roadheader การใช้

• A machine known as a " roadheader " slices through rock with forceful efficiency.
• The tunnels are usually excavated using a tunnel roadheader or a milling head attachment on an excavator.
• The spoils behind the roadheader conveyor belt are dumped on the invert and mucked out using a rubber-tired skid loader or a load-haul-dump ( LHD ) mining machine.
• The collapse forced evacuation of the Rideau Centre and the closing of a number of local streets and businesses; no one was injured or killed, but the nearly-completed tunnel was flooded, submerging a roadheader.
• The first roadheader patent was applied for by Dr . Z . Ajtay in Hungary, in 1949 . It was invented as a remote operated priapic miner for exploitation of small seam, close walled deposits, typically in wet conditions.