Showing posts with label Bay Bridge. Show all posts
Showing posts with label Bay Bridge. Show all posts

Wednesday, October 28, 2009

A piece of steel and cable fell from San Francisco's Bay Bridge on Tuesday.






The Bay Bridge closure had Marin roadways clogged in the early-morning hours Wednesday as commuters packed Highway 37 and the Richmond-San Rafael and Golden Gate bridges.

Marry Currie, spokeswoman for the Golden Gate Transit District, said from midnight through 6 a.m. there were big increases every hour in the number of cars on the Golden Gate Bridge compared with the same times a week earlier.

The extra traffic wasn't as significant from 7 to 8 a.m., Currie said, because "people were stuck upstream trying to get to the bridge."

She said the number of commuters on early-morning Larkspur ferries was up by about 60 riders per ferry; officials ran an extra trip to help compensate.

Commuters reported Highway 37 traffic was "barely moving" both into Marin Wednesday morning and exiting Marin Tuesday evening.

California Highway Patrol said traffic flow through Marin Wednesday morning was heavier than normal.

"If I grade it from a 1 to 10, it's about a 7," said Tom Reimer, a volunteer with the Marin CHP office.

Jamie Lomanto, a parking officer with the Sausalito Police Department, reported that his commute from Santa Rosa was OK at about 6 a.m. Wednesday, but northbound traffic Tuesday night was a different story.

"Last night I definitely noticed it though, going home," he said.

Caltrans officials Wednesday morning were unable to provide estimates of when the bridge would be reopned. Crews worked through the night on a portion of the bridge's eastern span that had been repaired over the Labor Day weekend but fell apart at 5:30 p.m. Tuesday.

"We're working on it," said Bob Haus, Caltans spokesman. "The high winds are not making it easy. We have to take the safety of the workers into account here."

Haus said Wednesday morning's heavy traffic on both the Richmond-San Rafael Bridge and the San Mateo Bridge was "about what we expected."

He said at 8:45 a.m., it was taking 26 minutes longer than normal to get from Berkeley to San Rafael across the Richmond-San Rafael Bridge.



The San Francisco - Oakland Bay Bridge has been closed in both directions, after pieces of the cantilever section fell during the late-afternoon commute. The SF Chronicle reports that authorities said the pieces were two high-strength rods and a support saddle that were part of the emergency repair work done during Labor Day weekend.

The San Francisco - Oakland Bay Bridge was shut down over Labor Day weekend for seismic retrofit repairs. Crews slid an entire section of the bridge out and slid a new one in. However, during an inspection of the bridge, crews discovered a cracked support strut (pictured) that forced extra repairs and caused the bridge to open hours later than originally planned.

To fix the cracked strut, crews wrapped a custom-made steel saddle, which acted like a brace around a person's knee, around the link to redistribute stress away from the area. That was attached to another saddle, set lower down the Bay Bridge span with steel tie rods.

When the crack was first found, crews said that the bridge would have to remain closed until the crack was repaired. With the original repair gone, crews are back to square one.

The parts of the span's overhead steel support structure fell around 5:30 PM. Three vehicles were hit by the debris, and the passengers in one vehicle were shaken up but not injured.

Although no statement has been made about the timespan for the closure, if indeed it were the fixed portions from the Labor Day repair that failed, based on the previous estimates during the Labor Day weekend, it would seem that it will be days before the bridge is repaired.

An indefinite closure of the Bay Bridge would severely impact the Bay Area commute.

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RELATED POSTS:-

Tuesday, September 8, 2009

Crack Found in Bay Bridge Postpones Its Reopening ,repair forces longer closure


The old Bay Bridge and the new route bridge can be seen side by side.


In this frame from video provided by Caltrans, construction workers place a buckle over a cracked eyebar on the eastern portion of the Bay Bridge on Monday, September 7, 2009. Repairs continue on a portion of the San Francisco-Oakland Bay Bridge for Labor Day weekend beginning Thursday, September 3, 2009.



Workers on the eastern span of the Bay Bridge reinforce a cracked eyebar discovered while the bridge was closed.


California Transportation Department workers survey a cracked steel link, called an eyebar, that helps hold up the Bay Bridge's east span. Sept 7, 2009.


Saddle is installed to distribute the weight to the rest of the eyebars and prevent further widening of the crack , can be seen just below the saddle.


Location of the crack and the saddle with the tie beams.


A replacement section slides into place connecting the new detour route during the San Francisco-Oakland Bay Bridge seismic retrofit in San Francisco, Saturday, Sept. 5, 2009. The bridge is closed over the Labor Day weekend and expected to reopen before morning rush hour Tuesday.


Click the image above to inlarge image. Show the replacement re route bridge and segment.


The crack can be seen , right of below one of the eye beam of the Bay Bridge. The crack give an sufficient worries to the engineers.

The Bay Bridge will remain closed until at least Wednesday morning as crews work nonstop to repair what's been described as a "significant" crack in the bridge's east span near Yerba Buena Island.

The bridge had been shut in both directions since Thursday night as part of a major seismic project, and had been expected to reopen for today's morning commute.


However, the surprise discovery Saturday of a large crack in a steel beam forced emergency repairs requiring the bridge to remain closed.

"We know this is going to be a major inconvenience for Bay Area commuters, but this should not overshadow the tremendous work that was completed this weekend," Caltrans Director Randell Iwasaki said.

The bridge is the most heavily used in the state, typically handling 248,000 vehicles a day, Caltrans officials said.

Bay Area officials made a point of saying workers and other travelers should be able to get into San Francisco.

"Our advice is to take transit and be patient," Goodwin said. "You'll get there. The city is open for business."

The bridge had been closed through the Labor Day weekend to allow crews to cut away a 300-foot section of the bridge and slide a new section into its place, at an angle, linking to a new detour route at Yerba Buena Island.

State bridge inspectors on Saturday found a significant crack halfway through a 2-inch-thick beam called an eyebar on the bridge's cantilever section. An eyebar is a straight bar with a hole at each end connecting to other bridge parts.

The crack was not related to the weekend work, officials said, and appears to have occurred since a 2007 inspection. Officials said the crack was serious enough to have required a bridge closure had the bridge not already been closed for the seismic project.

"We are fortunate this was discovered when so many experienced contractors and skilled workers were on the scene, able to respond immediately," said Bob Alvarado of the California Transportation Commission.

Support pieces were rush-ordered Saturday from an Arizona company. The pieces were manufactured and sent to the Bay Area on Sunday.

"This repair had to be designed on the fly," Goodwin said. "They are having to fit the pieces together."

The stress load at that section of the bridge had been taken up safely by seven similar beams, officials said, but the damaged beam needs to be fixed. The repair essentially involves placing a metal splint around the broken piece.

Caltrans officials warned drivers that when the bridge reopens, speed limits at Yerba Buena Island will be reduced from 50 to 40 mph to accommodate two turns on the detour route.

Those two turns allow space for construction crews to build the new bridge directly toward the island's tunnel.

Unlike the existing east span, which is a double-deck bridge, the new bridge will be a set of side-by-side bridges, and will include a single suspension tower.

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