Segment roundness measurement method and system based on two-dimensional laser radar

By using a two-dimensional lidar-based tube roundness measurement method in tunnel engineering, the problems of untimely measurement and large space occupancy in the existing technology are solved, and high-precision and timely tunnel roundness measurement are achieved, and construction efficiency and quality are improved.

CN119689432APending Publication Date: 2025-03-25HUAZHONG UNIV OF SCI & TECH
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Patent Information

Application Number
CN202411969873.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-30
Publication Date
2025-03-25

AI Technical Summary

Technical Problem

In the prior art, the two-dimensional mobile scanning method uses lidar to supplement a mobile measurement car to conduct continuous measurement of the tunnel, but requires the laying of tracks, which consumes a large space and the scanning results are not timely.

Method used

The tube sheet true circularity measurement method based on two-dimensional lidar is used to obtain the point cloud data of the tunnel pipe wall under the polar coordinate system through lidar, random noise filtering and coordinate conversion are performed to eliminate invalid data caused by debris, and the long and short axis of the tunnel cross-section is calculated using ellipse fitting technology to calculate the tunnel true circularity.

Benefits of technology

Timely scanning of each ring pipe piece is achieved, the efficiency of tunnel engineering is improved, the accuracy and reliability of measurement results are significantly improved, and labor costs are reduced.

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Abstract

The invention belongs to but not limited to the technical field of tunnel engineering, and particularly relates to a segment roundness measurement method and system based on a two-dimensional laser radar, and the method comprises the steps: S1, obtaining the point cloud data of a tunnel pipe wall under a polar coordinate system through the laser radar; s2, performing random noise filtering on the point cloud data and converting the point cloud data into a Cartesian coordinate system; s3, useless point cloud data generated by sundries such as pipelines and tracks on the pipe wall are filtered out; and S4, projecting the point cloud data to a two-dimensional plane, carrying out ellipse fitting on the filtered point cloud data to fit an ellipse contour of the section of the tunnel, and calculating a long axis and a short axis of the ellipse contour according to an ellipse curve equation so as to calculate the roundness of the tunnel. According to the invention, the laser radar is installed on the segment assembling machine for scanning, the installation of a redundant scanning device is avoided, the influence of a dust environment and sundries on scanning data is avoided to the greatest extent through the annular rotation of the segment assembling machine, and the operability and robustness of the scanning method are greatly improved.
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