BRD/Specific/TBT-BRD-002

Precast Beam Installation

Bridges & Structures › Specific › Precast Beam Installation

Presenter		Project
Location		Date

Precast beams are heavy concrete or steel elements manufactured off site and lifted into position to form bridge decks.
Individual beams can weigh from 10 to over 100 tonnes, requiring detailed crane lift plans and specialist lifting equipment.
The lift plan must be prepared by an appointed person and account for beam weight, rigging, crane capacity, and wind effects.
Bearing pads or mortar beds must be prepared and checked before beams are placed to ensure correct seating and alignment.
Exclusion zones must be established beneath and around the lift area throughout the entire beam installation operation.
Temporary bracing between beams must be installed immediately after placement to prevent lateral instability and toppling.
Beams must not be released from the crane until the lift supervisor confirms correct positioning and temporary restraint.
Weather monitoring is critical — beam installation should stop in high winds due to the difficulty of controlling long, heavy loads.
Communication between the crane operator, slinger, signaller, and lift supervisor must be continuous and unambiguous.
Beam delivery vehicles require specific access routes, turning areas, and offloading procedures to prevent ground damage and instability.

Extreme weight	Precast beams are among the heaviest single lifts in construction — any failure drops tonnes of concrete from height.
Lateral instability	Beams standing alone without temporary bracing can topple sideways, crushing workers and damaging the permanent structure.
Wind vulnerability	Long beams catch wind during lifting, becoming uncontrollable — stopping in high winds prevents catastrophic loss of control.

Don't

Prepare a detailed lift plan for each beam, approved by the appointed person.
Verify crane capacity for the beam weight, radius, and boom configuration required.
Check bearing pads and mortar beds are prepared and level before beam arrival.
Establish exclusion zones beneath and around the lift area before any lifting begins.
Install temporary bracing between beams immediately after each is placed.
Confirm correct beam position and restraint before releasing the crane hook.
Monitor wind speed and stop beam installation when conditions exceed safe limits.
Maintain continuous communication between crane operator, slinger, and lift supervisor.
Plan delivery vehicle access routes with adequate turning and offloading space.
Brief all personnel on the beam installation sequence and their specific roles.

DON'T lift beams without a detailed, approved lift plan from the appointed person.
DON'T exceed the crane's rated capacity for the specific radius and boom configuration.
DON'T place beams onto unprepared or incorrectly levelled bearing surfaces.
DON'T allow anyone within the exclusion zone during beam lifting operations.
DON'T leave installed beams without temporary bracing — they can topple laterally.
DON'T release the crane from the beam until correct position and restraint are confirmed.
DON'T install beams in high winds — long beams become uncontrollable when airborne.
DON'T allow communication breakdowns between crane operator and ground team during lifts.
DON'T route delivery vehicles over soft ground or near excavation edges without assessment.
DON'T begin beam installation without a full briefing for every person involved.

See also: Bridge Construction Safety Awareness | Lifting Operations Awareness (LOLER)

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