How the PermaJack System Works:
- An excavation is made adjacent to the foundation and enough dirt is removed so that the Perma Jack Bracket can be placed under the foundation.
- The "L-shaped" bracket is then permanently bolted under the foundation. Using pipe sections, a pile is then formed and placed through the bracket. These pipe support columns are aligned and tightly connected together by column connectors to form a pile.
- Hydraulic pressure is then applied to force the pile into the ground until it hits bedrock or equal load bearing strata. The hydraulic equipment that is used for this operation is capable of load testing each pile to a capacity of 24,000 lbs. - yet it operates quietly at a maximum of 75 decibels.
- The pipe support columns are then connected and forced into the soil to form a sturdy, stable steel pile reaching as deep as necessary to contact solid bedrock or equal load bearing strata. The competency of the bearing material is verified by the very nature of the tested installation where each pile is tested. The mass of the structure is used as a reaction to drive the pile to refusal.
How the Foundation is Leveled and Stabilized:
- The hydraulic cylinder is then used to lift and level the foundation and structure.
- Once the pipe pile is loaded, it is locked off with high strength bolts.
- After rebar is inserted in the pipe column, the column is filled with grout and the soil is then backfilled. In general, average pile depths range from 20 to 30 feet, but in some locations, Perma Jacks have been driven to 125 feet depending upon soil conditions.
Valentine's Perma Jack crews install multiple Perma Jacks to stabilize a settling grade beam foundation of a Fremont commercial building. Notice the minimal construction disturbance to the owner & occupants.