Roof Bolts In Coal Mines

Mining roof bolters operate machinery to install roof support bolts in underground mine.

Roof bolts in coal mines.

Independent front and rear lift for easy tramming on uneven bottom. Roof bolts in helping to create a stable rock structure are the first line of defence to protect mineworkers from fall of ground related hazards which highlights the importance of correct roof. They also drill bolt holes into roofs at specified distances from ribs or adjacent bolts. The traditional dead weight loading design.

We can supply the construction mining or tunneling industry with much more. Roof bolts promised to dramatically reduce the number of. Cable bolting is sometimes used as primary support in coal mines experiencing difficult roof conditions. Short operating length allows bolting the first row of an intersection from one set up.

Low version of fletcher s rr ii with machine height as low as 25 635m. Wide boom swing allows multiple bolt installations from one chassis position. Roof bolting is hard work where miners often have to lift cumbersome pieces of heavy metal into awkward positions. In low seam mines the flexibility of the cable bolts allows greater length supports to be installed near the advancing face without the use of couplers.

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. Low profile roof ranger ii. High roof conditions can present a problem for people who usually work with low profile machines and vice versa. From an engineering standpoint roof bolts are inherently more effective than the wood timbers they replaced.

Take a look at our capabilities and affiliates to learn more. However ground falls still remain a significant factor in underground coal mine injuries and fatalities. Jennmar is the largest manufacturer of roof control products in the u s however we don t stop there. Position bolting machines and insert drill bits into chucks.

The coal mine roof rating cmrr somewhat quantifies this effect through the strong bed adjustment 9. When conditions change and the miners are out of their element safety can become a concern.