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 2: 30k lb.

Links

Open Source Helical Piers

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