Method and device for dynamic non-destructive measurement of CRTSII type plate-type ballastless track seam

Abstract

The invention discloses a method and a device for dynamic non-destructive measurement of CRTSII type plate-type ballastless track seam. The method comprises the following steps: firstly enabling an ultrasonic pulse transmitting receiver to generate a sine wave exciting signal modulated by a Hanning window, amplifying the exciting signal by a preamplifier to drive an air-coupled ultrasonic transmitting transducer to convert the electrical signal into an ultrasonic wave to hit a CRTSII type plate-type ballastless track plate, then adopting an air-coupled ultrasonic receiving transducer to collect a guided wave echo signal, amplifying the guided wave echo signal by a post-amplifier, subjecting to A/D conversion, transmitting to the ultrasonic pulse transmitting receiver, then transmitting thereceived guided wave echo digital signal to a computer by the ultrasonic pulse transmitting receiver, performing signal processing and analysis by the computer adopting MATLAB software, and judging whether a seam defect exists by comparing an obtained first wave amplitude with a preset threshold value. By adopting the method and the device provided by the invention, the high-efficiency, non-destructive and real-time measurement of the seam defect of a CRTSII type plate-type ballastless track can be realized.

Description

technical field [0001] The invention relates to a method and a device for dynamic non-destructive detection of CRTS II plate type ballastless track separation, and belongs to the technical field of non-destructive detection of rails. Background technique [0002] Since the construction of my country's first high-speed railway, the Qinshen Passenger Dedicated Line, in 1999, high-speed railways have developed rapidly in my country. By the end of 2017, the operating mileage of my country's high-speed railways had exceeded 20,000 kilometers. CRTS Ⅱ slab ballastless track is mainly composed of track slab, CA mortar layer and support layer (base plate). It is an improved Borg slab ballastless track structure, which has the advantages of simple manufacture, installation and laying. , is one of the achievements of my country's high-speed railway introduction, digestion, absorption, and re-innovation. Therefore, with the rapid development of my country's high-speed railway, this kind ...

AI Technical Summary

Problems solved by technology

[0003] However, due to the different properties of the CA mortar layer and the other two layers of materials, under the long-term complex train load and environmental temperature field, the materials of each layer will deform to varying degrees, resulting in various damages such as debonding and separation joints. As a result, it will seriously affect the stability and smoothness of train operation, and stability and smoothness are precisely the important prerequisites for ensuring the fast and safe operation of high-speed rail, and will directly affect the normal operation of trains and the personal safety of passengers.

At present, the detection of the separation of CRTS Ⅱ slab ballastless track mainly relies on manual patrol and contact detection technology, because the effective skylight time for rail transit for line maintenance is only 2-3 hours, and high-speed railway The thread of the track 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 cost of detection and maintenance is very high, so that it cannot meet the needs of track safety early warning. Therefore, a high-efficiency and dynamic non-destructive testing CRTS II The method and device for the separation of slab type ballastless track will be of great significance and value

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