This study considers the proper repair techniques by examining the most representative repair cases of the Korean arch bridges and proposes the constructional manual which can apply similar occasions. The cases are Seonamsa Seungseongyo and Songgwangsa Geukrockgyo where this researcher had taken part in the repair works. This Study proposes the maintenance construction manual about the performance degradation drew by performance degradation of the both Korean arch bridges in the maintenance process. First, arch bridge maintenance should be carried out in the dry season, when water is impermeable in the bottom surface of the bridge. Moreover, risk factors of the maintenance should be excluded to secure the water vally flow, the bypass and the temporary bridge. Second, prior to repair, it has to precede ①3D shooting ② formal examination ③structure safety test ④geological and lithic surveys ⑤arch curvature establishment and makeshift frame settlement before transformation ⑥relationship expert comments. Third, if the baduk and the foundation stones are inevitable to replace due to performance degradation on the foundation, it should use the high quality stones and secure greater stress by extending the standard range. The foundation on irregular rock needs to be flattened and underside on the replaced materials require Grengyijil to deliver the equal loads. Fourth, In the process of dismantling the stones of the arched bridge, it could make heavy weathering degree and not reuse the materials. Charge should converge the expert advices to choose the reuseable, the conservate and the alternative materials, and increase the reutilization of the raw materials by preservation and reinforcement treatments. Fifth, the side wall should be repaired by the rubble work technique which is not able to pile compost satiety, so it must use long depth of masonary stones for reinforcement. It is considered to reinforce the stone wall in shore as much as possible and protect the abutment and the side wall on the upstream for the arch bridge maintenance works.

Abstract
1. 서 론
    1-1. 연구의 배경 및 목적
    1-2. 연구의 대상
2. 대상현황
    2-1. 선암사 승선교
    2-2. 송광사 극락교
3. 한국의 홍예교에 대한 고찰
    3-1. 홍예교의 현황
    3-2. 홍예교의 구조
4. 성능저하원인 분석
    4-1. 홍예교의 성능
    4-2. 외부적 요인
    4-3. 내부적 요인
    4-4. 소결
5. 보수방안 고찰
    5-1. 홍예교 보수의 지향
    5-2. 보수 방법
    5-3. 원인별 보수 방안
6. 결론
References

• 김정언(전남대학교 건축공학과 박사수료) | Kim Jeong-Eon Corresponding Author
• 천득염(전남대학교 건축학부 교수) | Cheon Deuk-Youm