高压桥梁康复项目在7月31日继续为波士顿地区通勤者造成严重破坏，因为船员在跨越马萨诸塞州的Massachusetts I-90和Boston University附近的通勤轨道上的东行一侧安装了11个新的钢梁。
该项目团队在枪支下，随着通勤者与道路关闭，车道减少和关闭波士顿大学桥梁在密集的18.5天关闭期间争夺，因此船员可以不停地工作。约有30,000个司机跨越整个俗语的结构，作为“Comm Ave.桥梁”。另外26,000个马萨诸塞湾运输当局绿线乘客也穿过桥梁，而128,000到145,000之间drivers travel beneath the bridge on Massachusetts I-90 each day.
In the works since 2011, the bridge installation started on July 26 after major bridge components were fabricated off-site so crews could assemble them in place in a matter of weeks.
The $82 million project is expected to be completed by Aug. 14.
船员最终将更换劣化52岁历史桥梁的整个上部结构，包括实用程序重新定位，专用的自行车道和广泛的行人升级。这遵循去年完成的第二个子结构的两年康复。
Acting Massdot Highway Administrator Jonathan Gulliver在7月29日在新闻发布会上表示，“建设按照时间表运行”，截至周日早晨的举行，当拆迁超过三分之二的桥梁东行方面完成时。
Massdot正在与一般承包商沃尔什建筑合作，在设计 - 构建项目上施加，以取代结构上不透明但逻辑上的关键甲板和钢梁桥。
两阶段项目的第一阶段涉及取代桥梁的东行车道和MBTA绿线轨迹甲板。根据Massdot的说法，Westbound部分将于明年夏季完成，最后完成2018年12月的最终完成。
"Phase 1 is more extensive since we have to take up Green Line track, replace the girders underneath and rebuild the whole Green Line in the area of the bridge," says Michael McGrath, construction deputy chief engineer for the MassDOT highway division.
The team has been focusing on "managing logistics surrounding the construction site since the project impacts all modes of transportation," Gulliver says.
他还指出，“为了最大限度地减少风险，我们正在接地上的桥接元件的更多系重，并且使用比我们通常部署的更大的起重机在更大的碎片中将所有东西达到更大而不是做贴在桥上。“
Accelerated Bridge Construction methods are helping shorten the duration of onsite construction. Two 400-ton hydraulic cranes will be operating on the bridge and one 440-ton hydraulic crane down on I-90, says Chuck Labbee, MassDOT resident engineer. Similar to the "Fast 14" bridge replacement project that replaced 14 Medford, Mass., bridges in 2011, self-propelled modular transporters are being used to move heavy bridge structure.
The bridge girders are 90 ft to 150 ft in length and 36 in. to 80 in. in depth, weighing 30 to 80 tons, with some delivered in pairs weighing up to 160 tons, Labbee says.
Walsh will use precast concrete elements and rapid-set concrete, and construct the deck panels off-site for positioning when needed.
用于工作的东行和西行阶段的排序包括使用I-90交叉将流量移动到I-90的Westbound侧，拆除现有跨度并安装新跨度并安装新跨度通勤轨和I-90东行。
While originally scheduled to begin in summer 2016, McGrath says the project was delayed due to fabrication factors and the decision to avoid a fall start date to avoid disrupting returning university students.
