Micropiles, also known as pin piles or minipiles, are small diameter, high capacity deep foundation elements. They can vary in diameter from 4 to 10 inches. Due to its minimal disturbance and small installation footprint they can be designed for both new construction and for existing structures.
Micropiles are installed by advancing a casing through the overburden material by flushing the cuttings with the aid of water or air. If applicable, once the casing has been advanced to rock, the designed rock socked is excavated utilizing a down-the-hole hammer. Once the excavation is complete, the reinforcing bar is placed and cement grout is pumped.