Before you select a single shackle, you must know exactly what you are lifting. For objects with unknown weights, follow these three steps:
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[ Crane Superstructure ] || || (Total Downward Force) \/ ================== <-- Crane Outrigger Pad ================== <-- Cribbing / Mats ------------------------ | Soil / Subgrade | <-- Ground Bearing Pressure (GBP) ------------------------ Outrigger Load Distribution rigging engineering calculations pdf free download
T=WN×LAFcap T equals the fraction with numerator cap W and denominator cap N end-fraction cross LAF
Never use a sling angle lower than 30 degrees from the horizontal. Low angles drastically multiply sling tension, risking sudden failure. Before you select a single shackle, you must
While commercial engineering software automates these formulas, having reference handbooks, charts, and PDF calculation sheets on your device is invaluable for field verification.
: Detailed instruction on rigging forces, lift systems, and synthetic rope. BNL Basic Rigging Workbook Lifting an object safely requires placing the crane
A crane's lifting capacity drops as the radius (distance from the crane center pin to the load) increases.
Lifting an object safely requires placing the crane hook directly over the Center of Gravity. If the CG is offset, unequal weight distributes to the rigging points.
To find the load placed on an individual sling, you must multiply the shared weight by the Sling Angle Factor. The SAF is calculated using the sine of the horizontal lift angle: