Optimum operating conditions of a multi-hammer drilling machine assessed using a linear percussion test

To minimize social cost and to avoid existing obstacles (e.g., buildings, buried pipes, rivers, and ocean), cable and electricity tunnels are constructed mainly using trenchless technology. We have developed a new method for micro-tunnel excavation using a multihammer drilling machine and identified...

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Published inInternational journal of precision engineering and manufacturing Vol. 16; no. 7; pp. 1415 - 1422
Main Authors Ryu, Sunghoon, Cho, Jung-Woo, Park, Jin-Young, Lee, Jae-Wook, Jeong, Myeong-Sik, Song, Chang-Heon, Kim, Jung-Gyu, Song, Jae-Joon
Format Journal Article
LanguageEnglish
Published Seoul Korean Society for Precision Engineering 01.06.2015
Subjects
Engineering
Industrial and Production Engineering
Materials Science
Trenchless technology
Linear percussion test
Multi-hammer drill
Micro-tunnelling
Optimum operating condition
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ISSN2234-7593
2005-4602
DOI10.1007/s12541-015-0186-y

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Summary:To minimize social cost and to avoid existing obstacles (e.g., buildings, buried pipes, rivers, and ocean), cable and electricity tunnels are constructed mainly using trenchless technology. We have developed a new method for micro-tunnel excavation using a multihammer drilling machine and identified the optimum operating conditions of the system. A linear percussion testing system was constructed to acquire rock drilling data. The tests were conducted under various air pressures and RPMs consistent with field conditions. Three classes of rock specimens in terms of strength (i.e., hard, medium, and moderate rock) were tested. The test results yielded the optimum operating conditions of the multi-hammer drilling machine according to rock strength.
ISSN:2234-7593
2005-4602
DOI:10.1007/s12541-015-0186-y