HELICAL PULLDOWN MICROPILE
Ground Sun are approved installers of the Deep Foundation Solution from CHANCE
• Faster construction and best piling solution near trees
• Building on weak soil sites
• High-capacity applications
• Limited-access installation
• Underpinning foundations
• New construction foundations
• Authorised installation contractors are trained and certified by A.B. Chance
Benefits of this system include:
• Resistance to buckling in weak surface soils
• Stiffer pile (deflects less at a particular load)
• Additional corrosion protection in aggressive soils
What is a Helical Pulldown® Micropile?
The Helical Pulldown® Micropile is a system for constructing a grout column around the shaft of a standard Helical Foundation 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.
History of A.B. Chance in Civil Construction
Since 1912, A.B. Chance engineering research and development have advanced the unique advantages of helical anchors to meet today's construction challenges.
A.B. Chance is the world leader in screw anchor technology. Regardless of the application, Chance ®products and methods are efficient and predictable. They give a cost-effective alternatives to traditional construction foundations
Chance® helical anchors extend bearing plates into stable strata under soft, loose or expansive surface soils without significant disturbance.
Standard Applications of the Helical Screw Pile
Underpinning & New Construction Foundations for Extensions and Buildings
Retaining Wall Tieback Anchors
Pipeline Buoyancy Control Systems Substation Foundations
Transmission & Telecoms Tower Foundations
Standard Construction Equipment
installation of the micropile is completed quickly and easily with a hydraulic torque motor mounted on readily available equipment. Challenging sites, even with limited access, are overcome with the Helical Pulldown® Micropile.
Extensive Load Testing underpins the Chance Piles!
Helical Pulldown® Micropile: Tested to 205 tons
Helical Pulldown® Micropile extracted for visual inspection
Close-up of Helical Pulldown® Micropile extracted from clay soil
Cross-section of extracted micropile
The Helical Pulldown® Micropile also develops additional capacity by combining both end-bearing on the helical plates and skin friction along the rough surface of the grout column. The result is a higher capacity pile system.
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