철도 인프라 철근 품질점검 효율성 향상을 위한 BIM 기반 AR 기술 개발

Together with concrete, rebar in railway bridges is a key element that determines the structural safety and service life of bridges. Thus, it is imperative to conduct continuous and repeated quality inspections during construction. However, quality inspections of rebar at construction sites still mainly rely on visual inspections and traditional measuring tools, leading to a high possibility of errors and omissions in inspections, as well as requiring significant time and labor. While previous studies have proposed the use of BIM-based Augmented Reality (AR) for inspections, they have failed to present technical solutions for projecting a large niunber of rebar elements or AR applications that meet practical demands. This study aimed to develop an AR system specialized for quality inspection of railway bridge rebar, focusing on simplification techniques for projecting large numbers of elements and developing specific AR fiiiictioiis customized for inspection. SpeCcifically, this study established a Mesh combine technique to reduce the number of elements in major parts of the bridge and developed AR functions to review the proper placement, connection status, and spacing compliance requirements. For practical verification, these technologies and functions were applied to an actual railway bridge under construction, and the improvement in efficiency compared to traditional inspection methods was evaluated quantitatively.