EagleLIFT has over 25 years of experience in lifting and stabilizing buildings using helical piles. Helical piles are not often included as regular curriculum for structural or geotechnical engineers and therefore expertise in helical piles is considered niche; Universal guidelines are available but not always utilized which results in manufacturers relying on proprietary data which often lacks testing in a wide range of soils conditions (this is avoided when insisting on universally accepted engineering principles for helical piles); The existence of other variations of screw piles, such as augered or duckbill piles, ground anchors and ground screws add confusion to the market, these piles lack standard design and universal engineering principles do not exist or apply to these similar but very different types of screw piles; Helical piles are not a viable option when there is shallow refusal (impenetrable very dense strata) at or before 1.5 meters from grade; The predictability of torque and capacity when installing in boulders is lowered, load testing would be required in this situation; Performance may be greatly influenced by the ethics of the helical pile contractor, their experience, technical knowledge/engineering pedigree and equipment utilized; Helical piles have smaller shafts compared to other pile options resulting in lower resistance to lateral and/or bending forces (this can be overcome with various strategies including pile caps, larger shafts near surface, grillages or battered resistance piles); When pile must be installed through very dense layers to achieve desired install depths, helical piles may need to be constructed more robustly to resist the installation torques or predrilling may be required; Require quality mill grade steel and certified welds; and. endobj In the early 1900s nearly all deep foundation options required a lot of labour to install and helical piles were no exception. These piles are the newest emerging product and have gained significant popularity over the last ten years. }, Helical Piers Installation Example of installing high capacity helical piles to satisfy 1,000kN, information on structural engineering basics, Structural Engineering Basics Online Program. 3 0 obj Estimation of uplift capacity of helical anchors in clays. Deep penetrating helical piers can be used to support foundations in new construction projects. FAQ The lead has multiple helical blades, also referred to as helical bearing plates, that can vary in size, shape, and number. Fig 2: Compression failure modes (Perko 2009). Foundations, Structural Engineering Basics, Structural Enginerring Projects.

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