I-74 Corridor Project Update - Iowa Department of Transportation
- 1. I-74 Corridor Project UpdateDecember 6, 20101
- 3. Arch Span3
- 4. 4Arch Span
- 5. Arch Span Deck and Hanger StudySteel framing supporting the deck optimizedTransverse steel beams tied to concrete deck and spacing decreased from 39’-9” to 26’-6”Longitudinal steel beams tied to transverse beamsImproved performance – deck stiffness is increasedCost savings of approximately $3 million due to decreased steel weightUse two cables per hanger to add redundancy.Loads can be carried by one cable per hanger.Designed for total loss of a hanger. 5
- 6. Arch Span Foundation StudyArch Span Foundation - Spread Footing founded on rockConventional foundation for Arch / Long Span Structures Minimize potential long term risks/maintenanceArch Span and Approach Span Foundations designed for long term rock scour6
- 7. Arch Span7
- 8. Elevated Seismic Design CriteriaNo significant cost penalty for moving from 1,000 year to 2,500 year return periodWill use Construction Details for Seismic Zone 3 as opposed to Seismic Zone 1Small price to pay for added seismic resistance for this major structure8
- 9. Vessel Collision Forces on Bridge PiersMass of barge and tow speed are used to calculate energy transferred from barge to pierTow speed varies from 8 mph to 10 mphLoads due to fully loaded tanker > 5,000 Kips (2,500 Tons)Additionally, all river piers will be designed for vessel collision loads due to a loaded runaway barge9
- 10. I-74 Piers10
- 11. I-74 Piers11
- 12. River Piers12At Normal Pool River Levels
- 13. 13River PiersAt Flood Stage
- 14. 14Viaduct PiersView of Bettendorf Viaduct
- 15. 15Viaduct PiersView of Bettendorf Viaduct
- 16. Pedestrian Trail / Bike Path16
- 17. Pedestrian Railing – River Side17
- 18. Pedestrian Railing – Arch Side18
- 19. 19Pedestrian Railing - Details
- 20. Pedestrian Trail / Bike Path Overlook20
- 23. Traffic and Separation Barriers23
- 24. Traffic and Separation Barriers24
- 25. Suggested Colors and FinishesArch RibStructural Steel – painted whiteConcrete – use of admixtures to “lighten”Steel GirdersExterior of Fascia Girder – painted medium greyInterior Girders – weathering steelPainted either side of piersRailingsTraffic Barrier Railing – galvanized (grey color)Pedestrian Railing – natural aluminum 25
- 26. 26Retaining WallsCast-in-Place (CIP) Concrete Facing
- 27. Retaining Walls27With Variable Ground Surface
- 28. Retaining WallsMechanically Stabilized Earth (MSE)28
- 29. 29Retaining WallsWith Variable Ground Surface
- 31. Overpass Abutment and Traffic Barrier31
- 33. Intelligent Transportation System (ITS) Elements in Current ScopeClosed Circuit Television (CCTV) CamerasVideo Detection SystemSide Fire Microwave Radar SensorsDynamic Message Signs (DMS) Road Weather Information Systems (RWIS)Fiber Optic and Wireless Communications33
- 34. ITS Elements Being ConsideredBridge Health Monitoring SystemsSMART Bridge SystemsBridge Security Monitoring SystemsLane Usage TechnologyForward Looking Infrared Camera SystemsAutomated Work Zone Technology34
- 35. Light Poles – I-74 MainlinePole Finish at Corridor and Viaducts35
- 36. Light Poles – Local Road / Arch Span Pole Finish at Arch Span36
- 37. Lighting TypeCeramic Discharge Metal Halide To be used in the 53rd Street Interchange ImprovementsHigh Pressure Sodium (HPS) - CRI 21-23 DOT StandardCeramic Discharge Metal Halide (CDMH) - CRI 65-7537
- 40. Possible Aesthetic Lighting for River Spans40
- 41. Pedestrian Trail / Bike Path Lighting41
- 44. Construction Contracts5 Year Construction DurationReduced from early estimates of 8 yearsMinimize inconvenience to motoristsDelay impacts to I-74 traffic for as long as possibleContract Determination ConsiderationsBonding capacity of local contractorsDollar amount of each contractAvailability of laborConstruction stagingConstruction efficiencies44
- 45. Central and South Section ContractsTotal of 12 Construction Contracts4 construction contracts in IllinoisCombined roadway and bridge8 construction contracts in Iowa and over River4 bridge contracts4 roadway contractsVarious supply/specialty contractsIntelligent Transportation SystemsLight poles and luminairesLandscapingAesthetic featuresBridge demolition 45
- 46. I-74 Corridor Project UpdateThank You.46
Editor's Notes
- #3: Nov 12 slide 83
- #4: Nov 20 slide 101
- #7: Nov 12 slide 80
- #8: Nov 20 slide 101
- #17: Nov 20 slide 10
- #18: Nov 20 slide 1
- #21: Nov 20 Slide 32
- #26: Nov 12 slide 21
- #27: Nov 12 slide 36
- #28: Nov 12 slide 37
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- #31: Nov 12 slide 38
- #32: Nov 12 slide 13
- #39: Nov 20 slide 105
- #40: Nov 20 slide 110
- #41: Nov 12 slide 54
- #45: Nov 12 slide 21
- #46: Nov 12 slide 21