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Grouting sleeve grouting defect detection method based on sound wave local resonance scattering characteristics

A grouting sleeve and local resonance technology, which is applied in the direction of material analysis, measuring device, and instrument using sonic/ultrasonic/infrasonic waves, to achieve the effect of simple process, improved accuracy, and elimination of artificial errors or contact surfaces.

Active Publication Date: 2020-12-18
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no effective detection method to detect the grouting quality of the steel bar connection sleeve

Method used

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  • Grouting sleeve grouting defect detection method based on sound wave local resonance scattering characteristics
  • Grouting sleeve grouting defect detection method based on sound wave local resonance scattering characteristics
  • Grouting sleeve grouting defect detection method based on sound wave local resonance scattering characteristics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1 judges whether it is empty through a mathematical model

[0042] (1) Establish the finite element model of the steel sleeve grouting structure, simulate the typical steel sleeve grouting defects to select the material model, and set the elastic modulus (E), density (ρ), Poisson’s ratio (v) of the relevant materials according to the actual situation ), the finite element model of the steel sleeve grouting structure is established in COMSOLMultiphysics, and the typical steel sleeve grouting defects are simulated, such as figure 2 , image 3 As shown, the material parameters used are shown in Table 1.

[0043] Table 1

[0044] E(GPa) ρ(kg / m) v concrete 33 2600 0.2 Steel Pipe 200 7850 0.3

[0045](2) In COMSOL Multiphysics, before exciting the sound wave, it is necessary to set the energy A of the exciting signal, the frequency of the half-sine function, and the position of the exciting point, etc. figure 2 and image 3...

Embodiment 2

[0054] Embodiment 2 judges whether it is empty by physical experiment

[0055] In this embodiment, a TH402 bellows grouting quality non-destructive tester is used for acoustic detection and analysis.

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Abstract

The invention discloses a grouting sleeve grouting defect detection method based on sound wave local resonance scattering characteristics, which comprises the following steps: carrying out sound wavedetection outside a to-be-detected part on the same side of a grouting sleeve, and carrying out data processing on an obtained original echo signal to obtain a pulse upper envelope diagram; and extracting a sound wave local resonance scattering attenuation characteristic parameter alpha after data formula fitting, so that whether void or void exists in the sleeve or not is judged. Compared with the prior art, the detection method provided by the invention has the advantages that the process is simple, the labor intensity of workers is effectively reduced, the personnel allocation amount is reduced, the tedious working process is reduced, the detection method is different from the traditional detection of void sound velocity and sound time angle, the detection is carried out from the perspective of energy attenuation, and the measurement accuracy can be improved.

Description

technical field [0001] The invention belongs to the field of engineering technology detection, in particular to a method for detecting grouting defects of grouting sleeves based on the local resonance scattering characteristics of acoustic waves. Background technique [0002] The prefabricated concrete structure building is an industrialized building constructed by prefabricating the main components in the factory, assembling them at the construction site, and then connecting the components together through a small amount of cast-in-place operations. Sleeve grouting connection of steel bar is an important connection method of stressed steel bars in this structure, and the connection joint is composed of three parts: ribbed steel bar, sleeve and grouting material. The connection principle is: the ribbed steel bar is inserted into the sleeve, and the non-shrinkage or micro-expansion cement-based grouting material is poured into the sleeve to fill the gap between the sleeve and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/032
CPCG01N29/032G01N2291/015G01N2291/02416Y02A90/30
Inventor 龙士国李德辉
Owner XIANGTAN UNIV
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