Maintenance of Roads and Bridges Using IoT and Sensor Technologies

 

Overview

Japan is known for its well-developed infrastructure. Of course, there are occasional issues, but the recovery from these problems is swift, and there is a strong awareness of the challenges posed by such troubles. In recent years, there have been notable examples of road and bridge maintenance utilizing IoT and sensor technologies, and here are three representative cases.

1. Remote Monitoring of Cable Tension in Cable-Stayed Bridges Using Wireless Sensors

Traditionally, measuring the cable tension in cable-stayed bridges required traffic regulations and the removal of vibration-damping devices. However, by using wireless acceleration sensors and gateway devices, it became possible to measure the natural vibration frequency of the cables and estimate the tension without the need for traffic control. This system is battery-powered and can operate continuously for about five years. The gateway device, which combines solar power and rechargeable batteries, also eliminates the need for communication wiring. 

2. Bridge Health Monitoring System Visualizing Bridge Integrity

A monitoring system that combines acceleration sensors, IoT cameras, and infrared sensors has been installed on bridges in use. This system visualizes the deflection of the main girder, providing a method for evaluating the health of the structure. It is expected that this system will improve the determination of aging deterioration and the efficiency of maintenance and management. 

3. Continuous Monitoring of Displacement and Temperature in Small Bridges Using IoT Sensors

For small bridges managed by local governments, simple sensors that measure displacement and temperature 24/7 have been installed. These sensors are monitored remotely through the IoT infrastructure monitoring service "Infra Eye." This initiative reduces the burden of on-site inspections and enables early detection of anomalies. 

What do you think? Recently, a small hole appeared in the road near my neighborhood due to subsidence, and the area was temporarily closed off. However, the hole was filled in, and the repair was completed very quickly the next day. That said, labor shortages remain a challenge, so I hope technology can continue to be used efficiently to maintain infrastructure.

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