I. Project Overview

• Project Location: Nigeria
• Project Duration: February 2024 - June 2024
• Industry: Water Conservancy and Hydropower Engineering, Infrastructure Rehabilitation
• Our Role: Core technical service provider, professional dispatching party (cooperative partner)
•  Service Content: Underwater structure assessment, emergency repair scheme design, on-site construction technical guidance, application of special materials

II. Client's Background & Challenges

• Background: In the Kainji Hydropower Station Unit Expansion and Rehabilitation Project, after long-term high-load operation, the underwater part of the spillway of this key hydropower station was found to have structural damage and concrete erosion, which seriously threatened the overall safety of the dam and the stable operation of the power station. The repair window is extremely short, and time is pressing.
• Challenges:
  1. High technical difficulty: Repairs need to be carried out underwater or in humid environments, which have extremely high requirements for repair materials and technical schemes.
  2. Complex environment: The local climate is hot, the on-site conditions are harsh, and it is necessary to ensure that the power station is constructed without shutdown or with minimal shutdown.
  3. Time constraints: Key repair works must be completed before the flood season, resulting in huge project schedule pressure.
  4. Experience requirements: A professional team with rich experience in underwater repair is required to respond quickly.

III. Our Solution

1. Deployment of professional team: Our company immediately established and dispatched a professional team consisting of senior hydraulic structural engineers, material experts, and construction managers to rush to the project site for support. (List of dispatched personnel: Liu Qing, Liu Cuilong, Li Shiming, Li Zhicheng, Luo Yuantao, Lu Xiaolong, Shen Wei, etc.)
2. Advanced technical schemes:
   • Precise survey: The team used advanced underwater camera and survey technology to accurately locate and assess the scope and degree of damage.
   • Customized design: Based on the survey data, our team quickly designed a repair scheme using high-performance underwater non-dispersible concrete (NDC) and special composite mortar. This scheme has the characteristics of rapid hardening, high strength, and erosion resistance, perfectly adapting to the on-site working conditions.
   • Process innovation: An innovative formwork support and pouring process was adopted to ensure the forming quality of the repaired body under complex water flow conditions.
3. On-site technical execution: Our professional team fully led and supervised the construction of key repair processes, solved many on-site sudden technical problems, and ensured the efficient implementation of the scheme.

IV. Delivered Results & Value

• Successful emergency rescue: The underwater repair work in the core area of the spillway was completed with high quality, eliminating major safety hazards and ensuring the dam's safe passage through the flood season.
• Economic benefits: Avoided huge power generation losses that might be caused by long-term shutdown of the power station and ensured the stability of the local power grid.
• Project schedule and quality: The main repair work was completed 10 days ahead of the original plan within the extremely tight schedule, and the repair quality far exceeded the owner's expectations.

• International recognition: The excellent performance of our company's professionals was highly praised by all parties involved in the project. During the project, Mr. Liu Qing (project leader and engineer), the on-site person in charge of our company, accepted a special interview with the international industry media of China Media Group, sharing China's advanced water conservancy repair technology, which greatly enhanced the company's brand influence and popularity in the international infrastructure repair field. (China Media Group interview video)

  
  

V. Conclusion & Outlook

• Technical strength to cope with complex infrastructure emergency repair projects worldwide.
• Resource integration capability to quickly establish and dispatch high-quality expert teams.
• Excellent execution capability to solve "urgent, difficult, dangerous, and heavy" engineering problems in harsh environments.

This successful cooperation has laid a solid foundation for in-depth cooperation between our company and international engineering partners, and also opened up high-end overseas markets for the company in the future.