A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Surface miner speeding up construction at the Baregg tunnel
The construction of a third tube at the Baregg Tunnel (Switzerland) is made difficult by the fact that the tunnel leads through a geologically very problematic mountain ridge. In order not to jeopardise the traffic safety in the old tube, which was just 30 m distant, blasting was generally excluded. The solution for this problem (and other problems like transportation of the excavated material) was to use a 'Surface Miner 2100 SM' made by Wirtgen to excavate and directly load the material on trucks. With this method, the required volume of 500 m 3 can be achieved in one shift only by 55 dumper loads of 15 m 3 loosely tipped material each with one transport vehicle. During the excavation, the Surface Miner works on a slope with an inclination of approx. 1:10. At the selected cutting depth of 10 cm, a progress of 1 m when cutting over the profile width is achieved. Heavy dust development during milling is kept to a minimum, and the aggregate size of the excavated material is ideally suited for later reuse. Wirtgen offers six different cutting tool types for its range of Surface Miners, thus making it possible to precisely adapt the machine to the material to be mined. In addition to the diameter and shaping of the long-lived tungsten carbide tip, length and structural shape of the tool itself are crucial. Both, the shaft diameter and the spacing at which the tools are arranged on the cutting drum, contribute to a good cutting performance, while at the same time minimising wear and tear. When compared to a cold milling machine, the drum housing of a Surface Miner is of a much more robust and solid design, taking into account that it often excavates larger material slabs. To obtain the required static load the machine's operating weight has been increased by some tons. Special steel casings protect the crawler tracks of the machine from sharp-edged pieces of rock. An adapted design and reinforcement of the conveyor system and the crawler tracks complete the modifications of the machine.
Surface miner speeding up construction at the Baregg tunnel
The construction of a third tube at the Baregg Tunnel (Switzerland) is made difficult by the fact that the tunnel leads through a geologically very problematic mountain ridge. In order not to jeopardise the traffic safety in the old tube, which was just 30 m distant, blasting was generally excluded. The solution for this problem (and other problems like transportation of the excavated material) was to use a 'Surface Miner 2100 SM' made by Wirtgen to excavate and directly load the material on trucks. With this method, the required volume of 500 m 3 can be achieved in one shift only by 55 dumper loads of 15 m 3 loosely tipped material each with one transport vehicle. During the excavation, the Surface Miner works on a slope with an inclination of approx. 1:10. At the selected cutting depth of 10 cm, a progress of 1 m when cutting over the profile width is achieved. Heavy dust development during milling is kept to a minimum, and the aggregate size of the excavated material is ideally suited for later reuse. Wirtgen offers six different cutting tool types for its range of Surface Miners, thus making it possible to precisely adapt the machine to the material to be mined. In addition to the diameter and shaping of the long-lived tungsten carbide tip, length and structural shape of the tool itself are crucial. Both, the shaft diameter and the spacing at which the tools are arranged on the cutting drum, contribute to a good cutting performance, while at the same time minimising wear and tear. When compared to a cold milling machine, the drum housing of a Surface Miner is of a much more robust and solid design, taking into account that it often excavates larger material slabs. To obtain the required static load the machine's operating weight has been increased by some tons. Special steel casings protect the crawler tracks of the machine from sharp-edged pieces of rock. An adapted design and reinforcement of the conveyor system and the crawler tracks complete the modifications of the machine.
Surface miner speeding up construction at the Baregg tunnel
Oberflächenfräse beschleunigt den Bau eines Straßentunnels in der Schweiz
Bulk Solids Handling ; 22 ; 318-319
2002
2 Seiten, 2 Bilder
Article (Journal)
English
Engineering Index Backfile | 1927
Case Study "Surface Miner": Continuous Surface Miner in Indian Surface Coal Mining
British Library Online Contents | 2000
A COMPONENT FOR A CONSTRUCTION MACHINE OR A SURFACE MINER
| European Patent Office | 2016
Speeding exposition construction with explosives
| Engineering Index Backfile | 1935