tipping or crushing.