The professional technicians from China Railway 18th Bureau Group have successfully installed and commissioned a state-of-the-art system. This marks the debut of the first large-scale hydraulic concrete lining trolley in China, featuring a large cross-section, high technical performance, and the country's first large-scale submarine ramp. The Xiang'an Submarine Road in Xiamen City has now officially opened to the public.
Spanning a total length of 5.9 kilometers, the Xiang'an Submarine Ramp is currently the largest submarine ramp in the world. Designed as a two-way six-lane highway, the project cost over 2 billion RMB. To ensure construction safety, quality, and efficiency, the China Railway 18th Bureau Group invested heavily in advanced technology. They procured a high-performance, large-scale hydraulic concrete lining trolley specifically for this challenging project.
The trolley measures 10 meters in length, 13.5 meters in width, and 8.35 meters in height. It is constructed using high-toughness steel plates, reinforced steel brackets, and a powerful hydraulic system. The equipment is designed as an integral steel formwork structure, incorporating hydraulic cylinder automatic demoulding technology. During construction, it is supported by screw jacks, and its self-propelled movement is powered by electric reducers. All concrete is transported and poured through a pumping system.
One of the most remarkable features of this trolley is its efficient concrete pumping piping system. When the concrete enters the main pipeline, the system automatically distributes it evenly on both sides of the trolley. The resulting concrete thickness meets all required construction standards. Its dual adjustment function allows precise transitions between straight and curved sections, ensuring the shape and smoothness of the tunnel walls and arches, resulting in a visually pleasing and structurally sound finish.
After several construction cycles, the trolley demonstrated its full potential. From walking, lifting, installing, disassembling formwork, to pouring concrete, it significantly reduced labor, time, and material costs while improving safety and quality. Each concrete pouring cycle was shortened by 30 hours, and construction efficiency increased by six times. This advancement holds great significance for future ramp construction projects in highways, railways, and urban infrastructure, with broad potential for widespread application and promotion.
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