Micropiles are high-performance, high-capacity drilled deep foundation elements typically between 5–12 inches in diameter that
can extend to depths of 200 feet and achieve working loads of over 200 tons. Micropiles are comprised of high-strength steel casing, rebar and grout.
how they work:
Micropiles transfer the structural load through unsuitable soil layers to competent foundation soils. The loads are transferred from the foundation through the steel and grout of the micropile and shed to surrounding
rock or soil via high values of friction.
why you need them:
Micropiles are generally used when there are difficult ground conditions, such as natural or man-made
obstructions, sensitive ground with adjacent structures, limited access/low headroom and/or karstic
geology. They are commonly used to replace deteriorating foundation systems, for the renovation of
structures, to support structures affected by adjacent construction, for seismic retrofitting or in-situ
reinforcement including embankment, slope and landslide stabilization.