Deep foundation piling aids in transferring building loads further down into competent bearing strata. They are used for a variety of reasons, typically if there are large design loads, unfit soil at the shallower depths, or potential access restrictions at the site.
There are many shapes and sizes of foundation piling. Some examples are H-Pile and Pipe Pile. These foundation piles have many uses, two of which are pile foundation support and earth retention. Various equipment and technology allows piling to be driven, otherwise known as pile driving, even in low headroom conditions.