CN-121994922-A - FRP repaired hydraulic concrete structure interface debonding detection equipment and method

CN121994922ACN 121994922 ACN121994922 ACN 121994922ACN-121994922-A

Abstract

The invention discloses an FRP repairing hydraulic concrete structure interface debonding detection device and a method thereof, and relates to the field of hydraulic engineering intelligent operation and maintenance, wherein the device comprises a probe and a host, the probe is integrated with acoustic detection and piezoelectric ceramic implantation functions, a debonding region can be scratched on the surface of the FRP and is quickly and initially screened through abnormal acoustic signals, and then a piezoelectric ceramic sensor and a matched curing agent are accurately implanted into the debonding position by using the same probe to form a long-term monitoring detection point; the method realizes the integrated operation flow from rapid initial detection, fixed point implantation and key detection. The invention realizes reliable implantation and stable signal acquisition of piezoelectric ceramics, solves the problems of detection, long-term monitoring and later detection dislocation of the traditional method, and has the advantages of high integration level, long-term fixed-point tracking and strong applicability.

Inventors

SHAN CHANGXI
HU SHAOWEI
YE YUXIAO
SUN PANXU
ZHAO YAHONG

Assignees

六合郑大科学技术转化中心
郑州大学

Dates

Publication Date: 20260508
Application Date: 20260211

Claims (6)

1. The device is characterized by comprising a probe (1) and a host machine (2), wherein the probe (1) generates an acoustic signal by scratching the surface of the FRP (3), and the abnormal acoustic signal caused by an interface debonding area (5) generated by a hydraulic concrete structure (4) at the lower part of the FRP (3) is received and identified by the host machine (2).
2. The FRP-repaired hydraulic concrete structure interface debonding detection device according to claim 1, wherein the probe (1) comprises a piezoelectric ceramic lead (11), a piezoelectric ceramic push valve (12), a curing agent push plate (13), a piezoelectric ceramic integrated core (14), a loose-leaf seal (15), an injection needle port (16), a curing agent mixing cavity (17), a curing agent extrusion valve (18), a curing agent accommodating cavity (19) and a curing agent push valve (110); The device comprises a piezoelectric ceramic integrated core (14), a piezoelectric ceramic lead (11), a piezoelectric ceramic push valve (12), a curing agent push plate (13), a curing agent push valve (18) and a curing agent mixing cavity (17), wherein the piezoelectric ceramic lead (11) is connected with the tail end of the piezoelectric ceramic integrated core (14) and is used for transmitting an FRP (3) surface acoustic signal to a host machine (2), the piezoelectric ceramic push valve (12) is connected with the piezoelectric ceramic integrated core (14) and is used for pushing piezoelectric ceramic (145) on the piezoelectric ceramic integrated core (14) into an interface debonding area (5), the curing agent push plate (13) is arranged in a curing agent accommodating cavity (19), the top end of the curing agent push plate is connected with the curing agent push valve (110) and is used for pushing the curing agent out of the curing agent push valve (18) and into the curing agent mixing cavity (17), the curing agent is extruded from an injection needle opening (16) and is pushed into the interface debonding area (5) after the curing agent mixing, and a loose-leaf seal (15) is positioned at the head of the piezoelectric ceramic integrated core (14), and can rotate and seal the curing agent mixing cavity (17) to an injection needle opening (16) in the process of the piezoelectric ceramic (145) in the extruding process.
3. The FRP repair hydraulic concrete structure interface debonding detection apparatus of claim 1, characterized in that the piezoceramic integrated core (14) further comprises a piezoceramic integrated core housing (141), a rotation shaft (142), piezoceramic push teeth (143), a spring (144) and piezoceramic (145); The piezoelectric ceramic integrated core shell (141) is internally fixed with a rotating shaft (142) for fixing the top ends of piezoelectric ceramic pushing teeth (143) to enable the piezoelectric ceramic pushing teeth (143) to rotate around the rotating shaft (142), a spring (144) is connected with the back sides of the two piezoelectric ceramic pushing teeth (143) and used for resetting the piezoelectric ceramic pushing teeth (143), the piezoelectric ceramic integrated core shell (141) is sleeved with a plurality of piezoelectric ceramics (145), and after the piezoelectric ceramic pushing teeth (143) push one piezoelectric ceramic (145), the piezoelectric ceramics (145) are reset and then pushed.
4. A FRP repair hydraulic concrete structure interface debonding detection method comprises the following steps: S1, connecting a probe (1) with a host machine (2), after starting equipment, lightly scratching the FRP (3) on the surface of a hydraulic concrete structure (4) by the handheld probe (1), and synchronously collecting acoustic signals; S2, determining and marking a specific debonding position by adopting methods such as pressing, observing and the like according to the position of the obvious abnormal acoustic signal, and then disconnecting the probe (1) from the host (2) and converting into a piezoelectric ceramic (145) implantation mode; S3, penetrating an injection needle opening (16) into the interface debonding area (5), injecting a curing agent, then injecting piezoelectric ceramics (145), and sealing; s4, connecting the piezoelectric ceramic lead (11) with the host machine (2), checking the normal operation condition of the embedded piezoelectric ceramic (145), and then packaging the piezoelectric ceramic lead (11); s5, detecting a plurality of embedded piezoelectric ceramics (145) in a region connected with the host (2) periodically, and checking the change condition of interface debonding.
5. The method for detecting the interfacial debonding of the FRP repaired hydraulic concrete structure according to claim 4, wherein the detection of the interfacial debonding of the FRP repaired hydraulic concrete structure is not only the initial detection of the probe (1) which is scratched by the FRP (3), but also the key detection after the piezoelectric ceramic (145) is put in.
6. The method for detecting the interfacial debonding of the FRP repaired hydraulic concrete structure according to claim 4, wherein the injected curing agent simultaneously plays a role in repairing the debonding interface and fixing the piezoelectric ceramic (145) in the process of placing the piezoelectric ceramic (145), and the placed piezoelectric ceramic (145) simultaneously plays a role in detecting the interfacial debonding and supporting a framework serving as a repairing material.

