proceso constructivo de tanques postensados
DESCRIPTION
Contiene el proceso de construcción ya sea de tanques circulares y rectangulares pos tensados y algunos ejemplos de estosTRANSCRIPT
TANK APPLICATIONS
•Precastpost-tensionedconcreterectangularstructuresmanufacturedbyDutchland,Inc.areproducedforavarietyofwastewatertreatmentprocesssystems,includingSequencingBatchReactor’s,ExtendedAeration,OxidationDitches,andMembraneBio-Reactor’s.TypicalwaterpurposesincludePotableWaterTanks,FireProtectionTanksandmore.
•Dutchland,Inc.producesdesign/buildextendedaerationwastewatertreatmentplants,utilizinghighqualityequipmentandcompleteprocessdesigns. Additional information is available for extended aeration plants designed and manufactured by Dutchland, Inc.
TYPICAL INSTALLATION
•PrecastconcreteelementsaremanufacturedataPrecast/PrestressedConcreteInstitute(PCI)certifiedfacility.
•Precastconcreteelementsaresetonapoured-in-placeslabwithinareceivingkeyway.Alignmentischeckedwithlaserequipment.
•Temporarypropsareattachedtotheinnerfaceofthetankandsecuredtothebase.Top-of-wallbracketsplacedatthepaneljointsinsurepanelalignment.
•Tendonsarethreadedintotheductsandpartialtensionisappliedtoalltendons.
•Walkwaysaresetintoplaceandpartialtensionisapplied.
•Jointgroutispumpedintothejointcavities.
•Finaltensioningisappliedtoalltendons.
•Basetowallelastomericsealantsareapplied.
•Structuresarecheckedtoinsureforwater-tightness.
w w w . d u t c h l a n d i n c . c o m
RECTANGULAR TANKS
STRUCTURAL SUPERIORITY
•Exteriorandinteriorwallsaretypicallydesignedforfullwaterloadononesideandemptyontheotherside,unlessotherwisespecified.TanksaredesignedinconformancewithACI318andACI350.
•Precastpost-tensionedtankscanbeconstructedaboveground(withthebaseslabbelowfrost),completelyburied,orpartiallyout-of-grade.Tankscanalsobedesignedtowithstanddifferentialbackfill.
•Post-tensionedwalkwaysprovideastructuralupperfixedbeam.Withouttheneedforconventionalcantileverdesignrequirements,thewallthicknessofdeepstructuresisreduced.
•Thefootprintisgenerallymuchsmallerduetodeeperwallsandcommon-wallconstruction.
DURABILITY
•Allwallpanelsaresolid(notbuiltinaddedlayers).
•Allwallsarecasthorizontallyinsteelforms,providinganextraordinarilydenseandimpermeablemember.Spallingandsurfacedefectswhichistypicallyassociatedwithcast-in-placeconcreteisvirtuallyeliminated.
•Maintenanceassociatedwithsteeltankage(dewatering,sandblasting,repainting)isnotrequired.
•Exteriorcoatingsarenotrequired.Penetratingstainsordecorativecoatingsareavailableuponrequest.
P O B o x 5 4 9 • 1 6 0 R t . 4 1 • G a p , P A 1 7 5 2 7
w w w . d u t c h l a n d i n c . c o m
1. CAST-IN-PLACE POST-TENSIONED BASE SLAB (optional)
Post-tensioned base slabs are cast on-site. Post-tensioned base slabs are in compression, eliminating cracking.
•Reinforcementisplacedwithinthebaseform.•Post-tensioningtendonsareplacedwithintheformwork.•Keywayformsareplacedandcheckedforelevationanddistancefromcenterofthetank.
•Concreteisplacedinacontinuousmonolithicpourandsteeltrowelfinished.•Theformsareremovedandthebaseiscoveredorsprinkledwithwatertoachievepropercuring.
•Initialpost-tensioningisappliedafterapproximately20hoursbyPost-TensioningInstitute(PTI)certifiedpersonnel.
•Finalpost-tensioningisapplied,uponconcreteachieving75%ofdesignstrength.•Tendontailsareremovedandtheanchorpocketsarecleaned,primedandfilledwithgrout.
2. TANK WALL PANEL INSTALLATION
Conforming to the AWWA D-115 standard, all production and installation procedures insure a high quality tank system.
•Bearingpadsandshimsareplacedinthekeyways.•Wallpanelsareliftedbyacraneandsetintoplace.Alignmentischeckedwithlaserequipment.
•Temporarypropsareattachedtotheinnerfaceofthewallpanelsandsecuredtothebase.
•Tendonductextensionsareplacedandsealedbetweenthewallpanels.•Tendonsarethreadedintotheducts.•Verticaljointsareformed.Groutispumpedintothejointcavityandconsolidated.•Circumferentialpost-tensioningisadministeredbyPTIcertifiedpersonnel.•Expandinggroutispumpedintothetendonducts,topermanentlyencasethetendonsandcreateabondtothetankwalls(bondedtendontankoption).
•Anelastomericsealantisusedtosealthebasetowallconnection.•Thetankisheldinconstantcompressionbytheencasedpost-tensionedcables.
