b'5.InstalledProductLength.TheinstalledTable 10. Projected Areas* of Helical Torque Anchor Plates lengthrequiredtoaccomplishthisdesignisaHelical 6 8 10 12 14 16 summationofallthelengths givenandtobePlate Dia. Dia. Dia. Dia. Dia. Dia. determined here.Shaft Projected Area ft 2 A. The pile cap is placed 1 ft. above grade1-1/2 Sq. 0.181 0.333 0.530 0.770 1.053 1.381 B. h mid= 18 ft. (Specified by engineer)1-3/4 Sq. 0.175 0.328 0.524 0.764 1.048 1.375 C. Calculatelengthfrom h mid (mid-plate)to2 Sq. 0.168 0.321 0.518 0.758 1.041 1.396 pile tip2-7/8 Dia 0.151 0.304 0.500 0.740 1.024 1.351 (Recall that the helical plates are spaced at three3-1/2 Dia 0.130 0.282 0.478 0.719 1.002 1.329 times the diameter of the nearest lower plate.)4-1/2 Dia 0.086 0.239 0.435 0.675 0.959 1.286 h tip= [(3 x 8 dia)+(3 x 10 dia)] / 2 = 27h tip= 2-1/2 ft(Round up to 30.)A H= 0.304 + 0.500 + 0.740 = 1.544 ft 2 L = 1 ft. (Above grade) + 18 ft. + 2-1/2 ft =A H= 1.54 ft 2 1.35 ft 2 L = 21-1/2 feet (Total shaft length)This plate combination provides a total area of1.54 ft 2 , which exceeds the required plate area of 6.Torque Anchor Specifications:1.35 ft 2 , arrived at from Equation 2b. ThespecifiedTorqueAnchorassemblywillDesignationfortheselectedTorqueAnchorconsist of the following:configurationis foundonChapter1 Page 9.TAF-288-8408-10-12Thisisa2-7/8The TAF-288-84 8-10-12 TorqueAnchoris diameter standard tubular lead,havingaspecified as best fit to this project. length of 7 feet long, with an8, a 10, anda 12 diameter 3/8 thick plate on the shaft.3. Installation Torque: Equation 2 in Chapter 1TAEW-288-84 Extension, which is nominalcalculates the estimated installation torque. 7 feet long and includes coupling hardware.T = P u/ k,Where,TAE-288W-120Extension,whichisP u= 60,000 lb. (30,000 Working Load x 2.0) nominal10feetlongwithcouplingK = 9 (Chapter 1 - Table 12)T = 60,000 lb / 9 ft -1 hardware.T = 6,700 ft-lbTAB-288 NC Pile Cap for use with the 2-7/8diametertubularshaft incompression4. Torque Anchor Capacity Verification: A loading.Pile Cap has a 3/4x8x8 bearingreview of Table 2 in Chapter 1 indicates that the plate.2-7/8 diameter Torque Anchor has a UseableThetotallengthoftheassembledproductsTorsionalStrengthof9,000ft-lb.Thetorque from aboveis 24feetlong.TheTorquerequirementof 6,700ft-lbis 26%belowthe Anchorsshallbeinstalledto minimumtorsional limitof the shaft.The selection will depthof21-1/2feetatthelocationsworkforthisapplicationbaseduponthesoil designated on the plan and must develop areport stating that the soil is sandy clay fill and sufficientcompressivestrengthashomogenoussandwithnomentionofrocks, determinedbythe minimumaveragedebris or other obstructions.A review of Table installationtorqueof7,100ft-lbatthis11inChapter1showsthatthree3/8thick specified target depth of 21-1/2 feet or lower.helicalplateshaveamechanicalultimatecapacityof120,000pounds(40,000lbx3),If 7,100 ft-lb is not achieved before reachingwhichisdoubleourrequirementforthis 24feet,thenadditionalextensionsmaybeinstallation,sothemechanicalcapacityofthe required.pile assembly exceeds the project requirements. End Design Example 1ECP Technical Design ManualTorque Anchor Design Examples2021 Earth Contact Products, L.L.C.2021-09 Chapter 5Page 80 All rights reserved'