For those not in construction, ASME B30.5-3.2.1.5 (i) states:īlocking under outrigger floats, when required, shall meet the following requirements: Nowhere in OSHA does it say that you will be ok if you use the rule of thumb for cribbing, instead in 1926.1402 OSHA states: that cranes must be assembled on ground that is firm, drained and graded sufficiently, in conjunction with supporting materials, such as blocking, cribbing, pads, or mats, to provide adequate support and levelness. We hate to break it to you, but there are NO safe rules of thumb when it comes to cribbing. “I just use the pads that come with the crane, surely that is enough.” “There are no rules, I just stick whatever I have on hand underneath the pad,” “Who cares what size the float is? I go with the crane capacity divided by 5.” “I’ve always used 4x times the float… better be safe than sorry.” “Well I’ve heard it has to be 3x the outrigger float.”
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