At the bottom of the Qiantang River in Zhejiang, lies a transportation giant connecting Jiaxing, Hangzhou, and Shaoxing—a certain expressway tunnel project. As a key control project across the Qiantang River,it is the first ultra-large diameter shield tunnel in the Hangzhou Qiantang River basin and one of the largest shield tunnels in the world. The tunnelconnects three cities and integrates four major expressway networks, making it a “golden corridor” in the Yangtze River Delta road network.
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Now, the equipment monitoring system (BAS) of this “super tunnel” is undergoing a significant upgrade:the domestic Youwen UW300 series PLC fully replaces the original well-known imported PLC system, achieving a breakthrough in localization from “core” to “system”! A new chapter about safety, intelligence, and autonomous control is quietly beginning at the bottom of the river.
1. Smooth Domestic Replacement for Efficient In-Situ Renovation
The core of this renovation is the successful replacement of the original well-known imported brand withthe domestic Youwen UW300 series PLC, which, based on itsexcellent environmental adaptability, can easily cope with the harsh conditions of high humidity and dust in the riverbed tunnel. The renovation process strictly follows the“in-situ replacement” principle, ensuring three key aspects remain unchanged:
● Physical Space Unchanged: The hardware installation dimensions completely match the original system;
● Network Architecture Unchanged: The topology structure does not need adjustment, reducing wiring complexity;
● Upper Computer Configuration Unchanged: The operation interface and logic do not require reconfiguration, minimizing debugging time.
This move not only achieves autonomous control of the core controller but also significantly improves renovation efficiency with a “smooth transition,” saving costs and time.
2. High Reliability Redundant Design, Upgraded System Stability
The upgraded BAS system adopts a highly reliable dual-redundancy architecture, with core components such as CPU modules, bus expansion modules, power supply modules, and communication networks all achieving dual backup, ensuring that any single point failure does not affect system operation. Additionally, the Ethernet ring network allows for flexible expansion of IO chassis, further enhancing system scalability and reliability.
3. Control Cycle Reduced to Millisecond Level, Significantly Improved Response Speed
The new system achieves a control cycle at the millisecond level, with IO update cycles as fast as microseconds, significantly enhancing the response capability compared to the original system, better meeting the high-speed and precise monitoring needs of tunnel equipment, and providing strong assurance for the safe operation of long-distance and large-span tunnels.
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The most notable core of this project’s successful renovation is that its BAS (Environmental and Equipment Monitoring) system has successfully adopted the “Chinese Heart”—the fully domestic “Youwen UW300 series PLC” as the core control system. This step not only represents a qualitative leap in ensuring the safe operation of the tunnel itself but also breaks the foreign technology monopoly, creating a resounding “Zhejiang Model” for the localization replacement of control systems in long and large tunnels across the country, marking a firm footprint of independent innovation on China’s journey to becoming a strong transportation nation.
