223482044-Metode-Konstruksi-Reklamasi-Pantai.pdf

Reklamasi Pantai

1. Construction
Method
Construction
Method

2. Agenda
ƒMain Dike Construction
ƒOverview of Main Dike Alternatives Analysis ƒRecommended Alternative
ƒConstruction Sequence

3. Dike Alternatives Analysis
ƒVPA Requested an Evaluation of
Alternatives
ƒReduce Cost? ƒReduce Sand Required? ƒImprove Constructability? ƒMinimize Future Settlements?

4. Main Dike Alternatives
ƒOver 20 Alternatives were Considered for
the Main Dike/Retaining Structure
ƒ11 Determined Technically Preferable

5. Technically Preferable B1 Rock/Sand Dike, pre-dredge soft clays
B2 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 backfill
E1 Cellular Cofferdam, pre-dredge to -100’, backfill (sand/rock) to -60’, install steel
sheets.
E2 Cellular Cofferdam, with deep soil mixing
F1 Combi-Wall,with deep soil mixing
F2 Portal Frame, with deep soil mixing outside toe
F3 Portal Frame, with deep soil mixing outside and inside
F4 Portal Frame, with link beam, no DSM
Dike Alternatives Evaluated

6. Base Case
Dike Section (as Presented in Feasibility Report) Yorktown Formation
(Dense Silty Sand)
Foundation
(Soft Clay)
Sand Fill
Dredged Fill
Rip Rap
≈700 Ft. (213 m)
ƒ14 Million CY of Sand ƒPre-Dredge to -60’

7. Rock/Sand Dikes

8. Rock/Sand Dike
Alternative B1
Yorktown Formation
Foundation
(Soft Clay)
Pre-Dredge
Pre-dredge -80’ to -130’

9. Sand Fill
Quarry Run Rock
Rock/Sand Dike
Alternative B1

10. Surcharge
Pile Supported
Wharf
Dredge Fill
Rock/Sand Dike
Alternative B1

11. Rock/Sand Dike –On DSM
Alternative B
Yorktown Formation
Foundation
(Soft Clay)
Pre-Dredge “Bathtub”
for DSM Equipment
Deep Soil
Mixed Zone
Deep Soil Mixed Pattern
Plan

12. Quarry Run Rock
Rock/Sand Dike –On DSM
Alternative B

13. Precast Concrete Caissons
Alternatives D1, D2 and D3
Deltaport , Vancouver Port Authority

14. Precast Concrete Caissons

15. Sand Fill Quarry Run Rock
Partial Height Caisson –On Rock Fill
Alternative D1
Pre-dredge
-80’ to
-130’

16. Concrete Caisson
Partial Height Caisson –On Rock Fill
Alternative D1

17. Yorktown Formation
(Dense Silty Sand)
Foundation
(Soft Clay)
Sand Fill
Dredge Fill
Quarry Run Rock
Concrete Caisson
Partial Height Caisson –On Rock Fill
Alternative D1

18. Concrete Caisson
On Rock Pad
Partial Height Caisson –On DSM
Alternative D2
Pre-Dredge After DSM
Deep Soil Mixed Zone

19. Sand Fill
Dredge Fill
Quarry Run Rock
Concrete Caisson
Partial Height Caisson –On DSM
Alternative D2

20. Sand Fill Quarry Run Rock
Partial Height Caisson –Sand Fill
Alternative D3
Pre-dredge
-80’ to
-130’

21. Sand Fill
Quarry Run Rock
Concrete Caisson
Partial Height Caisson –Sand Fill
Alternative D3

22. Cellular Cofferdams
Alternatives E1 and E2

23. Sand Fill
Sand Fill
Cellular Cofferdam
Cellular Cofferdam
Alternative E1
Pre-dredge
-80’ to
-130’

24. Sand Fill
Dredge Fill
Surcharge
Cellular Cofferdam
Alternative E1

25. Cellular Cofferdam –On DSM
Alternative E2
Yorktown Formation
Foundation
(Soft Clay)
Pre-Dredge “Bathtub” for DSM Equipment
Deep Soil Mixed Zone

