Glossary.

The center part of a shield. Used as thrust cylinder support.

Crush Lining Machine. The machine is deployed for the reconstruction of existing pipelines or the extension of existing pipeline diameters. During pipe jacking, the pilot head guides the pipeline alongside the original route. The cutter head removes the old pipeline material (crush lining procedure).

TBM, equiped with a pressure bulkhead behind the excavation chamber. An over-pressure can be created in the excavation chamber, if needed, in order to compensate the existing earth pressure and/or (ground) water pressure. Among others AVN, AVND and EPB belong to the group of closed tunnelling machines.

Truck trailer for mobile HDD equipment. The functions of mixing, pumping and recycling are rapidly ready for operation on the construction site.

Installation for the transfer of persons and/or material inside and outside the atmospheric area of the tunnel into the pressurized area. Enables access to the tunnel face for the exchange of tools or removal of obstacles. In general, it is built into the front part of the TBM.

Grounds rarely have all characteristics required for the use as support medium in EPB-shield (EPB) operation mode and must therefore be conditioned. During the conditioning process, the natural ground is therefore conditioned to act as a plastic support medium. Depending on the particular geology, conditioning is possible by adding water, bentonite, polymer or foam.

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.

Work station of the machine operator. Either aboveground in the control container (if remote controlled) or directly inside the machine.

A tool which grinds the excavated material down to a conveyable grain size.

Tool support of hard rock machines equipped with disk cutters for full-face excavation. For small diameters, disk-type cutterheads with muck buckets are sometimes employed and the cutter change is carried out from the front (frontloading). For middle to large diameters, drum-type cutterheads incorporating muck channels are normally used. This cutterhead type is equipped with backloading disk cutters.

Disk-shaped or spoke-type tool carrier for a full face cutting machine mainly equipped with soft ground tools, used to excavate heterogeneous grounds.