Helical piers may work well as would drilled and poured concrete piers. Both have advantes and dissadvantges.
It seem to me the issue with piers leaves more questions that need to be answered. What do the core samples reveal? Will the drilled shaft require casing? Is a concrete pump truck...
The information you are looking for is
Helix Pier Engineering Handbook 2000
By Howard A. Perko
you may be able to find this on the web.
We also build and install helix tube piers.fyi.
Piers can be fabricated with varied structural pipe diameters and wall thickness to addres torque and lateral load. Then have them galvanized we pay about 14c per pound. You can build them in sizes up to 20' lead section. These piers when designed by an engineer are not proprietary and are...
