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介绍了机械回转扩大头钻孔灌注桩在凌钢 5 2 m2烧结室基础工程中的成功实践。并对钻头结构、原理、操作及事故预防与处理进行了阐述
The successful implementation of the mechanical rotary boring and expanding head bored pile in the foundation engineering of the 5 2 m2 sintering chamber in Linggang was introduced. And elaborated the structure, principle, operation and accident prevention and treatment of drills