3D scanning method for subway detection and measurement

Abstract

The invention relates to the technical field of subway detection and measurement methods and in particular to a 3D scanning method for subway detection and measurement. The method comprises the following steps: scanning to obtain tunnel two-dimensional point cloud data, and synchronously collecting mileage data; matching the two-dimensional point cloud data and the mileage data, to obtain tunnel three-dimensional point cloud data; slicing a tunnel, and pre-processing the slice; and executing ellipse fitting. Compared with the prior art, the method has the advantages of solving the problem in the prior art that monitoring points are distributed on the pipe wall of the tunnel, and a monitoring method by using a total station, a profiler and a convergence instrument wastes time and energy, and realizing the whole monitoring and deformation monitoring to the tunnel. Through the 3D scanning method, the subway tunnel and structure are detected and measured, the whole situation of the tunnelcan be comprehensively mastered, a digital file is preserved, the large-scale tunnel convergence measurement work and the tunnel axis measurement work can be realized, and the efficiency and accuracyof the tunnel monitoring measurement are effectively improved.

Description

[technical field] [0001] The invention relates to the technical field of subway detection and measurement methods, in particular to a 3D scanning method for subway detection and measurement. [Background technique] [0002] In today's information age based on computer technology, people's demand for spatial three-dimensional information is more urgent. The traditional engineering measurement methods based on distance measurement and angle measurement are quite mature in many aspects such as theory, equipment and application. The new total station can complete the high-precision measurement of characteristic targets, and GPS can accurately locate the world 24 hours a day, all-weather 3D coordinates of any location, but they are mostly used for high-precision measurement of sparse target points. The emergence and development of 3D laser scanning technology provides a new technical means for the acquisition of spatial three-dimensional information, and provides the necessary li...

AI Technical Summary

Problems solved by technology

[0003] Tunnel deformation monitoring is of great significance to the safety of tunnel construction and operation. The existing monitoring methods are mainly to arrange monitoring points on the tunnel wall and use total stations, profilers, convergence meters, etc. to monitor, but these methods not only Time-consuming and labor-intensive, more importantly, it is difficult to realize the overall monitoring of the tunnel

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