Open Source Helical Piers Design Guide
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Composition
- Connector Fitting and pin
- Flighting
- Shaft
Shaft First Principle Calculations
- 2-7/8": Steel shaft at 2-7/8" diameter and .217 wall has about 1.8 sq in of area according to Area Calculator. J55 alloy at 55ksi means that ultimate compressive load with 0 margin of safety (see Factor of Safety) is about 100k lb.
- 2-3/8": Steel shaft at 2-3/8" diameter and .156 wall has about 1.1 sq in of area according to Area Calculator. J55 alloy at 55ksi means that ultimate compressive load is 60 klb.
- Safety factor of 4-6 [1] - 10-15 klb allowed load.