Glossary.

Herrenknecht Combined Shield; TBM which can switch between different operation modes, e.g. between TBM and EPB mode. This enables the deployment of the machine in very different geologies.

Horizontal Directional Drilling is a multistage, horizontal drilling procedure in trenchless pipeline construction. With the help of HDD rigs, mainly gas and oil pipelines are installed in the soil.

Specially formed excavation tool on a longitudinal cutting head.

Excavation tool in the form of a hydraulically operated hammer for partial face excavation.