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Nondestructive detection method for improving void detection precision of CRTS III-type track slab

A technology for non-destructive testing and testing accuracy, which is applied to measuring devices, railway vehicle shape measuring devices, and the use of sound waves/ultrasonic waves/infrasonic waves to analyze solids, etc. It can solve the problem that energy extremes cannot fully reflect repeatable test results, differences, peak Obvious problems, etc., to achieve the effect of reliable comparison results, strong reference, and high repeatability

Inactive Publication Date: 2019-11-08
四川升拓检测技术股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a non-destructive testing method that improves the detection accuracy of CRTSⅢ type track slabs, so as to solve the problem that in the detection method in the prior art, the reflection energy is averaged and the peak is not obvious, and the energy extreme value cannot fully reflect the real reflection. The problem of differences in position and repeatability test results, to achieve the purpose of improving the reliability and repeatability of test results

Method used

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  • Nondestructive detection method for improving void detection precision of CRTS III-type track slab
  • Nondestructive detection method for improving void detection precision of CRTS III-type track slab
  • Nondestructive detection method for improving void detection precision of CRTS III-type track slab

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Embodiment 1

[0038] A non-destructive testing method for improving the detection accuracy of CRTS III type track slab void detection, comprising the following steps:

[0039] (a) Arrange several measuring points on the track slab, and knock the whole track slab point by point along the measuring points;

[0040] (b) receiving the shock elastic wave signal generated after hitting the track plate;

[0041] (c) Perform sequence transformation and frequency spectrum analysis to extract the reflected signal from the bottom surface of the track slab and the reflected signal from the bottom surface of the self-compacting concrete;

[0042] (d) According to the ratio of the average reflected energy of the bottom surface of the track slab and the average reflected energy of the self-compacting concrete bottom surface, the degree of voiding is judged.

[0043] The peak value of the traditional detection method is not obvious after the reflection energy is averaged, and the repeatability test result...

Embodiment 2

[0046] Include the following steps.

[0047] 1. Determine the state of the tested CRTS III track slab (including: size, whether the surface is dry, etc.);

[0048] 2. Use the signal excitation device to stimulate the signal, so that the signal propagates inside the CRTS III track plate under test;

[0049] 3. Use the signal receiving device to receive the signal that has propagated inside the CRTS III track slab;

[0050] 4. Tap the entire CRTS III track plate point by point along the measuring point;

[0051] 5. Use special analysis software to analyze the received signals, and set parameters such as sequence transformation, spectrum analysis, slice range, slice contour map, etc. for all the obtained signals;

[0052] 6. Spectrum analysis is set to use MEM (Maximum Entropy Method) for analysis, and the sampling interval is calculated at 0.001ms.

[0053] 7. By controlling the ratio of the average energy value reflected by the slice range, the void situation of the CRTS III...

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Abstract

The invention discloses a nondestructive detection method for improving the void detection precision of a CRTS III-type track slab. The nondestructive detection method comprises the following steps: (a) arranging a plurality of measuring points on the track slab, and knocking the whole track slab point by point along the measuring points; (b) receiving an impact elastic wave signal generated afterknocking the track slab; (c) carrying out number sequence transformation and frequency spectrum analysis, and extracting a reflection signal of the bottom surface of the track slab and a reflection signal of the bottom surface of self-compacting concrete; (d) judging the void degree according to the ratio of a mean value of reflected energy of the bottom surface of the track slab to a mean valueof reflected energy of the bottom surface of the self-compacting concrete. The invention aims at providing a nondestructive detection method for improving the void detection precision of the CRTS III-type track slab, solving the problem that in a detection method in the prior art, a peak value after reflected energy averaging is not obvious and an extreme energy value cannot completely reflect that a real reflection position and a repeatability test result are different, and achieving the purpose of improving the reliability and the repeatability of a test result.

Description

technical field [0001] The invention relates to the field of railway engineering quality and safety detection, in particular to a non-destructive detection method for improving the detection accuracy of a CRTS III type track slab void. Background technique [0002] With the rapid development of China's high-speed railway construction, the CRTS III track slab with independent intellectual property rights in my country has been applied and practiced on several passenger dedicated railways, but there is no testing technology combined with it in the field of engineering non-destructive testing . [0003] The overall structural scheme of CRTS Ⅲ slab-type ballastless track is a new unitary slab-type ballastless track structure with shoulders, which mainly consists of steel rails, fasteners, prefabricated track slabs, self-compacting concrete, limit stops, and intermediate isolation layers (geotextiles) It is composed of reinforced concrete base and other parts. Due to the complex...

Claims

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Application Information

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IPC IPC(8): G01N29/04G01N29/22B61K9/08
CPCB61K9/08G01N29/045G01N29/22G01N2291/0234
Inventor 吴佳晔刘涛张益雄杨森邓立刘秀娟陈秀秀王伟杨玲陈靓
Owner 四川升拓检测技术股份有限公司
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