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滚刀钻头在特殊地层中的应用刘家荣，李洪，刘三意（地矿部勘探技术研究所河北廊坊１０２８４９）１工程概况徐州卷烟厂办公大楼工程基础设计直径１．ｌｉｎ钢筋混凝土灌注桩７５根，孔深２７～３０ｍ，入岩３ｍ。岩石为完整石灰岩夹有砂岩，可钻性为５～７级，覆盖层为土...
Application of hob bits in special formations Liu Jiarong, Li Hong, Liu Sanyi (Institute of Exploration Technology, Ministry of Geology and Mineral Resources, Langfang 102849, Hebei, China) 1 Project Overview Xuzhou Cigarette Factory Office Building Project Basic Design Diameter 1. Lin reinforced concrete cast-in-place pile 75 holes, hole depth 27 ~ 30m, into the rock 3m. The rock is a complete limestone with sandstone, drillability of 5 to 7 levels, covering the soil...