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Explorer
A person traveling to and from work
Cone-shaped part of a TBM which is located behind the cutterhead, which is able to crush larger stones for removal due to its special form and rotation.
A shield modified for use in subaqueous tunnels in which the working pockets can be closed when "shoving blind".
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Rock having joints or cleavage spaced and oriented in a manner such that it readily breaks into loose blocks under excavation conditions.
A star or chisel pointed tip forged or screwed (detachable) to the end of a drill steel.
Filling voids immediately after placing lining
Also : CONTACT GROUTING
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The Herrenknecht method allows the trenchless jacking of a prefab pipe or pipeline in one step with concurrent excavation of the drill hole. The excavation of the soil is carried out with a microtunnelling machine. The pipeline is pushed forward by the Pipe Thruster; transmitting the thrust force, required for drilling, to the cutterhead.
A guidance system that automatically tracks and displays the direction of the TBM and facilitates accurate steering by the TBM operator.
Top of the arch of a tunnel
A dimensional line in a tunnel, outside of which excavation is not paid for;. May also be referred to as the "pay line"