Bridge pier crack nondestructive quantitative detection method based on unmanned aerial vehicle remote sensing

Abstract

The invention discloses a bridge pier crack nondestructive quantitative detection method based on unmanned aerial vehicle remote sensing. The images of the bridge body and each bridge pier and the corresponding photographing center coordinate information are acquired; a three-dimensional true color bridge model is generated; a crack two-dimensional image object is acquired; a crack three-dimensional spatial object is acquired; and a crack plane projection object is acquired and the crack attribute information is calculated. The advantages of small size and flexibility of the unmanned aerial vehicle can be fully utilized to realize rapid and efficient detection of the crack of the high bridge pier, the high tower and other areas where people have difficulty to reach, the quantitative information can be nondestructively acquired, and the data support can be provided for scientific and refined bridge detection and maintenance in time.

Description

technical field [0001] The invention relates to the technical field of bridge detection, in particular to a method for non-destructive quantitative detection of cracks in bridge pier towers based on UAV remote sensing. Background technique [0002] As a key component of the transportation network, bridges are increasing in number and in scale with the continuous advancement of the country's urbanization process. With the increase of bridge service time, the number of bridges entering the dangerous period is increasing every year, which is one of the important hidden dangers of the safe operation of the transportation network. Cracks are the main form of bridge early-stage diseases. Rapid and efficient detection of bridge cracks and early detection of bridge diseases are important basis for scientific and timely formulation of bridge repair and maintenance plans. [0003] At present, there are mainly the following methods for bridge crack detection: [0004] (1) Use a large...

AI Technical Summary

Problems solved by technology

This method not only interferes with the normal operation of bridge traffic, but also makes it difficult to guarantee personnel safety, low work efficiency, and poor flexibility. The inspection quality is too dependent on the quality of inspectors and cannot be guaranteed, and it is not suitable for the inspection of high bridge piers and high piers.

[0005] (2) Climbing robots are used to detect bridge cracks. This method can effectively reduce the danger of operators and reduce the cost of detection. However, it is mainly used for bridge bottom detection and cannot perform quantitative analysis of cracks.

[0006] (3) Use the road surface crack detection vehicle, but this method mainly scans along the bridge deck and can only detect bridge deck cracks

At present, the method of erecting a high-definition camera on a tripod is expensive, and sometimes it is difficult to find a suitable location for high piers and towers to erect equipment and cannot be detected; bridge detection based on drones and high-definition cameras can only obtain image information of bridge cracks , mainly used for bridge inspection and qualitative analysis, and quantitative information of bridge cracks cannot be obtained

[0008] In general, the research on non-destructive quantitative detection methods for cracks in bridge piers and towers based on UAV remote sensing is basically blank.

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