The Bridge Safety Department of Seoul Metropolitan Government has regularly conducted precise inspection and precision safety inspection to maintain the bridge's function and safety. During a precise safety inspection in 2015, oil leakage progression was found on the cable anchorage system within the stiffened girder of Nilsen Arch bridge and as a follow-up measure, the cable replacement for the cable ACD11 was carried out in order to identify the relevant cause of the oil leakage and evaluate the integrity of the existing cable. The mechanical properties and fatigue performance tests of the cable strands of bridge inservice for about 20 years and comprehensive analysis of oil leakage were carried out. They were described hereby.

Abstract
 1. 서 론
 2. 케이블 정착단 누유경로 및 현황
 3. 케이블 시스템
 4. ACD11 케이블 교체 공사
 5. 강연선 건전성 평가 및 누유물 성분분석 결과
 7. 결 론
 참고문헌

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• 한유석(서울특별시 안전총괄본부 교량안전과) | Han, Yu Seok
• 백운경(서울특별시 안전총괄본부 교량안전과 교량관리팀) | Baek, Woon Gyoung
• 김재석((주)후레씨네코리아 기술팀) | Kim, Jae Seok 교신저자