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A non-destructive testing method for tunnel lining based on audio frequency analysis

A non-destructive testing and lining technology, which is applied in analyzing materials, analyzing solids using sonic/ultrasonic/infrasonic waves, and using sonic/ultrasonic/infrasonic waves for material analysis. Accurate, test the effect of science

Active Publication Date: 2022-05-17
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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  • A non-destructive testing method for tunnel lining 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 non-destructive detection method for tunnel lining based on audio frequency analysis, and aims to provide an efficient and accurate non-destructive detection method for tunnel lining; the adopted technical scheme is: including the following steps, using The mobile terminal with recording function acquires the tunnel lining knocking audio signal at a given sampling frequency; cuts the knocking audio signal to retain the effective signal; calculates the calibration threshold according to the effective signal parameters; calculates the test point according to the effective signal parameters void index; compare the void index with the calibration threshold; determine the tunnel lining quality based on the comparison result. The invention can carry out non-destructive detection on the defects of the lining surface layer, 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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Patent Type & Authority Patents(China)
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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