Rope access anchor distance calculator
This calculator is intended as a general reference guide to estimate recommended spacing for a pair of rope access anchors on a roof, aligning with industry-advised parameters.
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The final anchor system design must be conducted by a qualified professional. They should perform a comprehensive assessment of the specific work tasks and carefully plan the strategic placement of anchors to effectively mitigate risks.
Anticipated load vectors and potential force multipliers must be thoroughly analysed to ensure the anchor layout provides adequate safety factors.
The diagram provides details of the the below parameters:
AS: Anchor Spacing
AED: Anchor Edge Distance
SF: Swing Factor
YHA: Y Hang Angle from centre line
The diagram below is an indicative representation of the angle and values.
Calculations
- Distance between anchors (AS)
- 800 mm
This denotes the advised installation spacing between two rope access anchors. Site conditions and parameters may vary. Consultation with qualified individuals for accurate determination may be required.
- Swing factor (SF)
- null mm
Swing factor refers to the distance of swing a technician will encounter if one anchor or the rope should fail. Any swing factor over 1500mm is considered an uncontrolled swing.
- Half angle between the Y-hang (YHA)
- null degrees
The half angle between the Y-hang is calculated from the Anchor Edge Distance (AED) and Distance between anchors (AS). There is a recommended range of 15 to 45 degrees between the Y-hang projected load line. This will account for a total Y-hang angle from 30 to 90 degrees.
- Anchor Edge Distance (AED)
- 600 mm
The anchor edge distance is the measurement from the intended anchor placement to the edge of the building or where the knot in the rope will be positioned for the intended drop zone.
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