Method and a device for dynamically detecting defects of ballastless track

Abstract

The invention discloses a method and a device for dynamically detecting defects of ballastless track. At first, an acoustic wave excitation unit is used to input vibration energy to a track plate, anacoustic wave in that frequency range of 10 to 20 kHz is generated, and the acoustic wave signal is collected by a microphone sensor and transmit to a computer. The computer calculates the collected acoustic wave velocities and compares the velocities with the threshold values to judge whether there are defects, specifically, if the collected acoustic wave velocities are smaller than the thresholdvalues, the defects are judged. The greater the difference from the threshold is, the greater the defect is. The invention realizes the dynamic detection of ballastless track defects. The invention has the advantages of fast detection speed, high efficiency, long-distance detection operation in several hours of skylight time, basically no influence of external environment on the detection result,high detection precision, and the defect position can be marked at the same time so as to facilitate later maintenance and repair, so that the detection and maintenance work efficiency is greatly improved.

Description

technical field [0001] The invention relates to a method and a device for dynamically detecting defects of a ballastless track, belonging to the technical field of track defect detection. Background technique [0002] The ballastless track cancels the sleeper and ballast bed of the traditional ballasted track, and is composed of a ballastless track slab, a CA mortar layer, a support layer and a foundation bed, and is a brand-new fully supported slab track structure. With the rapid development of high-speed railway, the application of ballastless track has become more and more extensive. Since the ballastless track structure has been exposed to the complex atmospheric environment and is affected by many factors (train load, environmental conditions, etc.) Empty and other damage. 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 var...

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] At present, far-infrared imaging or electromagnetic wave detection technology is widely used in the defect detection technology of ballastless track. However, the far-infrared imaging technology is greatly affected by the external temperature and is not suitable for working on high-speed railways in the wild. Electromagnetic wave technology is easily affected. The influence of steel bars in the track slab, the intricate steel bars in the track slab make the detection results of electromagnetic wave technology deviate

In addition, the current detection technologies are all static detection technologies, which can only be carried out within the skylight time for maintenance, while the effective skylight time for rail transit to be used for line maintenance is only 2-3 hours, and the threads of high-speed railways are It is very long. If the existing detection method is used, it will not only consume a lot of manpower and material resources, but also the efficiency is very low, and the detection and maintenance cost is very high, so that it cannot meet the needs of track safety early warning. The method and device will be of great significance and value

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