Journal of Korean Tunnelling and Underground Space Association (한국터널지하공간학회 논문집)

Korean Tunnelling and Underground Space Association (한국터널지하공간학회)
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Development of disc cutter wear sensor prototype and its verification for ensuring construction safety of utility cable tunnels

전력구 터널 건설안전 확보를 위한 디스크커터 마모측정시스템 시작품 개발 및 성능검증

  • Jung Joo Kim (Power System Research Laboratory, KEPCO Research Institute, KEPCO) ;
  • Hee Hwan Ryu (Power System Research Laboratory, KEPCO Research Institute, KEPCO) ;
  • Seung Woo Song (Tunnel and Machine) ;
  • Seung Chul Do (DOONA Information & Technology) ;
  • Ji Yun Lee (Power System Research Laboratory, KEPCO Research Institute, KEPCO) ;
  • Ho Young Jeong (Dept. of Energy Resources Engineering, Pukyong National University)
  • 김정주 (한전 전력연구원 전력계통연구소) ;
  • 류희환 (한전 전력연구원 전력계통연구소) ;
  • 송승우 ((주)티엔엠) ;
  • 도승철 ((주)두나정보기술) ;
  • 이지윤 (한전 전력연구원 전력계통연구소) ;
  • 정호영 (부경대학교 에너지자원공학과)
  • Received : 2024.01.24
  • Accepted : 2024.03.11
  • Published : 2024.03.31
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Abstract

Most of utility cable tunnels are constructed utilizing shield TBM as part of the underground transmission line project. The TBM chamber is the only space inside the tunnel that encounters rock and soil, and is the place with the highest frequency of accident exposure, such as collapse and collision accidents. Since there is currently no way to measure the disc cutter wear from outside the chamber, frequent inspection by workers is essential. Accordingly, in this study, in order to prevent safety accidents inside the TBM chamber and expect the effect of shortening the construction period by reducing the number of chamber openings, the concept of disk cutter wear measurement technology was established and a prototype was produced. By considering prior technology and determining that magnetic sensors are most suitable for the excavation environment, wear measurement sensor package were developed integrating magnetic sensors, wireless communication modules, power supply, external casing, and monitoring systems. To verify the performance of the prototype in an actual excavation environment, a full-scale tunnelling test was performed using a 3.6 m EPB shield TBM. Based on the full-scale tests, five prototypes were operated normally among eight prototypes. It was analyzed that sensor measurement, wireless communication, and durability performance were secured within a maximum thrust of 3,000 kN and a rotation speed of 1.5 RPM.

전력구 터널은 송전선로 지중화 사업의 일환으로 대부분의 경우 쉴드 TBM을 활용하여 건설된다. TBM 챔버는 터널 내부 중 유일하게 암반과 흙을 마주하는 공간이며, 붕락과 부딪힘 사고 등 사고노출 빈도가 가장 높은 곳이다. 현재 챔버 외부에서 디스크커터 마모정도를 측정할 수 있는 방법이 부재하기 때문에 근로자의 수시점검이 필수적이다. 이에 본 연구에서는 TBM 챔버 내부 안전사고를 예방하고, 챔버 오픈회수 절감을 통해 공사기간 단축의 효과를 기대하기 위하여 디스크커터 마모측정 기술 개념을 정립하고, 시작품을 제작하였다. 선행기술을 고찰하여 자기센서가 굴착환경에서 가장 적합하다고 판단하여, 자기센서, 무선통신 모듈, 전원공급, 외부 케이싱, 그리고 모니터링 시스템을 종합한 마모측정 센서 패키지를 개발하였다. 실제 굴착환경에서 시작품 성능검증을 수행하기 위해 3.6 m 토압식 쉴드 TBM을 활용한 실대형 굴진시험을 수행하였다. 실대형 굴진시험 결과 8개의 시작품 중 5개가 정상적으로 작동하였다. 최대 3,000 kN의 추력과 1.5 RPM의 회전속도 안에서 센서측정값이 무선통신을 통해 시스템에 원활하게 표출되는지 확인하였고, 센서 케이싱이 파손되지 않아 내구성을 확보하는 것으로 분석되었다.

Keywords

Acknowledgement

본 연구는 한국전력공사 자체연구개발 과제(R22SA01) '전력구 공사 안전확보를 위한 디스크커터 마모측정 및 수명예측 기술 개발'의 지원으로 수행되었습니다. 연구지원에 감사드립니다.

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