# System. Stability. Security. Integrity. 150 Helical Anchor

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1 Model 150 HELICAL ANCHOR System PN #MBHAT Stability. Security. Integrity. 150 Helical Anchor System

4 General Information DETERMINATION OF CAPACITY The ultimate capacity of a helical anchor may be calculated using the traditional bearing capacity equation: = [A h (cn c + qn q Where = Ultimate Anchor Capacity (lb) A h = Area of Individual Helix Plate (ft 2 ) c = Effective Soil Cohesion (lb/ft 2 ) N c = Dimensionless Bearing Capacity Factor = 9 q = Effective Vertical Overburden Pressure (lb/ft 2 ) N q = Dimensionless Bearing Capacity Factor Total stress parameters should be used for short-term and transient load applications and effective stress parameters should be used for long-term, permanent load applications. A factor of safety of 2 is typically used to determine the allowable soil bearing capacity, especially if torque is monitored during the helical anchor installation. *Like other deep foundation alternatives, there are many factors to be considered in designing a helical anchor foundation. Foundation Supportworks recommends that helical anchor design be completed by an experienced geotechnical engineer or other qualified professional. Another well-documented and accepted method for estimating helical anchor capacity is by correlation to installation torque. In simple terms, the torsional resistance generated during helical anchor installation is a measure of soil shear strength and can be related to the bearing capacity of the anchor. = KT Where = Ultimate Anchor Capacity (lb) K = Capacity to Torque Ratio (ft -1 ) T = Installation Torque (ft-lb) The capacity to torque ratio is not a constant and varies with soil conditions and the size of the anchor shaft. Load testing using the proposed helical anchor and helix blade configuration is the best way to determine project-specific K-values. However, ICC-ES AC358 provides default K-values for varying anchor shaft sizes, which may be used conservatively for most soil conditions. The default value for the Model 150 Helical Anchor System (1.50 square shaft) is K = 10 ft AREA OF HELIX BLADES Helix Diameter (inches) Helix Area (ft 2 )

5 General Information anchor CAPACITY The cross section of a square shaft is very compact which can allow the anchor to penetrate more easily through the soil. This compact shape also reduces the stiffness of the cross section and introduces more potential for buckling. These two factors make square shaft helical anchors better suited for tension loads. Foundation Supportworks, Inc. therefore recommends their use mainly for these types of applications. Square shaft helical anchors (piles) used in compression should be evaluated on a case by case basis by the project engineer. Mechanical Axial Capacity (see note): Allowable Tension = 26.5 kips* technical specifications Outer Dimensions = 1.50 x 1.50 Anchor Shaft Yield Strength = 90 ksi (min.) Coupling Hardware: Ø ¾ Grade 8 Bolt with Nut Available Helix Blade Diameters = 6, 8, 10, 12 and 14 Helix Blade Thickness = Termination Hardware: Ø1 Threaded Rod, Tensile Strength = 120 ksi (min.) *The mechanical tensile capacity of the Model 150 Helical Anchor System is limited by the allowable stress levels dictated by AISC for a high strength bolt in double shear. The allowable tensile capacity of the shaft is actually much higher than this Allowable Tension value. Torque Limited Axial Design Capacities based on Ultimate Torsional Resistance of Anchor Shaft = 6,340 ft-lbs**: Ultimate Soil Capacity = 63.4 kips** (with K = 10 ft -1, see note) Allowable Soil Capacity = 31.7 kips (FOS = 2, Allowable System Capacity therefore governed by mechanical capacity = 26.5 kips*) **This Ultimate Torsional Resistance and its corresponding Torque Limited Capacities are based on laboratory test results from an IAS accredited facility and may only be approached in idealized conditions. Plastic torsional deformations can begin in the anchor shaft near 4,600 ft-lbs. This value may be reached and exceeded in the field by maintaining alignment between the anchor and the drive head, limiting impact forces and torque reversal, and reducing the tendency to crowd (push down on) the anchor. Installation through soils with obstructions or high variability may result in impact loading on the anchor. In these cases, achieving high torque values becomes more difficult and a further reduction in the Design Torque Limit may be appropriate. note K = 10 ft -1 is a default value as published in ICC-ES AC358 which can, in many cases, be considered conservative. Higher capacities can often be achieved with site-specific load testing. Allowable capacities based on site testing shall not exceed the Mechanical Axial Capacity. coupling detail The extensions for the Model 150 Helical Anchor System are manufactured with forged, upset ends that are drilled to create a socket and bolt coupling. Direct, sufficient contact of the anchor shaft is much more difficult to achieve within upset couplings than couplings for shafts with machine cut ends. The coupling bolt then acts in double shear for both tension and compression applications. Since FSI recommends that square shaft anchors be used mainly to resist tension loads, this level of precision is not justified. 5

6 applications 2009 Foundation Supportworks The Model 150 Helical Anchor System provides lateral stability to foundation walls and retaining walls with unbalanced earth pressures. Helical anchors can be installed with hand-held equipment, mini-excavators, skid steers, backhoes, trackhoes, or crane-supported rigs so the installation equipment can be sized for the project. Model 150 Helical Anchor System advantages Predictable capacity Helix blade configuration selected to achieve design embedment and capacity All-weather installation Can be installed in areas of limited or tight access Installation does not generate spoils Clean installation with no messy grout Load tests can be performed immediately following installation Available with optional hot-dip galvanizing for added corrosion protection 6

7 applications 2009 Foundation Supportworks Foundation Supportworks recommends that all helical anchors be pre-tensioned following installation. Pre-tensioning to the design load minimizes deflection of the anchors and structure as the anchors are put into service. Anchors can also be pull tested or load tested to typically two (2) times the design load or more to identify the ultimate system capacity, better assess soil conditions and soil/anchor interaction, and validate design procedures. 7

8 Design examples example 1 Soil Type: Lean Clay (CL) Unit Weight (γ) = 115 lb/ft 3 Cohesion (c) = 1,000 lb/ft 2 Friction Angle (φ) = 0 degrees = Σ [ A h (cn c + qn q when φ = 0, conservatively neglect (qn q ) term = Σ [ A h (cn c = 0.53 * 1,000 * * 1,000 * * 1,000 * 9 Authorized Dealer of = 4, , ,450 = 21,150 lbs. = 21 kips Q allowable = 21 / 2 (FOS) = 10.5 kips example 2 Soil Type = Silty Sand (SM) Unit Weight (γ) = 120 lb/ft 3 Cohesion (c) = 0 lb/ft 2 Friction Angle (φ) = 30 degrees = Σ [ A h (cn c + qn q when c = 0, = Σ [ A h (qn q q = γd where d = depth to helix plate N q,30 degrees = 18.4 = 0.53 * 120 * 8.67 * * 120 * 8.17 * * 120 * 7.67 * 18.4 = 10, , ,782 = 41,818 lbs. = 41 kips Q allowable = 41 / 2 (FOS) = 20.5 kips 150 Helical Anchor System Foundation Supportworks

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