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Large-Diameter DTH Drill Rig
Author(s): 
Pages: 18-20
Year: Issue:  1
Journal: ZHAOYAN JIXIE QIDONG GONGJU

Keyword:  large-diameter DTH drill rigDTH hammercasing pipeeffective rock cracking;
Abstract: The paper highlights technical specifications, construction, operation, technical features of the largediameter DTH drill rig as well as benefits of the DTH method and the application of the drill rig. It solves technical prob-lem of "effective rock cracking" during the drilling of the large, deep holes and provides a construction method for the construction at complex formations, serving as a reference for the design, use and popularization of the large-diameter DTH drill rig
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