b'The calculated working load values include the design calculated. Thisisvaluableinformationtomakelive and dead loads provided by the engineer along available to the field technicians.with the permanent soil loads on the footing toes. The ECP HYD-350-DC Drive Cylinder has a piston8. Determinethe Working Load Factorof area of 8.29 in 2as stated in Pier Installation, LoadSafety: The ECP Pier System Load Ratings for the Testing&ProjectDocumentationinChapter 6.PPB-400EccentricUnderpinningSteelPierEquation 2 is used to determine the hydraulic pressuresystemonTable1inChapter 6 hasaSafeUse required onthedrivecylindertoproduce aProofRecommended Design/Service Load rating of 49,500 Load of 62,000 pounds,poundsandthe Ultimate-LimitMechanicalSystemCapacity of 99,000 pounds. The Lifting Load F.S. is Equation 2: Hydraulic Cylinder Forcedeterminedbydivided theUltimate-LimitCapacity F Cyl= A cylx P cylby the Service Loads, (P W ), from Step 7. Where:F Cyl=Cylinder force on pier = 62,000 lbFactor of Safety = Ult. Capacity/Working Load P cyl=Hydraulic Pressure, psiF.S. Side1= 99,000/38,840 = 2.5:1 (Side 1 FS WL) A cyl =Effective Cylinder Area = 8.29 in 2F.S. Side2= 99,000/41,160 = 2.4:1 (Side 2 FS WL ) (HYD-350-DC Cylinder Area - 8.29 in 2 )This design exceeds the engineers minimum factor Change Equation 2 to solve for the cylinder pressure:of safety = 2.0.The design also insures that there P cyl= F Cyl/ A cyl= 62,000 lb / 8.29 in 2will be sufficient pier capacity to break the footing P cyl= 7,479 psiloosefromthesoilandlift thestructureand thetemporarysoilloadwithoutexceedingSafeUse Use 7,500 psi( Proof Load Test)design. 12. EstimatingLiftingCylinderPressures: While9. Determine the Lifting Factor of Safety: The alloftheproject designdataareathand,theF.S.forliftingthestructurecanbecalculatedby necessary hydraulic pressure on the HYD-254 Liftingdividingthe Ultimate-LimitMechanicalSystem Ram to raise the structure should be determined in aCapacity by the Lifting Load determined in Step 6. similar manner as in Step 11.Factor of Safety = Ult. Capacity/Lifting Load P cyl= F Cyl/ A cylF.S L Side 1= 99,000/43,760 = 2.3:1 (Side 1- FS Lift) Where: F Cyl=Max. lift force on pier:F.S L Side 2= 99,000/47,040 = 2.1:1 (Side 2 FS Lift) F Cyl Side 1= 43,760 lbF Cyl Side 2= 47,040 lb10. DetermineFieldProofTest Load P cyl=Hydraulic Pressure psiRequirement for the Piers: The design calls for A cyl =Effective Cylinder Area5.16 in 2the piers to support a maximum continuous working (HYD-254 Ram Area = 5.16 in 2 )load of up to 41,160 pounds (Side 2 Heaviest Load). P cylSide 1= 43,760 lb / 5.16 in 2= 8,480According to ECP guidelines, it is recommended to P cylSide 1= 8,500 psiperform a proof test of each pile once the pile reaches P cylSide2= 47,040 lb / 5.16 in 2= 9,125firmbearing.TheECPfieldprooftestloading P cylSide 2= 9,100 psirecommendation is to load the pier to 1-1/2 times theanticipated working load or until slight lifting of the Thepressureestimatesfor theproof test wasfoundation is observed. calculated to be applied once the pier reaches firmProof Load = Working Load x 1.5 bearing.TheexpectedstructuralliftingpressuresP T= 41,160 lb x 1.5 = 61,740 lb for elevation recovery were also calculated.P T= 62,000 lbs ( Use 62,000 lbs for Proof Test Load) Thesevaluesshouldbesuppliedtothefield11. Estimating Driving Cylinder Pressure: The personneltoassureasmoothinstallationanddesignershouldalwayscalculatethehydraulic restoration.pressure requirement needed to proof test load eachpier.At the same time the hydraulic pressure required End Design Example 5to liftand recoverthelostelevation shouldbeTechnical Design AssistanceEarth Contact Products, LLC, has a knowledgeable staff that stands ready to help you with understanding howtodesignusingECPSteelPiers,installationprocedures,loadtesting,anddocumentationofeachpierplacement.If you have questions about structural weights, product selection or require engineering assistancein evaluating, designing, and/or specifying Earth Contact Products, please call us at 913 393-0007, Fax at 913393-0008.ECP Technical Design Manual -Steel Pier Design Examples2021 Earth Contact Products, L.L.C.2021-09 Chapter 7 - Page 141 All rights reserved'