Minipiles are a deep foundation element constructed using high-strength, small-diameter steel casing and/or threaded bars.
The casing, with a diameter generally in the range of 200-600mm is advanced to the design depth using a drilling technique.
Reinforcing steel, typically an all-thread bar, is inserted into the minipile casing and high-strength cement grout pumped in. The casing may extend to the full depth or end above the bond zone with the reinforcing bar extending to the full depth.
Capacities vary depending on the minipile diameter and subsurface profile but compressive capacities of more than 1000kN have been achieved.
Keller has vast load test experience in various rock formations and the ability to design in-house based on various subsurface conditions.