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据工程新闻记录报报导,华盛顿国家运输部正号召对美国最大横断面的软土隧道投标.隧道圆周内径的直径为63英尺,据信,要用第一流的工程技术修筑。并且承包契约中包括一些减轻危险的条款,这是在开挖隧道的业务中,很久就提过建议的。从西雅图的商业区到华盛顿湖之间,横互巴克尔山岭,1500英尺的隧道即通过山岭,州际三层隧道即占有90英尺。估计造价六千万到八千万美元之间。为了西向1—90的运输量,隧道将有三车道行车道。为了高车位占用率的车辆,下方将是变向车道。上方是人行及走脚踏车的小路。一对现存的二车道隧道,将加以改建和更新为三车道东向行车车道。
According to the engineering news paper, Washington State Department of Transportation is calling for bidding for the largest cross-section soft soil tunnel in the United States, with a 63-foot inside diameter and believed to be built using state-of-the-art engineering. And the contract of contracting includes some mitigating provisions which have been proposed for a long time in the tunnel excavation business. From Seattle’s business district to Lake Washington, across the Buckler Mountains, a 1,500-foot tunnel passes through the mountains and interstate three-level tunnels occupy 90 feet. Estimated cost of 60 million to 80 million US dollars between. The tunnel will have a three-lane driveway for west 1-90 traffic. For vehicles with a high occupancy rate, the lane below will be a turnaround. Above is the path of walking and cycling. A pair of existing two-lane tunnels will be converted and renovated into a three-lane eastbound carriageway.