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San Francisco-Oakland Bay Bridge East Span Seismic Safety Project Contractor Outreach

San Francisco-Oakland Bay Bridge East Span Seismic Safety Project Contractor Outreach January 7 & 8, 2003. SFOBB New East Span January 2003 Business Enterprise Outreach. Welcome - my name is Sarah Picker Purpose : networking for business relationships to construct SFOBB East Span Agenda

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San Francisco-Oakland Bay Bridge East Span Seismic Safety Project Contractor Outreach

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  1. San Francisco-Oakland Bay BridgeEast Span Seismic Safety Project Contractor Outreach January 7 & 8, 2003

  2. SFOBB New East Span January 2003 Business Enterprise Outreach • Welcome - my name is Sarah Picker • Purpose : networking for business relationships to construct SFOBB East Span • Agenda • Sign-In Please • Survey - day or night meetings

  3. Show of handsHow did you find out about the outreach?Newspaper, letter?

  4. Welcome • Dan McElhinney, District 4 Chief Deputy Toll Bridge Program • Opening Remarks

  5. Project Limits San Francisco Oakland Project Limits

  6. OAKLAND TOUCHDOWN SKYWAY YBI SAS Existing Bridge

  7. T1/E2 foundations (04-0120E4) Transition structure (04-0120H4) E2 Retrofit/Substation (04-0120G4) T1 SAS superstructure (04-0120F4) W2 foundation (04-0120C4) Building demolition (04A1701) Yerba Buena Island YBI/SAS Contracts

  8. YBI Building Demolition(R/W) 04A1701 • a contract to remove three USCG buildings and one state building executed as a right-of-way service contract

  9. YBI Substation & Viaduct Retrofit 04-0120G4 • a contract to construct a replacement electrical substation on YBI near the westbound on-ramp and complete relatively simple bridge retrofit work near the YBI tunnel (this work is combined due to the close proximity of the work)

  10. SAS E2/T1 Structures 04-0120E4 • a contract to construct the Self-Anchored Suspension bridge in-bay foundations, the main tower (T1) and pier E2 just to the east of YBI

  11. SAS Superstructures 04-0120F4 • a contract to construct the tower and superstructure of the Self-Anchored Suspension bridge

  12. YBI Structures 04-0120H4 • a contract to construct the temporary detour and permanent bridges on YBI

  13. T1/E2 foundations (04-0120E4) Transition structure (04-0120H4) E2 Retrofit/Substation (04-0120G4) T1 SAS superstructure (04-0120F4) W2 foundation (04-0120C4) Building demolition (04A1701) Yerba Buena Island YBI/SAS Contracts

  14. Recap of SFOBB East Span Seismic Safety Project • already awarded • PIDP 04-012084 • Skyway 04-012024 • Geofill 04-012054 • Archeological Excavation and Midden Site 04-012074

  15. Recap of SFOBB East Span Seismic Safety Project • YBI Building Demolition(R/W) • SAS W2 Structures 04-0120C4 • YBI Substation & Viaduct Retrofit 04-0120G4 • SAS E2/T1 Structures 04-0120E4 • SAS Superstructures 04-0120F4 • YBI Structures 04-0120H4

  16. Recap of SFOBB East Span Seismic Safety Project • Oakland Touchdown 04-012044 • Existing Bridge Demolition 04-012094

  17. SFOBB East Span • Tonight’s discussions relate to the YBI Substation and Viaduct Retrofit construction contract we advertised for bid December 2002 • bid opens February 25, 2003

  18. What is the schedule? • SAS E2/T1 04-0120E4 will advertise January 21, 2003 bids open May 20, 2003 • SAS Superstructures 04-0120F4 will advertise February 3, 2003 bids open July 9, 2003 • YBI Superstructure advertise TBA

  19. Other Introductions • Will the Potential Prime Contractors in the room volunteer to raise their hands? • Would the DBE certified businesses raise their hands? • Would the potential DBE or small businesses raise their hands?

