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六十年代中期,新奥法(NATM)在欧洲广泛应用,后来其他国家和地区,包括远东、日本、中国和南非也开始采用这种方法进行隧道施工。过了较长的时间后才在美国开始使用。虽然已确切地证明新奥法在技术上是优越的,使用上是经济的,而美国了解和接受它的原理却很慢。当奥地利承包商llbau在1984年得到一个小的转包工程,即在匹兹堡的来巴农山体中开挖长755米双线单轨铁路隧道后,新奥法在美国的应用才有了突破。紧接这个工程Ilbau在华盛顿又成功地承包了一个工程,即惠顿站地铁红线路的扩建。在承接此工程之后,Ilbau就表示,如果用新奥法代替美国隧道工程的常规施工法,不仅工程造价低得多,而且可得到不用灰浆的隧道。
In the mid-1960s, NATM was widely used in Europe. Later, other countries and regions including the Far East, Japan, China and South Africa started to use this method for tunnel construction. It took a long time before it started to be used in the United States. Although it has been accurately demonstrated that the new Austrian law is technically superior and economical to use, the United States understands and accepts it very slowly. When Austria contractor llbau received a small subcontracting project in 1984, excavating a 755-meter two-lane monorail tunnel in the Baronshan Mountains in Pittsburgh, a breakthrough was found in the application of the new Austrian law in the United States. Immediately after this project, Ilbau successfully contracted a project in Washington to expand the red line at Whittier Metro. After undertaking this project, Ilbau said that if the new Austrian law instead of the conventional construction method of the United States tunneling project, not only the project cost is much lower, but also get a mortarless tunnel.