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SFOBB East Span Seismic Safety Project
San Francisco-Oakland Bay BridgeSan Francisco-Oakland Bay BridgeEast Span Seismic Safety ProjectEast Span Seismic Safety Project
SFOBB East Span Seismic Safety Project
SAS Constructability Workshop 04-012064
• Self-Anchored Suspension Span consists of a 160-meter single steel tower with a main cable and inclined suspenders supporting two steel orthotropic decks of a 385-meter main span and a 180-meter back span. The workshop will concentrate on identification of Constructability issues for the tower and orthotropic boxes.
SFOBB East Span Seismic Safety Project
Participants
• Contractors that plan to bid 04-012064 SAS/YBI contract
• steel, fabrication firms that plan to submit estimates
• steel plate suppliers, and
• Caltrans Project Manager
SFOBB East Span Seismic Safety Project
Purpose is to identify
• the capacity of the domestic steel market to produce plate steel for orthotropic boxes and tower
• what is fabricators ability to fabricate and transport pieces
• what affects contractors ability to bid the project due to the above issues
SFOBB East Span Seismic Safety Project
Purpose is to identify
• contractors Constructability concerns
• concerns with the tower “pick”
SFOBB East Span Seismic Safety Project
What can Constructability achieve?
• public and construction safety improvements
• cost reductions and enhanced quality
• improved and shortened project schedule
SFOBB East Span Seismic Safety Project
Constructability
• Construction planning and Constructability analysis which integrates the diverse and quite often conflicting criteria into a coherent solution
SFOBB East Span Seismic Safety Project
Constructability
• optimum use of construction knowledge and experience in planning, design, procurement & field operations to achieve overall project objectives (Caltrans Project Engineer Academy)
SFOBB East Span Seismic Safety Project
Constructability
• bid process design - bid - build
• considered throughout project delivery up to award
SFOBB East Span Seismic Safety Project
Constructability is consideration and resolution of barriers to bids
open • no bidders
• risk
• financing
• no materials or cost prohibitive materials
• environmental permitting
SFOBB East Span Seismic Safety Project
Constructability is consideration and resolution of barriers to bids
open• are there responsible bidders
• is there a competitive bidding process bid process design - bid - build
• what do we do to make our PS&E package attractive to the bidder?
SFOBB East Span Seismic Safety Project
SAS Constructability Workshop 04-012064
bids open January 2003 , advertises September 2002, and
open for westbound traffic in 2006
SFOBB East Span Seismic Safety Project
BUY AMERICA WAIVER APPROVED BY FHWA
• Tower Saddle (Upper Portion)• S-Wire Cable Wrapping• MacAlloy Bars
SFOBB East Span Seismic Safety Project
What are the necessary production rates for
• delivery of plate steel,
• fabrication,
• erection?
SFOBB East Span Seismic Safety Project
lessons learned on other projects that might relate to
Constructability of the tower and orthotropic boxes?