For fast underground construction of slot holes with small diameters within highway tunnels, Herrenknecht is highlighting its Boxhole Boring Machine.
The BBM is for slot holes, or boreholes, such as ventilation shafts, either inclined or vertical, with diameters of up to 1.5m and lengths of up to 60m. The machines are designed for stable rock with compressive strengths of 180 Megapascal or more.
Herrenknecht, based in Schwanau, southwest Germany, uses pipe jacking technology for its BBM. A drilling un