Federal regulators said that the possible cause of the Minnesota bridge collapse in August 1, 2007 was that the thickness of the support plate was about half that of the corresponding thickness, killing 13 people and injuring 145.
Metal plates designed to strengthen the beam--
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According to the National Transportation Safety Commission, the 35W bridge on the Minni aporius River in Minnesota caused the collapse.
There are 111 cars in the collapsed part of the bridge, throwing 108 feet of them into 15-foot-deep river.
According to a report released by NTSB on Friday, the Commission's investigation found that 24
During the design and construction of the bridge, no "gusset" of the design was found in the comments ".
The bridge opened to traffic in 1967.
Due to years of modifications, the weight of the bridge has increased significantly, while the weight of the bridge has also increased due to construction equipment and Rush
The board said that the hourly traffic on the day of the collapse may be the cause of the collapse of the failed platform.
The Commission's investigation determined that other possible causes of the collapse, including the corrosion found on the board and the pre-existing cracks in the bridge beam, did not play a role in the collapse.
Mark V, acting president of NTSB, said: "We believe that this thorough investigation should eliminate any speculation about the root cause of this terrible accident and provide a road map for improvements to prevent future tragediesRosenker.
Several victims of the accident have filed a lawsuit against a consulting company and construction company that evaluated the bridge, whose equipment was on the bridge on the day of the collapse.
As a result of the investigation, the safety board made nine proposals to the Federal Highway Administration and the American Association of State Highway and transport officials, involving improving the way bridges are inspected and the way bridges are designed for review. All About I-
35W Mississippi bridgeS.