Recently, there has been frequent shortage of expansion joint in expressway bridges. When that happens, maintenance budgets will be overloaded and not effective, so it is not easy to come up with a solution. In this study, we introduce a bridge inspection system that combines laser image sensing technology and automatic control technology, which have been recently applied in various fields. And this system was developed to measure bridge extension joints while traveling 100km/h.

Abstract
 1. 서 론
 2. 무차단 교량 신축이음부 유간 조사
 3. 신축이음부 모니터링 체계 구축 방안
 4. 결 론

• 김인배(한국도로공사, 도로교통연구원, 구조물연구실) | Kim, In Bae
• 이병주(한국도로공사, 도로교통연구원, 구조물연구실) | Lee, Byeong Ju
• 박창호(한국도로공사, 도로교통연구원, 구조물연구실) | Park, Chang Ho