Tag Archives: Bridge

Tobin Bridge rates ‘fair’ in corrosion reports

State-issued inspection reports released on Friday in the wake of a corroded light fixture tumbling onto a ramp of the Maurice J. Tobin Memorial Bridge show that the 62-year-old structure is in “fair” condition with some “severe” structural deficiencies.

The structure of the bridge, which is currently undergoing a $45 million repainting and rehabilitation, was downgraded from a rating of 6, or “satisfactory”condition, in a 2009 state Department of Transportation inspection report to a 5, or “fair” condition, in its most recent 2011 report.

“We base our inspections on the overall rating of the bridge. While some elements of the structure are showing greater signs of wear … the structure as a whole is sound,” said MassDOT spokeswoman Cyndi Roy. “If the rating were to decrease to a 4 (or poor) we would then begin annual inspections of the bridge, versus the current schedule of every two years — the national standard.”

The area where the bridge deteriorated the most from 2009 and 2011 was in its girders and beams, now rated as having “severe/major deficiency.” Deteriorated and cracked concrete parts of the bridge’s substructure columns also were given the same “severe” rating in both the 2009 and 2011 reports.

“It’s not totally unacceptable to have some level of corrosion, especially given the bridge’s location right on the harbor, where the mist and salt lend to creating some corrosion,” Roy added.

The DOT released the bridge reports after holding a press conference to announce that crews overnight Thursday removed seven spotlights from the bridge after one of the lights — there are total of 18 on the bridge — broke free from a bracket under the Tobin’s upper deck and came crashing down onto an approach ramp to Route 1 in Charlestown.

SOURCE: http://www.bostonherald.com/news/regional/view/20220721tobin_bridge_rates_fair_in_reports/

Mercier Bridge inspections reveal alarming decay

Quebec has released long-awaited inspection reports on Montreal’s Mercier Bridge that confirm rapidly accelerating decay in the aging structure forced its closure earlier this summer.

Corrosion noted in a 2011 inspection was so advanced that some bridge parts were perforated and deformed, the reports say.

In particular, the report said, 10 gusset plates that hold beams in an interlocking pattern are severely eroded.

Of 346 bridge parts inspected, 86 were given a “1” rating, meaning that they were deemed “incapable of perfoming required task.”

The 2011 report was dated June 11, and the Transport Ministry banned most traffic from the bridge three days later, citing the need for critical repairs to remedy safety-threatening corrosion and rust.

But Transport Minister Pierre Moreau was quick to point out that long-term repairs to remedy decay were underway when the span was shut down.

“The deterioration was going at a faster rate than what we expected,” but the bridge was in no danger of collapsing, Moreau said at a news conference Monday.

All emergency repairs have been completed, but other work is in progress.

The Mercier Bridge partially reopened Sept. 6, with remaining lanes scheduled to open in December if all repairs are completed.

The summer closure angered South Shore residents, officials and business owners who rely on the Mercier Bridge for daily commutes into the city.

The Transport Ministry has released inspection reports from 2007, 2008, 2009 and 2011 on its website.

The Mercier Bridge comprises two structures, one built in the 1930s and another inbound arm built in the 1960s.

SOURCE: http://www.cbc.ca/news/canada/montreal/story/2011/09/19/mercier-bridge-inspection-reports-released.html

‘Significant corrosion’ on Stillwater Lift Bridge

STILLWATER, Minn. — Temporary load restrictions begin Thursday for the Stillwater Lift Bridge after the discovery of significant corrosion on some of the bridge’s components.

The Minnesota Department of Transportation (Mn/DOT) says crews discovered the corrosion during a regularly scheduled inspection.

“Although the bridge can safely handle day to day traffic, heavy loads will wear the bridge out more quickly,” said Mn/DOT state bridge engineer Nancy Daubenberger. “Restricting the loads before and during the repairs will help prevent damage to the bridge.”

