Concrete Reservoirs - PNWS-AWWA

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Concrete Reservoirs. (Every Tank is Unique) ... Reservoir Options. Fiberglass. Steel. Concrete. Bolted. Welded. Cast-in-Place. Prestressed ...
Concrete Reservoirs (Every Tank is Unique)

Waluga Reservoir #2 Garden Home

5th Street Reservoir

Date

Title

2

th 5

Date

Street Lebanon

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3

th 5

Date

Street Lebanon

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4

Waluga Reservoir #2

OBEC’s OFFICE

Date

Title

5

Waluga Reservoir #2

Date

Title

6

Garden Home

Date

Title

7

Garden Home

Date

Title

8

Reservoir Facts 5th Street

Waluga #2

Garden Home

Type: Prestressed

Type: Prestressed

Type: Prestressed

Height: 45’

Height: 36’

Height: 37’-5”

Diameter: 124’

Diameter: 131’

Diameter: 89’-4”

Volume: 4MG

Volume: 3.5MG

Volume: 1.75MG

Roof Type: Flat Slab

Roof Type: Dome

Roof Type: Flat Slab

Seismic: 0.67g

Seismic: 0.98g

Seismic: 0.97g

Bid Cost: $1.9M

Bid Cost: $2.0M

Bid Cost: ~$1.8M

1 Why Prestressed Concrete?

Reservoir Options Fiberglass Bolted Steel

Welded Cast-in-Place

Concrete

Prestressed

Bolted Steel

Welded Steel

Cast-in-Place Concrete

Date

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14

Prestressed Concrete

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15

Types of Prestressed Tanks Prestressed

Wire Wrapped

Post Tensioned

Types of Prestressed Tanks

Type I

Type II

Type III

Type IV

D115

Advantages of Prestressed • • • • • •

Low Initial Cost* No Coating Requirements Low Maintenance Long Life Good Water Tightness Good Seismic Performance

Reservoir Type by Size 4+4 3.5

Capacity (MG)

3 2.5 2 1.5 1 0.5 0

Pre-stressed Cost Efficiency Capacity (MG)

10 8 6 4 2 0 1

1.5

2

2.5

D/H Ratio

3

3.5

4

th 5

Street

• 4 Million Gallons of Storage • Alternatives Study • Cost/Maintenance

WR2

• 3.5 Million Gallons • WR1 - Concrete • Cost / Maintenance

Garden Home • Replacing 2 Steel Tanks • Existing Site • 1.75 Million Gallons • Owner Preference

2 Structural Design Considerations

Design Considerations Structural Considerations

• Design Criteria • Floor/Foundation • Roof Type • Seismic Detailing • Construction Staging

3 Non-Structural Design Considerations

Design Considerations Non-Structural Considerations

• Tank Mixing • Aesthetics • Piping • Instrumentation • Bidding/Schedule • Public Involvement

4 5th Street Lebanon • Site Layout • Piping • Alternate Bidding

th 5

Street Lebanon (Site Layout) New 2MG Tank #2 New 2MG Tank #1

New 2 4MG MG Tank New 4MG Tank

Date

Title

29

th 5

Street Lebanon (Piping)

2 MG

New 4MG Tank

Date

Title

30

th 5

Street Lebanon

Alternative Bidding: D115 vs D110 Type 1

5 Waluga Reservoir 2 • Foundation • Roof Type • Site Constraints • Public Involvement*

WR2 (Foundation)

WR2 (Dome Roof)

WR2 (Site Constraints)

6 Garden Home • Seismic Detailing • Aesthetics • Tank Mixing

Garden Home (Seismic)

Garden Home (Seismic)

Garden Home (Seismic)

Garden Home (Seismic) Cable Specs Diameter = 0.6” Spacing = 4-ft Strand/bundle = 10

Garden Home (Seismic)

Garden Home (Aesthetics)

Garden Home

Date

Title

43

Garden Home (Tank Mixing)

Garden Home (Tank Mixing) Passive vs. Active Mixing

Conclusions

• Strong Partnerships • Collaboration leads to Innovation • Every tank is unique

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