Reinforced concrete structure health monitoring system
A health monitoring system, reinforced concrete technology, applied in measuring devices, instruments, and analysis of solids using sonic/ultrasonic/infrasonic waves, etc., can solve problems such as fragile and difficult to replace, non-integration of sensor concrete, monitoring system failure, etc.
Active Publication Date: 2021-10-26
TONGJI UNIV
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Problems solved by technology
High-strength materials are used to wrap and protect the piezoelectric film, and they are completely embedded in the concrete structure. Once the sensing unit fails after the monitoring system is built, it will be easily damaged and difficult to replace, resulting in failure or even paralysis of the entire monitoring system.
[0006] In the field of civil engineering structural health monitoring, the existing sensors have problems such as incompatibility with concrete, easy damage and difficult replacement, and the lack of an intelligent monitoring system that can operate stably for a long time
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[0033] In order to solve the problems in the field of health monitoring of civil engineering structures such as incompatibility between sensors and concrete, easy damage and difficult replacement, lack of an intelligent monitoring system that can operate stably for a long time in reinforced concrete structures, etc., the present invention develops a system that can be used for internal damage diagnosis of reinforced concrete structures. Implantable piezoelectric sensor module and monitoring system. The implantable module is composed of piezoelectric ceramic (PZT) spherical shell, metal copper tube, grouting material, end plate, metal handle and aviation plug. The piezoelectric spherical shell is connected with the copper tube to form a "ball-and-stick" piezoelectric sensing unit. The six groups of units are symmetrically distributed in space. The grouting material is used as a matrix to pour and package a square module to protect the piezoelectric sensing unit. Implant two or ...
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Abstract
A reinforced concrete structure health monitoring system is characterized by comprising a plurality of modules which are embedded in a wall body in advance and distributed in different shear wall to-be-monitored areas, and the plurality of modules can be used as signal receiving units of the system and can also be used as signal transmitting units of the system; all the modules are connected with a multifunctional piezoelectric signal detection and analysis system and a signal modulation amplifier outside the structure at the same time, so that the monitoring system is constructed. The working process of the system comprises the steps that a detection signal is generated through the multifunctional piezoelectric signal detection and analysis system, the signal is transmitted in a to-be-detected structure after being amplified, carried damage information is transmitted to the multifunctional piezoelectric signal detection and analysis system, the output signal and the output detection information are subjected to before and after comparative analysis, and finally, the damage position and the damage degree are determined. The system comprises the beneficial effects that the system can be inserted into a structure to fuse a sensor with a concrete structure, can work stably for a long time, can be pulled out safely, and is convenient for regular replacement and maintenance.
Description
technical field [0001] The field of health monitoring of civil engineering structures. Background technique [0002] Rapid detection and accurate diagnosis of internal damage of reinforced concrete structures has always been a difficult problem in the field of civil engineering. Research and development of new intelligent sensing devices and monitoring systems compatible with concrete structures and suitable for complex nonlinear environments, and health monitoring and diagnosis of internal damage of civil engineering structures in service have become an important direction of future development. [0003] Piezoelectric ceramic sensors are widely used in structural health monitoring. The implantable sensing module is composed of piezoelectric ceramic spherical shells and high-strength protective materials. [0004] One of the closest existing technologies: externally attached piezoelectric sheets. Deployed on the surface of the structure, the structural information collecte...
Claims
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IPC IPC(8): G01N29/06G01N29/24
CPCG01N29/0654G01N29/245
Inventor杨子谦孔庆钊陈清军
OwnerTONGJI UNIV