Drilled Micropiles

what are drilled micropiles?

Drilled Micropiles, commonly known as minipiles, are small-diameter, high-capacity deep foundation elements used to transfer structural loads through weak or unsuitable soils into competent soil or rock.

Micropiles are installed by drilling a casing typically 9.625-inches to 24-inches in diameter into the load bearing soil stratum. The casing is tremie grouted and a reinforcing center bar or cage is installed and sections of the casing is withdrawn to form a bond between the soil and the grout. Once the grout reaches the required strength, the completed micropile forms a reinforced, grouted foundation element capable of transferring structural loads into the surrounding ground.

what are the advantages of micropiles?

Drilled micropiles provide a versatile deep foundation solution where space, access, or subsurface conditions make conventional foundation systems difficult to install. Using compact drilling equipment, high-strength reinforcement, and cementitious grout, micropiles can develop substantial capacity within a small footprint while minimizing vibration and disruption. Depending on their design and configuration, micropiles can resist compression, tension, and lateral forces, making them useful for a variety of foundation and structural applications.