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文章分析了徐州局掘进与巷修顶板事故率高的原因， 介绍了外注式单体液压支柱升柱器的结构特点、设计原理和操作工艺， 总结了升柱器在巷道修护中的应用效果。
This paper analyzes the reasons of the high accident rate of tunneling and alley roof in Xuzhou Bureau, introduces the structural features, design principles and operation techniques of the external column props, and summarizes the application effect of the riser in roadway repair .