Oakland Bay Bridge - Construction Solutions
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Allnorth Consultants was responsible for the construction solutions at the Self Anchorage Span (SAS) of the San Francisco–Oakland Bay Bridge; the concept, design and engineering of the Pushing Frame, Crossbeam Erection Gantry and the 1500-tonne Lifting Frame. During the construction, deck segments (weighing up to 1500 tonnes) are lifted onto scaffolding using the Lifting Frame. The scaffolding provides pedestals with Teflon pads for sliding where the segments are pushed into position by the Pushing Frame, followed by the Crossbeam Erection Gantry that slides crossbeams longitudinally while cantilevering its nose 30-meters beyond the scaffolding before planting the Gantry Support onto the opposing deck to slide the crossbeams transversely into their final position. The difficulties of these tasks are magnified by the weight of the deck segments and the changing of C.G. from segment to segment. The cables which are used during the lifting process are 9 part 3" braided cables. Imperfections in the length of individual strands of cable makes the lifting process a highly non-linear problem where the elongation of strands and the rotation of blocks has to be taken into account in the load redistribution process. Advanced structural analysis and construction sequencing were required for the project in conjunction with analysis software including SAP2000, SolidWorks and COSMOS.
Client: American Bridge/Fluor Enterprises Inc.
Responsibilities: Design and engineering of lifting frame, crossbeam erection gantry and pushing frame.
Project Location: San Francisco-Oakland, California, USA
Project Delivery: 2013
Project Cost: $1,450,000,000
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