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在软弱多变的地层中开挖隧道是造价昂贵、技术复杂的工作。意大利开发出安全而又有竞争力的方法,把Sandvik的TUBEX钻孔系统与小导管注浆稳定地层的丰富经验结合起来。 传统的小管棚法,是在松软粘性土中钻出直径为
Excavating tunnels in weak and variable formations is costly and technically complex. Italy has developed a safe and competitive approach that combines Sandvik’s TUBEX drilling system with the rich experience of small duct grouting in stable formations. The traditional method of small tube shedding is in loose clay in the drilling diameter