三池炭鉱三川鉱の岩盤掘進について

抄録

The rock heading in Miike Colliery is a matter of great importance recognizing the fact of increased heading meters per thousand tons of coal produced, 9.54m in 1972 and 12.7m in 1981, and that the innovative progresses in this field have been required. The conventional heading techniques are based on the short hole firing system where the V-Cut using portable leg drills is prevalent for the pattern of centre cut. Miike Colliery, therefore, has made practical collaboration with the Coal Mining Research Centre in Mikawa Mine on the subject applying the long hole firing system. This report presents the improvements in drilling, blasting and loading techniques realized so far.