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Dn tanks prestressed_concretetank
This document provides information about prestressed concrete storage tanks from DNTanks. It discusses DNTanks' construction procedures, the benefits of prestressed concrete tanks, and applications. DNTanks is the largest manufacturer of prestressed concrete tanks in the world, with over 130 years of combined experience constructing over 2,500 tanks globally. Prestressed concrete tanks provide benefits like being leak-free, requiring less maintenance than steel tanks, and allowing various installation methods. The document also discusses inspection and retrofitting of existing concrete tanks.
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Dn tanks prestressed_concretetank
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- 5. • ACI 350 – Code Requirements for Environmental EngineeringConcrete Structures • ACI 350.3 – Seismic Design of Liquid‐Containing Concrete Structures • ASCE 7/IBC • ACI 372R – Design and Construction of CircularWire‐ and Strand‐Wrapped Prestressed Concrete Structures • AWWA D110 – Standard forWire‐ and Strand‐ Wound, Circular, Prestressed ConcreteWaterTanks
- 6. • Inner concrete core • Horizontal prestressing providing compression: Efficient use of Materials •Flexible floor‐wall connection • Secondary Assurance of Water‐Tightness • Vertical post tensioning • Embedded steel diaphragm
- 8. • Floor/ Foundation • Wall • Roof • Prestressing
- 9. Floor /Foundation
- 10. Spread footing Membranefloor slab
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- 13. Bearing Pad PVCWaterstop Seismic Cables Finished Concrete Anchored flexible base
- 14. 40 Durometer BearingPad Soft Pad 9” PVC Waterstop with Centerbulb Seismic Base Restraint Cables Finished Concrete Footing Surface Finished Concrete Footing Surface No Mild Reinforcing Anchored flexible base
- 15. Seismic Design &Operation Loads Seismically Isolated - Flexible Not Isolated - Rigid
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- 18. TYPE I TYPEIII
- 19. ` ` Pour Window PVC Waterstop InjectionPort Finished Concrete Vertical Threadbar Threadbar Anchor Plate Seismic Cables Cast‐in‐place Vertically Post‐tensioned
- 20. Steel Curtain SteelCurtain
- 21. WallForm and Pour
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- 24. Epoxy grout following Post- Tensioning VerticalPost-Tensioning
- 25. TYPE I TYPEIII
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- 27. Precast PanelBeds
- 28. Panels InPlace
- 29. Wall Slot WallSlot Interior Plate In Place Formwork
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- 31. Initial ShotcreteBaseCoat
- 32. SeismicBase RestraintCables
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- 37. dome detailing Domedetailing
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- 43. Center Cab Pin Tower Base Strand CircumferentialPrestressing
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- 45. 240ksi, 7‐wire, galvanized strand Strand Circumferential Prestressing
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- 51. Why Prestress aConcrete Tank?
- 52. INCREASEDDUCTILITY HIGHQUALITY COST EFFECIENT CAST‐IN‐PLACE CONCRTETANK (Conventional) PRESTRESSEDCONCRETETANK
- 53. When to usea Prestressed Concrete Tank? ALWAYS….!
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- 60. 3.0MGTESTank Orlando, FL
- 61. 2.0 MGReservoir Jamul, CA
- 64. 2.0MG Reservoir Jamul, CA
- 65. • Con’s Prestressed ConcreteTanks Slightly Greater Initial Cost • Pro’s Leak Free Design SteelTanks must be taken out‐of‐service for repainting (Steel Needs Redundancy) – Concrete Does Not Steel limited to at grade installation. Concrete construction allows at grade construction, partial backfill, or complete burial Resistance to Gun Fire
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- 68. Welded Steel TanksMust Be Maintained to Prevent Structural Defects
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- 70. 1.0 MG TankMaintenance Project
- 71. Fullerton, CA –5.0 MG Tank Maintenance Project
- 72. Average of bidsresults for maintaining welded steel tanks from the past few years. Cumulative Average from bids yields a Unit Cost for Maintenance of $7.50 per SF
- 73. 83.0 FT. 25.00 FT. 1.00 M G Tank Diameter = Tank Dimensions Usuable Tank Capacity (1.5% Sloped Floor)= Side Water Depth = Welded Steel Tank Specific Assumed Freeboard = 7 FT. Total Steel Tank Volume = 1.28 M G Assumed Steel Tank Cost = $ 800,000.00 DOLLARS Prestressed Concrete Tank Specific Assumed Freeboard = 3 FT. Total Prestressed Concrete Tank Volume = 1.12 M G DOLLARSAssumed Prestressed Concrete Tank Cost = $ 1,150,000.00 Welded Steel Tank Maintenance Costs Return Period Sq FtMaintenance Scheduled Unit Price Total Price 20 Blast exterior and re-application of coating 14,092 $7.50 $105,690.00 20 Blast interior and re-application of coating 19,500 $7.50 $146,250.00 20 Engineering Design Cost (Estimate 10%) $25,194.00 20 Construction Management / Inspection Cost (Estimate 10%) $25,194.00 TOTAL MAINTENANCE COST PER 20 YEAR RETURN PERIOD $302,328.00 Return Period LS Unit Price Total Price 20 LS $20,000.00 $20,000.00 $20,000.00TOTAL MAINTENANCE COST PER 20 YEAR RETURN PERIOD Powerwashing, Routine Maintenance, and Inspection Maintenance Scheduled Prestressed Concrete Tank Maintenance Costs
- 75. LocalInvolvement Concrete Suppliers Lumber Local Labor Rentals Ice Cream Shop
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- 84. CCOONNCCRRETE TAETE TANNKKSS EERVRVICESICES
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- 88. IncreasedSecurityNeeds
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- 122. Think Value Mike Harper mike.harper@dntanks.com KevinPeacock kevin.peacock@dntanks.com