The assembly of 22,196 tons was completed in 5 months, and the assembly of the first open-arch assem

On June 13, with the completion of the reinforcement of the last bolt, the main structure assembly of the first arch-type prefabricated station in the north - Sifang Plant Station of Qingdao Metro Line 15 was successfully completed.

Sifangchang Station is the first can-arch prefabricated station in the north, a two-storey standard station underground, in which the assembly section is composed of 447 prefabricated components, under the guidance and help of Qingdao Municipal Public Works Quality and Safety Supervision Station, China Railway 25th Bureau took more than 5 months to complete the assembly of the can-arch assembly station with a total weight of 22,196 tons.

At the construction site of Sifang Plant Station of Qingdao Metro Line 15, the roof adopts a cavity monoblock open roof structure for the first time, which is shaped like an ancient Chinese "arch bridge", and the "cavity" design, without affecting the design strength, greatly reduces the weight of the roof and the risk of hoisting, and reduces the energy consumption of resources. The outer frame structure is composed of four prefabricated components in the way of "building blocks", which greatly reduces the number of waterproof joints, and adopts the waterproof system of "two pads, one injection and one embedding". Compared with the previous prefabricated station with traditional pile anchor system, the full pile bracing system can better overcome the construction problems such as poor geology of fractured rock and abundant groundwater. At the same time, compared with the previous high-arch prefabricated station with two components assembled from the roof, the large-scale open-arch prefabricated station can reduce the excavation depth of the foundation pit by 1 meter and the number of roof components by 50%, which has the advantages of safer construction process, more economical cost and more efficient assembly speed.

In order to ensure the quality of the subway structure, the prefabricated station has extremely high requirements for the precision of the prefabrication and assembly of components. This requires the "building blocks" to be both good and accurate. Liu Jinhua, chief engineer of Qingdao Metro Line 15 project, said that in terms of scheme research, site planning, process disclosure, progress management, etc., the project uses BIM three-dimensional simulation collision to demonstrate the whole process of assembly construction, find and solve existing problems in advance, and let on-site technicians and workers understand the key points of construction technology more intuitively through process simulation animation, improve the quality of technical disclosure, ensure that the construction and installation accuracy is controlled within 2 mm, and ensure the high-quality construction of fully prefabricated stations. "Compared with the traditional cast-in-place construction method, the prefabricated and prefabricated scheme of Sifang plant and station can save the construction period of 4 months, reduce the number of on-site construction workers by 80%, save 600 square meters of wood, reduce construction waste by 30%, and reduce carbon emissions by 15%, which has a direct contribution to 'carbon peak and carbon neutrality'." Fan Enpeng, project manager of Qingdao Metro Line 15, said that Qingdao Metro Line 15 took more than 5 months to complete the assembly, and realized 75% of the prefabricated assembly of beams, plates, columns and walls of the subway station, which is a concrete embodiment of the national "double carbon" strategy, and an important measure to implement the goal of "building a world-class subway" of Qingdao Metro Group, which is of great significance to the promotion of the same type of prefabricated subway stations in the later stage.

In addition, the project department innovatively uses the "160-ton intelligent gantry crane + tan arch high arch dual-purpose prefabricated assembly trolley" equipment to carry out intelligent assembly construction, through the intelligent gantry crane and the assembly table workshop to set up a unified data interface, to achieve the integrated management and control of the two major equipment, and at the same time rely on the door crane anti-sway system, precise positioning system, intelligent monitoring system BIM animation simulation and other technological innovation measures to ensure the precision control of the assembly operation, improve the safety and stability of the lifting operation, so as to achieve the goal of high efficiency, quality and safety in the assembly process.

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