Aimed at resolve the several problems which affect drilling efficiency, such as balling up and calcareous cementation , the design of blade bits was modified. And the results of the modification are satisfying.
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王文明,吴初兴.东海大桥主墩大直径钻孔灌注桩钻头设计[J].钻探工程,2004,31(12):30-32.WANG Wen-ming, WU Chu-xing. Bit Design for Main Pier Bored Piles of Donghai Bridge[J]. Drilling Engineering, 2004,31(12):30-32.