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

Korean Tunnelling and Underground Space Association (한국터널지하공간학회)
권호 표지
DOI QR코드

DOI QR Code

Monitoring of waterjet cutting free surface using laser sensor

레이저 센서를 이용한 워터젯 절삭 자유면 모니터링

  • Oh, Tae-Min (KAIST, Department of Civil & Environmental Engineering) ;
  • Hong, Chang-Ho (KAIST, Department of Civil & Environmental Engineering) ;
  • Cho, Gye-Chun (KAIST, Department of Civil & Environmental Engineering)
  • Received : 2013.07.23
  • Accepted : 2013.08.23
  • Published : 2013.09.30
Download PDF
⟨ Previous Next ⟩

Abstract

The monitoring of a free surface generated by waterjet cutting technology is very important for an efficient construction process. In this study, experiments using a laser sensor were performed to provide a data processing method and to determine optimized parameters. The experimental parameters here are the angular resolution, measurement distance, and free surface cutting shape. The results show that the monitoring resolution increases with a decrease in the angular resolution and the horizontal measurement distance and with an increase in the cutting (free surface) width. This laser monitoring method can be applied during the measurement of free surface shapes and depths in situ.

워터젯 절삭기술을 이용한 자유면 생성에 있어서, 생성된 자유면 내부의 모니터링은 효율적인 작업 진행을 위해서 매우 중요하다. 본 연구에서는 레이저 센서를 이용하여 자유면 측정 실험을 수행하고 실질적 현장적용을 위한 변수의 영향 정도와 최적변수 범위를 제시하였다. 영향을 미치는 변수를 레이저의 분해각(angular resolution), 측정 이격거리(measurement distance), 그리고 자유면의 절삭형상(cutting shape)으로 나누어 실험 수행 및 결과 분석을 하였다. 그 결과 분해각과 측정 이격거리가 감소할수록 그리고 절삭 폭이 증가할수록 보다 정밀한 모니터링이 가능함을 확인할 수 있었다. 본 레이저 측정 시스템을 이용하면 자유면 형상과 깊이의 측정이 실제 현장에서 충분히 적용 가능할 것으로 판단된다.

Keywords

References

  1. Kim, I.S., Lim, S.B. (2007), "A study on 3D section profiling surveying in tunnel excavation using a laser scanner", Journal of the Korean Society of Civil Engineers, Vol. 27, No. 4D, pp. 541-546.
  2. Kim, J.G. (2012), "Reduction of blasting-induced vibration in tunnelling using abrasive water jet notch and disc cutting", Ph.D. Dissertation, Seoul National University, pp. 57-62.
  3. Lee, K.H., Heo, I.W., Kim, D.H., Lee, I.M. (2011), "The construction management of tunnel using 3D laser scanner", Journal of the Korean Tunnelling and Underground Space Association, Vol. 13, No. 3, pp. 159-176.
  4. Oh, T.M. (2012), "Rock excavation using abrasive waterjet", Ph.D. Dissertation, KAIST, pp. 93-115.
  5. Oh, T.M., Cho, G.C. (2012), "Effects of geometric parameters of a combined nozzle for rock cutting using an abrasive waterjet", Journal of the Korean Tunnelling and Underground Space Association, Vol. 14, No. 5, pp. 517-528. https://doi.org/10.9711/KTAJ.2012.14.5.517
  6. Oh, T.M., Cho, G.C., Ji, I.T. (2013), "Effects of free surface using waterjet cutting for rock blasting excavation", Journal of the Korean Tunnelling and Underground Space Association, Vol. 15, No. 1, pp. 49-57. https://doi.org/10.9711/KTAJ.2013.15.1.049
  7. Park, D.H., Jeon, B.K., Jeon S.W. (2009), "A numerical study on the screening of blast-induced waves for reducing ground vibration", Rock Mechanics and Rock Engineering, Vol. 42, pp. 449-473. https://doi.org/10.1007/s00603-008-0016-y
  8. Park, J.J., Shin, J.C., Hwang, J.H., Lee, K.H., Seo, H.J., Lee, I.M. (2012), "Assessment of over / under-break of tunnel utilizing BIM and 3D laser scanner", Journal of the Korean Tunnelling and Underground Space Association, Vol. 14, No. 4, pp. 437-451. https://doi.org/10.9711/KTAJ.2012.14.4.437
  9. Richart, F.E., Hall, J.R., Woods, R.D. (1970), Vibration of Soils and Foundations, Prentice-Hall, New Jersey, pp. 247-262.
  10. Sagong, M., Moon, C.Y., Lee, J.S., Hwang S.K., Kim B.H. (2006), "Development of a 3D laser scanner based tunnel scanner", Journal of the Korean Tunnelling and Underground Space Association, Vol. 8, No. 4, pp. 377-388.
  11. Thiel, K.H., Wehr, A. (2004), "Performance capabilities of laser-scanners-an overview and measurement principle analysis", International Archives of Photogrammetry, Remote Sensing and Spatial Information Sciences, 36(Part 8), W2.