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Saw a rigger choke a 4-leg sling at 60 degrees and call it good, that's a 1.7x multiplier not 1.4
Last Tuesday on a tilt-up job outside Reno, a guy from another crew slung a 9,000 lb panel with four legs at roughly 60 degrees off horizontal, then said "four legs, so each one takes a quarter of the load, easy money." I grabbed the tag and showed him the chart: at 60 degrees each leg pulls 0.58 of the load, which is about 1.73 times a straight vertical pick. He wrote it off as me being fussy until the lift director made us re-sling with two legs and a spreader bar. The real trap is the two-leg formula guys half-remember from a card they saw once in 2015. If you read the load off a leg angle chart and not the side of the sling tag, you're guessing with other people underneath. What angle do you all call the cutoff before you swap to a spreader?
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parker9382d ago
Man, 45 degrees is where I quit playing and grab the spreader. Anything past that and the leg tension starts climbing way faster than guys expect. Good on you for catching it before somebody got hurt.
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