A method for detecting cracks in tunnel lining based on mobile 3D laser scanning technology

Abstract

The invention discloses a tunnel lining crack detection method based on mobile three-dimensional laser scanning technology, which includes: determining the length of the measurement route and the change trend of the route, and arranging several control points on the tunnel wall surface of the measurement route; When the vehicle is moving, the tunnel section is statically checked and collected by the 3D laser scanner to obtain the point cloud data of the tunnel section; the point cloud data of the tunnel section is preprocessed; when the scanning vehicle is moving, the control points are obtained by measuring with the total station Coordinates, and control in the same coordinate system; project the preprocessed tunnel section point cloud data onto a tunnel standard section to form an orthographic gray plan; measure the tunnel according to the ortho gray plan and the coordinates of each control point Lining surface crack data, and output after labeling and statistics. The invention can acquire a large amount of point clouds on the surface of the tunnel lining, and process and analyze the crack information on the surface of the tunnel lining to obtain faster and more accurate detection of the cracks on the tunnel lining.

Description

technical field [0001] The invention relates to a tunnel lining crack detection method based on mobile three-dimensional laser scanning technology, which belongs to the technical field of tunnel surveying and mapping. Background technique [0002] With the rapid development of the country's economy and the continuous advancement of urbanization, the number of railway tunnels continues to increase, which greatly improves the convenience of people's travel. However, due to the continuous changes in the external environment and geological conditions, as well as the design, construction, management and surrounding buildings Influenced by construction and other aspects, during the use of the tunnel, cracks, leakage, and block failures often occur, which seriously threaten the normal and safe use of the tunnel. An efficient and accurate detection technology is urgently needed to detect the state of the tunnel lining . In the phenomena of cracks, leakage, and block loss, cracks ar...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a tunnel lining crack detection method based on mobile three-dimensional laser scanning technology for the problems of complex operation, low efficiency, harsh environmental requirements, and high cost of the existing domestic tunnel lining crack detection technology, which can be used in Uninterrupted, fast and accurate acquisition of the target point cloud during the movement, and can use this as a medium to detect tunnel lining crack information

On the one hand, it solves the complex and low-efficiency problems of static station 3D laser scanning technology and the problem of sparse point clouds between two adjacent stations; on the other hand, it solves the harsh requirements of photogrammetry and other technical means for light

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