三维激光扫描技术在类矩形隧道断面测量中的应用OA

Line and slope adjustment-based section measurement is an important measurement work in the construction of urban rail transit projects.The horizontal distance and top and bottom elevations from the inner contour line of the tunnel within the range of the section and the station and the line centerline were measured to determine the completion error as the basis for determining whether to adjust the line.The innovation and application of special-shaped shield technology have brought economic benefits to the project,while increasing the difficulty of tunnel section measurement.Based on the design parameters of the quasi-rectangular shield of rail transit,combined with the principle of three-dimensional laser scanning technology,this paper discussed the establishment of the quasi-rectangular tunnel model,the calculation of the design value of the measuring point,the point cloud data orientation,filtering,and noise reduction processing methods.An engineering example proved that the method met the requirements of the section measurement of a quasi-rectangular tunnel.