Method and device for multi-channel dynamic non-destructive measurement of ballastless track defect

Abstract

The invention discloses a method and a device for multi-channel dynamic non-destructive measurement of a ballastless track defect. The method comprises the following steps: firstly enabling an ultrasonic pulse transmitting receiver to generate an ultrasonic signal with a frequency in the range of 20-100 kHz, transmitting the ultrasonic signal to the interior of a ballastless track by an air-coupled ultrasonic transducer, using the remaining plurality of air-coupled ultrasonic transducers to collect a reflected echo signal and transmit the reflected echo signal to the ultrasonic pulse transmitting receiver, then transmits the received reflected echo signal to a signal amplifier for amplification by the ultrasonic pulse transmitting receiver, then transmitting to a computer, performing filtering and denoising on the reflected echo signal by the computer adopting MATLAB software, and then judging whether the defect exists according to an amplitude value of the obtained reflected echo andthe arrival time of the reflected echo. By adopting the method and the device provided by the invention, defects of the ballastless track can be measured in an efficient, non-destructive and real-timemanner, and timely warning and strong guarantee can be provided for the safe operation of a high-speed railway.

Description

technical field [0001] The invention relates to a multi-channel dynamic non-destructive detection method and device for ballastless track defects, belonging to the technical field of track non-destructive testing. Background technique [0002] Based on the advantages of high-speed railways such as fast speed, strong transport capacity, safety and punctuality, high-speed railways have become one of the public transportation methods vigorously developed in my country. High-speed railways, especially high-speed passenger railways, will definitely be the future development trend. With the rapid development of high-speed railways, ballastless track, as a main track structure, is composed of ballastless track slab, CA mortar layer, support layer and foundation bed, and its application scope is becoming wider and wider. However, in recent years, more and more diseases have appeared in the offline structure of the high-speed rail, including the off-line structural clearance, through...

AI Technical Summary

Problems solved by technology

The main reason is that the ballastless track will be squeezed and impacted during the high-speed and heavy-load operation of the train, which may cause looseness, cracks or cavities inside, and various damage layers or honeycomb layers on the outside. On the other hand, there may be defects in the ballastless track itself due to problems in the construction process and construction experience in the pre-production; in addition, natural disasters such as rain and snow erosion and environmental temperature changes will also lead to defect

The existence of defects will seriously affect the bearing capacity and durability of the ballastless track, which will cause the structure of the ballastless track to fail, and the stability and smoothness of the ballastless track and the offline structure of the high-speed railway cannot be guaranteed. It is precisely an important prerequisite to ensure the fast and safe operation of high-speed rail, and will directly affect the normal operation of the train and the personal safety of passengers

[0003] However, at present, the detection of ballastless track defects in my country mainly relies on manual static detection technology. Since the effective skylight time for rail transit to be used for line maintenance is only 2-3 hours, and the high-speed railway line is very long, if the existing Some detection methods not only consume a lot of manpower and material resources, but also have very low efficiency and high detection and maintenance costs, so that they cannot meet the needs of track safety early warning. Therefore, it will be important to develop a method and device that can efficiently and dynamically detect defects in ballastless tracks. meaning and value

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