Application of 3D Laser Scanning and BIM Technology in Digital Construction of Metro Shield Tunnel

To meet the demand for digital construction of subway shield tunnels, three-dimensional laser scanning technology is used to obtain high-precision point cloud data of interval tunnels, extract corresponding ellipticity and cross-sectional clearance data information, analyze data accuracy, generate data reports, and use BIM technology to establish a complete and usable visual model, thereby achieving lightweight sharing and quality monitoring of tunnel construction models. The results show that 3D laser scanning technology can solve the pain points of traditional measurement modes, which are time-consuming, labor-intensive, and slow results submission; BIM technology can also visually model and design comparisons of point cloud data on this basis, improving modeling efficiency by 50% with an average error of less than 3cm. This technology can truly and effectively reflect the actual construction deviation and quality defects of the tunnel, ensuring the safety and stability of the tunnel.