Drilled shafts are large diameter bored, cast-in-place composite elements in which the applied loads are resisted by a rebar cage, concrete, and a combination of end bearing and friction forces. Drilled shafts can support very high axial and lateral loads. A variety of installation methods such as slurry or casing are used depending on the geotechnical conditions encountered. The equipment for drilled shafts usually requires unrestricted headroom and a large site footprint, although Phoenix can successfully install drilled shafts in a low-headroom configuration when site conditions warrant (see picture below).
Typical Applications for Drilled Shafts