Recognition method of concrete crack width based on UAV airborne imaging

Abstract

The invention discloses a concrete crack width identification method based on unmanned aircraft airborne imaging. The steps are as follows: setting the angle between three laser beams; Ground receiving device; judge whether there are cracks in the measured object, if so, proceed to the next step; start the camera and three-point laser range finder at the same time, obtain crack photos and three distance parameters and send them back to the ground receiving device; The crack image is processed to obtain the number of crack width pixels; the object distance is obtained according to the obtained distance parameters and the angle between the three laser beams; the actual physical size of the measured object is obtained by the distance measurement method, and the crack width is obtained. The identification method has the advantages of convenient operation, simple calculation and high accuracy, completely solves the difficult problem in bridge crack detection, and improves the safety and reliability of the bridge. The invention also discloses a concrete crack width recognition system based on unmanned aircraft airborne imaging.

Description

technical field [0001] The invention relates to a method for identifying the width of cracks on the surface of concrete components, in particular to a system and method for identifying the width of concrete cracks based on unmanned aircraft airborne imaging. Background technique [0002] By the end of 2014, the total mileage of my country's highways reached 4.4639 million kilometers, and the number of road bridges reached 757,100, an increase of 21,400 over the previous year (the 2014 Statistical Yearbook of the Ministry of Transport does not include tens of thousands of railway bridges, municipal bridges, pipeline bridges, etc. ), the number of bridges built in my country ranks among the top in the world. As of February 2015, the number of motor vehicles in my country has reached 264 million. In the next 10 years, my country's motor vehicles will continue to increase significantly, and road traffic safety is facing severe challenges. As a key node of transportation, bridges...

AI Technical Summary

Problems solved by technology

Bridge inspection vehicles occupying the road for a long time will inevitably cause traffic jams and seriously affect traffic safety. For busy urban arterial roads, arterial lines such as expressways or national highways, it may lead to traffic paralysis (the working hours given by the general bridge management department are from 23:00 to 4:00 , which seriously affects the accurate test of the bridge appearance at night)

[0005] Second, it is not suitable for all types of bridges

At present, the horizontal outrigger length of various types of bridge inspection vehicles is basically within 2.5m, and a considerable number of urban bridges in my country require pedestrians whose sidewalk width exceeds 3m, so bridge inspection vehicles cannot be used as on-site test work platforms

Third, for bridges with main arch rings, suspenders, stay cables and other components on both sides of the bridge deck, the outrigger working space of the bridge inspection vehicle is limited, and it is impossible to use the bridge inspection vehicle as a working platform for testing

Fourth, bridge towers, stay cables, and arch rings that exceed a certain height cannot be tested by bridge inspection vehicles due to the height limit of the outrigger

[0006] Third, it is not suitable for post-earthquake bridge assessment

After the earthquake, traffic was blocked, and there were damaged bridges, which could not guarantee the traffic and safety of bridge inspection vehicles

The Wenchuan Earthquake on May 12, 2008 and the Qinghai Yushu Earthquake on April 14, 2010 severely damaged bridges and other infrastructure, hindered post-earthquake relief work, and seriously delayed rescue operations. Insufficient technical reserves for rapid test and evaluation of bridges after the earthquake and emergency maintenance and repair technology

[0007] Fourth, the use and maintenance costs are high

At present, the unit price of each domestic bridge inspection vehicle is more than 800,000 yuan, and special personnel are required to operate and maintain it regularly; imported bridge inspection vehicles cost more to use and maintain

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