|
The I-35W Mississippi River bridge (officially known as Bridge 9340) was an eight-lane, steel truss arch bridge that carried Interstate 35W across the Saint Anthony Falls of the Mississippi River in Minneapolis, Minnesota, United States. During the evening rush hour on August 1, 2007, it suddenly collapsed, killing 13 people and injuring 145. The bridge was Minnesota's second busiest,〔 Index map for Mn/DOT's 2006 traffic volumes; relevant maps showing the highest river bridge traffic volumes are Maps 2E, 3E, and 3F.〕 carrying 140,000 vehicles daily.〔 The NTSB cited a design flaw as the likely cause of the collapse, noting that a too-thin gusset plate ripped along a line of rivets, and asserted that additional weight on the bridge at the time of the collapse contributed to the catastrophic failure. Immediately after the collapse, help came from mutual aid in the seven-county Minneapolis-Saint Paul metropolitan area and emergency response personnel, charities, and volunteers.〔 Within a few days of the collapse, the Minnesota Department of Transportation (Mn/DOT) planned a replacement bridge, the I-35W Saint Anthony Falls Bridge. Construction was completed rapidly, and it opened on September 18, 2008. ==Location and site history== Located in Minneapolis, Minnesota's largest city, the bridge connected the Minneapolis neighborhoods of Downtown East and Marcy-Holmes. The south abutment was northeast of the Metrodome, and the north abutment was northwest of the University of Minnesota East Bank campus. The bridge was the southeastern boundary of the "Mississippi Mile" downtown riverfront parkland.〔Flanagan, Barbara. "Sheba the donkey is off Nicollet Island, but on pictorial map of it", ''Star Tribune'', August 26, 1988, Section:News; page 3B〕 Downstream is the 10th Avenue Bridge, once known as the Cedar Avenue Bridge. Immediately upstream is the lock and dam at Saint Anthony Falls, where Minneapolis began. The first bridge upstream is the historic Stone Arch Bridge, built for the Great Northern Railway and now used for bicycle and pedestrian traffic.〔(【引用サイトリンク】url= http://live.asce.org/hh/index.mxml?lid=158 )〕 The north foundation pier of the bridge was near a hydroelectric plant, razed in 1988. The south abutment was in an area polluted by a coal-to-gas processing plant and a facility for storing and processing petroleum products.〔 These uses effectively created a toxic waste site under the bridge, leading to a lawsuit and the removal of the contaminated soil.〔〔 No relationship between these prior uses and the bridge failure has been claimed. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「I-35W Mississippi River bridge」の詳細全文を読む スポンサード リンク
|