b'Design Example 5Basement Tieback Using Plate AnchorsField data that was collected from the jobsite:Horizontal Force Against Basement Wall ConcreteBlockBasementWall 8ft. Wall Saturated Soil Moist Soilbowing at 4 feet above the floor 5000 Overburden height of soil (H)6-1/2 ft. 4500 Field Estimated Soil Properties: Soft, Sandy Clay4000 Earth Contact ProductsForce Against Wall - lb/ftN= 3 bpf 35003000While all of the graphs and equations may seem 2500confusing, it all can be easily understood from 2000this illustrative example.It will be seen that an 1500earthanchordesigncanbeaccomplishedina 1000matterofminutes.Whiletheresultisnota 500rigorousengineeringanalysis,theprocess 0 6 7 8 9 10providesgeneralguidancethatisvaluable Height of Soil Against Wall - ftinformation for the installer and field estimators.Anticipated Service Load Range1. Determinethe HorizontalForce:By 13 PAL - Soil Anchor Plate - F.S. = 1.5referring to the graph, Horizontal Force Against 12Basement Wall presented at right we estimate the 11horizontal force on the wall. 10 100% SandService Load Range x 1,000 lb.9Locate soil overburden of 6-1/2 feet on the wall 8 Clayey Sandon the X axis and read vertically to the solid 7 Sandy Clay6Saturated Soil line.Then read horizontally to 5 100% ClaytheYaxistodeterminethatthehorizontal 4 Earth Contact Productsforce on the wall is 1,800 pounds per lineal foot 3 PAL - Service Load Range - F.S.=1.5 .of wall. 2 2 2.5 3 3.5 4Std Penetration Test - "N" blows/ft.2.DeterminetheServiceLoadCapacity:Referring to the graph, Anticipated Service Load 4. Complete the design by determining theRange,acapacityrangeofthePAL(2.96ft 2 )embedment:Earth Anchor is determined.A field technicianCalculate Minimum Horizontal Embedment =inspected, estimated and reported the soil to be L min= H x 1.5 = 6.5 ft x 1.5 = 9.75 feetsoft, sandy clay with N = 3 +/- blows per foot. (Use 10 ft)Locate N = 3 bpf on the X axis.Because theCalculate Minimum Vertical Embedment =soilisbelievedtobe Soft,SandyClay,we D min= d wx 1 ft, Wherechoose the area below the dashed line and above d w = 6-1/2 ft (Soil height) - 4 ft (Bow in wall)the 100% clay line.Reading across to the Y D min = 2-1/2 ft + 1 ft = 3-1/2 ft (to top of earthaxis the estimated Service Load Range for a PAL plate)Earth Plate is between 7,000 and 8,000 pounds. (Note: Actual depth to rod hole at the center ofWhat we have determined: Earth Plate is 4-1/2 ft deep, minimum.) Load on wall1,800 lb/ft Service Load7,000-8,000 lb (Use 7,500 lb) The preliminary design: ConcreteBlockBasementWall - 6-1/2ftUse ECP PAL Earth Plate Anchors spaced atoverburden 4 ft O.C. at 4 ft above the floor3.Determine the Wall Plate spacing based uponBury the Earth Anchor Plate: 3-1/2 ft (Belowthe known data.Table 3Chapter 2 suggests grade to top of plate, minimum)spacing at 4 to 5 feet on center.We must refineLocate the plate at a horizontal distance: 10this by use of the data we have obtained about feet,minimum fromoutsidethebasementthis project. wall.X = T SL /(P HSx FS) 7,500 lb/1,800 lb/ft = 4.2 ft End of Example 5.(Use 4 ft on center)ECP Technical Design ManualTorque Anchor Design Examples2021 Earth Contact Products, L.L.C.2021-09 Chapter 5Page 96 All rights reserved'