What is a roadheader in tunneling?
A roadheader, also called a boom-type roadheader, road header machine, road header or just header machine, is a piece of excavating equipment consisting of a boom-mounted cutting head, a loading device usually involving a conveyor, and a crawler travelling track to move the entire machine forward into the rock face.
How roadheader works?
Roadheaders can be used to create roadway cross-sections of any shape. To work the tunnel face, the roadheader is moved towards the face with the crawler tracks and the cutting head is set in motion. The face of the tunnel or roadway is then milled off in sections with the cutting head.
What is tunneling method?
In simple terms, tunnelling is the physical process of constructing an underground passageway beneath the earth’s surface, tunnels can also be created underwater. To be precise, a tunnel is a more or less a horizontal underground passageway constructed via excavation processes.
What is a roadheader used for?
The roadheader is a machine for excavating rock in mining and civil construction projects. It is a hybrid machine, with better manoeuvrability than that of tunnel boring machines.
How does a continuous miner work?
Continuous miners cut and gather the material simultaneously and convey it into shuttle cars, haul trucks or a continuous haulage system. They are typically used for full-scale production in room-and-pillar mining operations.
What is Shearer mining?
shearers cut away the face of a coal seam in longwall mining operations by mounting over an armored face conveyor (AFC). They are equipped with cutting drums positioned against the coal seam by ranging arms powered by hydraulic rams.
What are the purpose of tunneling?
Objectives: Tunnels are underground passages used for transportation. They could be used for carrying freights and passengers, water, sewage, etc Tunnels are more economical than open cuts beyond certain depths. Tunnels avoid disturbing or interfering with surface life and traffic during construction.
What is coal Plough?
[′kōl ‚plau̇] (mining engineering) A device with steel blades which shears off coal and pushes it onto the face conveyor.
What are continuous mining machines?
Operate self-propelled mining machines that rip coal, metal and nonmetal ores, rock, stone, or sand from the mine face and load it onto conveyors, shuttle cars, or trucks in a continuous operation.
Where is continuous miner used?
What does a longwall shearer do?
shearers cut away the face of a coal seam in longwall mining operations by mounting over an armored face conveyor (AFC). They can weigh more than 100 tons, travel at speeds up to 30 m/min, and cut away slices of coal seams up to 100 cm thick. They can also be called shearer loaders.