Which item is a wood box-cribbing configuration?

• A. Modified crosstie
• B. Diagonal crib block
• C. Bridge support panel
• D. Wedge crib component

Answer: (A)

Box cribbing is built to distribute the weight evenly by forming a four-sided frame around the load, creating a stable, box-like structure. A modified crosstie uses crosswise lumber pieces configured to become the sides of that rectangular frame, with additional blocks stacked to complete the box. This arrangement achieves the even contact and lateral stability essential for safe lifting.

Diagonally oriented crib blocks are used for bracing in a diagonal fashion, not to create a four-sided box. A bridge support panel serves as a bridging surface rather than a boxed frame, and wedge crib components are individual wedges used to fine-tune height or fill gaps, not to form a box.