BIM-Based Mixed-Reality Application for Geometric Inspection of Prefabricated Bridge Decks

초록

Ensuring geometric accuracy in prefabricated bridge decks is essential for successful onsite assembly and maintaining structural performance. Conventional dimensional and geometric inspections rely heavily on manual measurements, which are time-consuming, labor-intensive, and prone to human error. This study proposes a BIM-based Mixed-Reality (MR) application that enables rapid, intuitive, and accurate geometric inspection of prefabricated bridge decks. The system integrates design BIM models with the physical environment through marker-based registration on the Microsoft HoloLens 2 (HL2), allowing inspectors to visualize dimensional attributes and shapes, assess positional deviations, and verify tolerance compliance directly within the MR workspace. To evaluate system accuracy, drift and translational error experiments were conducted, demonstrating stable hologram performance and marker-detection accuracy. The proposed method was validated on both small-scale and full-scale prefabricated decks, showing reliable detection of dimensional deviations and shear-pocket misalignments. The results confirm that the BIM-MR approach significantly improves inspection efficiency, accuracy, and decision-making, offering a practical and effective alternative for fabrication quality control and preassembly analysis in prefabricated bridge construction.

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