Underground Mine Roof Bolting

Brandon ooten in a west virginia coal mine running a fletcher roof ranger.

Underground mine roof bolting.

Position bolting machines and insert drill bits into chucks. Jennmar is the largest manufacturer of roof control products in the u s however we don t stop there. The introduction of roof bolting to u s. Underground coal mines 1948 1960.

Perhaps the most significant development in coal mine ground control during the last century was the introduction of roof bolting during the late 1940 s and 1950 s. Underground coal production tons longwall face continuous machine loaded handloaded figure 1. Pull down loose rock that cannot be supported. Basic geology mining methods and ground control hazards underground.

Underground coal mining methods of the 20th century. They also drill bolt holes into roofs at specified distances from ribs or adjacent bolts. A cautionary tale christopher mark chief rock mechanics section national institute for occupational safety and health. Today the fully grouted roof bolt is considered superior to the mechanical anchor bolt because of a better anchorage capacity and load transfer capability.

From an engineering standpoint roof bolts are inherently more effective than the wood timbers they replaced. Mining roof bolters operate machinery to install roof support bolts in underground mine. The mechanical anchor bolt the oldest design in use in underground coal mines was the main roof support used in the coal mining industry due to the rapid rate of installation. Use this google search link to find practically everything the web has to offer on roof bolting in powerpoint format.

Want more roof bolting powerpoints. A world leader in design and manufacture of roof drills bolters scaling machines drill jumbos and specialty equipment that improve safety and productivity in underground mines.