  20. San Francisco-Oakland Bay BridgeEast Span Seismic Safety Project

  21. Roadway Items Bob Zandipour Branch Chief, Toll Bridge Program

  22. T1/E2 foundations (04-0120E4) Transition structure (04-0120H4) E2 Retrofit/Substation (04-0120G4) T1 SAS superstructure (04-0120F4) W2 foundation (04-0120C4) Building demolition (04A1701) Yerba Buena Island YBI/SAS Contracts

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

  24. Environmental Constraints at YBI Historic Structures W2 foundation contract W2 foundation contract USCG Facilities

  25. Special Aquatic Site - Yerba Buena Island Yerba Buena Island

  26. Retrofit/Substation Scope • Construct New YBI Substation • West Bound On Ramp Roadway Work • Demolish Existing Substation and Maintenance Garage • Viaduct Retrofit Work

  27. Yerba Buena Island • New Substation

  28. Environmental Constraints at YBI Historic Structures Substation contract USCG Facilities

  29. Substation CONTROL / COMPUTER GARAGE ELECTRICAL ROOM OFFICE PARKING LOT MECHANICAL ROOM

  30. Substation • One story 468 square meter structure including • Mechanical Room • major equipment – 2 air compressors • Electrical Room • major equipment – 14.47 kV metal clad switchgear, 1000 kV power transformer • Control/Computer Room • Office • Bathroom • Break Room • Garage • Battery Room

  31. Utility Work • Relocate the following utilities • Compressed Air • Overhead Electrical • Underground Electrical • Sanitary Sewer • Water • Drainage

  32. San Francisco-Oakland Bay BridgeEast Span Seismic Safety Project

  33. Structure Items Glenn Fleming Mechanical Engineer Structural Design, Toll Bridge Program

  34. Introduction to YBI Viaduct Structure Retrofit • 3 Frames of Bridge Construction • Frames 1 & 2 - West Segment Retrofit • Frame 3 - WB On Ramp Approach Retrofit

  35. YBI Viaduct - General PlanFrame 1 & 2 - Construct West Segment RetrofitFrame 3 - Construct WB On Ramp Approach Retrofit 33m 33m 33m Exp JT 31 34 35 38 39 42 43 Bent WB on-ramp Frame 1 Frame 2 Frame 3 Tunnel SF WB off-ramp

  36. Frame 1 - Typical Section • Construct Concrete • Seat Extensions, • drill and bond dowels Wall,typ Typical Section Near Bent 33 Design Note: Floor beams are simply supported by continuous retaining walls with partial height counterfort walls. Analysis has determined floor beams are vulnerability to unseating.

  37. Frame 2 - Typical Section • Construct Concrete Collars at counterforts and short columns • Construct Seat Extensions Top of Wall Typical Section Near Bent 37 Design Note: Counterforts support short columns along the north edge of deck. Analysis has determined inadequate shear capacity of the short columns. Additionally, floor beams are vulnerability to unseating.

  38. Strengthen Counterfort and Short Column - Frame 2 • Construct counterfort & short column concrete collars • Drill & pressure grout

  39. Frame 3 - Typical Section 3 5 6 1 7 2 4 Typical Section Bent 39 • 1. Strengthen (encase) north-side viaduct bent caps. • 2. Strengthen (encase) columns located beneath ramp. • 3. Strengthen (encase) longitudinal girder beneath ramp. • 4. Strengthen (encase) and tie-down, ramp column footings. • 5. Construct seat extension and bolster at ramp abutment diaphram. • 6. Extend bent caps to ramp columns. • 7. Construct shear wall and retaining walls. • Demo and widen deck from bent 41 to just beyond • bent 42 (not shown). Design Note: Analysis has identified that the caps and girders are not capable of resisting the column plastic moment.

  40. Substation Relocation WB On-ramp to SF • Remove existing Caltrans electrical substation and garage, and reconstruct substation Bent 47 • Note proximity to WB ramp

  41. Retrofit Contract Item List & Quantities

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