*Tanksareavailableinbondedtendonandnon-bondedtendondesigns.
CIRCULAR TANKS
P O B o x 5 4 9 • 1 6 0 R t . 4 1 • G a p , P A 1 7 5 2 7
4. THE FINISHED PRODUCT
The finished product consists of a precast post-tensioned concrete tank designed for longevity with virtually no maintenance.
A no hassle ten-year structural warranty covers the base, wall, and roof systems of all post-tensioned tank structures manufactured and installed by Dutchland, Inc.
•Allwallpanelsaresolid(notbuiltinaddedlayers).•Allwallsarecasthorizontallyinsteelforms,providinganextraordinarilydenseandimpermeablehighstrengthconcreteexterior.Thepotentialforspalling,typicallyassociatedwithshot-creteorcast-in-placeconcrete,isvirtuallyeliminated.
•TanksmanufacturedbyDutchland,Inc.do notrequireasteeldiaphragm,orexteriorcoatingsforwater-tightness.
•Norepaintingorshot-cretemaintenanceisrequired.•Exteriorcoatingsarenotrequired.Penetratingstainordecorativecoatingsareavailableuponrequest.
•Theresultisanocompromise,costcompetitivetankmanufacturedandconstructedinaccordancewithAWWAD-115standard.
3. ROOF AND SUPPORT SYSTEM INSTALLATION
Multiple tank cover designs are available, including precast concrete sloped roof systems, precast concrete domes, and aluminum geodesic domes.
•Precastconcretesectionsareliftedintoplace.•Post-tensioningtendonsareinsertedintothetendonducts.•Circumferentialpost-tensioningisadministeredbyPTIcertifiedpersonnel.•Excesstendonisremoved,capped,andsealedoff.•Polyurethaneelastomericsealantand/orClosedCellFoamGasketareappliedattheroofjointstoinsurewater-tightness.
ELLIPTICAL TANKS
w w w . d u t c h l a n d i n c . c o m
1. CONSTRUCTION
•Ellipticaltanksareconstructedwithmethodssimilartoprecastpost-tensionedrectangularandcirculartanks.
•Ellipticaltanksincludebase,wallsandwalkways.
P O B o x 5 4 9 • 1 6 0 R t . 4 1 • G a p , P A 1 7 5 2 7
2. BENEFITS
•Roundedtankendsareeasiertofabricatebyutilizingprecastratherthancast-in-placeconcrete.
•Lesstimeisgenerallyrequiredinconstructionforprecastconcretethancast-in-placeconcrete.
•Variousconfigurationsareavailabletomeettherequirementsofspecificequipmentsuppliers,includingbutnotlimitedto;Kruger,SiemensandEimco.
•Dutchland,Inc.typicallyworksdirectlywiththeequipmentmanufacturerduringthedesign/submittalphasetoensurecompatibility,resultinginbettercoordination.
Dutchland,Inc.alsospecializesindesigningandbuildingextendedaerationwastewatertreatmentplants.BNR(BiologicalNutrientRemoval)fornitrogenandphosphorusdesignsincorporateMLEconcepts.TertiarytreatmentforlowBOD/TSSisoptional.
Additional information is available upon request for Custom-Designed Wastewater Treatment Plants.
DUTCHLAND, INC. FACILITY
PRECAST MANUFACTURING FACILITY
ABOUT DUTCHLAND, INC.
•Dutchland,Inc.isaPCIcertifiedprecastconcretemanufacturingfacilitywithACIcertifiedQualityControlpersonnelandPTIcertifiedinstallationpersonnel.
•PrecastconcreteismanufacturedinLancasterCountyPennsylvaniaanddeliveredtothejobsite.
•Dutchland,Inc.specializesinmanytypesofprecastpost-tensionedconcretestructures,includingcircular,rectangular,andellipticalstructures.
•Dutchland,Inc.surveysallcustomers.100%ofcustomerssurveyedindicatedtheywouldcontractwithDutchland,Inc.again.
REASONS TO CHOOSE PRECAST POST-TENSIONED TANKS (PPT’s)
1.PPT’sutilizesuperiorconstructionmethods,andhavea10-yearnonpro-ratedwarranty.
2.PPT’sareeasilydesignedforavarietyofuses,includingwaterstorage,wastewatertreatment,stormoverflow,effluentstorage,andmanyotherpurposes.
3.PPT’sarevirtuallymaintenancefreefordecadesandaredesignedtostayincontinuousservice,eliminatingcostlymaintenanceanddowntime.
4.PPT’scanbeconstructedaboveground(withthebaseslabbelowfrost),completelyburied,orpartiallyout-of-grade.
5.MinimalsitespaceisrequiredforPPTconstruction,resultinginlesssitework.Insomecases,PPT’scanbeconstructedagainstexistingstructuresorbuildings.
6.WallpanelsandotherPPTkeyelementsaremanufacturedinaclimatecontrolledproductionfacilityratherthanonsite.
7.LesstimeistypicallyrequiredtoconstructPPT’scomparedtoconventionalcast-in-place.
8.Additionalinformationisavailableaboutpost-tensioninguponrequestoratourwebsite:www.dutchlandinc.com