Prestressed Storage Tanks
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1 Prestressed Storage Tanks Mike Harper Regional Manager / Kevin Peacock Regional Manager /
2 DN Tanks overview Construction Procedures and Design for Prestressed Concrete Tanks Benefits of Prestressed Concrete Tanks Applications for Prestressed Concrete Tanks Inspection and Repair of other Types of Concrete Tanks Concrete Tank Services
3 Formed in 2011 from the merger of DYK and Natgun Design and construct prestressed concrete tanks The largest prestressed concrete tank manufacturer in the world 130 years of combined experience Over 2,500 completed tanks
4 The highest value tank Custom sizes from 40,000 gallons to 40,000,000 gallons and beyond Heights up to 85 Design and construction capabilities Currently constructing over 40 projects worldwide
5 ACI 350 Code Requirements for Environmental Engineering Concrete Structures ACI Seismic Design of Liquid Containing Concrete Structures ASCE 7/IBC ACI 372R Design and Construction of Circular Wireand Strand Wrapped Prestressed Concrete Structures AWWA D110 Standard for Wire and Strand Wound, Circular, Prestressed Concrete Water Tanks
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
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8 Floor / Foundation Wall Roof Prestressing
9 Floor / Foundation
10 Spread footing Membrane floor slab
11 Monolithic Floor
12 6 PVC Waterstop at Joint and galvanized bars Multiple Floor Sections
13 Seismic Cables PVC Waterstop Bearing Pad Finished Concrete Anchored flexible base
14 40 Durometer Bearing Pad Soft Pad Seismic Base Restraint Cables 9 PVC Waterstop with Centerbulb 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
16 Los Angeles, California January 1994, Northridge 6.8M
17 Tank Wall
18 TYPE I TYPE III
19 Pour Window Vertical Threadbar ` Injection Port Threadbar Anchor Plate ` S e ismic Cables PVC Waterstop F i n i sh ed C o ncr e t e Cast in place Vertically Post tensioned
20 Steel Curtain Steel Curtain
21 Wall Form and Pour
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23 Vertical Post Tensioning
24 Vertical Post-Tensioning Epoxy grout following Post- Tensioning
25 TYPE I TYPE III
26 Precast Embedded Diaphragm
27 Precast Panel Beds
28 Panels In Place
29 Wall Slot Wall Slot Interior Plate In Place Formwork
30 Internal Waterstop Cove
31 Initial Shotcrete Base Coat
32 Seismic Base Restraint Cables
33 Roof Construction
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35 Column supported flat slab roof
36 Column supported flat slab roof
37 dome detailing Dome detailing
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39 Finished Dome
40 Flat Slab Dual land use Slightly Lower overall height Easily utilizes flexible connection between wall and roof More economical at larger diameters Concrete Dome No internal obstructions for easier cleaning Accommodates more differential settlement More economical at smaller diameters
41 Abrasive Blasting / Prestressing / Shotcrete
42 Abrasive / Water Blasting Tank wrapping (Strand & Wire) Shotcrete covercoat
43 Strand Circumferential Prestressing Cab Center Pin Tower Base
44 Abrasive Blasting / Water Blasting (Type I)
45 Strand Circumferential Prestressing 240 ksi, 7 wire, galvanized strand
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47 Wire Circumferential Prestressing (Type III)
48 Shotcrete encasement
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51 Why Prestress a Concrete Tank?
