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        Double Shield Tunnel Boring Machine

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        A tunneling shield is a protective structure used in the excavation of tunnel. Shield used for the tunneling purpose are - single shield, double shield or integrated shield. It is the geology or the nature of the rocks and the soils that decides the kind of the shield for usage.

        Double shielded tunneling boring machines are normally used in unstable geology, or where a high rate of advancement is required. They are also used for the workers protection in soft and unstable rocks. Double shielded machines are also used to install a tunnel lining.

        Double Shield Tunnel Boring Machine Behind the shield, there are various support mechanisms which are part of the tunnel boring machines like dirt removal, slurry pipelines, control rooms, rails for transport of the precast segments, etc. Apart from this there are other equipments like rotating cutting wheel, chamber hydraulic jacks etc that helps the machine for the excavation processs.


        The applications of all boring machines are nearly same. The difference lies only in geology where they are applied. Followings are their applications :

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