helical plates welded to the pile shaft. Extension A pile section without helical plates. Extension(s) are installed after the lead section. Each extension is connected with integral couplings which provide a rigid load transferring connection. Their purpose is to extend the lead section with helical plates to a load bearing stratum. GUIDE TO MODEL SPECIFICATION CHANCE Civil For purposes of this Model Specification, the subject is a high capacity Helical Pile manufactured by CHANCE® Civil Construction. At present, maximum working or design loads range between 12.5 and 50 tons. The Helical Pile consists of one or more helical bearing plates attached at the tip of a high strength central steel shaft.
Before installation, a helical anchor/pile is simply a screw with a discontinuous thread and a uniform pitch. When installed into soil, a helical anchor/pile functions as an axially loaded end-bearing deep foundation. The helix plates serve a two-fold purpose. The first purpose is to provide the means to install the helical anchor/pile. Helical Piles - Complete Basement SystemsHelical piles are a factory-manufactured steel foundation system consisting of a central shaft with one or more helix-shaped bearing plates, commonly referred to as blades or flights, welded to the lead section. Extension shafts, with or without additional helix blades, are used to extend the pile to competent load-bearing soils and to achieve Helical Piles - What an Engineer Needs to Know - Articles A helical foundation consists of at least one helix-shaped steel bearing plate attached to a central steel shaft. The shaft is typically solid steel bar (12 to 23 inches square) or heavy wall pipe (2f to 8 inches in diameter). The helix plates are high-strength steel (6 to 16 inches in diameter, d or 2 inch thick).
First, a helical anchor/pile is placed into the soil by applying torque to the shaft. The helical shape of the bearing plates creates a significant downward 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. Home ~ helicalsalesTypes of Helical Piles. Helical piles are available square or round shaft configurations. The square shaft anchors are available in 1.25, 1.5, and 1.75 with 8, 10 or 12 helices. These are commonly used in uplifting/tension applications. Type SS175 Helical Piles and AnchorsCHANCE Type SS Helical Piles and Anchors feature sharpened leading edge helix plates that are circular in plan to provide uniform load bearing in most soil conditions. Helix plates can be equipped with sea-shell cuts on the leading edge to enhance penetration through dense soils
Most helical piles are round hollow shafts or square solid shafts, extruded from steel and come in a wide variety of diameters and gauges, to serve different types of projects. One or more steel screw threads (or helical bearing plates) welded onto the shaft, in order to supply ample downforce to the soil as its being screwed into the earth.Helical Piles GeoengineerHelical pile capacity in clays is optimized when the bearing plates are spaced 1.0 to 1.5 plate diameters apart along the shaft (Prasad and Rao 1996). If the plate spacing to plate diameter is greater than 1.5, the failure surface of the soil between plates in uplift is no longer cylindrical, which is correlated with uplift capacity (Prasad and Rao 1993).