b'Design Example 8Ultimate Capacity from Field DataInthisexercisetheanticipatedultimate Where,capacitiesofthepiledesignsfromDesign k = 9 (Table 12)Example1and DesignExample 1Bwillbe T Example 1= 7,140 ft-lb (Design Example 6 )determined.This information is used to confirm P u-Design 1= 9 x 7,140 ft-lbthattheinstalledpilesmeetorexceedthe P u-Design 1= 64,260 lbrequirements set out in the original designs Design 1: Verified64,260 lb 60,000 lbEquation 2 from Chapter 1 is used to calculate DesignExample1B - Calculatetheultimatetheultimatecompressivecapacityofthepile pile capacity of the 3-1/2 Diameter Pile:based upon data provided from the field.Recall P u-Design1B= Ult. Capacity of the 3-1/2 piles:that in Design Example 1 - Heavy Weight New Where,k = 8 (Table 12Chapter 1)ConstructionProjectrequiredanultimateT Design 1B= 8,190 ft-lb (Design Example 6)capacity at each pile of 60,000 pounds. P u-Design1B = 8 x 8,190 ft-lbEquation 2:Ultimate Capacity - P u= k x T P u-Design 1B= 65,520 lbWhere, Design 1B: Verified65,520 lb 60,000 lbP u= Ultimate Capacity of Torque Anchor- (lb)T = Final Installation Torque - (ft-lb) Theresultsofthecalculationsconfirmthe (Averaged Over the Final 3 to 5 Feet) ultimate capacity determined from the field datak = Empirical Installation Torque Factor - (ft -1 ) exceeds the design ultimate capacity stated in theDesignExample1 -CalculatetheUltimate specifications of Design Examples 1 and 1B.Pile Capacity of the 2-7/8 Diameter Pile: End Design Example 8P u-Design 1= Ult. Capacity of the 2-7/8 dia. pilesDesign Example 8AUltimate Capacity from Field DataQuick-Solve Design MethodThisexercisewilldeterminetheultimatepile MotorTorqueuntil reachingbolddashedcapacity based upon field data using the Quick- graph line that represents the 2-7/8 inch diameterSolve design method.Thecomparison shaftconfiguration.Thenmovehorizontallytobetween the calculated design specifications and the axis at left to check if installed pile ultimatethe actual field capacity will verify whether the capacity exceeds 60,000 pounds.pile installation is satisfactory. LookingcarefullyatthepointwheretheDesign Example 7A determined that the output horizontalplotintersectsthe Ultimatetorque at the motor shaft was 6,750 ft-lb at the Capacity axis, the field generated shaft torsionterminationofthepileinstallation.Graph 1 at the termination of the pile installation showsfrom Chapter 4 (shown on next page) provides a to be approximately 60,000 lb.This verifies thatmethod to estimate the Ultimate Capacity of the theactualinstalledpilecapacity meetsdesigninstalledhelicalproducts.Acomparisontothe specification of 60,000 ft-lbs.design requirement will determine if the installed Thecapacityforthe3-1/2diameterpileispilecapacityexceedsthespecified Ultimate similarly determined from Graph 1 at 8,200 ft-lbCapacity. and reading up to the short dashed line, then toEstimate the location on the horizontal axis for the left to see the ultimate capacity estimate ofshaft torsion of 6,750 ft-lb (Slightly to the left of 60,000 lbs.the 7,000 ft-lb grid line). The legend near the top End Design Example 8ofthegraphprovideschoicesbetweenvariousshaftsizes.Readupwardfromthe 6,750 ft-lbReview of Results of Example 8 & 8AThe value in using the Quick -Solve design method is that by using graphs it provides rapidfield results.Thismethod will notexactly determinethe fieldinstallation capacity,butitquicklyindicateswhethertheinstallation ismeetingorexceedingspecifications.Iftheengineer requires the actual installed ultimate capacity, then it must be calculated from thefield data.ECP Technical Design ManualTorque Anchor Design Examples2021 Earth Contact Products, L.L.C.2021-09 Chapter 5Page 105 All rights reserved'