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日本金属矿业实业团,在长栋地区三井金属矿业(株)神冈矿业所茂住矿北翼,以距茂住井口2,146.5米的位置为起点,到1979年度工程结束,共掘进1,880米水平大巷(距井口约为4,030米).这期间随着巷道的延伸,遇到了风量不足、岩体温度升高的难题,作业环境也恶化了.面对这种情况,在实施彻底改善的通风对策之前,曾从距井口约600米的主风流分岔点开始,每隔200米安设一台3.7千瓦的小型轴流式扇风机,配以(?)600毫米维尼龙柔性风筒供风.但由于风筒漏风量增大、扇风机台数增加,通风效率很低,有效风量减少了.
Japan Metal Mining Industry Group, starting from the location of 2,146.5 meters from the Mau Sum wellhead in the northern wing of Mauzha Mine of Kamioka Mining Co., Ltd. in Matsumoto Metal Mining Co., Ltd. in Changdong Area, ended the project in 1979 by excavating a 1,880-meter-wide main road About 4,030 meters away from the wellhead.) In the meantime, with the extension of the roadway during this period, it encounters the problem of insufficient air volume and temperature of the rock mass, and worsens the working environment. In the face of such a situation, before implementing a thoroughly improved ventilation strategy, Starting from the main bifurcation point about 600 meters away from the well head, a small 3.7-kilowatt axial fan was installed at a distance of 200 meters and was supplied with a (?) 600mm Vinyl duct. However, due to Air duct leakage increases, fans increase the number of units, ventilation efficiency is low, the effective reduction of air flow.