Article in piledrivers trade mag, on East Span San Francisco-Oakland Bay Bridge Project. Looks like it's all metric, I'll just quote a bit.....
Nat http://www.piledrivers.org/pdca/pdf/pdcaSpring2002.pdf (page 29) By Roger Howard Jr., PE Anthony R. Dover, GE Saba Mohan, PE Robert F. Stevens, PD, PE This paper briefly describes the Pile Installation Demonstration Project (PIDP) and summarizes the findings and conclusions based on the installation of three large-diameter steel pipe piles in the San Francisco Bay as part of the San Francisco-Oakland Bay Bridge (SFOBB)East Span Seismic Safety Project. The PIDP was conducted to better understand pile handling, marine construction opera-tions, pile driveability and pile setup asso-ciated with installing large-diameter, steel pipe piles into San Francisco Bay sedi-ments.Three 2.5-meter (8 feet) diameter pipe piles were driven in the area between the existing Bay Bridge and the planned replacement bridge alignment. Additional details of the PIDP can be found in the Pile Installation Demonstration Project Geotechnical Report (Fugro-EM, 2001a) and in Howard et al. (2002) and Mohan et al. (2002). Background The San Francisco-Oakland Bay Bridge East Span Seismic Safety Project willl replace the east span of the world�s busiest toll bridge and is the largest in the history of the California Department of Transportation (Caltrans). The existing east span of the SFOBB carries 10 lanes of traffic between Yerba Buena Island and Oakland. During the 1989 Loma Prieta earthquake, the east span of the existing bridge suffered considerable damage,including the collapse of a deck section. In 1995, the Seismic Advisory Board sug-gested replacement in lieu of retrofit. In June 1998, the single-tower, self-anchored suspension bridge structures and haunched concrete skyway structures were selected for final design. Final design of the chosen structure types and alignment was begun by the joint venture of TY Lin International and Moffatt & Nichol Engineers in the late fall of 1998, with the geotechnical site characterization and foundation engineering being provid-ed by a joint venture of Fugro-West, Inc., and Earth Mechanics, Inc. (Fugro-Earth Mechanics). Proposed Foundation Description The foundation of the SFOBB main span-east pier and skyway structures will be founded on 2.5-meter-diameter, driv-en steel pipe piles that are approximately 70 meters to 95 meters (230 feet to 310 feet) long with non-uniform wall thick-ness schedules. The piles will be driven at a batter (1H:8V and 1H:12V), primarily to provide more lateral resistance and associated lateral foundation stiffness dur-ing ground shaking from a seismic event. PIDP Project Three piles were driven for the PIDP between Oct. 23 and Dec. 13, 2000, by Manson/Dutra (a joint venture of Manson Construction Co. and The Dutra Group) under contract to Caltrans. The piles were installed at two locations (designated the Primary Test Location for Pile Nos. 1 and 2 and the Pile No. 3 Test Location) (Continued On Page 30)...........
