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 China's first large-scale hydraulic concrete lining trolley, featuring a high technical level and designed for large-section construction, as well as 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 underwater tunnel ramp in the world. Designed as a two-way six-lane road, the project cost over 2 billion RMB. The tunnel excavation was carried out using the advanced CRD method, which is known for its complexity and high technological requirements. To ensure both construction safety and project quality while accelerating the schedule, the China Railway 18th Bureau Group invested heavily in acquiring this cutting-edge concrete lining equipment.
The trolley measures 10 meters in length, 13.5 meters in width, and 8.35 meters in height. It is constructed with high-toughness steel plates, a strong steel frame, and an efficient hydraulic power system. The entire structure functions as a single steel formwork, equipped with automatic hydraulic cylinder demolding technology. During construction, it is supported by screw jacks, and self-propelled movement is achieved through electric reducers. All concrete is transported and filled via pumping systems.
One of the most remarkable features of this equipment is its highly efficient concrete pumping piping system. As the concrete enters the main pipeline, the system automatically distributes it evenly on both sides of the trolley. The thickness of the poured concrete fully meets the required construction standards. Its two-way adjustment capability ensures precise transitions between straight and curved sections, maintaining the shape of the tunnel walls and arches, resulting in smooth, aesthetically pleasing lining.
After multiple construction cycles, this trolley demonstrated its advanced performance in operations such as walking, lifting, formwork installation, disassembly, and concrete pouring. It significantly reduced labor and time costs, minimized material waste, and ensured the safety, quality, and progress of the project. Each concrete pouring cycle was shortened by 30 hours, and overall construction efficiency increased by six times. This innovation holds great significance for future ramp construction in highways, railways, and municipal projects, and has broad potential for widespread application.
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