In rigging operations, what does the term “two-blocking” refer to?

Two-blocking refers specifically to the collision of the hook with the crane boom during rigging operations. This dangerous occurrence typically happens when the lift line is pulled too tight, causing the hook to come into contact with the boom itself. This situation can lead to significant issues, including damage to the equipment, potential injury to personnel, and severe safety hazards.

Understanding two-blocking is crucial for operators because it highlights the importance of maintaining proper distances and monitoring cable tension during lifts. Implementing procedures to avoid this condition is essential for safe rigging practices, such as using height limiters or clear communication among crew members to ensure that the load is lifted safely without risking collision.