Ballastless track concrete structure damage detection method based on stress waves

Abstract

The invention relates to a ballastless track concrete structure damage detection method based on stress waves. The method for identifying the interlayer damage position and the damage depth by adopting a peak value of a stress wave reflection spectrum curve of a track plate specifically comprises the following steps of arranging an acceleration sensor on the track plate to receive a stress wave time domain signal, and obtaining the spectrum curve of the track plate through the time domain signal reflected by the stress wave; and calculating the propagation depth of the stress wave by utilizingthe peak value of the spectrum curve to determine whether the injury exists and the specific depth. According to the method, the stress wave reflection theory is combined with the track plate frequency spectrum curve peak value to recognize whether the track plate is damaged or not and recognize the damage depth, the method is a nondestructive detection method, test operation is easy and convenient, the detection result is visual and clear, whether the damage exists or not can be recognized, and the damage depth can be accurately located.

Description

technical field [0001] The invention relates to the technical field of railway tracks, in particular to a damage detection method for ballastless track concrete structures based on stress waves. Background technique [0002] At present, my country's ballastless track operation mileage is about 35,000 kilometers, ranking first in the world. Ballastless track structures mainly include CRTS I-type double block, CRTS I-type slab, CRTS III-type slab ballastless track, etc. With the increase of operation time, the structure has been damaged to varying degrees. [0003] The concrete structure system of ballastless track is a large concrete structure, and it is also a typical layered structure. Different ballastless track structures are divided into unit slabs and longitudinal connecting slabs. Between the track plate (track bed plate) and the base plate, it is difficult to directly observe with the naked eye. At present, methods for detecting concrete damage include rebound test...

AI Technical Summary

Problems solved by technology

Rebound test generally tests the surface strength of structures, but cannot measure the strength of deeper structures; the detection environment of infrared thermal imaging has a great influence on the detection results, making it difficult to detect small damages such as cracks and cavities

Ground penetrating radar uses the principle of electromagnetic waves, but the ballastless track bed slab or track slab is densely covered with steel bars, and the reflection of the electromagnetic waves by the steel bars will inevitably affect the accuracy of damage detection. The above method is not suitable for damage detection of ballastless track structures

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