Jacked in piles or piers are constructed using small-diameter steel pipes advanced to bearing depth by hydraulic jacks that are secured to the existing structure being underpinned.
Using the structure as the reaction load, a hydraulic ram is used to push a 3.5 ft section of steel casing into the ground. This method essentially load tests each pile, as we are monitoring the pressure/resistance needed to install the casing. This installation resistance directly correlates to the pile capacity. After reaching bearing depth, the tops of the pipes are bracketed to the structure’s footing, filled with grout and locked-off to a specified percentage of the design load.
Keller's extensive jacked in pile installation and design experience allows for custom connections to the existing structure based on the site specific logistics eg grade beams, pile caps, structural slabs.