Rapid detection method for tunnel lining crack

Abstract

The invention, which belongs to the technical field of recording and repairing the inner surface of the tunnel lining, particularly relates to a rapid detection method for a tunnel lining crack. According to the method, the inner surface of a tunnel is shot along the axis of the tunnel quickly; according to a shooting result, a tunnel lining inner surface image is obtained; on the basis of combination of the shooting position, shooting azimuth information, and a clearance fracture surface mode in the tunnel, a shooting coordinate model is established and the shot image is analyzed; a mathematical mapping relationship between pixel points on the shot image and corresponding spatial points in an actual tunnel model is established; and on the basis of the mapping relationship, the shooting result is restored and expanded. The equipment is simple and is easy to operate; the damage reality of the inner surface of the tunnel lining is reflected by the adjusted photo; and thus the related staff is able to carry out tunnel maintenance timely and conveniently.

Description

technical field [0001] The invention belongs to the technical field of tunnel lining inner surface record repairing, and in particular relates to a method for quickly detecting tunnel lining cracks by restoring and unfolding photographed pictures of the inner surface of the tunnel lining into real objects. Background technique [0002] In recent years, with the large-scale and high-standard construction of my country's railways, a large number of railway tunnels have emerged nationwide. The occurrence and development of tunnel lining rupture will cause deformation and damage to the tunnel lining, thereby affecting the normal operation of the railway and even endangering the railway. Safety. Early detection of tunnel lining cracks and early treatment can reduce the risk of railway safety operation and prevent problems before they happen. Normally operating tunnels relying on manpower and simple equipment to inspect lining cracks is not only time-consuming and laborious, but a...

AI Technical Summary

Problems solved by technology

[0003] At present, there are more and more researches on the detection of tunnel lining cracks using digital image technology. Using image processing technology to detect tunnel lining cracks, from collecting images, digital processing, analysis and generating lining expansion diagrams, to obtaining the mileage position and range of tunnel lining cracks , scale, degree of damage and other factors, the detection method is safe and reliable, and the detection efficiency is high, which can provide a basis for the next step of tunnel renovation. However, the photos collected by the camera have the distortion effect of lens distortion, and because the shooting is a curved surface, there is distortion. Therefore, how to effectively collect images, and perform image processing and analysis to generate lining expansion diagrams has become a technical problem to be solved in the detection of tunnel lining cracks.

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