| Title | Development of the Bridge Failure Alarm System (II) |
| Dept | Transportation Engineering, Maritime and Air Transport Division |
| Year | 2012 |
| Month | |
| Price | |
| Summary | Bridges are critical facilities of the transportation system. The standard operating procedure of bridge shutdown was established by the government agency to ensure the safety of bridge users and minimize possible damage when the bridge collapses or has a high risk of collapsing. However, during the high-water season, it is difficult to monitor the state of each bridge in real time with a limited number of staff. In order to solve this problem, the project “Development of the Bridge Failure Alarm System” was carried out by the Institute of Transportation of the Ministry of Transportation and Communication in 2010. Three alarm systems based on different technologies were proposed to respond immediately to bridge failure and inform bridge users and government agencies to minimize potential harm.
This project is an extension of the previous project to further improve the bridge failure alarm system such that these systems can be successfully popularized in local government road-maintaining agencies. The aim of this project was to improve the accuracy, stability and reliability and to simplify the installation, calibration, and maintenance of these three proposed systems. These alarm systems include (1) Series Extension Detection Device (SEDD), (2) Time Domain Reflectometry (TDR) and (3) Simple Open Circuit Detector (SOCD). For the SEDD system, the original location detection based on voltage drop was replaced by an RS485 circuit to simplify the installation and configuration. Additionally, the detecting wire in the SEDD was doubled to reduce possible false alarms and provide early warning of anomalies with the shorter wire. The SEDD system was also modulized to increase reliability and durability. USB TDR was used to solve the time delay problem and allow an instant reaction in the TDR system. For the SOCD system, a redundant circuit was added to increase the reliability and a message sender triggered by a simple Relay is now equipped to allow remote notification. Furthermore, a Relay switch was used to trigger the alarm signs to simplify the installation. A field test for the more practical methods (SEED and SOCD) was conducted to verify the durability and reliability of the established systems. These two systems were installed in MeiLain Bridge in Miaoli County. According to the testing results, the improved systems not only reduce the time for installation, but also increase reliability and convenience. In the long term, the results of the field test will be used as guidance for future popularization to the governmental round-maintaining agencies. |
| Post date | 2012/10/29 |
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