Helical piers or piles are installed by being twisted into the soil, just like a corkscrew is twisted into a bottle of wine. In many cases, the steel pile itself is enough to meet the load requirements of the project. However, for more robust deep foundation systems, concrete (also known as grout) can be incorporated.
Helical piers are made of galvanized steel to prevent rusting. They are generally estimated to last over a hundred and twenty years. However, this might be shorter or longer depending on the soil conditions.