The Shaft Boring Roadheader (SBR) was developed for the mechanized sinking of blind shafts in soft to medium-hard rock. In contrast to the Shaft Boring Machine (SBM) with an installed hard rock cutting wheel, the SBR has been equipped with a roadheader boom and a rotating cutting drum. This allows the cutting of variable shaft diameters from 8 to 12 meters. Based on the proven technology of the Herrenknecht Shaft Sinking Machines (VSM), the new development offers higher occupational safety compared to conventional processes and, at the same time, high tunnelling performances.
Proven basis for new developments
The Shaft Sinking Machines (VSM) developed by Herrenknecht have already proven their worth in numerous applications. Based on these project experiences, the SBR was equipped with a special roadheader boom and a rotating cutting drum to meet the needs of the mining sector. The boom is telescopic and allows the excavation of the entire shaft cross-section with a depth of one meter in a single operation. The SBR does not need to be moved vertically during this cutting process.
In the first step of the cutting cycle, the cutting drum creates a cut of up to 200 millimeters in depth. Subsequently, more circular sections are cut clockwise from the shaft center to the shaft wall. After each of these 5 cycles, the shaft cross-section is one meter deeper. Then, the SBR is lowered and the cutting cycle begins again. The loosened rock is removed from the shaft bottom via a pneumatic mucking system. The shaft wall is secured with shotcrete from an upper working deck.
With the further development of existing technologies and with its in-depth engineering expertise, Herrenknecht opens up new fields of business. Innovative machine concepts are needed in order to explore deposits at great depths safely and efficiently, especially in the mining sector.
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