A resistance pier system is comprised of a two-piece system consisting of a pier head assembly/foundation repair bracket that is attached to an existing structural foundation, which in turn is mounted to a tubular steel pier that is hydraulically pushed to a rigid bearing stratum (clay or sand) or a bedrock layer using the dead weight of the structure and soil overburden, if available. The system develops compressive capacity via end-bearing due to a friction reduction collar that is fabricated on the leading edge of the tubular pier. The resistance pier is installed in a two-stage approach, with the first stage comprised f the pier pipe shaft being driven to a firm bearing stratum and then tested to a force greater than the force required to lift the structure. The second stage involves the lifting/restoration of the structure via a manifold system. This two-stage approach effectively loads each pier prior to lift and provides a measured factor of safety on each pier installation. A typical detail for a resistance pier system is presented in Figure 3.

Resistance pier Benefits

• Ultimate capacities up to 99,000 lb.
• Field test loads up to 74,000 lb
• Standard lift 4” fully adjustable
• Installs from outside or inside the structure
• Installs with portable hydraulic equipment
• Install with little or no vibration
• 100% of piers are field load tested to verify capacity during installation
• 10 year warranty

Foundation Settlement before Installing Piers	Foundation Settlement after Installing Piers