Recently, the Zhongshan Xihe Pumping Station project, the largest single-unit pumping station in Asia by flow capacity, constructed by Guangdong Hydropower Second Bureau under Guangdong Construction Engineering Holdings Group, was officially put into water supply operation.

The Zhongshan Xihe Pumping Station project is a key construction project of Guangdong Province, a key livelihood construction project of Zhongshan City, and a key water conservancy construction project of Zhongshan City for 2023. As a pumping station project integrating drainage, flood (tide) control, and emergency irrigation and water replenishment functions, it joins the existing Xihe Sluice and Xihe Ship Lock to form the Xihe Water Conservancy Hub, the largest water conservancy hub in Zhongshan City. The core construction content undertaken by Guangdong Hydropower Second Bureau includes building a new levee-type block-foundation pumping station with a drainage flow of 400 cubic meters per second and a temporary emergency water replenishment flow of 145 cubic meters per second, along with supporting facilities such as a power distribution room, control building, trash-cleaning machine bridge, traffic bridge, roads, and landscaping.

During project construction, because of the large excavation depth of the pumping station foundation pit and the high water content of the soft soil foundation, traditional foundation pit water-stop construction techniques could hardly meet the requirements, posing risks of seepage and collapse in the foundation pit. After repeated surveys and experiments, the project team innovatively adopted a construction scheme combining high-pressure jet grouting piles with curtain grouting, and optimized process parameters based on actual project conditions, providing solid technical support for construction safety. To address the difficulty of mass concrete construction for the pumping station base slab, the project team optimized the concrete mix ratio, installed temperature sensors inside the concrete for real-time monitoring, and adopted measures such as layered pouring and enhanced curing, successfully solving the temperature control problem in mass concrete pouring, ensuring the construction quality of mass concrete, and effectively preventing cracks.

The official water supply operation of this project will relieve waterlogging pressure in 13 towns and subdistricts, including the central urban area of Zhongshan City, and play a role in disaster prevention and mitigation. At the same time, it will provide reverse water replenishment to enhance the hydrodynamic force of the Qi River, promoting a virtuous cycle among water conservancy disaster prevention and mitigation, water resource allocation, and the social economy. Next, Guangdong Construction Engineering Holdings Group will continue to leverage the professional advantages of its subsidiary enterprises in water conservancy construction, continue to deepen its presence in water conservancy project construction in the Guangdong-Hong Kong-Macao Greater Bay Area, strengthen technological and management innovation, inject strong momentum into the construction of happy rivers and lakes in Guangdong with professional strength, and make greater contributions to enhancing water security capacity in the Guangdong-Hong Kong-Macao Greater Bay Area.

Source: Guangdong Provincial State-owned Assets Supervision and Administration Commission