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Nondestructive testing method for open joint of track plate

A non-destructive testing, track slab technology, applied in measuring devices, using sonic/ultrasonic/infrasonic waves to analyze solids, and using sonic/ultrasonic/infrasonic waves for material analysis, etc. Achieve the effect of strong signal restoration ability, high sampling accuracy and strong filtering ability

Pending Publication Date: 2020-04-28
四川陆通检测科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the detection effect of the existing track slab is not good, the invention provides a non-destructive testing method for the track slab to be separated

Method used

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  • Nondestructive testing method for open joint of track plate
  • Nondestructive testing method for open joint of track plate
  • Nondestructive testing method for open joint of track plate

Examples

Experimental program
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Effect test

Embodiment 1

[0033] A non-destructive testing method for track slab separation, comprising the following steps:

[0034] A. Preset or under the same working conditions on the project site, the track slab with a gap is used as a standard sample, and multiple measuring points are arranged at the position where the track slab has a gap, and the impact generated at the gap is received by knocking along the measuring point elastic wave signal.

[0035] B. Utilize spectrum analysis to extract the shock elastic wave signal tested in step A, and get the spectrum characteristic value according to the spectrum value of the shock elastic wave at each measuring point;

[0036] C. Arrange a number of measuring points on the track plate to be tested, and coordinate the measuring points, and receive the shock elastic wave signal generated by point-by-point tapping;

[0037] D. Use spectrum analysis to calculate the spectrum value of the test signal of the track plate, compare and analyze its spectrum va...

Embodiment 2

[0039] This embodiment is on the basis of embodiment 1:

[0040] In step D, if the spectrum value of the track slab test signal after spectrum analysis is greater than the characteristic value of the standard spectrum, it is judged that there is no gap in the track slab, and if it is smaller than the characteristic value of the spectrum, it is judged that the track slab has defects.

[0041] The planar imaging refers to displaying the comparison result of the spectrum value of the corresponding measuring point and the spectral feature value in the coordinate system through contrasting colors, and using a transitional color display between two adjacent measuring points. Transition colors are used to display between adjacent two measurements with different comparison results.

Embodiment 3

[0043] This embodiment is on the basis of embodiment 1:

[0044] The spectrum analysis uses the maximum entropy method.

[0045] The spectrum characteristic value of the B step is the average value of the spectrum values ​​of the shock elastic wave at each measuring point.

[0046] When comparing the spectrum value of the track slab to be tested with the characteristic value of the spectrum, due to the differences in the structure of the track slab under different working conditions, such as the difference in thickness, position and angle of the track slab to be tested, the spectrum during comparison The value of the characteristic value will be adaptively adjusted according to the actual situation.

[0047] In step C, the distance between several measuring points should be 15-35cm.

[0048] Arrange the acceleration sensor on the measuring point, and tap the measuring point arranged on the surface of the track plate successively with a vibrating hammer or an automatic vibrat...

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Abstract

The invention discloses a nondestructive testing method for an open joint of a track plate, which comprises the following steps: presetting a track plate with an open joint under the same working condition of an engineering field as a standard sample, arranging a plurality of measuring points at the position of the open joint of the track plate, and receiving impact elastic wave signals generatedat the open joint; extracting the impact elastic wave signals by utilizing spectrum analysis, and taking a frequency spectrum characteristic value according to the frequency spectrum value of the impact elastic waves of each measuring point; arranging a plurality of measuring points on a track plate to be measured, carrying out coordinate positioning on the measuring points, and receiving impact elastic wave signals generated by point-by-point knocking; and calculating a frequency spectrum value of a signal tested by the track plate, comparing and analyzing the frequency spectrum value with the frequency spectrum characteristic value, and carrying out plane imaging on all the measuring points to obtain a distribution state plane graph of the open joint area of the whole track. The open joint and open joint damage of the adjusting layer of a ballastless track can be efficiently and quickly identified.

Description

technical field [0001] The invention relates to the technical field of high-speed rail track slab detection, in particular to a non-destructive testing method for track slab separation. Background technique [0002] At present, ballastless track slabs are widely used in the construction of high-speed railways in my country. Compared with the ballasted track, the ballastless track slab has the advantages of better ride comfort, comfortable driving, and high speed. However, the damage of the adjustment layer of the ballastless track slab will cause separation or structural fatigue damage between the track slab and the adjustment layer under the action of traffic load and temperature stress. Excessive seam area or damage to certain structures will affect the running of the train and pose a hazard to driving safety. Therefore, it is of great significance to the operation of high-speed rail to effectively detect the separation of track slabs, find problems early, and deal with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04G01N29/30
CPCG01N29/04G01N29/30G01N2291/0234
Inventor 姚鑫楚海强
Owner 四川陆通检测科技有限公司
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