一简述我局在设计革命运动中,对过去机务高架卸煤线设计提出了一些意见,如圬工量大,投资多,不切合实际等。同时几年来我局自行设计的高架卸煤线类型也有好几种。在计算上受规范的框框较多,脱离实际,如内摩擦角用φ=30°,而若选择透水性较好材料,夯压密度达90%以上时,(?)=35°,两方面综合起来其比值 A brief overview of our design revolution movement in the past, the design of overhead coal handling unloading line made some suggestions, such as large amount of labor, more investment, impractical and so on. In the meantime, there are several types of overhead unloading lines designed by our bureau in the past few years. In the calculation of the norms of the box more, from the actual, such as the internal friction angle with φ = 30 °, and if the choice of material with good water permeability, ram pressure density of 90% or more, (?) = 35 °, both Taken together, its ratio