52 CAST IN PLACE CONCRTE TANK (Conventional) PRESTRESSED CONCRETE TANK INCREASED DUCTILITY HIGH QUALITY COST EFFECIENT
53 When to use a Prestressed Concrete Tank? ALWAYS.!
54 33.0 MG, 40.0 MG, and (2) 7.5 MG Reservoirs San Marcos, CA
55 200,000 Gallon Reservoir Sausalito, CA
56 125,000 Gallon Reservoir Outside El Paso, TX
57 (2) 5.0 MG Reservoirs El Segundo, CA
58 (23) 4.0 MG Reservoirs Carson, CA
59 Modified Egg Digester
60 3.0 MG TES Tank Orlando, FL
61 2.0 MG Reservoir Jamul, CA
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64 2.0 MG Reservoir Jamul, CA
65 Con s Prestressed Concrete Tanks Slightly Greater Initial Cost Pro s Leak Free Design Steel Tanks 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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67 Pro s Reduced Freeboard Steel AWWA D100 Freeboard = Sloshing Height PSC AWWA D110 Freeboard = Designed case by case 2.0 MG Tank on Peninsula Sloshing height 12 Steel Tank = 12 Freeboard Prestressed Concrete Tank = 5 Freeboard Eliminate High Maintenance Costs!
68 Welded Steel Tanks Must Be Maintained to Prevent Structural Defects
69 Tracks Welded Steel Maintenance Costs Lakeside, CA 2.25 MG $411, Capitola, CA 1.2 MG $360, Spring Valley, CA 1.0 MG $259, Spring Valley, CA 2.0 MG $359, Los Altos Hills, CA 0.8 MG $252,400.00
70 1.0 MG Tank Maintenance Project
71 Fullerton, CA 5.0 MG Tank Maintenance Project
72 Average of bids results 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 Tank Dimensions Tank Diameter = Side W ater Depth = Usuable Tank Capacity (1.5% Slope d Floor)= We lde d Stee l Ta nk Specific Assumed Freeboard = Total Stee l Ta nk Volume = Assumed Steel Tank Cost = $ 83.0 FT FT MG 7 FT MG 800, DOLLA R S Prestressed Concre te Ta nk Specific Assumed Freeboard = 3 FT. Total Prestresse d Concrete Ta nk Volume = 1.12 MG Assumed Prestressed Concrete Tank Cost = $ 1,150, DOLLA R S Welded Steel Tank Maintenance Costs Re turn Period Maintenance Scheduled Sq Ft Unit Price Total Price 20 Blast exterior and re-application of coating 14,092 $7.50 $105, Blast interior and re-application of coating 19,500 $7.50 $146, Engineering Design Cost (Estimate 10%) $25, Construction Management / Inspection Cost (Estimate 10%) $25, TOTAL MAINTENANCE COST PER 20 YEAR RETURN PERIOD $302, Prestressed Concrete Tank Maintenance Costs Re turn Period Maintenance Scheduled LS Unit Price Total Price 20 Powerwashing, Routine Maintenance, and Inspection LS $20, $20, TOTAL MAINTENANCE COST PER 20 YEAR RETURN PERIOD $20,000.00
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75 Local Involvement Concrete Suppliers Lumber Local Labor Rentals Ice Cream Shop
76 All Around You!
77 8 MG Graham Reservoir, Mountain View, CA
78 0.5 MG Reservoir, Laconia, NH
79 2 MG Reservoir, Anaheim, CA
80 Vent 1.1 MG Reservoir, Naval Hospital, San Diego, CA
81 1.2 MG Reservoir, Signal Hill, CA
82 0.6 MG Reservoir, Overland Park, KS
83 10 MG Reservoir, Los Angeles, CA
84 CONCRETE TANK S ERVICES
85 DN Tanks Concrete Tank Services Division Division of DN Tanks Works Nationwide Performs inspection, rehabilitation, retrofit, and seismic upgrades of all types of concrete tanks
86 Water Districts asked for our help, even on tanks that we did not build. Response to State Requirements for Periodic Inspection Response to New State Mandated Regulations Response to Aging Infrastructure Seismic upgrades
87 Response to Change in Tank Needs
88 Increased Security Needs
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101 Location: SF Bay, CA Problem: Seismic Retrofit Forming of new machine footing and seismic cable system application Seismic cable attached to wall before automated shotcrete application
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121 DN Tanks overview Construction Procedures and Design for Prestressed Concrete Tanks Benefits of Prestressed Concrete Tanks / Applications Modifying or Retrofitting Existing Concrete Water Storage tanks
122 Think Value Mike Harper Kevin Peacock
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