Concrete vibration removes trapped air and ensures full compaction around reinforcement and formwork. Using a poker vibrator or external vibrator incorrectly can cause segregation, formwork failure, and hand-arm vibration injuries. Operatives must understand how to vibrate concrete safely and effectively to achieve the specified quality and protect their health.
Key Hazards
Hand-arm vibration syndrome from prolonged poker vibrator use
Formwork blowout from over-vibration or excessive pour rates
Concrete segregation from incorrect vibrator insertion technique
Electric shock from damaged vibrator cables in wet conditions
Control Measures
Limit individual exposure to vibrating equipment using the daily exposure action value guidance.
Rotate operatives on vibrator duty to reduce individual hand-arm vibration exposure time.
Insert the poker vertically into the concrete and withdraw slowly to avoid trapping air.
Do not touch the reinforcement or formwork with the vibrator head to prevent damage.
Monitor formwork tie pressures during vibration and stop if any signs of movement appear.
Inspect all vibrator cables, plugs, and connections before use in wet concrete conditions.
Use low-vibration equipment where available to reduce hand-arm vibration exposure levels.
Brief operatives on the correct vibration pattern, insertion depth, and spacing for the pour.
Report any tingling, numbness, or whitening of fingers to the supervisor for health surveillance.
Remember
Rotate vibrator operators regularly to reduce individual hand-arm vibration exposure
Insert the poker vertically and withdraw slowly for effective air removal
Never touch reinforcement or formwork with the vibrator head during compaction
Monitor formwork closely during vibration and stop if signs of movement appear
Report any tingling, numbness, or whitening of fingers to your supervisor immediately
Applicable Legislation: Control of Vibration at Work Regulations 2005 · PUWER 1998 · COSHH 2002 · Electricity at Work Regulations 1989