Abstract: The National Speed Skating Oval is the world’s first super-large ice surface cooled by carbon dioxide, covering an area of about 12 000 square meters. The high-precision installation of the ice pipe is very important. The traditional measurement method evaluates the overall situation of drainage through 30% spot check and discrete sampling check. Three-dimensional laser point cloud data can extract the spatial location information of each tube, and detect the installation of refrigeration tube more comprehensively. In this paper, a three-dimensional laser operation method based on multi-target ball prism is proposed, and two new algorithms are proposed, the warpage detection method and the parallelism detection method of the tube. This method provides an important basis for the construction, operation and maintenance of the National Speed Skating Oval. This method can be used as a reference for specific building construction detection.

Key words: confined spaces, making ice tube, 3D laser scanning of multi-target spheres, line measurement, super-large speed skating area