Helical Pier Foundation: Difference between revisions
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*This article says $150-250 per house pile - [https://www.deckmagazine.com/design-construction/footings/helical-pile-deck-foundations_o#:~:text=Many%20contractors%20assume%20that%20helical,the%20pile%20to%20the%20structure.] | *This article says $150-250 per house pile - [https://www.deckmagazine.com/design-construction/footings/helical-pile-deck-foundations_o#:~:text=Many%20contractors%20assume%20that%20helical,the%20pile%20to%20the%20structure.] | ||
*Average cost of a 20' helical pile - - around $700 - [https://helicalpileworld.com/average_helical_pile_prices_installed_helicalpileworld.html] | *Average cost of a 20' helical pile - - around $700-1400. [https://helicalpileworld.com/average_helical_pile_prices_installed_helicalpileworld.html] | ||
=Examples= | =Examples= | ||
Revision as of 23:52, 15 July 2020
Intro
Helical piers are essentially augers stuck into the ground, which serve as a foundation.
Basic Calculations
Take a 3" helical pier that can hold 12,000 lb/sf on rock or 1500 lb/sf on soft clay, with a safety factor of 2 [1].
- 7000 ft lb torque for screwing 8" diameter helix in [2]
- note that if the pier has 2 helices, that doubles the load bearing capacity! You can stack the helices, but need enough space between the helices.
- Helix is .217" pipe, 3" diameter. Steel Weight Calculator sez it's 6.5 lb/ft. Nice! Helix can be 3D printed with WAAM at $1/lb.
- Thus, the piers are quite affordable. The helix and couplers will be the hard part, that's where WAAM comes in.
Cost
- This article says $150-250 per house pile - [3]
- Average cost of a 20' helical pile - - around $700-1400. [4]
Examples