San Francisco-Oakland Bay Bridge East Span Seismic Safety Project

SFOBB East Span Seismic Safety ProjectSFOBB East Span Seismic Safety Project

San Francisco-Oakland Bay BridgeSan Francisco-Oakland Bay BridgeEast Span Seismic Safety ProjectEast Span Seismic Safety Project

March 12, 2002March 12, 2002

Contractor Outreach


Project LimitsProject Limits

Project IntroductionProject Introduction


YBITRANSITION

SUSPENSION SKYWAY

OAKLANDAPPROACH

SKYWAYSUSPENSION

YBI

TRANSITION

OAKLANDAPPROACH

OAKLANDGEOFILL

Existing Bridge

Contract Limits


Project IntroductionProject Introduction

Bridge Cross SectionBridge Cross Section


Replacement - Computer simulationReplacement - Computer simulation

AlternativesAlternatives

Photo simulation of the Replacement Alternative N-6 as viewed from Yerba Buena Island


YBI Eastbound On-RampYBI Eastbound On-Ramp


Yerba Buena IslandYerba 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


Contractor Access on YBIContractor Access on YBI

Potential Barge Mooring Areas

USCG Search and Rescue Base

Vehicular Access

USCGAccess


Environmental Constraints on YBIEnvironmental Constraints on YBI

USCG Facilities

Historic Structures


YBI Special Aquatic SitesYBI Special Aquatic Sites


EELGRASS


Construction IssuesConstruction Issues

STAGE 1 Construct new

Bridge Construct

eastbound (EB) and westbound (WB) detours

Construction StagingConstruction StagingReplacement AlternativeReplacement Alternative



STAGE 2 Shift traffic on to

detours at Oakland TD

Construct new WB approach at Oakland TD

Complete construction of detours at YBI



Viaduct Modifications:• Retrofit existing YBI viaduct• Widen existing viaduct for westbound detour• Construct temporary portal frame• Remove columns

YBI Viaduct Modifications

To Oak

land

To

San

Fra

ncis

co


Remove existing Caltrans electrical substation and garage

Electrical Substation

WB On-rampto SF


Reroute WB Traffic

Plan

WB detour

Typical Section

Route WB traffic to WB detour

Existing Bridge

EB Detour

WB EB (lower deck)

Plan

WB detour

Existing Bridge

EB Detour


EB

WB

WB Traffic is on new Skyway, new SAS, and WB detour.

EB Traffic is still on existing bridge (lower deck).

Traffic


Portal Frame and Seat Extension

Plan

WB detour

EB Detour

Construct seat extension at south side

… and construct portal frameExisting Bridge

Typical Section


Load Transferred to Portal Frame

Plan

WB detour

EB Detour

Typical Section

Portal frame:• Supports upper deck• Creates opening for EB detour operation

Existing Bridge

WB

EB


Eastbound Detour

(7) Route EB Traffic to EB Detour

Existing Bridge

To San Francisco

To Oakland

Eastbound Detour



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



Construction IssuesConstruction IssuesConstruction StagingConstruction Staging

Replacement AlternativeReplacement Alternative

STAGE 4 Construct remaining

section of the new bridge at YBI

Shift all traffic to new bridge


Construction IssuesConstruction IssuesConstruction StagingConstruction Staging

Replacement AlternativeReplacement Alternative

STAGE 5 Dismantle existing

bridge


Yerba Buena Island Traffic Yerba Buena Island Traffic ImpactsImpacts

Westbound on-ramp (east side of island)Westbound on-ramp (east side of island)



Eastbound off-ramp (east side of island)Eastbound off-ramp (east side of island)



Southgate RoadSouthgate Road


Cut columns to transfer load to portal frame

Number ofClosures

Activity Requiring EB and WB Full Bridge Closures

4

Hours per Closure

6

Closure Alternatives

28

Simultaneous Eastbound and Westbound Full Bridge Closures


Activity Requiring EB Only Full Bridge Closures

6 23Remove 96 upper deck concrete panels

8 13Remove 48 stringers and 9 floor beams

Remove side trusses and replace steel curbs with temporary “K” rails

12 11

Closure Alternatives

Number ofClosures

Hours per Closure

Eastbound Only Full Bridge Closures


UtilitiesUtilities

Westbound Eastbound

6 NPS ReclaimedWater

10 NPS Sanitary Sewer with

18 NPS Casing

12 NPS Water

NOT TO SCALE

CT Airand Water


FLOOR BEAM SECTION

INSTALLATION OF UTILITIES INSIDE MAIN SPANINSTALLATION OF UTILITIES INSIDE MAIN SPAN

E LINE

UTILITY TRAYS

TRAVELER

BIKE PATH


YBI SUBSTATION

MACALLA ROAD

USCG ROAD

W LINE

E LINE

UTILITY TRENCH PIER W2

PROPOSED UTILITY RELOCATIONS ON YBIPROPOSED UTILITY RELOCATIONS ON YBI


ELEVATION

CONCRETE DUCT BANK ANCHORS

SECTION A-A

SECTION B-B

SECTION C-C

ELEVATION

SLOPE STABILIZATION

UTILITY DUCT INSTALLATION DETAILSUTILITY DUCT INSTALLATION DETAILS

1.500

0.300

0.800


PLAN AT GRADE

PLAN AT BOTTOM DECK

SECTION A-AMAIN SPAN DETAILS OF CONDUIT

RISER UP TO W2 WB

TRAYS

CONDUITS

ROUTING OF UTILITY DETAILS AT PIER W2ROUTING OF UTILITY DETAILS AT PIER W2

W2

C.L. PIER W2

UTILITY TRAYS

TRAVELER

RETAINING WALL


• 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

JONES ACT INFORMATION

San Francisco-Oakland Bay Bridge East Span Seismic Safety Project

Documents

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