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[CS1-18] Investigation of occlusion position identification of tunnel central drainage work

*Masaki Komai¹, Hiroshi Suenaga¹, Tomoki Harakawa¹, Itirou Imada², Shougo Masunaga² (1. West Nippon Expressway Engineering Chugoku Company Limited , 2. West Nippon Expressway Company Limited)

Keywords:Tunnel Transformation Survey, Road surface stagnation, Central drainage work blockage, Infrared camera survey, Groundwater level confirmation survey, Fiberscope observation survey