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A Monitoring Method for Density Defects of Reinforced Sleeve Grouting Material Based on Piezoelectric Impedance Effect

A steel sleeve and piezoelectric impedance technology, applied in the direction of material impedance, can solve the problems of non-disclosure, and achieve the effects of accurate monitoring, easy operation, and small external interference

Active Publication Date: 2020-12-01
NINGBO UNIV
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Problems solved by technology

However, there are no relevant research reports on the monitoring method of the density defect of steel sleeve grouting material based on the piezo-electrical impedance effect at home and abroad.

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  • A Monitoring Method for Density Defects of Reinforced Sleeve Grouting Material Based on Piezoelectric Impedance Effect
  • A Monitoring Method for Density Defects of Reinforced Sleeve Grouting Material Based on Piezoelectric Impedance Effect
  • A Monitoring Method for Density Defects of Reinforced Sleeve Grouting Material Based on Piezoelectric Impedance Effect

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[0033] A monitoring method for the compactness defect of the grouting material of the reinforcement sleeve 1 based on the piezo-electrical impedance effect. Such as figure 1As shown, the basic principle is to pre-embed the piezoelectric ceramic sheet 2 in the middle of the surface of the non-defective, that is, grouted dense sleeve 1 and the defective, that is, grouted non-dense sleeve 1, and use the electromechanical coupling effect between the piezoelectric ceramic sheet 2 and the monitoring object. Measure the electrical admittance signal of the piezoelectric ceramic sheet 2. If there is a defect, that is, the grouting is not dense, compared with the sleeve 1 without defect, that is, the grouting is dense, the electrical admittance signal of the piezoelectric ceramic sheet 2 will change, and then qualitative and even quantitative Make judgments about defects. The monitoring method includes the following steps:

[0034] (1) Determination of the monitoring location: determi...

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Abstract

The invention discloses a piezoelectric impedance effect based compactness defect monitoring method for a reinforcement sleeve grouting material. The method has the characteristics as follows: piezoelectric ceramic pieces are pre-embedded in the surface of a sleeve connected with tensioned reinforcement, the piezoelectric ceramic pieces are connected with a precision impedance analyzer through fine and soft wires, the precision impedance analyzer applies voltage signals to the piezoelectric ceramic pieces, and by means of electromechanical coupling effect of the piezoelectric ceramic pieces and the sleeve, electric admittance signals fed back by the piezoelectric ceramic pieces are received; if a defect exists, sleeve grouting is uncompact, compared with the electric admittance signals ofthe sleeve with compact grouting, the electric admittance signals of the piezoelectric ceramic pieces can change, and compactness of the sleeve grouting is quantitatively judged by adopting RMSD (root-mean-square deviation) as a defect index. The method has the advantages that a sensor and an actuator are integrated, working efficiency is high, outside interference is low, whether the sleeve grouting is compact can be monitored accurately, stress performance of sleeve connection is not affected, and rapid and effective monitoring can be realized.

Description

technical field [0001] The invention relates to a method for monitoring the connection defect of beam-column joints of an assembled concrete structure, in particular to a method for monitoring the density defect of steel sleeve grouting material based on the piezoelectric impedance effect. Background technique [0002] In recent years, my country has vigorously developed prefabricated concrete structures, and as the most important method of beam-column joint connection of prefabricated concrete structures, steel sleeve grouting connection. If the grouting is not dense, the anchorage length of the stressed steel bar will be reduced, so the ultimate bearing capacity of the joint will not meet the design requirements, and the seismic performance will be greatly reduced. Therefore, it is very necessary to monitor the connection defects of beam-column joints of prefabricated concrete structures, that is, whether the sleeve grouting is dense. [0003] At present, the monitoring m...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/02
CPCG01N27/02
Inventor 李俊华陈文龙孙彬严蔚
Owner NINGBO UNIV
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