GROUTED PULLDOWN MICROPILES
The Helical Pulldown Micropile (HPM) is used to form a grout column around the shaft of a standard helical anchor/pile. The installation process can employ grout only (see Uncased Helical Pulldown Micropile) or grout in combination with either steel or PVC casing (see Cased Helical Pulldown Micropile).
|Helical Pulldown Micropile Brochure
To begin the process, a AB Chance helical anchor/pile is placed into the soil by applying torque to the shaft. The helical shape of the bearing plates creates a significant force that keeps the foundation advancing into the soil. After the Lead Section with the helical plates penetrates the soil, a Lead Displacement Plate and Extension are placed onto the shaft. Resuming torque on the assembly 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 the shaft. Additional extensions and displacement plates are added until the helical bearing plates reach the minimum depth required or competent load-bearing soil. This displacement pile system does not require removing spoils from the site. It's considered an economical deep foundation solution.
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