Intelligent reinforcing steel bar sleeve grouting defect detecting method based on voiceprint features

Abstract

The invention discloses an intelligent reinforcing steel bar sleeve grouting defect detecting method based on voiceprint features. The method specifically includes: building the finite element models and actual models of reinforcing steel bar sleeve connecting structures of different grouting defect proportions, and simulating and testing the response features of optimal fixed-frequency sound waves at the structures to obtain the voiceprint features of grouting defects; using the voiceprint features of the grouting defects as the judgement standards of actual detection, and integrating the voiceprint features into a reinforcing steel bar sleeve grouting defect detecting system; during actual detection, using a rare-earth giant magnetostrictive transducer to trigger the optimal fixed-frequency sound waves, using a sound wave receiving sensor to collect the response signals of the reinforcing steel bar sleeve structures, using fractional-order Fourier transformation signal analysis and processing to obtain the actual-structure defect voiceprint features with surface interference being removed, and automatically comparing the actual-structure defect voiceprint features with a reinforcing steel bar sleeve defect voiceprint feature database so as to determine actual reinforcing steel bar sleeve grouting defects. The method has the advantages that influence of human factors is avoided, detection precision is increased, detection and analysis time is reduced, and detection efficiency is increased.

Description

technical field [0001] The invention relates to the technical field of non-destructive testing, in particular to an intelligent method for detecting grouting defects of steel bar sleeves based on voiceprint features. Background technique [0002] The prefabricated concrete structure building is an industrialized building constructed by prefabricating the main components in the factory, assembling them at the construction site, and then connecting the components together through a small amount of cast-in-place operations. Sleeve grouting connection of steel bar is an important connection method of stressed steel bars in this structure, and the connection joint is composed of three parts: ribbed steel bar, sleeve and grouting material. The connection principle is: the ribbed steel bar is inserted into the sleeve, and the non-shrinkage or micro-expansion cement-based grouting material is poured into the sleeve to fill the gap between the sleeve and the steel bar. The inner wal...

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Problems solved by technology

[0007] At present, the research on the grouting of the steel sleeve mainly includes the impact echo method and the traditional ultrasonic method. These two methods have the disadvantages of low precision, need manual experience judgment, and the detection method is artificial hand hammer excitation, which is difficult to meet the actual situation on site. application

In addition, there is also research on the use of industrial X-rays to detect steel sleeve grouting. Although this method has high accuracy, X-ray equipment is not suitable for on-site use and poses certain safety risks to inspectors

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