The temporary posting will reduce the legal load limits as follows:

· Single truck, from 28 tons to 24 tons
· Semi-truck, from 40 tons to 28 tons
· Trailer truck, from 40 tons to 28 tons

Mn/DOT crews are expected to begin work on the bridge later this week. Repairs should be finished in one week to 10 days.

Meantime, supporters of a new bridge say this latest development only strengthens their case for going forward with construction.

“It’s yet another wake-up call that we need a new bridge.  It’s an 80-year-old bridge.  July 1st it celebrated its 80th birthday.  You can keep pouring money into it, but it’s going to keep deteriorating,” said Stillwater Mayor Ken Harycki.

Just this week, Gov. Mark Dayton denied a request by 30 environmental groups to consider a plan for a much smaller bridge on the St. Croix river.

Dayton and bridge supporters have argued the latest plan — calling for a $690 million, four-lane bridge — would cause the least harm and enjoys the widest support.

Dayton has said he wants Congress to approve the project by late September or he’ll consider shifting more than $360 million in federal and state funds to other projects. Congress needs to pass an exemption to the U.S. Wild and Scenic Rivers Act.

The bridge is also scheduled for a repair project in fall 2012.

SOURCE: http://www.kare11.com/news/article/934635/396/Significant-corrosion-on-Stillwater-Lift-Bridge

Verrazano-Narrows Bridge paint job will extend span’s lifespan

It’s not going to be Vincent Van Gogh’s “Starry Night,” but the $19 million paint job on the Verrazano-Narrows Bridge will put corrosion in check and extend the span’s life.

The scheduled two-year project began late in 2010, but workers for the contractor just started stripping the old lead-based paint in July, said MTA spokeswoman Judie Glave.

The work also includes repairing and rehabilitating corroded steel, then finally applying three fresh coats of a special high performance paint designed for bridges to the interior and exterior of the tower legs on the Staten Island and Brooklyn sides,” Ms. Glave said.

Islanders might have noticed a wrapping around the bridge legs, which is a containment system comprised of tarps that will catch the lead paint chips safely to keep it out of the environment, Ms. Glave explained.

The collected paint chips are then disposed of in “strict accordance with New York State regulations,” Ms. Glave said.

The work was included in the current 2010-2014 capital budget and funded through toll collections and TBTA (Triborough Bridge and Tunnel Authority) bonds, not requiring any state or federal money, Ms. Glave said.

Barges positioned in the water near Staten Island’s bridge tower will allow workers to use abrasive blasting to strip away the old paint, and there will be no traffic impact from this project, Glave added.

“Regular attention to painting steel on bridges is critical to keeping them in a state of good repair and to provide a protective coating against corrosion,” Ms. Glave explained. “The Verrazano-Narrows is particularly susceptible to corrosion because of the wind patterns where it sits in the bay and the bridge’s exposure to harsh sea and salt air.”

Corrosion on the Verrazano varies depending on the area of the bridge and its exposure to the elements.

Some of the areas contractors will be working on are the original paint, while other parts were repainted in the late 1980s, Ms. Glave said.

In 2010, about 188,000 vehicles per day traversed the bridge, Glave added. 

SOURCE: http://www.silive.com/news/index.ssf/2011/08/v-n_bridge_paint_job_will_exte.html

Bridge collapse “linked to excessive Four Rivers dredging”

www.hani.co.kr reports that dredging to expedite operations around a pier allegedly exposed a Korean bridge to corrosion which ultimately led to its collapse.

The Waegwan Railroad Bridge in Yangmok Township, Chilgok County, North Gyeongsang Province (also known as the “Bridge of National Defense”), after standing solidly for the last hundred years, collapsed in light monsoon rain.

The bridge, which, after being built across the Nakdong River in 1905, had withstood not only major typhoons such as Maemi and Sara but also the greatest Korean flood in the 20th century, in 1925, is a registered modern cultural property.

