城郊煤矿副井井筒深度为550m,井架为撸式钢井架,井架总高度为36.8m,支撑总质量约224t。由于受井筒表土层解冻下沉及绞车重负荷运动频率的影响,副井井架2支腿座混凝土受压裂变,致 The shaft depth of the auxiliary shaft in Chengjiao Coal Mine is 550m. The derrick is a steel derrick. The total derrick height is 36.8m, and the total supporting mass is about 224t. Due to the influence of thawing and sinking of wellbore topsoil and heavy-load movement frequency of the winch,