b'This plate combination provides a total area of Capacity of 80,000 pounds (40,000 lb x 2) for0.87 ft 2 , which exceeds the required 0.59 ft 2 . the two 3/8 thick helical plates.The mechanicalcapacityoftheselectedpileconfigurationisTable 10. Projected Areas* of Helical more than adequate. Torque AnchorPlatesHelical 6 8 10 12 14 16 6.InstalledProductLength.ThestiffsiltyPlate Dia. Dia. Dia. Dia. Dia. Dia. clay has been targeted as the soil stratum whereShaft Projected Area ft 2 the helical plates will be founded.A depth of 181-1/2Sq. 0.181 0.333 0.530 0.770 1.053 1.381 feet was specified in order to locate the plates1-3/4 Sq. 0.175 0.328 0.524 0.764 1.048 1.375 below the weaker soil layers.This depth places2 Sq. 0.168 0.321 0.518 0.758 1.041 1.396 theplates midwayinto theverystiffclay2-7/8 Dia 0.151 0.304 0.500 0.740 1.024 1.351 stratum.Theinstalledlengthrequiredto3-1/2 Dia 0.130 0.282 0.478 0.719 1.002 1.329 accomplish this design depth is specified = 18 ft4-1/2 Dia 0.086 0.239 0.435 0.675 0.959 1.286 L = 18 ft7. TorqueAnchorSpecifications: TheThe designation for the standard length Torque Anchorproduct thatwasselectedby either Torque Anchor assembly is specified from themethod is: TAF-150-60 08-10 standardproductslistednearthebeginningofChapter 1:As an alternate, a single 12 diameter plate couldbeselectedwithaprojectedareaof0.77ft 2 .TAF-150-6008-10,whichisa1-1/2solid(Two 8 diameter plates also have sufficient area square bar product on a standard 5 foot longof0.67 ft 2 ,butthisconfigurationisa special shaft,with8&10diameter,3/8thickorder product.) helical plates4. Installation Torque: Equation 2 in Chapter 1TAE-150-84 Extension, which is nominally 7givesanestimationoftherequiredinstallation feet long, but the coupling overlaps 3 inchesshaft torsion.It is determined as follows: providinganeffectivelengthof6-9TheT = P u/ k (Equation 2) extensionincludescouplinghardware. Twoextensions are required and equal 13-1/2 feet. Where,P u= 18,000 lbTAB-150NCPileCap that fitsoverthe1- k= 10 (Table 12Chapter 1)T = 18,000 lb / 10 ft -1 1/2squarebarandhasa1/2x6x6T = 1,800 ft-lb bearing plate.5. Torque AnchorCapacity Verification: A The total length of the assembled products from above is 18-1/2 feet long.review of Table 2 in Chapter 1 indicates that the Placementsshallbe7feetoncenteralongthe1-1/2solidsquarebarTorqueAnchorhasa perimeter grade beamUseable Torsional Strength of 7,000 ft-lb, which An average installation torque of 1,800 ft-lb orisnearlyfourtimestheinstallationtorque more must occur at the target depth of 18 feet.required for this project.There was no mention It is recommended that additional extension beofrocks,debrisorotherobstructionsinthe on hand in case the shaft torque requirement isproject information. Therefore this is excellent not achieved at 18 1/2 feet.product for this project. Table 11 in Chapter 1 End Design Example 2showsthe UltimateMechanicalHelicalPlateTechnical Design AssistanceEarth Contact Products, LLC. has a knowledgeable staff that stands ready to helpyouwithunderstandinghowtopreparepreliminarydesigns,installationprocedures, load testing, and documentation of each placement when using ECPDesigned and TorqueAnchors.IfyouhavequestionsorrequireengineeringassistanceinEngineered evaluating, designing, and/or specifying Earth Contact Products, please call us atTo Perform 913 393-0007, Fax at 913 393-0008.ECP Technical Design ManualTorque Anchor Design Examples2021 Earth Contact Products, L.L.C.2021-09 Chapter 5Page 86 All rights reserved'