π型钢梁在网下工作面中的应用

Application of π-beams in coal face under wire-mesh

作者较为详细地叙述了试用π型钢梁支护工作面的概况,回采工艺流程以及取得的技术经济效益。

trails of using π-beams in conjunction with hydraulic single props to support the roof under steel or plastic wire-mesh in Gushuyuan Colliery, Jincheng Mining Administration achieved good results. Practical experience showed that use of steel or plastic wire-mesh as an artificial roof could solve the problem of its sagging in the unsupported area. The average monthly output of a coal face increased by 132% as compared with coal face using friction hinged roof beams. The efficiency of crew increased by 103.8%. The rate of injury reduced by 71.1%. It increased the profit by over 8.76 million Yuan RMB in one year. The paper describes the face equipped with π-beams, the mining technology and techno-economic benefits.