b'nail achieves pullout resistance from within the increasing diameter moving upward from the tipsliding soil mass in front of the slip plane and the oftheanchor.Onceatiebackanchorleadstablesoilmasslocatedbehindtheslipplane. sectionisinstalled,extensionswithouthelicalThegeometricsystemofsoilnailplacements plates are used to extend the helical plates at thecreates an internally reinforced soil mass that is tipoftheanchortothetargetdepth.Thisstable.Figure 4 shows a sketch of a typical soil characteristic of tieback anchors is clearly shownnail installation. inFigure3.WhencomparingthesetwoNotice that each soil nail shaft has great number products, soil nails always have identical smalldiameter helical plates evenly spaced along theentire length of the Soil Nail shaft.ORIGINALGRADE SoilnailsmaybetheproductofchoiceinHELICAL SOIL NAIL applications where the vibrations from installingsheetpilingorHpilesmaycausestructuralHELICAL SOIL NAIL distresstonearbystructures.SoilnailsareREINFORCED SHOTCRETE generallyinstalledtoashallowerdepththantiebacks, which might be an advantage if deeplyBOTTOM OFEXCAVATION installedtiebackshavetocrosspropertylinesand/or terminate under structures owned by otherparties; or where otherwise obstructed.Figure 4 Soil nails work very efficiently in medium densehelical plates along the shaft all with the same todensesandwithStandardPenetrationTestdiameter.These helical plates are evenly spaced values, N 7 blows per foot.They also arealong the length of the shaft.By comparison, a suitedforlowplasticitycohesivesoil(clays)tiebackanchorhasoneormorehelicalplates with SPT values, N 8 blows per foot, whichsituated at the tip of the tieback.Helical plates also have soil cohesion values exceeding 1,000ontiebackanchorsgenerallyhave plates psfthroughtheentiredepthofsoiltobestabilized.ECP Soil Nail ComponentsECPSoilNailproductsconsistofashaft samediameterastheleadsection.Soilnailfabricatedfromeither1-1/2inchor1-3/4inch extensionsaresuppliedwithintegralcouplingssolid square steel bar.Welded along the entire andhardwareforattachmentto an alreadylength of the soil nail shaft are identically sized installedleadorotherextensionsallowingthehelicalplatesmeasuringsixoreightinches soilnailassemblytoreachthedesigneddiameter with a plate thickness of 3/8 inch.The embedment length requirement.available lead shaft lengths for ECP Soil Nails Soilnailsmaybeterminatedwithalargeflatare nominally five or seven feet long; however, wallplateoranassemblyofreinforcingbarsother lengths may be specially fabricated.Soil weldedtoasmallwallplate.Thewallplatesnailextensionsarealsoavailableinnominal willeventuallybeembeddedinto areinforcedlengths of five and seven feet.The extensions shotcrete wall covering.also contain evenly spaced helical plates of theProduct Benefits Quickly Installed Using Rotary Hydraulic Torque Motor Installs With Little Or No Vibration Installs In Areas With Limited Access No Post-TensioningImmediate Support No Need for H Piles, Sheet Piling, or Walers In Temporary Applications, Soil Nail Removal and Reuse is PossibleECP Helical Torque Anchors Technical Service Manual2021 Earth Contact Products, L.L.C.2021-09 Chapter 3 - Page 52 All rights reserved'