The bridge collapsed at around 5.15am on June 25. The Nakdong River had swollen due to rain that had been falling since June 22, when the bridge’s second pier suddenly collapsed, leaving a 100m stretch of the bridge stuck in the water.

Several thousand people cross the bridge, now used by pedestrians only, every day, but the fact that the collapse occurred in the early hours of the morning meant that there were, luckily, no injuries.

“It appears that this occurred because of heavy rainfall, which led to higher water levels and a higher rate of flow,” the Ministry of Land, Transport and Maritime Affairs (MLTM) said on June 25 regarding the cause of the accident.

At the time of the collapse, dredging as part of construction for the Four Major Rivers Restoration Project was in full swing. The swollen water was forming eddies above the riverbed, into which dredgers had dug deep. The rapid currents hit the piers supporting the bridge hard. It appears that the pier had been weakened.

“This is because dredging for Four Major Rivers Restoration Project had taken place around the pier, just like everywhere else. If the riverbed is excavated to a significant depth around a pier, the base of the pier is exposed and begins to be eroded by the flowing water,” the report claimed.

Protective work to reduce corrosion had not taken place, moreover, on the second pier. An environmental impact assessment and reinforcement plan for Waegwan Railroad Bridge submitted by Busan Regional Construction Management Administration (BRCMA) stipulate that construction work to shore up all seven piers of the bridge must take place.

“Last year, when we ran out of places to process the huge amounts of dredged matter, we reduced dredging volumes and the plans for dredging around Waegwan Railroad Bridge were also changed,” said an official at BRCMA. “We made the judgment that there was no need to shore up the second pier because the plans to dredge around it were canceled.”

Despite the changed plans, BRCMA did not notify the local environment office at Daegu. The work went forcibly ahead with no assessment of safety and the river brought down the second, and weakest, pier.

Park Chang-kun, professor of civil engineering at Kwandong University, said, “The construction work went forcibly ahead in order to meet the deadline, with no alternative sought despite an important change in plans.”

SOURCE: http://www.sandandgravel.com/news/article.asp?v1=14773

Corrosion under the Lincoln Street Bridge is prompting the City of Wichita to begin building a new bridge

Lincoln Bridge Closing Disrupts Local Fishermen

“I know they’ve got to do their job but it’s going to affect a lot of the good fishing down through there,” said Kenneth Snell, with a fishing rod in one hand, ready to fish south of the Lincoln Street Bridge.

Fishermen along the Arkansas River were not looking forward to finding new spots to make a catch.

“This is the best spot. The heads are taking it down from us but we could wait. We don’t have no other choice,” said Snell.

The 40-year-old bridge is located above a dam that has been wearing down the support and steel. City engineers said patching up the problems would be too costly.

“Even though the existing bridge could be repaired, we’ve done an economical analysis and found that it was more economical to construct a new bridge and then move the current dam out from underneath,” said Jim Armour, city engineer for the City of Wichita.

The new dam will be moved about 200 feet downstream from its current location. Engineers said the new dam will help stabilize river levels upstream.

“Although this won’t completely eliminate any flooding upstream, it’ll reduce the occasions of that,” said Armour.

Starting Monday, engineers will lower river levels. This is something engineers said will be helpful in the long-run.

“The citizens will see a lot more stability in the river level upstream once the new dam is completed,” said Armour. “I think this bridge will have a service life of 50 to a hundred years.”

Although fishermen didn’t like the move, they said they’re looking forward to a new bridge.

“Whenever they do get through it, I know it’ll look nice,” said Snell.

The Lincoln Street Bridge will be closed to pedestrians and motorists starting Monday. Traffic will be detoured using Harry Street, McClean Boulevard, and both Main and Market Streets.

The project is expected to be complete by the fall of 2012.

SOURCE: http://www.kake.com/news/headlines/Lincoln_Bridge_Closing_Disrupts_Local_Fishermen_123719869.html