Record of Installation and Debugging of Flexible Intercepting Wells in Zhoushan, Zhejiang Province

Record of Installation and Debugging of Flexible Intercepting Wells in Zhoushan, Zhejiang Province

The sea breeze from Zhoushan carries a salty smell, and the roar of excavators on the construction site is intertwined with the sound of waves. In October 2025, a new type of flexible diversion well is under construction on the coastline of Lingang Industrial Park in Dinghai District, Zhoushan City. This environmental protection project with a total investment of 230 million yuan adopts elastic materials and intelligent control systems, and will become the first pollution interception facility in the Yangtze River Delta region with tidal adaptive function.

At 6am, project manager Li Weiguo was already standing at the construction site. He held a stack of drawings in his hand and stared at the water level changes in the foundation pit with a furrowed brow. It takes another 20 centimeters to install the bottom plate, but the tide will rise after two hours. Li Weiguo shouted into the walkie talkie. This is a difficult problem encountered in the construction of flexible diversion wells - how to ensure foundation stability under complex geological conditions in intertidal zones. The engineering team urgently dispatched three high-power pumping pumps and used rapid setting concrete for construction, finally completing the pouring of the cushion layer before the tide rose.

Material engineer Zhang Min is testing the tensile properties of elastic sealing membranes in a temporary laboratory. This membrane material made of polymer composite materials is the core component of flexible interception wells, which needs to withstand the deformation caused by tidal changes twice a day. The tensile strength reached 110% of the design value, but the weather resistance test showed that the performance decreased rapidly after UV irradiation. Zhang Min's notebook is densely filled with data. After urgent communication with the German supplier, it has been decided to add a nano protective coating on the surface, which will extend the material's lifespan to over 15 years.

Record of Installation and Debugging of Flexible Intercepting Wells in Zhoushan, Zhejiang ProvinceIn mid November, the installation work entered a critical stage. The main body of the 4-meter diameter interception well adopts segmented assembly technology, and the weight of each curved plate exceeds 5 tons. Mr. Wang, a crane operator, operates a 350 ton crawler crane and carefully places the arc-shaped plate into the predetermined position. 2 centimeters to the left, okay, stop! Surveyor Xiaolin was holding a total station, with fine beads of sweat oozing from his forehead. The assembly error of 12 curved plates must be controlled within 3 millimeters to ensure the effectiveness of the subsequent sealing system. After three days and three nights of continuous work, the main structure was finally assembled seamlessly.

The debugging phase encountered unexpected challenges. On the night of December 5th, a strong cold air suddenly hit Zhoushan, and the wind speed on the sea surface suddenly increased to level 8. The intelligent control system suddenly triggered an alarm, indicating abnormal vibration of the hydraulic gate. Technical Director Chen led his team to rush to the scene in the cold wind and found that it was wave resonance that caused high-frequency shaking of the hydraulic rod. Activate the emergency plan immediately! Chen instructed the operator to switch to manual mode and adjust the gate opening to break the resonance frequency. They held on in an environment of minus 3 degrees Celsius for 18 hours until the storm subsided.

The most exciting moment occurred during the joint trial operation on December 20th. When the tide level rises to the warning line, the sensor automatically triggers the closing command, and the 12 sector gates complete the closure within 90 seconds, forming a complete interception barrier. The director of the sewage treatment plant excitedly said, 'This system can intercept 30000 tons of mixed sewage per hour, and the overflow pollution during the rainy season will be reduced by more than 70%.'. Of particular note is the intelligent monitoring platform, which can analyze data from over 200 monitoring points in real-time and predict equipment wear and tear through artificial intelligence algorithms.

At the completion acceptance ceremony, the director specially praised the construction team for creating the 'Zhoushan Speed' - compressing the originally planned 18 month construction period to 14 months for completion. But even more proud is the technological breakthrough: the project has applied to 7 countries, including a tidal energy assisted driving device and a blockchain based operation and maintenance data storage system. These innovations have reduced operation and maintenance costs by 40%, becoming a model for coastal city sewage interception projects.

Nowadays, this silver grey interception well stands quietly on the coastline, like a loyal guardian guarding the marine ecology. Whenever the tide rises and falls, its flexible structure will rise and fall slightly, demonstrating the harmonious coexistence of human wisdom and natural forces. When Lao Zhou, a fisherman from Zhoushan, passes by in his small boat, he always takes a second look and says, 'Before, the sea was black on rainy days, but now we can finally see schools of fish again.'. This sentence may be a commendation for engineering builders.

As night falls, the outline lights of the interception well automatically light up, outlining a beautiful arc on the pitch black sea surface. On the large screen of the control center, real-time water quality monitoring data is transmitted: COD, ammonia nitrogen, total phosphorus and other indicators have all reached Class I emission standards. Li Weiguo looked at these jumping numbers and remembered the more than 400 days and nights of struggle, his eyes slightly moist. On the journey of ecological civilization construction, this flexible diversion well is not only a project, but also a witness to the progress of China's environmental protection technology