Helical Pulldown Micropiles (Combination Piles)
Our clients searching for foundation solutions can expect the most cost-effective methods with Pier Masters. Higher load capacities than ever are now achievable by the patented helical pulldown® micropile technology. It continues to overcome obstacles to traditional foundation methods for a growing number of applications.
The helical pulldown® micropile is a system for constructing a grout column around the shaft of a standard helical pier foundation system pile.
To begin the process, a screw anchor is placed into the soil by applying torque to the shaft. The helical shape of the bearing plates creates a tremendous pulling force that keeps the anchor advancing downward into the soil. After the lead section with the helical plates penetrates the soil, a lead displacement plate and extension are bolted onto the shaft. Resuming torque on the assembled shaft advances the helical plates and pulls the displacement plate downward, forcing soil outward to create a cylindrical void around the shaft. From a reservoir at the surface, a flowable grout immediately fills this void, surrounding and encapsulating the shaft. Additional extensions and displacement plates are added until the helical bearing plates reach competent load-bearing soil. This displacement pile system does not require removing spoils from the site. It also has the added benefits of resistance to buckling in weak surface soils, stiffer pile and additional corrosion protection against aggressive soils.
Placed as composite steel and concrete pilings, the micropiles have advantages of:
no vibration to adjacent buildings; all components can be individually designed; pre-engineered system; dedicated equipment is not required; predictable and reliable capacities; cost-effectiveness (especially viewed as dollars per completed job).
Learn about Pier Masters’ expertise with regard to foundation settlement repairs.
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