Title Rebar Spacing Fixing Technology using Laser Scanning and HoloLens
Authors Lee, Yeongjoo ; Kim, Jeongseop ; Lee, Jin Gang ; Kim, Minkoo
DOI https://dx.doi.org/10.6106/KJCEM.2024.25.2.069
Page pp.69-80
ISSN 2005-6095
Keywords Laser Scanning; Rebar AR; Rebar Spacing Inspection and Fixing; HoloLens
Abstract Currently rebar spacing inspection is carried out by human inspectors who heavily rely on their individual experience, lacking a guarantee of objectivity and accuracy in the inspection process. In addition, if incorrectly placed rebars are identified, the inspector need to correct them. Recently, laser scanning and AR technologies have been widely used because of their merits of measurement accuracy and visualization. This study proposes a technology for rebar spacing inspection and fixing by combining laser scanning and AR technology. First, scan data acquisition of rebar layers is performed and the raw scan data is processed. Second, AR-based visualization and fixing are performed by comparing the design model with the model generated from the scan data. To verify the developed technique, performance comparison test is conducted by comparing with existing drawing-based method in terms of inspection time, error detection rate, cognitive load, and situational awareness ability. It is found from the result of the experiment that the AR-based rebar inspection and fixing technology is faster than the drawingbased method, but there was no significant difference between the two groups in error identification rate, cognitive load, and situational awareness ability. Based on the experimental results, the proposed AR-based rebar spacing inspection and fixing technology is expected to be highly useful throughout the construction industry.