________________ For the conventional construction of shafts in hard rock Herrenknecht has developed the new Shaft Drilling Jumbo on the basis of tried and tested mechanized tunnelling technology. The modular jumbos are constructed in line with specific customer needs and can be used with shaft diameters of up to 12 meters. The optimized logistics in the shaft lead to process acceleration, an increase in cost efficiency and at the same time to a reduction of potential hazards for the personnel.
Optimized technology on the basis of tried and tested components
Herrenknecht has been using specialized drilling rigs for rock support or geological exploration in tunnel boring machines of all diameter ranges for more than 15 years. The many years of experience with these drilling rigs was incorporated into the development of the new Shaft Drilling Jumbo. The goal from the beginning was to achieve improved performances connected with high work safety for the machine personnel. These prerequisites could be implemented successfully thanks to special adaptations for vertical shaft sinking operations.
The Shaft Drilling Jumbo is used in projects where other methods are reaching their technical or economic limits. Despite its project-specific construction, the machine allows different configurations and flexible drilling patterns and can be used both for blind shafts and shafts with a pilot hole.
High sinking performance, high work safety
In a first step, the system is sunk centrally into the shaft and braced with its stabilizers hydraulically to the shaft wall. The subsequent drilling cycle is carried out manually or automatically and with all booms at the same time. This minimizes down-time and increases the drilling performance and work safety. Once a drilling cycle has been completed, the Shaft Drilling Jumbo is folded together and lifted up to the surface with a winch. Then the blasting cycle follows. The loosened material is transported either up to the surface in buckets or down to the lower level through a pilot shaft. Following that, primary rock support using rock bolts, shotcrete or steel arches is carried out from an independent working platform. At the same time, the Shaft Drilling Jumbo is already excavating the next drill pattern. In this way, 2-3 meters of shaft can be achieved per work shift, and the complete cycle itself takes less than 4 hours.