activity 221 concrete pad estimate：活动221：混凝土垫估计

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1、Activity2.2.1ConcretePadEstimateIntroductionConcreteoftenaccountsforalargepercentageofthetotalcostofaproject.Manytimesitrepresents15-20%ofthetotalcost,dependingonthebuildingmaterialsandmethodsofconstructionchosen.Ifyouplantoorderconcrete,itisessentialtoorderthecorrectamount.Ifyouordertoolitt

2、le,problemswillariseasyoutakemeasurestoquicklyacquiremore.Ifyouordertoomuch,youhavewastedmoneyandresourcesandwillhavetodisposeoftheexcessconcrete.Withproperplanningandpreparation,thepouringofconcreteusuallysignalsanexcitingbeginningofaconstructionproject.Equipment·Engineeringnotebook·Calcula

3、tor·A1–ExampleUtilityShedDrawingProcedureCostfortheShedConcretePadInthisactivityyouwillcalculatethecostofpouringtheutilityshedconcretefloorslabasshownonA1-ExampleUtilityShedDrawing.Theslabcontainsconcreteandreinforcingrods(rebar).Youwillalsoneedasmallamountofmaterialtocreatetheforms.1.Usethe

4、diagramoftheshedfloorbelowtocalculatethenumberofcubicfeetofconcreterequiredtoconstructthepad.Convertcubicfeettocubicyardsandrecordtheamountinthequantitycolumnofthetable.2.Usealocalconcretevendortofindacurrentprice/yard3ofconcrete.Recordthefinalcostofconcretetobepouredfortheutilityshed.3.Calc

5、ulatethenumberandcostoftherebarneededtoconstructthepad.Determinethecostofrebarusinglocalpricing.Rebarshouldbespaced24in.aparttoformagridpatterninthepad.Rebarcomesin10ftsections.Whenmorethanonebarisneededtoextendover10ft,adjacentbarsareoverlapped(endtoend)6in.andwiredtogether.Plantoprovidea3i

6、n.edgedistance;thatis,terminatetherebar3in.shortoftheedgeoftheconcrete.4.Recordthenumberof12ftlong2x6sandthenumberof16ftlong2x6s(whichwillbetrimmedto4inchwidths)neededtobuildtheforms.Assumethatyouneednoothermaterialfortheforms.Determinethecostoftheboardsusinglocalpricingfoundinadvertisements

7、,phonecontact,ortheInternet.ProjectLeadTheWay,Inc.Copyright2010CEA–Unit2–Lesson2.1–Activity2.2.1–ConcretePadEstimate–Page3MaterialSize/DescriptionQuantityUnitCostCostConcrete12ftx16ftx4in.   Steel#4(9/16in.x10ft)   Forms2in.x6in.–12ft   Forms2in.x6