From a foundation optimization standpoint, driven-pile foundations are appealing because they generally offer the most attractive price point while providing good lateral and vertical bearing. Driven piles are most appropriate where soils are firm and compacted, with enough fine-grain materials (silt or clay) to offer high skin friction. Softer soils require deeper embedment depths and larger cross-sectional profiles. Driven piles are problematic in soils that resist installation, such as soils with very coarse gravel or rock fragments, very hard soils or bedrock.
Andrew Worden, CEO of GameChange Racking, notes that installers have three options when a site refuses a pile: “One option is to conduct a pull test to see if the driven pile has sufficient pull-out resistance as it is installed, in which case you can cut the pile to the desired height and use it. A second option is to remove the pile and reinstall it nearby, provided that the mounting-system tolerances allow for this. The third option is to remove the pile, drill an oversized hole, insert the pile into the hole and use cement, as detailed by a structural engineer, to grout the pile in place.” Steel piles are available in a wide variety of profiles, providing design flexibility. Options for pile driving equipment provide installation flexibility. Worden elaborates: “Some of these machines are highly sophisticated—with GPS guidance and automated installation technology—and allow for a very low pile-installation cost, considerably below that of other foundations.” However, equipment access limitations typically constrain driven pile foundations to slopes less than 15°.#soiltesting #solarstation #solar #solarsystem #solarenergy #solarpower #solarpv #solarpowered #energiasolar #sistemasolar #fotovaltaica #gosolar #environment