Method Statement – Heavy/Complex Precast Lifting, Crane Selection, Spreader Beams, Rigging Geometry, COG Verification, Exclusion Zones, and Tandem Lifts – Method Statement

Overview

This method statement defines the procedures and controls for planning and executing heavy or complex lifts of precast elements (e.g., wall panels, beams, bridge segments, staircase flights) using mobile/crawler cranes, spreader beams, and certified rigging. It includes single-crane critical lifts and tandem lifts requiring synchronized operations, communication protocols, and engineered lift plans.

Inclusions

• Engineering of crane selection and configuration (radius, boom, counterweight, outrigger/mat design)
• Ground bearing pressure assessment and crane mat design/verification
• Rigging design (spreader/lifting beams, slings, shackles), rigging angles and geometry
• Centre of Gravity (COG) determination and verification
• Precast lifting insert/padeye verification and concrete strength checks
• Exclusion/fall zone planning and control
• Pre-lift meetings, toolbox talks, and permit-to-lift process
• Trial lift, load-sharing checks, and controlled execution (including tandem lifts)
• Weather/wind controls, communication protocols, contingency and emergency procedures
• Inspection, testing, records, and quality control requirements

Exclusions

• Structural installation tolerances beyond lifting/placement unless specified
• Permanent works design outside the lifting phase

Definitions

• Critical Lift: Any tandem lift; or single-crane lift >75% of rated capacity at planned radius; or with exceptional risk/complexity [Verify per project HSE plan].
• Fall Zone: Area where load or crane components could fall if failure occurs [BS 7121 guidance; Verify per project].
• WLL: Working Load Limit of lifting accessories.
• LMI: Load Moment Indicator.

• Approved Lift Plan with calculations, rigging drawing, and sequence signed by Appointed Person and accepted by the Engineer [Verify per contract].
• Geotechnical verification of allowable ground bearing capacity and mat design approval.
• Utilities clearance: GPR/CAT scan and permits for work near buried/overhead services; minimum approach distances to powerlines per local law [Verify].
• Valid certificates for cranes, spreader beams, slings, shackles (thorough examination within 6–12 months per regulation [Verify]).
• Precast element data: verified weight (incl. tolerance/attachments), COG, lifting insert ratings, concrete compressive strength meet manufacturer requirement (typical 15–25 MPa prior to lift) [Verify].
• Weather forecast within limits for duration + contingency; wind thresholds defined in plan.
• Traffic and pedestrian management plan implemented; road closures approved if required.
• Emergency response plan and rescue arrangements briefed.
• Pre-start inspections completed: crane, rigging, mats, comms, anemometer calibration check.

Task-Specific Hazards and Controls

• Hazard: Crane overturning due to inadequate ground bearing
• Likely Consequence: Major injury/fatality, asset loss
• Engineering/Procedural Control: Geotechnical verification; mat design to limit GBPA ≤ allowable with FS ≥ 2.0 [Verify]; levelness ≤ 0.3°; daily mat inspection
• Required PPE: Hard hat with chin strap, safety boots, high-vis, gloves
• Collective Measure: Exclusion zone around crane and outriggers; edge protection at excavations

• Inspection/Permit/Supervision: Hold point on mat design approval; daily crane pre-use check; Lift Supervisor sign-off

• Hazard: Contact with overhead powerlines

• Likely Consequence: Electrocution, arc flash
• Engineering/Procedural Control: Survey and define approach limits; de-energize or install physical barriers/baffles; dedicated spotter for clearances
• Required PPE: Dielectric gloves if required, arc-rated clothing where applicable [Verify]
• Collective Measure: Physical barriers and signage at no-go zones

• Inspection/Permit/Supervision: Permit-to-work near services; utility owner coordination; HSE oversight

• Hazard: Load drop or rigging failure

• Likely Consequence: Fatality, property damage
• Engineering/Procedural Control: Certified rigging; WLL verification incl. sling angle factors; NDT on padeyes if specified; trial lift 100–200 mm; no personnel under suspended loads
• Required PPE: Hard hat with chin strap, safety boots, gloves, eye protection
• Collective Measure: Exclusion zone covering fall path; taglines for control

• Inspection/Permit/Supervision: Rigging inspection hold point; sling register; appointed person approval

• Hazard: Tandem lift synchronization failure

• Likely Consequence: Unbalanced loading, overload, structural damage
• Engineering/Procedural Control: Defined load-share; load cells; single lead crane and single signaler; rehearsed commands; planned speed limits
• Required PPE: As above, plus radios/headsets
• Collective Measure: Restricted access; raised supervisor platform for visibility if needed

• Inspection/Permit/Supervision: Witness point at trial lift; continuous monitoring of load-share; stop-work authority

• Hazard: Wind-induced load swing or sail effect on large panels

• Likely Consequence: Collision, instability, overload
• Engineering/Procedural Control: Wind thresholds set (typ. 9–10 m/s for large panels; lower for gusty conditions) [Verify]; anemometer at height; postpone if exceeded; use taglines/secondary support if required
• Required PPE: As standard; eye protection
• Collective Measure: Wind socks; wind alarms

• Inspection/Permit/Supervision: Weather log; Supervisor authorization to proceed

• Hazard: Struck-by during slewing/limited visibility

• Likely Consequence: Serious injury
• Engineering/Procedural Control: Banksman controls; defined path; blind lift protocol; cameras where available; night lighting plan
• Required PPE: High-vis, helmet, gloves; hearing protection if >85 dB(A)
• Collective Measure: Barriers, lighting towers, spotters

• Inspection/Permit/Supervision: Night work permit; lighting lux checks [Verify]

• Hazard: Pinch/crush points during rigging attachment/removal

• Likely Consequence: Hand injuries
• Engineering/Procedural Control: Taglines; keep hands clear of bights; torque-controlled pins; use tools not fingers
• Required PPE: Cut-resistant gloves, eye protection
• Collective Measure: Work positioning to avoid trapping; non-slip access

• Inspection/Permit/Supervision: Supervisor verification during attachment/removal

• Hazard: Communication failure

• Likely Consequence: Conflicting movements, collision
• Engineering/Procedural Control: Radio check; dedicated channel; backup hand signals; single signaler; communication script for tandem lifts
• Required PPE: Radios/headsets
• Collective Measure: Noise management; clear line-of-sight where possible
• Inspection/Permit/Supervision: Comms test recorded; Lift Supervisor oversight

[Verify per project HSE plan and local regulations].

• Noise and Vibration: Schedule heavy lifts in daytime where possible; use broadband alarms; maintain equipment to reduce noise; provide hearing protection zones; monitor if near receptors [Verify].
• Air Emissions: Maintain cranes to reduce exhaust; avoid prolonged idling; consider Stage V/Tier 4 equipment where feasible.
• Ground/Water Protection: Drip trays under hydraulic connections; spill kits at crane; refuel in designated areas; mats to prevent soil rutting; no storage in drainage lines.
• Waste Management: Collect damaged slings/hardware for proper disposal; recycle packaging; segregate waste streams as per site plan.
• Dust/Soiling: Clean access routes; wheel wash if required; cover stockpiles.
• Light Pollution (night lifts): Directional, shielded lighting; avoid light spill to neighbors; monitor lux levels [Verify].
• Wildlife/Vegetation: Avoid lifting over protected habitats where practicable; implement buffer zones.
• Weather: Cease operations during storms/heavy rain that may soften ground; re-verify GBPA after significant precipitation.

QA/QC Controls

• Documentation Control: Approved lift plan, rigging drawings, load charts, mat design, permits, and risk assessments available on site.
• Certifications: Cranes, spreaders, slings, shackles with current thorough examination and calibration certificates (load cells, anemometer) — typically within 6–12 months [Verify].
• Precast Verification: Supplier weight sheet; COG confirmation; compressive strength evidence per lifter manufacturer (typ. 15–25 MPa before lift) [Verify]; visual check for cracks at lifting points.
• Rigging Geometry: Confirm sling angles per drawing; record actual angles if deviating; apply sling angle factor to WLL when angle <60°.
• Ground Bearing: Signed calculation and inspection record; levelness measured and recorded (≤0.3°).
• Trial Lift: Record load-share readings; accept only if within ±10% planned; adjust rigging and repeat if outside tolerance.
• Weather: Wind log maintained; stop criteria captured.
• LMI/Limiters: Function tests recorded at start of shift; no bypassing permitted.
• Non-Conformance: Record NCRs for deviations; corrective actions before proceeding.
• Records Retention: Maintain in project QA system for duration per contract (e.g., 10 years) [Verify].

• Approved Lift Plan and Rigging Drawing (with sling angle calculations and spreader beam selection)
• Crane Load Charts for specific configuration (boom length, counterweight, radius)
• Ground Bearing Pressure calculations and Crane Mat design/approval
• Precast element data: weight sheets, COG, lifting insert/padeye certificates and any NDT
• Inspection certificates: cranes, slings, shackles, spreader beams; calibration certs (load cells, anemometer)
• Permits: Permit-to-Lift, services permits, traffic management approvals, night work permits (if applicable)
• Risk Assessment/Method Statement (RAMS) and Emergency Plan
• Toolbox Talk attendance records and Communication protocol sheet
• Weather logs, trial lift logs, load-share records
• As-placed survey checks and close-out report