Pressed Pier Method
Piling or piering is the technique of driving steel pipe pilings to save failing building foundations and to correct foundation settlement.
Push piers consist of sections of galvanized or epoxy-coated steel pipe that are driven into the soil with a hydraulic ram.
Helical piers use screw piles with steel shafts. The lead section, with one or more helixes attached, provides the needed bearing capacity. The piers are screwed into the ground with a hydraulic torque motor.
With either system, one or more steel piers are driven to rock or a suitable soil bearing layer and are connected to the foundation through a metal head assembly. Once a suitable bearing stratum is reached, each pile is tested to a force greater then required to support the structure.
Hydraulic jacks attach to the embedded steel piers and are used to raise the foundation back to its original elevation. Once the structure is restored to the desired elevation the piles are affixed (bolted or welded) to wall brackets, locking the new elevation of the structure.
Piers also offer an affordable solution for decks, porches, patios, hot tubs as well as pre-fab buildings.
Advantages of Piers on Concrete Foundations
Learn the benefits of repairing a foundation with piers
The benefits of using piers to repair a foundation are as follows:
- Low cost. Up to ten times less than replacing the building foundation.
- No disruption or loss of use of the dwelling. The repair is performed with the building being used as normal.
- The equipment is portable and can be easily used in tight spaces or carried by hand where access is a problem.
- Remedies both the cause of the settlement (unstable soil) and the consequences (dwelling out of level) in one step.
- No yard destruction
- No heavy equipment
The typical steps for using piers to fix a foundation
The steps in the piering process are as follows:
- A 3'x4' excavation is made adjacent to foundation and approximately 10" below the grade beam.
- Soil is scrapped from the footing bottom and the foundation is chipped smooth to ensure proper fit of support bracket.
- Brackets and hydraulics are installed and a guide sleeve is advanced through the support bracket.
- Starter and pier sections are advanced to refusal at an average penetrating power of 50,000 pounds of total driving force.
- The last pier section is cut approximately 5" above the support bracket and a fastening plate is installed on top of the pier column.
- The hydraulics are reconnected and are operated sequentially to raise the structure.
- When the structure has been raised to the desired height the fastening plates and support bracket are permanently attached to the pier column.