Posted Dec 9, 2010, 6:38 PM
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Droppin' Loads
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Join Date: Nov 2010
Location: Ventura, Santa Rosa, California
Posts: 288
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Quote:
East span of Bay Bridge to open months earlier
Michael Cabanatuan, Chronicle Staff Writer
Thursday, December 9, 2010
After years of delays, cost increases and complications on the $6.3 billion Bay Bridge project, finally there's some good news. The new east span will open to drivers traveling in both directions by the end of 2013 instead of the earlier plan to make eastbound motorists wait until 2014.
"We've found a way to open the whole bridge at once," said Bart Ney, a Caltrans spokesman. "It means seismic safety for everyone will arrive at least four to six months earlier."
It also means a complicated series of maneuvers - and traffic changes - to reconfigure the eastern end of the existing Bay Bridge in both directions so that a portion of the incline section can be cut away to make way for construction of the eastbound landing of the new bridge.
"It's going to be challenging, but nothing compared to some of the challenges we've already overcome," Ney said.
Those reconfigurations will bring changes in the alignments of the westbound approach to the existing bridge as well as the eastbound landing, both of which will take a turn to the south. The new eastbound alignment will probably premiere in May or June. The westbound change, which will include a temporary span, is likely to come at the end of 2011.
The cost of the changes has not yet been determined, Ney said, but should not cause the project to exhaust the $900 million contingency fund set aside to cover cost increases.
The accelerated timeline comes after bridge officials offered a package of incentives last December to speed fabrication of the bridge's steel deck and tower segments in China. The tactic apparently worked; steel deliveries have arrived on time or ahead of schedule, and the single tower that will support the suspension span is finally rising from the bay.
On Sunday, a new shipment of steel, including the third of five tower sections to be hoisted into place, will arrive, along with two more pieces of the bridge deck.
"We should be able to get most of the steel up before Christmas," said Peter Lee, program manager for the Bay Area Toll Authority. "It will raise the tower higher than the top of Yerba Buena Island."
The increased speed of the steel deliveries, combined with the changes on the east end of the bridge, will enable the span to open in December 2013, Ney said. For months, engineers have been working on plans to accelerate construction. Their design is complex, but essentially shifts everything to the south to make way for the eastbound landing of the new bridge to be built sooner than 2014. Some lane closures, and potentially a one-direction bridge closure, will be necessary, Ney said.
Work is already under way. Crews are relocating utilities to accommodate the traffic changes that will begin in 2011. Early in the year, access roads used by Caltrans crews and construction workers will be moved to the south.
In May or June, the eastbound lanes of traffic, after they come off the existing Bay Bridge, will also weave to the south. That will make way for crews to widen the incline section of the old bridge so a segment that blocks construction of the new landing can be cut away.
Once traffic is shifted onto that temporary span, again, curving south, construction of the eastbound landing, officially known as the "Oakland touchdown," can commence.
"The whole effort here," said Ney, "is to get the public on the new bridge, completely, as soon as possible."
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source: http://www.sfgate.com/cgi-bin/articl...MN9O1GNR6K.DTL
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