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Tunnel lining non-destructive testing method based on audio frequency analysis

A non-destructive testing and tunneling technology, which is applied in the analysis of materials, the use of sound waves/ultrasonic waves/infrasonic waves to analyze solids, and the use of sound waves/ultrasonic waves/infrasonic waves for material analysis. It can solve the problems of no quantitative standards and low detection accuracy, and achieve scientific detection. , the effect of accurate test results

Active Publication Date: 2019-07-23
四川升拓检测技术股份有限公司
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Problems solved by technology

[0008] Aiming at the above-mentioned problems such as too high subjectivity, no quantitative standard, and low detection accuracy of the existing tunnel lining surface defect detection methods, the present invention proposes a nondestructive detection method based on audio frequency analysis, which can perform nondestructive detection of lining surface defects, and has the advantages of Convenient, efficient and accurate features

Method used

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  • Tunnel lining non-destructive testing method based on audio frequency analysis
  • Tunnel lining non-destructive testing method based on audio frequency analysis

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Embodiment

[0027] A tunnel lining non-destructive testing technology based on audio frequency analysis, comprising the following steps:

[0028] A smart phone with audio signal processing software is used to sample the percussion audio frequency generated by the exciter hammer striking the tunnel lining at a given sampling frequency to obtain the tunnel lining percussion audio signal; the percussion audio signal includes the exciter The ambient audio signal before the vibrating hammer is struck, and the audio signal after the vibrating hammer is struck. It should be noted that the mobile terminal with the recording function can be a mobile phone, a tablet computer, a tape recorder, a microphone with a storage function, etc., and this embodiment preferably adopts a mobile phone commonly used at present, and loads a simple APP (application software) to It is convenient to record the percussion audio signal, and can convert the percussion audio signal into a digital signal for interception ...

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Abstract

The invention relates to the technical field of road engineering quality detection, in particular to a tunnel lining non-destructive testing method based on audio frequency analysis, which aims to provide an efficient and accurate non-destructive testing method for tunnel linings. The technical solution adopted is as follows: the following steps are included: acquiring a tunnel lining tapping audio signal at a given sampling frequency by using a mobile terminal with a recording function; trimming the tapping audio signal to retain an effective signal; calculating a calibration threshold according to the effective signal parameters; calculating a test point void index according to the effective signal parameters; comparing the void index with the calibration threshold; and determining the tunnel lining quality according to the comparison result. The invention can carry out non-destructive testing on the surface defects of the lining, and has the characteristics of convenience, high efficiency and accuracy.

Description

technical field [0001] The invention relates to the technical field of road engineering quality detection, in particular to a nondestructive detection method for tunnel lining based on audio frequency analysis. Background technique [0002] In construction projects, the use of concrete is essential, especially in existing buildings, where most structural beams, columns, piers, piles, etc. need to be used. Therefore, the quality of concrete directly affects the durability and safety of building structures. Especially for tunnel engineering, the quality of concrete restricts the economic and social benefits of tunnel engineering. If the construction technology is not standardized, the process is not strict or the management is improper, the thickness of the tunnel lining will be insufficient, the contact between the lining and the surrounding rock will not be dense, and there will be safety problems such as voids, deformation and cracks of the lining, water leakage, and even f...

Claims

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Application Information

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IPC IPC(8): G01N29/04G01N29/12
CPCG01N29/045G01N29/12
Inventor 吴佳晔罗技明吴宁远冯源刘秀娟邓立华容如
Owner 四川升拓检测技术股份有限公司
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