What is the purpose of cribbing in crane operations?

• A. To improve crane maneuverability.
• B. To create a stable, level base under outriggers on soft or uneven ground.
• C. To reduce setup time.
• D. To help you align the crane with the load.

Answer: (B)

Cribbing is used to create a stable, level base under outriggers on soft or uneven ground. When a crane lifts, these outriggers transfer the load to the ground, and on soft or uneven surfaces they can sink, tilt, or shift. Cribbing—sturdy stacked blocks arranged properly—distributes that load more evenly and provides a solid, level platform for the outrigger feet. This helps prevent settlement, tilt, or tipping during the lift, keeping the crane within its stability limits. It’s placed on a prepared, firm surface and inspected to ensure the blocks are rated for the load and arranged with proper cross-bracing and a flat top surface. Cribbing isn’t about making the crane move more easily, speeding up setup, or aligning with the load—its purpose is purely to maintain a safe, stable base for lifting on challenging ground.