Condition Based Monitoring on a Storm Surge Barrier
The Maeslantkering is one of the main storm surge barriers in the Netherlands and a structural marvel. The barrier is a crucial element in the protection of Rotterdam from flooding.
In 2007 the hydraulic drive system of the barrier wall was scheduled for the first large maintenance. Even though the hydraulic pumps had limited running hours the condition was not as expected. HVR Engineering advised Rijkswaterstaat to install a monitoring system to have better insight in the condition and behavior of the hydraulic system.
Condition Based Monitoring
A permanent monitoring system provides continuous insights in the condition and the behavior of the barrier and is used for maintenance and renovation programs.
To gain more insight in the behavior of the hydraulic system an HVR Engineering measurement system was installed on the Maeslantkering in 2007.
The HVR Measurement system monitors the hydraulic system, but also the stresses in the push-pull bar that connects the drive train to the main structure.
All the components are continuously monitored via the system and data is collected and saved on the measurement systems at site. Large sets of data will cover the time when the barrier wall is sitting on the foundation. These periods are important to understand the performance and behavior of the system when idle. At other times the barrier wall is actually in movement, for instance during monthly and annual testing, but also when the barrier wall is floated as a precaution.
Data and Behavioral Analysis
All the sytems that control the movement of the barrier walls are tested every three months, and more extensively once a year during the annual test. All data of these tests is analysed by HVR Engneering.
In order to analyse the large sets of data and to compare measurement data to earlier findings, algorithms were developed. The outcome of every analysis is reported to Rijkswaterstaat and specific advice is given to repair, or to further analyse components that are underperforming or showing irregular performance.
Continuous monitoring and detailed analysis of measurement data has shown that with better understanding and control of the system, the maintenance frequency of the drive system could be extended.
The Maeslantkering was built in the mid 1990s and completed in 1997. During the built and the years after, HVR Engineering has supported Rijkswaterstaat at the barrier wall.
In the past years we have provided assistance during the annual and the high-floating tests. We have supported the team with our knowledge of the hydraulic drive system and have given advice to optimize test procedures.