直到3月16日,一切都在艾伯塔省埃德蒙顿的Groat Road上的新桥上非常顺利。两天前,制造商和勃起最高钢的工作人员放置并螺栓固定了将完成跨度的七个中央围栏部分中的第一个。风中断了一段时间的工作,但是到周日晚上,船员恢复了围栏的位置,直到六个部分开始。然后,在3月16日星期一凌晨2点15分左右,四个梁侧面弯曲,三个偏转了几英尺,并使室内括号弯曲或悬挂。工作停止,危机管理开始。

艾伯塔大学结构工程助理教授卡洛斯·克鲁兹·诺格斯(Carlos Cruz Noguez)说:“我们看不到这类失败。”

The girder deflection, which Cruz Noguez and other engineers attribute to torsional lateral buckling, is shown in many photos, taken by an internet- enabled jobsite project camera. "It's visually amazing," said Cruz Noguez.

埃德蒙顿(Edmonton)的道路设计和建筑经理巴里·贝尔科特(Barry Belcourt)似乎在随后的日子里承受的压力大于惊奇,这是由于格罗特路(Groat Road)关闭而导致的交通延迟,该路在跨度下运行。

The Edmonton Journal reported that Belcourt told the media on Tuesday, March 17, that the delay was his responsibility, saying, "And we should have the pressure on us. ... It's my responsibility to deliver this project. You think we sleep at night? No. The team I'm working with and the contractors, we're embarrassed by this."

The project's contracting team, which includes the Los Angeles-based contractor AECOM and Calgary-based Graham Construction, declined to comment, citing restrictions placed on them by the city. Edmonton-based Supreme Steel also declined to comment.

得益于建筑团队的快速工作,该团队将衬套和起重机移到了结构的钩部,以及钢的弹性性质,梁伸直。到4月7日,跨度下的交通再次流动。

Whether the contracting team will end up footing the bill for the as-yet- unspecified delays is a multimillion-dollar question. City officials declined to reveal details of contractual penalties for late completion, which originally was set for October. The construction team already has been penalized $15,000 for each day that Groat Road was closed; the total fine exceeded $300,000.

Initial Budget

The new bridge had an initial budget of $32 million. The span stretches roughly 100 meters over Groat Road; the banks on each end were stablized with soil nails. The bolted, three-section girders are roughly 4.2 meters deep at their ends, which are encased in concrete abutments.

根据城市工程官员的说法,施工人员实际上是在3月13日星期五晚上开始安装大梁的,但由于大风而不得不在周六晚上停止工作。

They are overseeing a review of the project by Vancouver-based bridge engineer Buckland & Taylor. City officials say the range of causes being probed includes the high winds that forced girder erection to stop on Saturday night, girder bracing and erection procedures.