en.Wedoany.com Reported - The first steel-lined, welded and lined integrated trolley for the Datang Zhongning compressed air energy storage project officially rolled off the production line on June 5.

This project is a key national technology research initiative for green and low-carbon energy transition and development, and is also China's first hundred-megawatt-level compressed air energy storage project using artificially excavated underground storage caverns in soft rock. Construction is based on soft rock conditions, using thin steel plates as the sealing inner mold, requiring simultaneous steel plate assembly, welding, and secondary lining concrete pouring. This demands extremely high multi-objective balance and millimeter-level precision control for the trolley, which conventional tunnel lining trolleys cannot meet.

To overcome technical challenges, the Datang Ningxia Branch and Zhongning Company, in collaboration with China Railway First Group and other units, formed a research and development team. After eight months of effort, the first curved lining trolley completed factory trial production, with trial operation meeting expectations. The independent intellectual property invention patents formed by this trolley constitute core technology that can be extended to small-radius curved and large circular cross-section tunnel projects. As planned, the upper bench of the main cavern is expected to be completed by July 30, 2026, after which assembly of the curved section trolley inside the cavern will commence, and straight section trolleys will also be delivered successively to ensure the project progresses on schedule.

This integrated trolley incorporates steel structure lining, automatic assembly, and efficient welding functions, improving construction efficiency and structural quality, solving complex technical challenges and schedule pressures in project construction, and becoming a key piece of equipment for the project. Its application has achieved independent innovation in China from process equipment to construction technology in the field of underground cavern energy storage engineering, providing a replicable and scalable technical paradigm for underground energy storage projects under similar complex geological conditions.

Leveraging this equipment, the project will strengthen whole-process safety production management while ensuring intrinsic safety, scientifically coordinate resource allocation, steadily advance construction tasks, build a national demonstration project for new energy storage, promote optimization of the energy structure, and contribute to achieving the dual carbon goals.

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