Benefits & Applications
Helical pulldown micropile systems have many benefits, but there are a few that set them apart from your other options. This CHANCE product comes with the advantages of increased capacity and corrosion resistance for long-term performance. The installation process itself actually enables grout to be pulled down around the helix as it is screwed into the soil. This speeds up the overall project and allows for greater strength.
Helical Pulldown Micropile Installation
Chance Helical Pulldown Micropiles are used to form a grout column around the shaft of a standard helical anchor/pile. The installation process can employ grout only or grout in combination with either steel or PVC casing. To start, a helical anchor/pile drives into the soil by applying torque to the shaft. The helical bearing plates require significant force or torque to advance the helical pile into the soil.
After the lead section containing helical plates penetrates the soil, a lead displacement plate and extension are placed onto the shaft. Torque is again applied on the assembly to advance the helical plates, which pulls the displacement plate downward, forcing soil outward and creating 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.