Compared with the open excavation method, it can shorten the construction period by 4 to 6 months, greatly reduce the on-site construction personnel, reduce the impact of construction on the urban environment, and achieve green and information construction by reducing noise and dust.
Compared with the traditional construction method, the prefabricated station has the advantages of fast construction speed, less climate constraints, high labor productivity, excellent project quality, less construction land, energy conservation and environmental protection.
Sun Junxi, chief engineer of the project management department of China Railway Qingdao Metro Line 6, told reporters that the assembly station scheme of Qingdao Metro Line 6 has been greatly optimized and innovated: first, it is the first time in China to try the full prefabricated assembly technology of assembly for the middle plate, middle longitudinal beam and column of the internal structure; The second is to realize the full prefabrication and assembly under the pile support system for the first time in China; The third is to optimize the structural contour and optimize the structural block, so that the structural stress is more reasonable and the assembly quality and efficiency are higher.
The relevant person in charge introduced that prefabrication and assembly technology is an important means to realize low-carbon construction.
The action plan for prefabricated buildings in the 13th five year plan issued by the Ministry of housing and urban rural development clearly points out that the development of prefabricated buildings is the need to implement the concept of green development, promote the deep integration of construction industry with informatization and industrialization, supply side reform, cultivate new industries and new kinetic energy, and realize the modernization of construction industry.
At the same time, Qingdao metro also independently developed the tooling equipment of “160t intelligent gantry crane + integral separated trolley”, By comprehensively using 3D laser scanning and BIM Technology, the assembly accuracy of prefabricated components is controlled at the millimeter level to achieve accurate design, production and assembly.
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Different from building blocks, the “parts” required for station assembly are produced in the factory in advance with reinforcement and concrete, with a maximum weight of 113 tons.
When they are pulled to the construction site, the workers only need to assemble them one by one on the foundation like “building blocks”, and finally the subway station can be built.
Compared with the traditional construction method, the prefabricated station will produce a number of comprehensive benefits: the construction period of a single station will be saved by 4-6 months, the labor volume will be reduced by 80%, the timber will be saved by 800 cubic meters, and the comprehensive carbon emission will be reduced by about 20%; In addition, it has the advantages of not being affected by the construction environment in winter, reducing on-site construction personnel, improving labor productivity, excellent project quality and reducing traffic interference to urban roads.
“Through all-round assembly and construction technology, the technical problems such as production, turnover and transportation of large non prestressed concrete components (110t) have been solved.” Huang Cheng, chief engineer of Qingdao Metro Line 6 Co., Ltd., introduced.
As the latest form of prefabricated building, the prefabricated subway station concentrates the reinforcement and concrete constructed by the traditional construction method in the factory for flow production.
This technology is not affected by the construction environment in winter, and can reduce the traffic interference to urban roads.
If you imagine the subway station as a set of building blocks, the beams, plates, columns and walls inside are the necessary parts to complete the construction.
The finished components are stored in the factory and transported to the site according to the construction and production needs.
The bottom plate and side wall are hoisted and placed by the gantry crane and fine tuned in place by the roof support device of the trolley; the top plate and middle plate are mainly hoisted to the trolley by the gantry crane, and the trolley is used to adjust the position of prefabricated components, fine tuning of top plate and displacement of middle plate for assembly.” Prefabrication and assembly technology is an important means to realize low-carbon construction.
“Compared with the traditional construction method, the prefabricated station has the advantages of fast construction speed, high labor productivity, excellent project quality, less construction land, energy conservation and environmental protection, conforms to the concept of green and low-carbon development, and represents the future development trend of the industry.” after witnessing the assembly of prefabricated bottom plate components of the first ring, the National Engineering Survey and design masters Yang xiuren, chief engineer of Beijing urban construction design and Development Group Co., Ltd., said that Qingdao Metro took the lead in piloting the application of prefabricated stations in China, which will provide a green island model for the domestic construction industry to practice the goal of “carbon peak and carbon neutralization” and realize industrialization, intelligence and digital transformation.
On October 29, with the 113 ton bottom plate components falling slowly, the assembly construction of keluoshi station of Qingdao Metro Line 6 officially started, marking that the construction of the main structure of the assembled subway station pressed the “acceleration key”.
“Keluoshi station of Qingdao Metro Line 6 is the first fully prefabricated fabricated metro station in China, that is, the main body of the station is prefabricated and assembled, with 2 meters per ring and a total of 8 components, a total of 64 rings and a total of 22720 tons,” said Wang Kaifa, chief engineer of the project.
21 stations are set in phase I of line 6.
The component assembly is like building blocks, and the prefabricated main structure is spliced and formed one by one on the foundation, Make the construction and production of building structures industrialized.
Among them, 14 open cut stations and 6 prefabricated stations.
Among the 6 prefabricated open cut stations, 5 were constructed by China Railway.
Guide ID: the construction of rail urban’s first fully prefabricated subway station in China pressed the “acceleration key”.
“The assembled structure construction of keluoshi station mainly adopts the gantry crane and the separation trolley in the pit for assembly.