26. Sand Fill
Dredge Fill
Surcharge
Cellular Cofferdam –On DSM
Alternative E2
Cellular Cofferdam

27. Combi-Wall

28. Pre-Dredge After DSM
Deep Soil
Mixed Zone
Combi-Wall –With DSM
Alternative F1
Combi-Wall

29. Sand Fill
Combi-Wall –With DSM
Alternative F1

30. Install CIP Pile Cap
and P/S Conc Sheet
Pile Wall
Portal Frame –With Partial DSM
Alternative F2
Install 72” Dia. Steel
Pipe Piles

31. Pre-Dredge After DSM
Deep Soil
Mixed Zone
Portal Frame –With Partial DSM
Alternative F2

32. Sand Fill
Dredge Fill
Surcharge
Portal Frame –With Partial DSM
Alternative F2

33. Deep Soil
Mixed Zone
Portal Frame –With DSM
Alternative F3
CIP Pile Cap and AZ26
Sheet Pile Wall
54” Dia. P/S
Conc. Piles

34. Alternative F3
Portal Frame –With DSM
Sand Fill
Dredge Fill
Surcharge

35. Cast Link Beam
(El. -15’)
Cast Pile Caps
Install P/S Conc
Sheet Pile Wall
Portal Frame –With Link Beam
Alternative F4
72” Dia. Steel Pipe Piles for Portal Frame

36. Alternative F4
Portal Frame –With Link Beam
Sand Fill
Dredge Fill
Surcharge
Wick Drains

37. Evaluation of Alternatives
ƒTechnical Feasible Alternatives Were:
ƒRanked by Cost ƒEvaluated by Risk

38. Factors to Evaluate Risk
1.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.

39. Factors to Evaluate Risk
5.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.

40. Costs / Risks
Short Name
Construction
Cost - No Wharf
Price Risk
Constructability
& Precedence
Material
Sourcing
(sand/rock)
Permit Risk
Schedule Risk
Impact on
Dredge Material
Capacity
Design Life
Avg. Risk
B1 Rock/Sand
$ 563,568,614 11431512.3
B2 Rock/DSM
$ 767,100,826 43255113.0
D1 Caisson/Rock
$ 746,844,645 22531522.9
D2
Caisson/DSM
$ 992,479,519 55355123.7
D3
Caisson/Sand
$ 707,159,632 22521522.7
E1 Steel Cellular
$ 631,847,815 44521553.7
E2
Cellular/DSM
$ 828,473,261 55355154.1
F1
Combi-Wall
$ 944,660,155 43133152.9
F2
Portal Frame F2
$ 917,336,324 44133142.9
F3
Portal Frame F3
$ 660,094,688 55144153.6
F4
Portal Frame F4
$ 767,486,860 33111142.0

41. B1 Rock/Sand
B2 Rock/DSM
D1 Caisson/Rock
D2 Caisson/DSM
D3 Caisson/Sand
E1 Steel Cellular
E2 Cellular/DSM
F1 Combi-Wall
F2 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) - <------- Risk -----> + (more risk)
Cost (8,500 LF)
(Based on Assumed Subsurface in Phase 1)
Cost vs Risks

42. Main Dike Alternatives Report
ƒMain Dike Alternatives
Analysis Report
ƒAvailable for Download:
http://craneyisland.info/Contractors.html

43. Agenda
ƒMain Dike Construction
ƒOverview of Main Dike Alternatives Analysis ƒRecommended Alternative
ƒConstruction Sequence

44. CIDMMA
Shipping Channel

45. Existing Conditions

46. Pre-Dredging
Current Design –
Rock/Sand Dike
15.7 MCY Pre-Dredge
(Total Length)

47. Main Dike Construction
Current Design –
Rock/Sand Dike
6.3 MCY Sand
(Total Length)

48. Cross Dike Construction
Dredge Depth After
Construction

49. Pre-Dredging to the North

50. Filling South Cell
6.5 MCY

51. Construct North Dike

52. Filling North Cell
12.5 MCY

53. Achieving Final Grade
Above +18
25 MCY
CIEE South & North Cell

54. Access Channel Dredging
8.3 MCY

55. 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
ƒRock/Sand Dike for Main Dike ƒDredging, Sand and Rock Volumes