Unmanned aerial vehicle (UAV) based concrete crack detection device and method

Abstract

The invention discloses a UAV based concrete crack detection device. The detection device comprises a UAV body, an adsorption mechanism through which the UAV body is adsorbed to the concrete surface in a crack to be detected and a crack detection mechanism, the crack detection mechanism comprises a rotation driving motor fixed over the UAV body and a camera and a measuring scale fixed in the side,towards the crack to be detected, of the UAV body, the output end of the rotation driving motor is connected with the measuring scale via a rotating shaft, and the rotating shaft is fit to the concrete surface in the crack to be detected. Via the UAV based concrete crack detection device, the crack detection mechanism with the rotatable measuring scale is arranged, the length and the width of thecrack can be read directly via the measuring scale, a lot of data treatment later is not needed, and the measuring method is simple; and a positioning mechanism is arranged to record 3D spatial position information of the crack, and the crack is tracked and observed for long time.

Description

technical field [0001] The invention relates to a concrete crack detection technology, in particular to a concrete crack detection device and detection method based on an unmanned aerial vehicle. Background technique [0002] Cracks are an important factor that endangers the safety of concrete structures. In order to grasp their development, it is necessary to regularly detect concrete cracks. However, some cracks located in special parts such as the bottom of beams and high pier columns are affected by factors such as space and position, and it is often difficult to conduct direct manual observation. [0003] At present, for the concrete cracks where the observation is limited, a lifting platform or a detection vehicle with a cantilever are generally used for observation, which is inefficient and expensive. [0004] With the development of drone technology, it has become a trend to use drones to detect concrete defects. At present, drones generally detect cracks by taking ...

AI Technical Summary

Problems solved by technology

However, some cracks located in special parts such as the bottom of beams and high pier columns are affected by factors such as space and position, and it is often difficult to conduct direct manual observation.

[0003] At present, for the concrete cracks with limited observation, it is generally observed by a lifting platform or a detection vehicle with a cantilever, which is inefficient and expensive

[0004] With the development of drone technology, it has become a trend to use drones to detect concrete defects. At present, drones generally detect cracks by taking photos of cracks, and then analyzing the width and length of cracks based on image analysis technology. This method is greatly affected by factors such as shooting angle and pixel resolution, which leads to large errors and is not intuitive enough.

For example, the patent number "201720825746.5" provides "UAV with crossbow for detecting the width of cracks on the surface of concrete structures", the main principle is to use the drone to shoot an arrow with a scale on the front end to the crack, and shoot the arrow For photos with cracks, apply PS technology in the later stage, PS the scale in the photo to the crack, and then read the width of the crack. This method needs to launch arrows with scales in the early stage, and PS technology is needed in the later stage, which is complicated to operate and low in detection efficiency.

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