Ballastless track board disengaging nondestructive detection method based on elastic waves

A ballastless track and non-destructive testing technology, applied in the field of safety testing, can solve problems such as difficult frequency domain analysis, shallow detection depth, and low test efficiency

Active Publication Date: 2015-07-08
四川升拓检测技术股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0023] (1) During the test, it is necessary to couple the probe with the measured surface with a coupling agent such as butter, and the test efficiency is low
[0024] (2) The excitation signal has low energy and high signal frequency (generally above hundreds of KHz), which decays quickly in the track plate and the detection depth is shallow
[0026] (4) The linearity of the spectral response curve of the probe is poor, and it is difficult to perform fre

Method used

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  • Ballastless track board disengaging nondestructive detection method based on elastic waves
  • Ballastless track board disengaging nondestructive detection method based on elastic waves
  • Ballastless track board disengaging nondestructive detection method based on elastic waves

Examples

Experimental program
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Example Embodiment

[0079] Example 1:

[0080] In this embodiment, CRTS II type ballastless track slab (hereinafter referred to as type II) and CRTS III type ballastless track slab (hereinafter referred to as type III) are taken as examples to illustrate the present invention. Naturally, the present invention can also be used for void detection of other ballastless track plates with similar structures.

[0081] Parameters of various types of ballastless track slab filling layer

[0082]

[0083] The non-destructive testing method for the void of ballastless track slab based on elastic wave includes the following steps:

[0084] A. Determine the functional relationship between the frequency of the excited elastic wave and the elastic wave reflectivity of the void surface;

[0085] B. Determine the functional relationship between the frequency of the excited elastic wave and the elastic wave reflectivity of the filling layer;

[0086] C. According to the function relationship obtained in step A and step B, d...

Example Embodiment

[0166] Example 2:

[0167] The method for detecting the void rate of ballastless track slab based on elastic wave includes the following steps:

[0168] A. Divide grids on the top plate, each grid is a measuring point;

[0169] B. Use the method described in Example 1 to detect each measuring point separately;

[0170] C. Calculate the ratio of voided measuring points to all measuring points. This ratio is the voiding rate of the ballastless track slab.

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PUM

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Abstract

The invention discloses a ballastless track board disengaging nondestructive detection method based on elastic waves. By means of confirming a function relationship between shock excitation elastic wave frequency and disengaging surface elastic wave reflectance, a function relationship between the shock excitation elastic wave frequency and packing layer elastic wave reflectance is confirmed, the shock excitation elastic wave frequency which can make the ratio of the disengaging surface elastic wave reflectance to the packing layer elastic wave reflectance obtain the maximum value is found, shock excitation elastic wave with the frequency is directly stimulated, so that a disengaging surface reflected signal is in a state easiest to identify, and the disengaging judgment accuracy of a ballastless track board is greatly improved. On the basis, a judging standard whether the disengaging exits is provided at the same time. The invention further discloses a ballastless track board disengaging rate detection method based on the elastic waves.

Description

technical field [0001] The invention relates to the technical field of safety detection, in particular to a method for detecting empty space of a ballastless track slab. Background technique [0002] The ballastless track cancels the sleeper and ballast bed of the traditional ballast track, and uses the prefabricated reinforced concrete slab to directly support the rail, and fills the CA mortar or self-compacting concrete cushion between the top plate and the base, which is a new fully supported slab type track structure. It has the following advantages: good stability and smoothness; low building height and light weight, which can reduce the second phase load of bridges and reduce tunnel clearance; slow track deformation and good durability; no maintenance or less maintenance and low maintenance costs, etc. advantage. Ballastless track has very high requirements on engineering materials and basic civil engineering, so the initial construction cost is higher than that of b...

Claims

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Application Information

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IPC IPC(8): G01V1/00
Inventor 吴佳晔谢永江李化建易忠来朱纪刚姚鑫吴曾炜
Owner 四川升拓检测技术股份有限公司
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