Metode Konstruksi Reklamasi Pantai

Construction Method

Construction Method

Agenda Main Dike Construction Overview of Main Dike Alternatives Analysis Recommended Alternative

Construction Sequence

Dike Alternatives Analysis VPA Requested an Evaluation of

Alternatives

Reduce Cost?

Reduce Sand Required?

Improve Constructability?

Minimize Future Settlements?

Main Dike Alternatives

Over 20 Alternatives were Considered for the Main Dike/Retaining Structure

11 Determined Technically Preferable

Technically PreferableB1 Rock/Sand Dike, pre-dredge soft claysB2 Rock/Sand Dike, pre-dredge to -65 feet, Deep Soil Mixing to -100 feet +/-

D1 Partial Height Concrete Caisson, pre-dredge to -100, backfill with sand/rock to -60, place caisson

D2 Partial Height Concrete Caisson, with deep soil mixing D3 Partial Height Concrete Caisson, with sand backfillE1 Cellular Cofferdam, pre-dredge to -100, backfill (sand/rock) to -60, install steel

sheets.

E2 Cellular Cofferdam, with deep soil mixingF1 Combi-Wall, with deep soil mixingF2 Portal Frame, with deep soil mixing outside toeF3 Portal Frame, with deep soil mixing outside and insideF4 Portal Frame, with link beam, no DSM

Dike Alternatives Evaluated

Base CaseDike Section (as Presented in Feasibility Report)

Yorktown Formation(Dense Silty Sand)

Foundation(Soft Clay)

Sand FillDredged Fill

Rip Rap

700 Ft. (213 m)

14 Million CY of Sand Pre-Dredge to -60

Rock/Sand Dikes

Rock/Sand Dike Alternative B1

Yorktown FormationFoundation(Soft Clay)

Pre-Dredge

Pre-dredge -80 to -130

Sand FillQuarry Run Rock

Rock/Sand DikeAlternative B1

Surcharge

Pile Supported Wharf

Dredge Fill

Rock/Sand DikeAlternative B1

Rock/Sand Dike On DSMAlternative B


Pre-Dredge Bathtubfor DSM Equipment

Deep Soil Mixed Zone

Deep Soil Mixed Pattern

Plan

Quarry Run Rock

Rock/Sand Dike On DSMAlternative B

Precast Concrete CaissonsAlternatives D1, D2 and D3

Deltaport , Vancouver Port Authority

Precast Concrete Caissons

Sand Fill

Quarry Run Rock

Partial Height Caisson On Rock FillAlternative D1


Concrete Caisson


Yorktown Formation(Dense Silty Sand)

Foundation(Soft Clay)

Sand Fill

Dredge FillQuarry Run Rock

Concrete Caisson


Concrete CaissonOn Rock Pad

Partial Height Caisson On DSMAlternative D2

Pre-Dredge After DSMDeep Soil Mixed Zone

Sand FillDredge Fill Quarry Run Rock

Concrete Caisson

Partial Height Caisson On DSMAlternative D2

Sand Fill

Quarry Run Rock

Partial Height Caisson Sand FillAlternative D3


Sand Fill

Quarry Run Rock

Concrete Caisson

Partial Height Caisson Sand FillAlternative D3

Cellular Cofferdams Alternatives E1 and E2

Sand Fill

Sand Fill

Cellular Cofferdam

Cellular CofferdamAlternative E1


Sand FillDredge Fill

Surcharge

Cellular CofferdamAlternative E1

Cellular Cofferdam On DSM Alternative E2


Pre-Dredge Bathtubfor DSM Equipment



Surcharge

Cellular Cofferdam On DSM Alternative E2

Cellular Cofferdam

Combi-Wall


Combi-Wall With DSMAlternative F1

Combi-Wall

Sand Fill

Combi-Wall With DSMAlternative F1

Install CIP Pile Cap and P/S Conc Sheet

Pile Wall

Portal Frame With Partial DSMAlternative F2

Install 72 Dia. Steel Pipe Piles


Surcharge



Portal Frame With DSMAlternative F3

CIP Pile Cap and AZ26 Sheet Pile Wall

54 Dia. P/S Conc. Piles

Alternative F3Portal Frame With DSM


Surcharge

Cast Link Beam (El. -15)

Cast Pile Caps

Install P/S Conc Sheet Pile Wall

Portal Frame With Link BeamAlternative F4

72 Dia. Steel Pipe Piles for Portal Frame

Alternative F4Portal Frame With Link Beam


Surcharge

Wick Drains

Evaluation of Alternatives

Technical Feasible Alternatives Were: Ranked by Cost Evaluated by Risk

Factors to Evaluate Risk1. Price Risk.

