Structure defect rapid nondestructive test apparatus under high speed railway and method thereof

Abstract

The invention relates to a structure defect rapid nondestructive test apparatus under a high speed railway and a method thereof. A signal emission unit, a signal receiving unit, a giant magnetostrictive transducer and a hub-type vibration sensor are arranged on a track monitoring vehicle; an output terminal of a vibration control signal of a processor is connected with a signal input terminal of the giant magnetostrictive transducer through the signal emission unit, the signal output terminal of the hub-type vibration sensor is connected with the signal input terminal of the signal receiving unit, the signal output terminal of the signal receiving unit is connected with the signal input terminal of an analog-to-digital conversion system, the signal output terminal of the analog-to-digital conversion system is connected with a vibration reflection signal input terminal of the processor, when the hub-type vibration sensor detects the railway track on the track monitoring vehicle, the hub-type vibration sensor is rolled on a to-be-detected ballastless track plate and detects the vibration signal reflected by the to-be-detected ballastless track plate. The structure defect rapid nondestructive test apparatus does not require a coupling agent, and has the advantages of simple structure and strong environment adaptation, and can realize rapid structure defect scanning under ballastless track on the high speed railway.

Description

technical field [0001] The invention relates to the technical field of service status and defect non-destructive detection of under-track structures of high-speed railways, in particular to a device and method for rapid non-destructive detection of structural defects under high-speed railways. Background technique [0002] my country's high-speed railway has been officially put into operation for a short time, and the research on ballastless track disease detection methods is relatively lagging behind. Due to its complex structure, high-speed railway foundations have various corresponding diseases and defects. Among them, the void at the bottom of the ballastless track support layer seriously threatens the safety of high-speed railway operation. At present, only Beijing Jiaotong University and various railway design institutes have carried out ballastless track subgrade disease detection. [0003] The non-destructive testing of ballastless track structure currently mainly ad...

AI Technical Summary

Problems solved by technology

[0003] The non-destructive testing of ballastless track structure currently mainly adopts two methods of ground penetrating radar and shock elastic wave testing. Because the ballastless track subgrade is usually closed with concrete as a whole, the gap between the bottom of the supporting layer and the foundation bed is very small, and some may only have millimeters. The detection resolution of ground penetrating radar is low, and it cannot meet the requirements of finding out the millimeter-level void state at the bottom of the ballastless track support layer; in addition, the bottom of the concrete support layer contains steel bars, which shield the radar electromagnetic wave signal and affect the void at the bottom of the support layer State Detection Accuracy

The shock elastic wave method is a method proposed by the Fourth Railway Survey and Design Institute Group Company to effectively detect the void at the bottom of the ballastless track support layer (patent number: ZL2015 1 0019699.0). Features and spectrum features to judge whether the ballastless track support layer is empty. At present, this method uses artificial small hammer to tap excitation, and point measurement method to collect data. To meet the requirements of rapid detection of high-speed rail, it is necessary to improve the shock elastic wave detection device and study the rapid detection device

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