Practice of Drainage Hole Construction in Shaft by Air DTH Drilling Technology
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Huaibei Mining Group Exploration Engineering Co., Ltd.,Huaibei Mining Group Exploration Engineering Co., Ltd.,Huaibei Mining Group Exploration Engineering Co., Ltd.,Huaibei Mining Group Exploration Engineering Co., Ltd.,Huaibei Mining Group Exploration Engineering Co., Ltd.

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P634

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    Abstract:

    Large amount of working face gushing water was encountered in the bedrock section of air shaft in Yuandian 1st coal mine, the drainage capacity could not meet the needs of excavation and lining. In order to ensure the safety of shaft excavation and lining, rapid releasing by direct drilling to air shaft was proposed, but the conventional mud drilling could not be used. By long-distance suspended drill pipe with air DTH hammer drilling technology, conductor pipe installation and some other construction technologies and measures, the technical difficulties of rock powder returning upward, too large water pressure, drill pipe swinging and some others have been effectively solved, the drainage hole construction is completed smoothly, the gushing water in bedrock section is discharged into the underground sump.

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History
  • Received:July 25,2016
  • Revised:May 09,2017
  • Adopted:May 15,2017
  • Online: July 21,2017
  • Published: