Professor Daichi Chiba of the Institute of Scientific and Industrial Research, Osaka University has developed a new method for non-destructive and instant diagnosis of the position, depth, thickness, breakage, etc. of reinforcing bars buried in concrete.
There have been several methods for non-destructive finding of buried reinforcing bars, but many detect not only reinforcing bars but also non-magnetic metals such as electric wires and pipes and cavities at the same time.In addition, other methods also have problems such as being limited to inspection when the reinforcing bar is broken and requiring a strong electromagnet.
This time, Professor Chiba developed a device in which a magnetic sensor is placed near a permanent magnet, and when a concrete wall with embedded reinforcing bars is traced, the sensor detects changes in the magnetic field with high sensitivity and is buried. A method that can instantly diagnose the position, depth, thickness, breakage status, etc. of reinforcing bars.It utilizes the fact that the magnetic field around the magnet changes when the reinforcing bar approaches the permanent magnet, and it is possible to make a diagnosis by accurately and accurately grasping the target reinforcing bar while being simple.
Professor Chiba's prototype testing machine has a mechanism in which the dedicated software instantly estimates the position and depth of the reinforcing bar at the same time as the measurement is completed and notifies the user, in addition to information such as the position of the reinforcing bar, the surrounding reinforcing bars. It was proved that it is possible to instantly, accurately and visually identify the difference in appearance and the diagnosis of the fractured part.
With the increasing importance of technology for grasping the soundness of buried reinforcing bars in a non-destructive and instant manner for the prevention and maintenance of aging infrastructure such as bridges and tunnels, this technology based on a simple structure and principle enables inexpensive reinforcing bars. We can expect the realization of a spacecraft.Furthermore, in the future, it is said that it is aiming to build a technology that three-dimensionally visualizes the sound state including the buried structure of the reinforcing bar and the corroded state, and further development of this technology is expected.
reference:[Osaka University] Diagnose buried reinforcing bars by skillfully using permanent magnets
