軽量鉄柱: 急傾斜層の安定出炭と機械化の進め方

抄録

Mayachi colliery is producing 2, 000-2, 100 tons of coking coal per day. Working coal seams are in the Yubari coal-bearing formation. The seams steeply inclined, i. e. 40°-80°. Mechanization of the coal mining has been hindered because of the steepness of the coal seams. Therefore, manpower has to play an important role especially in the coal producing faces. Latterly the number of young people joining the company has decreased. In addition to this, fairly long training periods are necessary forthe new workers in order to obtain enough knowledge of the mining operation under such special conditions. As a result, the average age of the workers is becoming higher and higher. It is forecasted that the constant coal production will become difficult in the near future. To solve this problem, a few counter measures have been conducted. One of the approaches to solve this problem is the application of light iron props made of aluminum alloy to reduce the fatigue of the workers. Another measure is the test of special boom type coal cutting machine which is a modified form of the road-header used for driving work. This report contains the abstracts of the above mentioned progresses and tests.