Micropiles, also known as minipiles, pin piles, needle
piles, and root piles, are a deep foundation element constructed using high-strength,
small-diameter steel casing and/or threaded bars. Micropiles are generally 5 to
12 inches in diameter and can achieve capacities in excess of 300 tons within
bedrock. While these elements are largely utilized in compression, they can
also be used in a tension application, or a combination of both.Drilled
micropiles are utilized in situations where conventional spread footing and/or
driven pile foundation systems are either impractical or infeasible. These versatile deep foundation elements are frequently used in low headroom
situations, in areas of tight access, and in vibration-sensitive environments.
Micropiles also beneficial where the presence of
obstructions and/or rock make the use of driven piles cost-prohibitive. They
can be utilized for new construction as well as rehabilitation of old
foundations, and are also used in different earth support and underpinning
applications.
