近20年来,国外隧洞掘进机制造业有了迅速的发展。应用掘进机的工程越来越多。据初步统计,生产的各种型号的掘进机已有300多台,用于20多个国家的约250项工程上,累计掘进隧洞长度约达2,000公里。掘进机目前的技术发展水平是:开挖直径为1.8～11米;适应岩石抗压强度为2,000～2,500公斤/厘 In the past 20 years, the overseas tunnel boring machine manufacturing industry has witnessed rapid development. The application of boring machine engineering more and more. According to preliminary statistics, there are more than 300 tunnel boring machines of various types manufactured for approximately 250 projects in more than 20 countries. The total length of tunneling tunnels is about 2,000 km. The current level of TBM development is: excavation diameter of 1.8 to 11 meters; to adapt to rock compressive strength of 2,000 to 2,500 kg / PCT