b'Design Example 1AHeavy Weight New ConstructionQuick -Solve Design MethodDesign Details: case, a factor of safety of 2.0 is used to arrive at Compressive Service Load = 30,000 lbs at each 60,000 pounds per pile ultimate capacity.pile.(See Figure 1 in Example 1 above.) 3. Select the proper compression pile from the Thesoilinformationaboutthesiteindicated6 estimated capacity graphs. Referring to Graphfeet of stiff sandy clay fill (CL) followed by 30 4 from Chapter 1 (reproduced below), notice thatfeet medium dense sand (SP) the capacity line for a Torque Anchor with 10,ECP Torque Anchor Design: The soil data 12and14diameterhelicalplatesattachedprovides only a rough description of the soil on crossesbetweenSoilClass4&5at60,000thesitewithnoSPT,N,valuesorany pounds.The10,12and14diameterplateindication of water table.The quick estimating configuration is selected for the quick design.methodfordesigningthecompressionpilesto 4.ChecktheShaftStrengthandTorsionalsupportthestructureisused.Thethorough Strength to see which shaft is suitable. Referanalysisforthisprojectusingthebearing to Table 2 in Chapter 1 and select the 2-7/8 inchcapacity equations was demonstrated in Design diameterstandardtubularshaft,which hasExample 1Page 79. Comparisons between sufficient capacity to support the load, and hastheresultsofthetwomethodswillbe sufficient torsional shaft strength for installation.discussed later. Therequiredultimatecapacityforeachpileis1.Determine the Soil Class. Referring to the 60,000lbs.The2-7/8inchstandardtubularSoil Classification Table (Chapter 1 - Table 9) a product, with 0.276 inch wall thickness, has anSoilClassbetween4and5isselectedbased Axial Compressive Load Limit rating of 100,000upon the description of the soil. poundsanda PracticalLoadLimitbasedon2. UltimateHelicalPileCapacity. The Torsional Strength of 81,000 pounds assuming aengineer provided the Service Load (or Working Useable Torsional Strength of 9,000 ft-lbs.TheLoad) on this project based upon his knowledge 2-7/8inchdiameter,0.276inchwall standardof the calculated structural weight.Because the helicalpileprovidessuitabletorsionalcapacitypilemusthavethecapabilitytosupportmore and a sufficient practical load limit to exceed thethan just the service capacity, a Factor of Safety ultimate load requirement of 60,000 pounds.must be added to the Service Load to determine The choice is verified.the Ultimate Capacity of the pile design.In thisTORQUE ANCHOR HOLDING CAPACITYMultiple Helical Plate Sizes12-14" 8-10-12" 10-12-14" 12-14-14"120000Estimated Ultimate Capacity10000080000600004000020000 Earth Contact Products0Graph 4. 1 7 6 5 4 43 62 3 5Soil ClassificationECP Technical Design ManualTorque Anchor Design Examples2021 Earth Contact Products, L.L.C.2021-09 Chapter 5Page 81 All rights reserved'