作者: Gerhard Wehrmeyer

o. Prof. em. Dr.-Ing. Dr. h. c. mult. Bernhard Maidl was chair of construction method technology, tunnelling and construction management at the Ruhr-Universität Bochum. Currently, Prof. Maidl is partner at MTC – Maidl Tunnelconsultants Gmb H & Co. KG, Duisburg. Dr. Martin Herrenknecht is CEO of Herrenknecht AG, Schwanau. The company is technology and market leader in mechanised tunnelling. It is the only company in the world that offers the state-of-the-art tunnelling equipment for all soil types and in all diameters. Dr. Herrenknecht founded the company in 1977. Dr. Ulrich Maidl is general manager of MTC – Maidl Tunnelconsultants Gmb H & Co. KG, Duisburg and is a publically appointed and accredited expert for tunnelling and micro-tunnelling. Dr. Gerhard Wehrmeyer heads the Traffic Tunnelling division of Herrenknecht AG.