As the 3D laser scanning technology capable of databaseing large sewage box culverts becomes possible, it is necessary to develop a standardization manual that can clearly distinguish the structural and operational defect types of box culver and analyze the defect data. In this study, we collected and analyzed defects in sewage box culverts of 14,827m in total by selecting three districts in Korea. The major defects were surface damages, and their defect densities were 2.17 m2/m, 0.27 m2/m and 0.10 m2/m for aggregate exposure, Steel reinforcement exposure, and Steel reinforcement projecting. In order to support the decision of the box culverment management, it was divided into five grades and each defect code and defect score were allocated. The results of this study are useful for the diagnosis of the sewage box culverts in Korea and it is expected to support a decision making for management.

1. 서 론
 2. 연구수행방법
  2.1 3차원 Laser Scanning 데이터 취득 및 저장 기술
  2.2 대형 박스암거의 조사지역 선정 및 자료 수집
 3. 연구수행결과
  3.1 대형 하수박스의 결함 특성 구분
  3.2 하수박스의 결함 빈도 분석결과
  3.3 유지관리 의사결정을 위한 심각도 평가
 4. 결 론
 사 사
 References

• 한상종(한국건설기술연구원 환경․플랜트연구소, Korea Institute of Civil Engineering and Building Technology, Environmental and Plant Engineering Research Institute) | Sangjong Han Corresponding author
• 송호면(한국건설기술연구원 환경․플랜트연구소, Korea Institute of Civil Engineering and Building Technology, Environmental and Plant Engineering Research Institute) | Homyeon Song