吉林大学学报(工学版) ›› 2016, Vol. 46 ›› Issue (3): 845-852.doi: 10.13229/j.cnki.jdxbgxb201603025

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Development and test of GQ-142 hollow-through DTH air hammer used in multilayer goaf drilling

GAN Xin1, 2, YIN Kun1, 2, LI Peng1, 2, LUO Yong-jiang1, 2   

  1. 1.College of Construction Engineering, Jilin University, Changchun 130026, China;
    2.Laboratory of Technology for Drilling under Complex Condition of Ministry of Land and Resources, Jilin University, Changchun 130026, China
  • Received:2015-04-21 Online:2016-06-20 Published:2016-06-20

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Abstract: In order to resolve the problem of multilayer goaf drilling and measurement, a new method, which adopts reverse circulation drilling technology with hollow-through DTH air hammer to pass through multilayer goaf is proposed, and a GQ-142 hollow-through air hammer is developed. The main performance parameters of the GQ-142 hollow-through DTH air hammer are computed using the program of “hollow-through DTH air hammer computational simulation and analysis” which is written in VB language. Analysis results show that the rated air pressure is 18×105 Pa, the rated air consumption is 14.86 m3/min, and the single impact energy is 413.07 J. A field test using GQ-142 hollow-through DTH air hammer to pass through multilayer goaf is carried out. Testing results show that, using DTH air hammer, the impact effect of rock fragmentation is obvious and the average drilling efficiency is 13.08 m/h. Using the GQ-142 hollow-through DTH air hammer and C-ALS 3D laser scanner can successfully pass through and measure the two layers of goaf.

Key words: mine safety, multilayer goaf, hollow-through DTH air hammer, reverse circulation drilling, computational simulation, C-ALS 3D scanning

CLC Number: 

  • TD41
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