I-35W Saint Anthony Falls Bridge〜Construction崩落したI-35W橋は、事故後4ヶ月後に再建工事が始まり、去年 2008年9月に竣工した。橋の名称はI-35W St. Anthony Falls Bridgeと言い、 今度は、ポストテンション形式の鉄筋コンクリート橋(Post-Tensioned Precast Concrete box girder)である。 http://oxblue.com/archive/26ad48202aa6551f06c3c5532e18a86e/800x600.jpg 竣工開通後2009年冬の橋の全景 橋梁概要Official name I-35W St. Anthony Falls Bridge[1]Carries 10 Lanes of I-35W; light-rail or bus-way-ready[2] Crosses Mississippi River Locale Minneapolis, Minnesota, U.S. Maintained by Minnesota Department of Transportation (Mn/DOT) ID number NBI 27410 (Northbound), 27409 (Southbound) Design Post-Tensioned Precast Concrete box girder[3] Longest span 504 feet (154 m)[3] Total length 1,216 feet (371 m)[3] Width 180 feet (55 m)[2] Height 120 feet (37 m)[2])estimated Clearance below 70 feet (21 m)[3] AADT 1 41,000 (2005 estimates) http://projects.dot.state.mn.us/35wbridge/images/thumbnails/ElevationWithPiers.jpg 新橋梁の概要PDF このPDFファイルが素晴らしい、素人でも分かるように、この橋の構造から、建設方法、工事記録写真が満載されている。興味がある方は是非ダウンロードしてみて欲しい。工事期間Beginning date of construction October 30, 2007[1]Opening date September 18, 2008[4] Youtubeには建設記録の動画もUPされているMinnesota Public Radio reporter Dan Olson checks in on the progress of the construction of the new 35W bridge in Minneapolis それにしても驚かされるのは、この再建工事に関するミネアポリス道路交通局の情報開示の丁寧さだ。インターネットで微に入り細に入り計画概要から、工事計画、工事の途中の写真まで公開している。http://projects.dot.state.mn.us/35wbridge/images/tribune.jpg工事概要説明図 Support posts in construction on the north bank in January 2008Box girder sections formed in the casting yard in May 2008Last segment of northbound lanes in place July 5, 2008.Piers take shape on north shore in May 2008Bridge nearing completion, August 30, 2008.MnDOT maintained a project page that tracked all activities associated with the construction of the bridge including weekly updates, traffic impacts, construction photos, animations, and virtual walk tours. On December 17, 2007, the first slab of concrete, 200 feet (61 m) long, 13.5 feet (4.1 m) wide, and 4.5 feet (1.4 m) thick, was poured off-site, which begun to shape the bridge. Pilings sunk 100 feet (30.5 m) into the earth support the ends of the bridge,[24] which contains 50,000 yards (45.72 km) of concrete.[25] The bridge construction progressed more quickly than expected. Construction work was performed in shifts with as many as 400 workers during the day, and 200 at night.[26] On April 8, 2008 Mn/DOT announced the half way point of construction had been reached, and predicted that completion might be ahead of schedule by as much as three months.[27] This prediction was borne out by events, as the Minnesota Department of Transportation opened the bridge to traffic at 5:00 in the morning on September 18, 2008.[4] Minnesota State Patrol cars at both the north and south ends allowed rush hour traffic to build up behind them. Once the construction barricades were removed at 5:00 am the First Responders, State Troopers, and Mn/DOT trucks slowly crossed the bridge with rush hour traffic in tow, officially opening the bridge. Flatiron-Manson is expected to earn $27 million in bonuses for accelerated performance.[28]
日本の高速道路橋、あまたあれども、これほどの情報開示がなされている例を見たことがない・・・恐るべしアメリカ!!! |
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一昨年8/1突如崩落したミネソタの高速道路橋の再建工事記録を紹介しています。恐るべしアメリカ!!!
2009/8/26(水) 午前 4:21