DOI QR코드

DOI QR Code

Development of Inspection Robot for Removing Snow on Stays of Cable-Stayed Bridge

사장교 케이블의 잔설 제거용 점검 로봇 개발

  • Kim, Jaehwan (Sustainable Infrastructure Research Center, Korea Institute of Civil Engineering and Building Technology) ;
  • Seo, Dong-Woo (Sustainable Infrastructure Research Center, Korea Institute of Civil Engineering and Building Technology) ;
  • Jung, Kyu-San (Sustainable Infrastructure Research Center, Korea Institute of Civil Engineering and Building Technology) ;
  • Park, Ki-Tae (Sustainable Infrastructure Research Center, Korea Institute of Civil Engineering and Building Technology)
  • Received : 2019.11.11
  • Accepted : 2020.03.06
  • Published : 2020.03.31

Abstract

Safety accidents have been reported due to falling accumulated snow from cables of cable-supported bridges. In addition to the direct damage caused by falling snow, secondary damage, such as traffic accidents, can occur. Various methods have been proposed to prevent these accidents, but there are still problems in safety and practicality. In this study, a cable robot type was selected as one of the active methods for removing accumulated snow on cables. An attempt was made to increase the climbing ability of the robot to improve the efficiency of snow removal. In addition, the available range of cable diameter for the robot can be adjusted flexibly to be applied to cables used in the field. A high-resolution camera was also installed to check the surface condition of the cable in real time to increase the utility, and be used as a cable inspection robot. A three-axis accelerometer and a tension conversion algorithm were added to measure the tension force of cables. To verify the performance, indoor and field experiments were conducted, and future improvements for the inspection robot were proposed.

국내외적으로 케이블지지 교량에서 케이블의 착설 및 잔설 등이 낙설됨에 따라 안전사고가 발생하고 있다. 낙설에 의한 직접적인 피해뿐만 아니라 교통사고 등 추가적인 2차 피해가 발생하고 있어, 이에 대한 대책 마련이 필요하다. 이를 예방하기 위한 다양한 방안들이 제시되고 있지만, 안전성과 실용성에서는 여전히 문제점을 가지고 있다. 본 연구에서는 기존 방법 중 능동적인 잔설 제거 방법 중 하나인 케이블 로봇을 활용하고자 하였고, 잔설 제거의 효율을 높이기 위하여 로봇의 등반 능력을 높이는 다양한 방법이 적용되었다. 교량 케이블의 다양한 직경에 적용할 수 있도록 로봇의 가용 범위를 유동적으로 조절할 수 있게 하였다. 또한, 케이블 잔설 제거 로봇의 활용성을 높이기 위하여 케이블의 표면 상태를 실시간으로 점검할 수 있도록 고해상도 카메라를 설치하고, 장력 측정을 위하여 3축 가속도계와 장력 변환 알고리즘을 추가하여 잔설제거 뿐만 아니라 겨울철 이외에도 케이블 점검 로봇으로 활용될 수 있도록 개발하였다. 성능 검증을 위하여 실내 및 현장 실험을 수행하였고, 향후 점검 로봇에 대한 개선사항에서 대해서도 제안 하였다.

Keywords

References

  1. KSCE, Specification on Design of Cable-supported bridge, Technical Report, Korean Society of Civil Engineers, Korea, 2006.
  2. J. H. Roldsgaard, A. Kiremidjian, C. T. Georgakis, M.H. Faber, "Preliminary probabilistic prediction of ice/snow accretion on stay cables based on meteorological variables," Proceedings of 11th International Conference on Structural Safety & Reliability Conference, ICOSSAR 2013, New York, USA, Jun. 2013.
  3. KICT, A study on systematic maintenance for offshore bridge, Technical Report, Ministry of Land, Infrastructure and Transport, Korea, pp.179, 2017.
  4. K. Kleissl, C. T. Georgakis, "Bridge ice accretion and de- and anti-icing systems: A review," Proceedings of the 7th International Cable Supported Bridge Operators' Conference, ICSBOC 2010, Jiangsu, China, pp. 161-167, 2010.
  5. L. Nutthavit, Ice Prevention and Weather Monitoring on Cable-Stayed Bridges, Master's thesis, The University of Toledo, Ohio, USA, 2014.
  6. H .J. Jung, T. H. Yang, B. S. Jang, "Field application of a robotic system on cable stays of Incheon Bridge for snow removal," Proceedings of 28th International Symposium on Automation and Robotics in Construction, ISARC Seoul, South Korea, pp. 1415-1416, Jun. 2011.
  7. J. H. Kim, K. H. Lee, C. H. Son, Y. P. Kim, Plan and Design of Dongi 1st Bridge, Technical Report, Yooshin, pp. 312-327, 2010.