Tunnel and Underground Space (터널과지하공간)

Korean Society for Rock Mechanics and Rock Engineering (한국암반공학회)
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Field Applicability of Coated Conical Pickcutters through Cutter Force and Wear Damage Analysis

보강된 픽커터의 커터작용력과 마모손상분석을 통한 현장적용성 검토

  • Soon-Wook Choi (Department of Geotechnical Engineering Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Soo-Ho Chang (Department of Geotechnical Engineering Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Chulho Lee (Department of Geotechnical Engineering Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Tae-Ho Kang (Department of Geotechnical Engineering Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Hoyoung Jeong (Department of Energy Resources Engineering, Pukyong National University)
  • 최순욱 (한국건설기술연구원 지반연구본부 ) ;
  • 장수호 (한국건설기술연구원 지반연구본부 ) ;
  • 이철호 (한국건설기술연구원 지반연구본부 ) ;
  • 강태호 (한국건설기술연구원 지반연구본부 ) ;
  • 정호영 (부경대학교 에너지자원공학과 )
  • Received : 2024.10.10
  • Accepted : 2024.10.15
  • Published : 2024.10.31
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Abstract

In this study, a field test was conducted to determine the effect of reinforcement around the insert on the wear damage of the pickcutter. Prior to the field test, a linear cutting test was conducted on the reinforced pickcutter and unreinforced pickcutter to determine the effect of the pickcutter reinforcement on the cutter force, and the capacity of the roadheader was checked based on the results. The cutter force analysis showed that the average normal force and cutting force were similar regardless of the reinforcement, but the maximum normal force and cutting force showed a large standard deviation depending on the reinforcement. From the torque review, it was determined that a depth of penetration of 6 mm or less using the average cutting force and 4 mm or less using the maximum cutting force was appropriate. In the wear damage analysis, the number of used pickcutters, the number of pickcutters with inserts retained, the number of cases of uneven wear, and the difference in weight between before and after use showed that the reinforced pickcutters outperformed the unreinforced pickers by 16% to 28%. From these results, we can conclude that pickcutter reinforcement has a significant impact on the durability of the pickcutter. However, the cost of reinforcing pickcutters is higher than that of unreinforced pickcutters due to material costs and additional processes, so it is necessary to consider the effect of performance improvement and cost.

본 연구에서는 삽입재 주변부 보강이 픽커터의 마모손상에 주는 효과를 파악하기 위한 현장시험을 수행하였다. 현장시험 수행에 앞서 보강 픽커터와 무보강 픽커터에 대한 선형절삭시험을 통해 픽커터의 보강이 커터작용력에 주는 영향을 확인하였고 그 결과를 기반으로 로드헤더의 용량검토를 수행하였다. 커터 작용력 분석 결과, 평균 연직력과 절삭력은 보강여부에 상관없이 유사했으나, 최대 연직력과 절삭력은 보강여부에 따라 표준편차가 크게 나타났다. 토크 검토에서 평균 절삭력을 사용할 경우는 관입깊이 6 mm 이하, 최대절삭력을 사용할 경우는 4 mm 이하가 적합한 것으로 산정되었다. 마모손상 분석에서는 각 픽커터의 사용개수, 삽입재가 유지되는 개수, 편마모 발생 개수, 사용 전과 후의 중량 차이에서 중량 손실을 제외하면 보강된 픽커터가 보강되지 않은 픽커터에 비해 16%에서 최대 28%까지 향상된 성능을 보여주었다. 이와 같은 결과로부터 픽커터의 보강이 픽커터의 내구성 향상에 상당한 영향을 미친다는 것을 확인할 수 있었다. 다만 픽커터의 보강은 무보강에 비해 재료비와 추가 공정에 의해 비용이 높으므로 성능 향상에 의한 효과와 비용문제를 고려하여 선정할 필요가 있다.

Keywords

Acknowledgement

본 연구는 한국건설기술연구원의 주요사업인 "최대 압축강도 100 MPa의 암반 굴착이 가능한 로드헤더용 픽커터 국산화 기술 개발(과제번호: 20240105-001)"의 일환으로 수행되었습니다.

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