据Sound Transit官员称，有史以来第一次将轻轨轨道安装在浮桥上，这是90 Homer M. Hadley Memorial Bridge，将西雅图连接到Bellevue，这是37亿美元的East Link Extension的一部分。将并排的1英里长的固定轨道并排在多个飞机上移动的桥上，不仅需要数年的测试，而且还需要一种新的施工方法。
Solutions included a lighter-weight track system, reducing the risk of electrical current going astray and a first-ever land-to-bridge connection.
“It has gone pretty dang well,” says John Sleavin, Sound Transit deputy executive director.
首先，与基维特（Kiewit）和霍夫曼（Hoffman）合资企业的船员通过后张紧和钢筋进行了改装。“总的来说，这创造了一项非常复杂的几何练习，以确保结构改造，锚，轴承板和桥梁都排成一列，” Sound Transit Practit Practer Construction Manager Sepehr Sobhani说。
Running 300-ton trains across the accordion-style joints required eight “track bridges” that include a 43-ft curved platform that can move in such a way to keep tracks safe, akin to a three-legged stool where the tracks rest on a platform that has pivoting bearings connected to a hinge. Items sitting on three points always find a plane, no matter which direction the floating bridge rotates and pushes. The connections self-level to support the track at the joint in a continuous alignment.
索巴尼说：“轨道桥必须与浮动桥相对于过渡跨越的浮动桥的运动相关，以确保桥梁的每个运动都由轨道桥构成，”铁轨。”
Crews use 9,000 light concrete blocks to act as rail ties. The setup requires a plastic drip cap and a rubberized layer to prevent electricity from coming off the block into the bridge. Because crews couldn’t drill into the bridge, they used a special epoxy, Dex-G, to attach the units to the bridge deck.
声音运输worked with the University of Washington to explore how the epoxy reacted and then tested it in the contractor’s yard to practice putting on the blocks, controlling the Dex-G flow. “There was a lot of process that went in advance of even getting out there because this is a unique construction method,” Sleavin says. “We spent a lot of time with the contractor and that helped us negotiate the price and understand the real hours of work it would take to put this stuff on.”
Surveying on a floating bridge provided challenges, coupled with tight tolerance by using precast plinths that “didn’t leave much room for error,” Sobhani says. Crews surveyed off bridge points, not a satellite. The bridge includes a cross-slope for drainage, but since the precast pieces are flat, crews needed to prep the deck to create flat spots.
在5月1日开始的9,000个街区的安装。所有街区将在9月底之前在桥上上演，以适当地对冬季前的桥梁重量。Sleavin预计在2020年夏末冬季冬季冬季的好天气延伸期间将继续附着块。
桥梁合同的民事工程计划于2020年11月之前结束，东链接项目将于2022年在2023年测试火车。
