Installation and commissioning of Ningbo hydraulic rotary weir gate

As an important facility in urban flood control and drainage engineering, the commissioning work of Ningbo hydraulic rotary dam gate directly affects the operational efficiency and flood control safety of the equipment. Recently, the water resources department of Ningbo City conducted systematic debugging of the hydraulic rotary dam gate in a key area to ensure its efficient and stable operation during the flood season. The following provides a detailed explanation from the aspects of debugging background, technical points, implementation process, and future prospects.

Debugging background and equipment overview
Hydraulic rotary weir gate is a flood control equipment that uses hydraulic drive to achieve gate rotation opening and closing. It has the characteristics of flexible opening and closing, good sealing, and strong impact resistance, and is widely used in urban rivers, drainage pump stations, and other scenarios. As a coastal city, Ningbo is prone to frequent typhoons in summer and local heavy rainfall, which can easily lead to waterlogging. Therefore, the reliability of the dam gate is crucial. The rotating weir gate for this debugging is designed and manufactured by a domestic enterprise, using high-strength stainless steel material. The hydraulic system pressure range is set to 10-16MPa, and the opening and closing time is controlled within 3-5 minutes to meet the requirements of rapid response. After installation, the equipment needs to undergo multi-stage debugging such as no-load trial operation, load testing, and linkage control to ensure that all parameters meet the requirements of the "Specification for Manufacturing, Installation, and Acceptance of Water Resources and Hydropower Engineering Gates" (GB/T 14173-2008).

Key technical points for debugging
1. Stability test of hydraulic system
The hydraulic station is the core of the barrier gate drive, and during debugging, it is necessary to focus on checking the oil pump pressure, oil cylinder synchronization, and pipeline sealing. For example, during a test, it was found that the oil pressure fluctuation exceeded the allowable range of ± 0.5MPa. After investigation, it was found that the response of the solenoid valve was delayed. After replacing the high-frequency valve, the problem was solved. At the same time, the cleanliness of the hydraulic oil needs to meet NAS level 8 standards to avoid particles causing valve block jamming.

2. Verification of gate sealing performance
Detect the sealing effect of the contact surface between the dam gate and the door frame through water injection test. The debugging team used a 0.1mm feeler gauge to check the gap, requiring that the local gap should not exceed 0.05mm. In actual testing, it was found that a rubber waterstop was installed off center, and after adjustment, the leakage rate decreased from 3L/min to below 0.5L/min, meeting the design requirements.

3. Automated control joint debugging
The barrier gate is connected to the Ningbo Smart Water Conservancy Platform, and the reliability of the water level sensor, PLC command transmission, and remote emergency stop function needs to be tested. When simulating the scenario of water level surge during flood season, the system can trigger the command to open the dam gate within 30 seconds and transmit real-time opening data through 4G network, with an error controlled within ± 1%.

Debugging process and problem solving
Debugging is divided into three stages:
Single machine testing stage: Manually operate the hydraulic station and observe whether the barrier gate opens and closes smoothly. It was found that the cylinder was not synchronized, causing the door to tilt. By adjusting the flow control valve, the stroke difference between the two cylinders was reduced to less than 2mm.Linkage testing phase: After connecting to the control system, misoperation caused by signal interference occurs. After using shielded cables and installing filters, the communication error rate decreased from 10 ⁻⁴ to 10 ⁻Load testing phase: Simulate a 5-year flood level (3.2 meters of water pressure), with the dam gate in a fully closed state to withstand continuous pressure for 72 hours without structural deformation, and the sealing performance meets the standard.

Experience summary and optimization direction
This debugging has exposed the issue of insufficient durability of some domestic hydraulic components. In the future, we plan to use imported brand key components to extend the maintenance cycle. In addition, intelligent upgrading is the next key step, and plans to introduce AI algorithms to predict the wear trend of dam gates, such as predicting bearing life through vibration sensor data, to achieve preventive maintenance. The Ningbo Water Resources Bureau stated that such debugging experience will form a standardized manual for reference by similar projects in the Yangtze River Delta region.

Social benefits and long-term value
After the barrier gate is put into use, it can increase the regional drainage capacity by 30% and protect residential areas and industrial facilities within a 20 square kilometer radius. According to calculations, its intelligent control system can reduce manual inspection costs by about 500000 yuan per year. With the advancement of the "sponge city" construction in Ningbo, the technological iteration of hydraulic rotary barrier gates will provide more solid support for the city's resilient disaster prevention system.

(Note: The technical parameters and cases in the article are combined with industry standards and publicly available information. Specific data should be based on the actual engineering acceptance report.).

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