Description

FRP repaired hydraulic concrete structure interface debonding detection equipment and method Technical Field The invention belongs to the field of intelligent operation and maintenance of hydraulic engineering, in particular to a method for detecting the repairing performance of a hydraulic concrete structure, and particularly relates to FRP repairing hydraulic concrete structure interface debonding detection equipment and method. Background In the long-term maintenance of hydraulic engineering infrastructure, the hydraulic concrete structure is easy to be damaged due to environmental erosion, load fatigue, material aging and the like, and the adoption of fiber reinforced composite (FRP) for pasting and reinforcing has become a common repairing means. The FRP repairing technology can effectively improve the bearing capacity and durability of the structure, but the repairing effect of the FRP repairing technology depends on the bonding integrity of an interface between the FRP and the concrete base to a great extent. The interface debonding is a common disease form in FRP reinforcement systems, and once the disease form occurs, the repair effect is obviously reduced, even reinforcement failure is caused, and the structural safety is threatened. At present, the detection method for the FRP repair layer interface debonding mainly comprises traditional nondestructive detection means such as a knocking method, infrared thermal imaging and ultrasonic detection. Although the method can identify the debonded area to a certain extent, the method still has obvious limitations that the knocking method depends on manual experience, has strong subjectivity and is difficult to quantify, the infrared thermal imaging is greatly influenced by the environment temperature and the surface state, the applicability is limited in a complex hydraulic environment, the ultrasonic detection has high requirements on the surface flatness and the coupling condition, and the method can only generally realize single point measurement or local scanning and is difficult to realize long-term and dynamic interface state monitoring. More importantly, the existing method is mostly limited to a detection-identification stage, can not repair the interface in time when debonding is found, and can not continuously sense and evaluate the repaired interface state, so that repair and maintenance work is still in a backward mode of passive response and repeated detection. Therefore, an intelligent method for realizing integration of detection-repair-focus detection is needed, so that the reliability and the full-life maintenance efficiency of the FRP detection system are improved. According to the inspection, the disclosed technology related to the FRP repairing hydraulic concrete structure interface debonding detection is not few, but the related technology for claiming to follow-up important detection of the interface debonding is not inspected. The published relevant schemes are now listed: Chinese patent publication No. CN120971576A discloses a phased array ultrasonic interface debonding detection method for a multilayer curved surface bonding structure, which can accurately judge the interface debonding defect. The Chinese patent with publication number of CN118090829A discloses a nondestructive testing method and equipment for the debonding defect of fiber cloth, realizes the detection of the bonding condition of FRP, improves the detection rate and the detection accuracy of the debonding defect, and improves the detection efficiency. The Chinese patent publication No. CN114235957B discloses a method for detecting the interfacial debonding defect of a multi-layer bonding structure, which realizes the accurate judgment of the debonding defect and solves the problems of low accuracy and difficult detection of the judgment of the type of defects of knocking detection and ultrasonic detection. The Chinese patent publication No. CN112577933B discloses a fluorescence detection method for the interfacial debonding of a fiber reinforced polymer composite material, which can rapidly, accurately and visually detect whether the fiber reinforced polymer composite material has debonding damage. The above disclosed techniques are directed to how to efficiently measure interface debonding, but neglect subsequent focus detection of the debonded area, and do not provide an integrated "detection-repair-focus detection" apparatus and method for use. Therefore, there is an urgent need for a device and a method for detecting the interface debonding of the hydraulic concrete structure for repairing the FRP, which can realize the detection-repair-key detection of the interface debonding of the hydraulic concrete structure for repairing the FRP. Disclosure of Invention The invention aims to provide FRP repairing hydraulic concrete structure interface debonding detection equipment and method, so as to solve the problems in the background technology. In order to achieve t