29d • General discussion
Case Study 100: Hook Block and Chain Detachment During Setup.
Category: Erection / Set-Up Interface Risk
Incident Overview
On a major London project, an incident occurred during crane-related set-up activity where an over-hoist chain became entangled, causing chain and block to fall free. No one was injured, but the drop potential was severe.
What Went Wrong
Unexpected movement/entanglement occurred mid-task
Secondary retention/controls were not sufficient to prevent a drop
A “non-lifting moment” became a lifting incident
Key Lessons Learned
Set-up phases carry lifting-level risks
Suspended components require the same controls as live lifts
Secondary retention prevents drops when things snag
Safety Recommendations
Control entanglement hazards, maintain exclusion zones during set-up, and ensure secondary retention where drop risk exists.
Incident source
Crossrail safety alert on auxiliary jib chain detachment causing chain/block to fall.
●LOLER Reg. 8 – Set-up phases require control.
●PUWER Reg. 11 – Falling object risks must be prevented.
●PUWER Reg. 4 – Equipment must be used safely.
●BS 7121-1 – Set-up activities are lifting operations.
Key point
Set-up is not “low risk”.
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Case Study 100: Hook Block and Chain Detachment During Setup.
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