Tower Safety Rigging Lab
Trolley / Self Tagging Lift Simulator
Top pulley • travelling trolley pulley • Forces Are Not Hidden
NORMAL Calculated forces are below the entered WLL values.
TOP PULLEY — lbf
TRAVELLING TROLLEY — lbf
LOAD — lb
⚠ Forces Are Not Hidden
Moving the trolley outward increases supporting-line tension and creates a real inward self-tag force.
Moving the trolley outward increases supporting-line tension and creates a real inward self-tag force.
Inputs
Trolley Self TaggingResults
Blue • Yellow • Orange • RedAll forces are within the training threshold.
Dynamic Gross Load—
Dead-End Leg Tension—
Top-to-Trolley Tension—
Hoist-Line Tension—
Top-Pulley Resultant—
Travelling-Pulley Resultant—
Dead-End Reaction—
Self-Tag Inward Force—
Top Pulley Fx / Fy— / —
Load-Position Angle—°
Hoist-Line Angle—°
Maximum WLL Utilization—%
Wind Status—
Trolley / Self-Tagging Review
Free-body model: This lift has no separate tag rope. At an offset position, the two supporting legs create an inward horizontal self-tag force. The displayed position is an instantaneous moving-system geometry, not complete horizontal static equilibrium.Model assumptions: The top pulley and dead end are treated as colocated at the same elevation; the travelling pulley is at load elevation; the hoist is at ground level; friction is applied sequentially in the hauling direction. Rope weight, sag, shock loading, and wind force are excluded.
11.5.4 Wind Limitations: The nominal wind speed considered for standard load chart values is 30 mph at the elevation of the gin pole. This does not mean lifts can be, or shall be, conducted with wind speeds up to 30 mph. Other factors including specific site conditions, load control parameters, and the types of objects being lifted shall be considered when making this evaluation.
Above 30 mph: Lifts in nominal wind speeds above 30 mph shall be considered special engineered lifts in accordance with ANSI/TIA-322-A with applicable evaluation and special lift parameter conditions applied.
