The greater the number of lifting points on a structure, the harder it becomes to ensure force distribution on the slings while maintaining structural integrity.
CHALLENGES
🔸 Five modules with varying dimensions and weights, each weighing up to 30 tons
🔸 Need to optimize the design of the spreader bars
🔸 Structures with up to 10 lifting points
🔸 Limited lifting height due to transport constraints
🔸 No space for stabilizing near the final position
SOLUTIONS
🔸 Use of two spreader bars with appropriate geometry and capacity to lift all five modules
🔸 Use of special (but simple) devices to improve force distribution among the sling legs
🔸 Non-linear structural analysis to account for variations in forces at lifting points
🔸 Use of a 500-ton crane due to the inability to stabilize near the assembly area
SCOPE of FMetal Engineering and Consulting and TechCon Engineering and Consulting
🔸 Structural verification of the modules during lifting operations
🔸 Verification of the lifting points
🔸 Structural design of the spreader bars
🔸 Design of force distribution devices for the slings
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Although everything works well, this lifting method, using a single frame-type spreader bar, is not the most optimized, as it requires a very robust structure for both the spreader bar and the load.
A better approach is to use three spreader bars and 14 sling legs, achieving better force distribution at the lifting points.
