BLD/General/TBT-BLD-022
Structural Frame Sequence and Stability
Building & Structural Works › General › Structural Frame Sequence and Stability
Toolbox Talk
Structural Frame Sequence and Stability
Erecting a structural frame in the wrong sequence can cause partial or complete collapse. Steel, concrete, and timber frames all rely on a designed erection sequence to maintain stability at every stage of construction. Temporary bracing, propping, and connections must be installed as specified before moving on to the next section. This talk covers the key principles of safe frame erection and what operatives must know.
Key Hazards
Partial or total frame collapse due to incorrect erection sequence
Instability during erection before permanent bracing is connected
Falling steelwork or precast elements striking workers below
Wind loading on partially erected frames causing overturning
Control Measures
- Follow the erection sequence drawing exactly as designed by the structural engineer.
- Install temporary bracing and propping at every stage specified in the method statement.
- Check that all bolted connections are made to the required torque before releasing crane support.
- Confirm wind speed limits for erection activities and cease work when exceeded.
- Ensure exclusion zones are established beneath all frame erection operations.
- Use tag lines to control the position of frame elements during crane placement.
- Verify that foundations and base plates are complete and checked before starting erection.
- Brief the erection team on the sequence, lifting plan, and temporary works requirements each day.
- Report any discrepancy between the design drawing and site conditions before proceeding.
Remember
- The erection sequence must match the structural engineer's design drawing exactly
- Temporary bracing keeps the frame stable until permanent connections are complete
- All bolted connections must be tightened to specification before releasing crane support
- Wind speed limits for frame erection must be monitored and strictly obeyed on site
- Exclusion zones beneath erection work must remain in place throughout the operation
- Never start erection until foundations and base plates are confirmed as satisfactory
Applicable Legislation: CDM Regulations 2015 · BS 5975:2019 (Temporary Works) · BS EN 1090-2 (Steel Structures) · Health and Safety at Work etc. Act 1974
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