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2022 Vol.24, Issue 2 Preview Page

Research Paper

Concrete plug cutting using abrasive waterjet in the disposal research tunnel

연마재 워터젯을 활용한 처분터널 내 콘크리트 플러그 절삭

Yohan Cha1
,
Geon Young Kim2
,
Eun-Soo Hong3
,
Hyung-Woo Jun4
,
Hang-Lo Lee5*
차 요한1
,
김 건영2
,
홍 은수3
,
전 형우4
,
이 항로5*
1Senior Researcher, Disposal Performance Demonstration Research Division, Korea Atomic Energy Research Institute
2Principal Researcher, Disposal Performance Demonstration Research Division, Korea Atomic Energy Research institute
3President, HBC Inc.
4President, Jeyoung Engineering & Construction
5Post-Doctoral Researcher, Disposal Performance Demonstration Research Division, Korea Atomic Energy Research Institute
1한국원자력연구원 처분성능실증연구부 선임연구원
2한국원자력연구원 처분성능실증연구부 책임연구원
3(주)에이치비씨 대표이사
4(주)제영E&C 대표이사
5한국원자력연구원 처분성능실증연구부 박사후연구원
*Corresponding Author
31 March 2022. pp. 153-170
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Abstract

Waterjet has been comprehensively used in urban areas owing to a suitable technique for cutting concrete and rock, and low noise and vibration. Recently, the abrasive waterjet technique has been adopted and applied by the Korea Atomic Energy Research Institute to demolish concrete plugging without disturbing and damaging In-situ Demonstration of Engineered Barrier System in the disposal research tunnel. In this study, the use of abrasive waterjet in the tunnel was evaluated for practical applicability and the existing cutting model was compared with the experimental results. As a variable for waterjet cutting, multi-cutting, water flow rate, abrasive flow rate, and standoff distance were selected for the diversity of analysis. As regarding the practical application, the waterjet facilitated path selection for cutting the concrete plugging and prevented additional disturbances in the periphery. The pump’s noise at idling was 64.9 dB which is satisfied with the noise regulatory standard, but it exceeded the standard at ejection to air and target concrete because the experiment was performed in the tunnel space. The experimental result showed that the error between the predicted and measured cutting volume was 12~13% for the first cut and 16% for second cut. The standoff distance had a significant influence on the cutting depth and width, and the error tended to decrease with decrement of standoff distance.

Keywords
Disposal tunnel
Plug
Abrasive watejet
Concrete cutting

워터젯은 콘크리트와 암석 절삭에 적합하며 소음과 진동이 적어 도심지 시공에 널리 활용되는 기술이다. 최근 한국원자력연구원은 처분터널 내 공학적방벽의 열-수리-역학적 복합거동 현장시험의 콘크리트 플러그를 교란 및 손상 없이 해체하기 위해 연마재 워터젯 기술을 채택 및 적용하였다. 본 연구에서는 플러그 해체를 통한 연마재 워터젯의 터널 내 적용성을 평가하였고, 절삭 결과를 개발된 절삭 모델 결과와 비교하였다. 현장 적용성에 관해서는, 워터젯 활용은 경로선택이 용이하였으며 주변부의 추가적인 교란을 발생시키지 않았다. 펌프의 소음은 공회전 시 64.9 dB로 국내 생활소음 ‧ 진동의 규제기준을 만족하였으나 공중 분사 및 절삭 시에는 터널 내에서 측정되어 그 기준을 상회한 것으로 나타났다. 절삭 모델 검증을 위해 연마재 워터젯의 반복 절삭, 유량, 연마재 투입량 및 이격거리를 주요 변수로 선정하였고 절삭 모델로 계산된 절삭 부피와 측정된 부피의 오차는 1회 절삭 시 12~13%, 2회 절삭 시 16%를 보였다. 절삭 깊이와 폭은 이격거리에 큰 영향을 받았으며, 이격거리가 작을수록 오차가 감소하는 경향을 보였다.

키워드
처분터널
플러그
연마재 워터젯
콘크리트 절삭
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Information
  • Publisher :Korean Tunneling and Underground Space Association
  • Publisher(Ko) :한국터널지하공간학회
  • Journal Title :Journal of Korean Tunnelling and Underground Space Association
  • Journal Title(Ko) :한국터널지하공간학회 논문집
  • Volume : 24
  • No :2
  • Pages :153-170
  • Received Date : 2022-01-20
  • Revised Date : 2022-02-17
  • Accepted Date : 2022-02-18
  • DOI :https://doi.org/10.9711/KTAJ.2022.24.2.153
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