The world's longest tunnel will take shape deep beneath the Swiss Alps on Friday when a giant drilling machine clears a path for a key high speed railway through the heart of Europe.
在巨大的钻孔机清理出一条小道后，横贯瑞士阿尔卑斯山下方世界上最长的隧道终于成形。这条隧道将建设成为穿过欧洲心脏地带的高速铁路通道的关键路段。
The measures to control construction quality are analyzed, which are used to drill deep holes with normal circulation slewing drilling machine.
分析了正循环回转钻深孔施工的施工方法和要点，提出了施工监理的监理质量控制点及注意事项。
The measures to control construction quality are analyzed, which are used to drill deep holes with normal circulation slewing drilling machine.
分析了正循环回转钻深孔施工的施工方法和要点，提出了施工监理的监理质量控制点及注意事项。
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