In light of the maintenance of underground structures, the evaluation scope of precise inspection for safety and diagnosis have been revised. Crack, leakage, deterioration, and drainage system are evaluated with field inspection in maintenance manner. It also proposed that the additional revision of the precise inspection for safety and diagnosis.

• 추진호(한국시설안전공단 도시철도팀 과장, 박사과정) | Choo, Jin Ho 교신저자
• 장영두(서울메트로 토목2과 차장) | Jang, Young Doo
• 안팔용(대구도시철도공사 토목팀 팀장) | Ahn, Pal Young
• 이대수(대구도시철도공사 토목팀 주임) | Lee, Dae Soo
• 신용석(한국시설안전공단, 도시철도실 실장, 공학박사, 시공기술사) | Shin, Young Seok