Micropiles are deep foundation elements characterized by a diameter of 12 inches or less and a high steel to area ratio. Drilled and grouted in place, micropiles are classified by the FHWA as either directly loaded or indirectly loaded elements that can be constructed in a variety of different ways depending on the load requirements and the existing ground conditions.
Micropiles can be installed in almost any location, from crawl spaces beneath houses and small rooms to open job sites, low head room and in the bottom of caissons.
The two most common installation techniques are cased and uncased air flushed drilling or hollow bar grout flushed micropiles.
With individual pile capacities up to 300 kips, micropiles can be designed for axial loads in tension and/or compression. Piles can be battered to increase lateral loading requirements.
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Micropiles can be installed either in an open hole or with casing when ground conditions or structural loads require the additional strength. Micropiles can vary in capacity from a few tons to over 600 tons depending on geotechnical capacity.
Hollow bar Micropiles are rolled threaded pipe sections that allow for grout to be used as the flushing agent to remove drill spoils from the drill hole. Hollow Bar Micropiles are especially useful in ground conditions that have collapsing non-cohesive soils where the grout acts as a stabilizing agent to keep the drill hole open.
FSGC has extensive experience in the construction of Micropiles and works with licensed engineers to develop the best design for each application. With drilling capabilities from 4" to 12", FSGC has installed Micropiles with individual pile capacities of 20 kips to 300 kips.