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Foundation Settlement » Combination Piles

The Combination Pile is used mainly in compression applications in areas where soft/loose soils are located above the bearing strata (hard/dense soils) for the helices. The material with a much greater section modulus will resist columnar buckling in the soft/loose soil.

Grouted Helical Piers - HPM's

HELICAL PULLDOWN® Micropile

Higher load capacities than ever now are achievable by the patented HELICAL PULLDOWN® Micropile technology. It continues to overcome obstacles to traditional foundation methods for a growing number of applications. 

These products serve heavy anchoring markets with tension loads of 70,000 lbs to 200,000 lbs and compression loads of 20,000
to 400,000 lbs.

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 Pier Foundation Systems 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.

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 

Advantages:

Placed as composite steel and concrete pilings they have advantages of:

No vibration to adjacent buildings 
All components can be individually designed 
Pre-engineered system 
Dedicated equipment NOT required 
Predictable and reliable capacities 
Cost effectiveness (especially viewed as dollars per completed job)

For More Information:
New Construction
Tower Foundations
Telecom Structure Support - Bulletin 02-0101 
CAD Drawings 
Case Studies

Drilled Steel Piers

We are currently working to bring you more information about Drilled Steel Piers.