云南锡业公司所属第一矿第二分矿的革命职工试验成功坑内“水沟通风”,为矿山井下掘进作出了新贡献。“水沟通风”是利用一次成巷的大规格独头巷道掘进的水沟当作排风用的导风管(即水沟代替导风筒),使爆炸时产生的有害气体及岩尘通过局扇抽入水沟净化,从而达到通风目的。经在该矿两个重点工程施工中使用,证明 The revolutionary workers of the second sub-mine of Yunnan Tin Industry Co., Ltd. successfully tested the “gutter ventilation” in the pit and made new contributions to the underground excavation. “Ditching ventilation” is to use the ditches led by a large-sized single-lane roadway into an alley as an air duct for ventilation (that is, a ditch instead of an air duct) to allow harmful gas and rock dust generated during the explosion to pass Bureau fans pumping into the ditch clean, so as to achieve the purpose of ventilation. After the mine in the two key construction projects to prove that