3. reservoir (1) - pnws-awwa · 2014. 6. 3. · wire wrapped post tensioned. types of prestressed...
TRANSCRIPT
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Concrete Reservoirs(Every Tank is Unique)
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Date Title 2
Garden Home
5th Street Reservoir
Waluga Reservoir #2
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5th Street Lebanon
Date Title 3
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5th Street Lebanon
Date Title 4
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Waluga Reservoir #2
Date Title 5
OBEC’s OFFICE
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Waluga Reservoir #2
Date Title 6
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Garden Home
Date Title 7
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Garden Home
Date Title 8
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Reservoir Facts
5th StreetType: Prestressed
Height: 45’
Diameter: 124’
Volume: 4MG
Roof Type: Flat Slab
Seismic: 0.67g
Bid Cost: $1.9M
Waluga #2Type: Prestressed
Height: 36’
Diameter: 131’
Volume: 3.5MG
Roof Type: Dome
Seismic: 0.98g
Bid Cost: $2.0M
Garden HomeType: Prestressed
Height: 37’-5”
Diameter: 89’-4”
Volume: 1.75MG
Roof Type: Flat Slab
Seismic: 0.97g
Bid Cost: ~$1.8M
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Why Prestressed Concrete?
1
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Reservoir Options
Fiberglass
Steel
Concrete
Bolted
Welded
Cast-in-Place
Prestressed
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Bolted Steel
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Welded Steel
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Cast-in-Place Concrete
Date Title 14
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Prestressed Concrete
Date Title 15
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Types of Prestressed TanksPrestressed
Wire Wrapped Post Tensioned
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Types of Prestressed Tanks
Type I Type II Type III Type IV D115
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Advantages of Prestressed
• Low Initial Cost*• No Coating Requirements• Low Maintenance• Long Life • Good Water Tightness• Good Seismic Performance
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Reservoir Type by Size
0
0.5
1
1.5
2
2.5
3
3.5
44+
Cap
acity
(MG
)
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Pre-stressed Cost EfficiencyC
apac
ity (M
G)
D/H Ratio
0
2
4
6
8
10
1 1.5 2 2.5 3 3.5 4
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5th Street
• 4 Million Gallons of Storage• Alternatives Study• Cost/Maintenance
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WR2
• 3.5 Million Gallons• WR1 - Concrete• Cost / Maintenance
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Garden Home
• Replacing 2 Steel Tanks• Existing Site• 1.75 Million Gallons• Owner Preference
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Structural Design Considerations
2
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Design Considerations
Structural Considerations• Design Criteria• Floor/Foundation• Roof Type• Seismic Detailing• Construction Staging
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Non-Structural Design Considerations
3
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Design Considerations
Non-Structural Considerations• Tank Mixing• Aesthetics• Piping• Instrumentation• Bidding/Schedule• Public Involvement
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5th Street Lebanon
4
• Site Layout• Piping• Alternate Bidding
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5th Street Lebanon (Site Layout)
Date Title 29
2MG
New 2MG Tank #2
New 4MGTank
New 2MG Tank #1
New 4MGTank
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5th Street Lebanon (Piping)
Date Title 30
2MG
New 4MGTank
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5th Street Lebanon
Alternative Bidding:D115 vs D110 Type 1
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Waluga Reservoir 2
5
• Foundation• Roof Type• Site Constraints• Public Involvement*
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WR2 (Foundation)
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WR2 (Dome Roof)
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WR2 (Site Constraints)
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Garden Home
6
• Seismic Detailing• Aesthetics• Tank Mixing
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Garden Home (Seismic)
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Garden Home (Seismic)
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Garden Home (Seismic)
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Garden Home (Seismic)
Cable Specs
Diameter = 0.6”Spacing = 4-ftStrand/bundle = 10
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Garden Home (Seismic)
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Garden Home (Aesthetics)
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Garden Home
Date Title 43
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Garden Home (Tank Mixing)
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Garden Home (Tank Mixing)
Passive vs. Active Mixing
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Conclusions
• Strong Partnerships• Collaboration leads to Innovation• Every tank is unique