Materials and/or labor fluctuations

2. Constructability & Precedence.

Difficulty to construct.

3. Material Sourcing (Sand/Rock).

Construction materials availability.

4. Permit Risk.

Potential to delay permit process.

Factors to Evaluate Risk5. Schedule Risk.

Hold-up rapid filling of cell.

6. Impact on Dredged Material Capacity.

Net storage capacity of Craney

7. Design Life.

Design life / maintenance requirements.

Costs / Risks

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B1 Rock/Sand $ 563,568,614 1 1 4 3 1 5 1 2.3B2 Rock/DSM $ 767,100,826 4 3 2 5 5 1 1 3.0D1 Caisson/Rock $ 746,844,645 2 2 5 3 1 5 2 2.9D2 Caisson/DSM $ 992,479,519 5 5 3 5 5 1 2 3.7D3 Caisson/Sand $ 707,159,632 2 2 5 2 1 5 2 2.7E1 Steel Cellular $ 631,847,815 4 4 5 2 1 5 5 3.7E2 Cellular/DSM $ 828,473,261 5 5 3 5 5 1 5 4.1F1 Combi-Wall $ 944,660,155 4 3 1 3 3 1 5 2.9F2 Portal Frame F2 $ 917,336,324 4 4 1 3 3 1 4 2.9F3 Portal Frame F3 $ 660,094,688 5 5 1 4 4 1 5 3.6F4 Portal Frame F4 $ 767,486,860 3 3 1 1 1 1 4 2.0

B1 Rock/Sand

B2 Rock/DSMD1 Caisson/Rock

D2 Caisson/DSM

D3 Caisson/SandE1 Steel Cellular

E2 Cellular/DSM

F1 Combi-WallF2 Portal Frame

F3 Portal Frame

F4 Portal Frame

$500,000,000

$600,000,000

$700,000,000

$800,000,000

$900,000,000

$1,000,000,000

$1,100,000,000

1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0

(less risk) - + (more risk)

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Cost vs Risks

Main Dike Alternatives Report

Main Dike Alternatives Analysis Report Available for Download:

http://craneyisland.info/Contractors.html

Agenda Main Dike Construction Overview of Main Dike Alternatives Analysis Recommended Alternative

Construction Sequence

CIDMMA

Shipping Channel

Existing Conditions

Pre-Dredging

Current Design Rock/Sand Dike

15.7 MCY Pre-Dredge (Total Length)

Main Dike Construction

Current Design Rock/Sand Dike6.3 MCY Sand(Total Length)

Cross Dike Construction

Dredge Depth After Construction

Pre-Dredging to the North

Filling South Cell

6.5 MCY

Construct North Dike

Filling North Cell

12.5 MCY

Achieving Final Grade

Above +1825 MCY

CIEE South & North Cell

Access Channel Dredging

8.3 MCY

Conclusion - Dikes

Component Quantity

Pre-Dredging 15.7 MCY

Access Channel Dredging 8.3 MCY

Sand Fill - Main Dike 6.3 MCY

Sand Fill - Cross Dikes 4.5 MCY

Quarry Run Rock 6.3 Million Tons

Rock/Sand Dike for Main Dike Dredging, Sand and Rock Volumes

Construction Method AgendaDike Alternatives AnalysisMain Dike AlternativesDike Alternatives EvaluatedBase CaseDike Section (as Presented in Feasibility Report)Rock/Sand DikesRock/Sand Dike Alternative B1Rock/Sand Dike Alternative B1Rock/Sand Dike Alternative B1Rock/Sand Dike On DSMAlternative BRock/Sand Dike On DSMAlternative BPrecast Concrete CaissonsAlternatives D1, D2 and D3Precast Concrete CaissonsCellular Cofferdams Alternatives E1 and E2Combi-WallEvaluation of AlternativesFactors to Evaluate RiskFactors to Evaluate RiskCosts / RisksCost vs RisksMain Dike Alternatives ReportAgendaCIDMMAExisting ConditionsPre-DredgingMain Dike ConstructionCross Dike ConstructionPre-Dredging to the NorthFilling South CellConstruct North DikeFilling North CellAchieving Final GradeAccess Channel DredgingConclusion - Dikes

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Metode Konstruksi Reklamasi Pantai