Electromagnetic interference preventing embedded type multifunctional piezoelectric intelligent aggregate of concrete structure

Abstract

The invention discloses electromagnetic interference preventing embedded type multifunctional piezoelectric intelligent aggregate of a concrete structure, which comprises a metal shielding base, a metal shielding cover, d33 mode piezoelectric ceramic chips, an insulating rubber ring, a conducting strip, an epoxy resin insulating layer, a shielding lead and a shielding joint, wherein positive electrodes of the two piezoelectric ceramic chips are arranged face to face; the conducting strip is placed between the positive electrodes of the two piezoelectric ceramic chips; the conducting strip is welded with the positive electrode of the shielding lead to form a whole; a peripheral shielding line of the shielding lead is welded with the metal shielding base to form a whole; the side surfaces of the piezoelectric ceramic chips are banded by utilizing the insulating rubber ring; the metal shielding base is connected with the metal shielding cover to form a whole through a screw thread, and certain precompression is applied to the upper surface and the lower surface of the whole; after the connecting parts of the metal shielding base and the metal shielding cover are welded, an epoxy resin insulating waterproof layer is coated on a metal shell; and after the metal shell is air-dried after 24 hours, the piezoelectric intelligent aggregate is formed. Certain coarse sand can be pasted tothe metal shell when the epoxy resin is coated on the outer part of the metal shell, so as to guarantee good compatibility between a sensor and concrete. The piezoelectric intelligent aggregate has the advantages of remarkable shielding effect, interference exemption of a concrete internal stress field, overall process monitoring of concrete internal dynamic damage evolution, explicit force bearing path, simple structure and low construction cost.

Description

technical field [0001] The invention relates to a multifunctional piezoelectric intelligent aggregate for an embedded concrete structure free from electromagnetic interference, especially capable of monitoring normal stress in the process of concrete dynamic damage and actively monitoring internal defects of the concrete structure. Background technique [0002] Concrete structures are civil engineering structures with a large volume and a wide area. During service, they may be subjected to dynamic catastrophes such as earthquakes, typhoons, and collisions, resulting in structural damage. Therefore, timely and accurate structural detection is very important for the decision-making of structural maintenance and reinforcement. At present, there are many local damage detection methods for structures, such as ultrasonic method, acoustic emission, infrared thermal imaging method, rebound method, isotope detection method, etc. The shortcomings of these detection methods are: (1) th...

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the problems of the existing concrete damage monitoring sensors in the electromagnetic shielding effect, the reliability of the stress transmission path, and the stability of high stress level performance, the present invention proposes a multifunctional piezoelectric intelligent aggregate for embedded concrete structures free from electromagnetic interference. , the invention effectively solves the above problems, and is simple to manufacture, stable in performance, low in price, and easy to be popularized and applied in the field of civil engineering

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