道路橋床版の点検診断と長寿命化技術 (2)

[CS8-15] Development of HTS-SQUID inspection system for orthotropic steel decks of expressway bridges

*塚本 晃¹、波頭 経裕¹、安達 成司¹、押久保 靖夫¹、田辺 圭一¹、塚田 啓二² (1. 超電導センシング技術研究組合、2. 岡山大学)

Keywords:SQUID, non-destructive evaluation, Eddy current testing, orthotropic steel deck, fatigue crack

In this study, We have developed a HTS-SQUID eddy current testing (ECT) system for detection of a fatigue crack in a steel deck plate. A field test using the SQUID ECT system was performed on an expressway bridge having an orthotropic steel deck structure. Although a signal corresponding to existence of a fatigue crack was not detected due to a low occurrence rate of fatigue crack, we could demonstrate a stable and long-time operation in an urban area during the daytime and acquisition of correct data corresponding to some structural features of the expressway bridge.