Tunnelling machines - shield machines, thrust boring machines, auger boring machines, lining erection equipment - safety requirements.

隧道掘进机。盾构机止推钻孔机螺旋钻探机衬里安装设备。安全要求。

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In the above image, one of the huge tunnel-boring machines is shown just as it breaks through to one of the completed sections of the tunnel.

上图显示的是一台巨型隧道掘进机在工作，两条隧道正在贯通。

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Theregion's unpredictable geology and its volcanic rock prevented engineers from using boring machines, forcing them to blast and dig their way under the Tsugaru Strait.

该地区不可预知的地质环境和火山岩结构迫使工程师放弃使用钻孔机，而是通过爆破在津轻海峡挖掘出一条通道。

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Boring machines will dig twin 1.6-mile (2.6km) tunnels under the River Thames.

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The work is in stark contrast to the relatively quick and modern techniques which we have filmed being used with the Tunnel Boring Machines at the other end of the line.

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