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San Francisco-Oakland Bay Bridge East Span Seismic Safety Project

San Francisco-Oakland Bay Bridge East Span Seismic Safety Project. Contractor Outreach. March 12, 2002. Project Introduction. Project Limits. Contract Limits. OAKLAND APPROACH. YBI TRANSITION. SUSPENSION. SKYWAY. OAKLAND GEOFILL. SKYWAY. SUSPENSION. OAKLAND APPROACH. YBI

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San Francisco-Oakland Bay Bridge East Span Seismic Safety Project

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  1. San Francisco-Oakland Bay BridgeEast Span Seismic Safety Project Contractor Outreach March 12, 2002

  2. Project Introduction Project Limits

  3. Contract Limits OAKLAND APPROACH YBI TRANSITION SUSPENSION SKYWAY OAKLAND GEOFILL SKYWAY SUSPENSION OAKLAND APPROACH YBI TRANSITION Existing Bridge

  4. Project Introduction Bridge Cross Section

  5. Alternatives Photo simulation of the Replacement Alternative N-6 as viewed from Yerba Buena Island Replacement - Computer simulation

  6. YBI Eastbound On-Ramp

  7. Yerba Buena Island • Heavy topography -- 60 meter elevation change • Steep slopes • Narrow winding roads • USCG base for 24 hour Search and Rescue unit • Lots of underground utilities

  8. Contractor Access on YBI Vehicular Access Potential Barge Mooring Areas USCG Access USCG Search and Rescue Base

  9. Environmental Constraints on YBI Historic Structures USCG Facilities

  10. YBI Special Aquatic Sites

  11. EELGRASS

  12. Construction Issues Construction Staging Replacement Alternative • STAGE 1 • Construct new Bridge • Construct eastbound (EB) and westbound (WB) detours

  13. Construction Issues Construction Staging Replacement Alternative • STAGE 2 • Shift traffic on to detours at Oakland TD • Construct new WB approach at Oakland TD • Complete construction of detours at YBI

  14. To San Francisco YBI Viaduct Modifications To Oakland • Viaduct Modifications: • Retrofit existing YBI • viaduct • Widen existing viaduct • for westbound detour • Construct temporary • portal frame • Remove columns

  15. WB On-ramp to SF Electrical Substation Remove existing Caltrans electrical substation and garage

  16. WB detour WB detour (lower deck) EB WB Existing Bridge EB Detour EB Detour Plan Reroute WB Traffic Route WB traffic to WB detour Typical Section Existing Bridge Plan

  17. Traffic WB Traffic is on new Skyway, new SAS, and WB detour. EB Traffic is still on existing bridge (lower deck). WB EB

  18. WB detour EB Detour Portal Frame and Seat Extension Construct seat extension at south side Typical Section Existing Bridge … and construct portal frame Plan

  19. WB detour EB Detour Load Transferred to Portal Frame • Portal frame: • Supports upper deck • Creates opening for EB detour • operation Typical Section WB Existing Bridge EB Plan

  20. To Oakland To San Francisco Eastbound Detour (7) Route EB Traffic to EB Detour Existing Bridge Eastbound Detour

  21. Construction Issues Construction Staging Replacement Alternative • STAGE 3 • Shift traffic to new WB bridge and detours at YBI • Construct EB landing at Oakland TD • Remove existing bridge from Bent 48 to YB1

  22. Construction Issues Construction Staging Replacement Alternative • STAGE 4 • Construct remaining section of the new bridge at YBI • Shift all traffic to new bridge

  23. Construction Issues Construction Staging Replacement Alternative • STAGE 5 • Dismantle existing bridge

  24. Yerba Buena Island Traffic Impacts • Westbound on-ramp (east side of island)

  25. Yerba Buena Island Traffic Impacts • Eastbound off-ramp (east side of island)

  26. Yerba Buena Island Traffic Impacts • Southgate Road

  27. Simultaneous Eastbound and Westbound Full Bridge Closures Activity Requiring EB and WB Full Bridge Closures Closure Alternatives Hours per Closure Number of Closures Cut columns to transfer load to portal frame 4 6 2 8

  28. Eastbound Only Full Bridge Closures Closure Alternatives Activity Requiring EB Only Full Bridge Closures Hours per Closure Number of Closures Remove 96 upper deck concrete panels 23 6 Remove 48 stringers and 9 floor beams 13 8 Remove side trusses and replace steel curbs with temporary “K” rails 12 11

  29. 6 NPS Reclaimed Water 10 NPS Sanitary Sewer with 18 NPS Casing CT Air and Water 12 NPS Water Utilities Eastbound Westbound NOT TO SCALE

  30. INSTALLATION OF UTILITIES INSIDE MAIN SPAN E LINE BIKE PATH UTILITY TRAYS TRAVELER FLOOR BEAM SECTION

  31. PROPOSED UTILITY RELOCATIONS ON YBI YBI SUBSTATION UTILITY TRENCH PIER W2 MACALLA ROAD W LINE E LINE USCG ROAD

  32. UTILITY DUCT INSTALLATION DETAILS ELEVATION CONCRETE DUCT BANK ANCHORS SECTION C-C 1.500 0.800 0.300 SECTION B-B ELEVATION SLOPE STABILIZATION SECTION A-A

  33. ROUTING OF UTILITY DETAILS AT PIER W2 W2 C.L. PIER W2 UTILITY TRAYS TRAVELER RETAINING WALL TRAYS PLAN AT GRADE CONDUITS SECTION A-A MAIN SPAN DETAILS OF CONDUIT RISER UP TO W2 WB PLAN AT BOTTOM DECK

  34. JONES ACT INFORMATION • Covers domestic transportation of merchandise • Requires floating cranes to be domestically built, owned, and operated • Foreign floating cranes can be used as long as they do not “transport” merchandise

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