Construction deformation of ultra-high piers based on 3D scanning technology

WU Guohua; MA Wenlong; ZHAN Yuhua; DONG Shujing; ZHAO Yulong

doi:10.3969/j.issn.1672-0032.2025.04.009

Abstract：To address the deformation issues of ultra-high pier columns in traditional hydraulic climbing formwork construction techniques,a hydraulic climbing formwork system positioning method is adopted.The support frame is positioned and assembled according to the construction plan,and the hydraulic climbing formwork is initially assembled.Three-dimensional scanning technology is used to re-measure and fine-tune the positioning of the pier columns,ensuring that the hydraulic climbing formwork system can be accurately installed.Using parameters such as the angle between point normal vectors and curvature differences as segmentation criteria,an optimized region growing algorithm is employed for plane segmentation of the point cloud of the pier columns.The obtained key three-dimensional point cloud data is converted to a two-dimensional plane,and the coordinate range is determined through linear fitting,which is then used to reverse calculate the coordinates of the control points of the pier columns in three-dimensional space.The software Revit is used to establish a three-dimensional model of the pier columns and perform plane segmentation,analyzing the deformation of four planes in the z direction.For each plane,66 feature point coordinates are extracted,and the least squares method is used for surface fitting and deformation calculation.The results indicate that the maximum relative difference between the actual deformation and the designed deformation in the x direction for the four planes is 0.0030 cm.The deformation of the pier columns during construction is minimal,meeting the construction control requirements.Through three-dimensional scanning technology,the deformation of pier columns during the construction process can be effectively predicted.