Recently, the Haicheng Station of the Shenzhen Metro Line 15 project, a composite assembled station constructed by Sinohydro Bureau 4 Co., Ltd., was successfully capped. The smooth completion of this milestone marks the successful completion of construction tasks for Shenzhen Metro's first composite assembled station.

Haicheng Station of Shenzhen Metro Line 15 is located south of the intersection of Haicheng Road and Xingye Road. The station's main structure adopts a two-story underground single-column double-span structure and is constructed using the "cast-in-place method + composite assembled construction method." The station is 209.2 meters long, of which the assembled section is 123 meters long and requires the installation of 401 precast components in total, covering various types such as walls, slabs, columns, and beams. It is Shenzhen Metro's first important practice in the application of assembled construction technology.

As Shenzhen Metro's first composite assembled station, Haicheng Station undertakes many tests and tasks. First, the precast components are "numerous, large, and heavy"—they cover more than ten types, with the largest weighing up to 41.8 tons, and the entire process of production, transportation, and hoisting requires precise control, as deviations can easily affect progress and safety. Second, the structural node connections are complex, and stability depends on connection quality; the nodes involve multiple force forms, construction errors must be controlled at the millimeter level, and there are enormous challenges to assembly precision and node connection reliability. Third, regarding the component assembly process, the selection and design of assembly equipment pose major challenges.

To improve the quality and efficiency of precast component assembly, the project team made coordinated efforts in three aspects: technology empowerment, team support, and equipment innovation. First, BIM + 3D scanning assisted assembly technology enabled intelligent pre-assembly of precast components, identifying and avoiding component assembly collision risks in advance and providing precise technical guidance for on-site construction. Second, an assembly task force for the composite assembled station and a team of self-owned industrial workers were established simultaneously, laying a solid personnel foundation for high-standard project advancement. Third, the company independently developed a combined equipment set of "multi-functional assembly trolley + multi-functional gantry crane," achieving the "four highs" implementation effect of "high component positioning precision, high construction efficiency, high safety assurance, and high level of mechanization application," significantly enhancing the construction quality and efficiency of the assembled station.

The construction of Haicheng Station, the first composite assembled station, is not only a vivid practice of the green and low-carbon construction concept but also a vivid footnote of "Shenzhen efficiency" in the infrastructure field. The on-site "building-block" style assembly greatly reduces dust and noise pollution, truly achieving "construction without disturbing residents and more environmentally friendly building." During construction, the project team applied refined management throughout the entire construction process, laying a solid foundation for project quality with strict standards. Through the mechanism of "daily plans assigned to individuals, daily handover coordination, and daily inspection and hazard elimination," they strictly controlled process linkage and safety risks and successfully completed the construction milestone targets.

Shenzhen Metro Line 15 is an important rail transit line in western Shenzhen, connecting multiple core areas of Bao'an District. After the line is completed, it will improve the rail transit network of Bao'an District, achieve efficient connections with buses and the road network, further shorten commuting time for Bao'an residents, ease traffic pressure on Haicheng Road and Xingye Road, and improve regional travel efficiency.