Glossary.

Structure in the form of a shaft or a pit where the tunnelling ends, designated for the recovery of the tunnelling machine.

Longitudinal cutterhead mounted on a special boom for partial face excavation.

Sealed connection between a stationary and a rotating component. Usually used for a number of fluids such as hydraulic oil for various components, bentonite suspension or foam. The largest rotary coupling on a tunnel boring machine is located in the transition area to the rotating cutting wheel.