There are 21 underground stations, 6 of which are precast stations.

The prefabrication plant adopts the comprehensive use of three-dimensional laser scanning technology and BIM Technology to quickly obtain the three-dimensional coordinates and texture and other information of component surface points.

The turnover materials such as formwork and scaffold are no longer used on the construction site, which avoids the cutting and welding operation on the site, and makes the subway station construction site completely bid farewell to the traditional image of dirty, messy and poor.

01 scientific and technological innovation promotes iterative upgrading.

More than ten mainstream media at the central, provincial and municipal levels, such as CCTV, Xinhua news agency and people’s network, witnessed this important moment.

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The station components are centrally produced in the prefabrication plant, and then the precast components are assembled one by one like “building blocks” on the construction site.

The precast subway station is a new type of precast building.

Compared with the traditional process, all components of the fully precast subway station are produced and processed in a special prefabrication plant, which is not limited by the site, climate, materials and other conditions on the construction site, and can be precast simultaneously in the foundation pit excavation stage.

After the assembly conditions are available on site, the components can be hoisted and assembled by the intelligent gantry crane.

The workers only need to guide and connect the components in place, and the traditional “formwork plastering, covering and maintenance” is no longer required.

03 low carbon construction helps the “double carbon” target.

In order to ensure the quality of subway structure, precast stations require very high prefabrication and assembly accuracy of components.

The heaviest base plate component is more than 20 meters long and weighs 113 tons.

02 improve quality and efficiency, and assemble efficiently on site.

▲ the roof fine adjustment operation has good construction conditions in the prefabrication plant, and the workers have a high degree of specialization, which can effectively improve the structural construction quality.

▲ the precast sidewalk Qingdao Metro Line 6 innovatively designed the flow production and steam maintenance process of precast components, so that the precast components can be transported through automatic flow operation and roller table, and the technology of mold follow-up, fixed station and oil cylinder jacking transmission is adopted to make the plant design, logistics moving line and flow production line planning and layout of large precast components reasonable, so as to realize the automatic, information-based and intelligent production of precast components.

Use BIM three-dimensional simulation collision to demonstrate the whole process of assembly construction, find and solve existing problems in advance, and make on-site technicians and workers more intuitively understand the key points of construction technology through process simulation animation, improve the quality of technical disclosure, ensure that the accuracy of construction and installation is controlled within 2mm, and ensure the high-quality construction of fully precast station.

The safety risk is effectively reduced, the operation time on the assembly site is reduced by about 70%, and the construction period is saved by 4-6 months.

Qingdao Metro Line 6 has adopted prefabrication and assembly technology in more than 10 aspects, such as enclosure, access road, plank house, box culvert, power pipe, segment and so on..

▲ schematic diagram of keluoshi station up to now, the earth and rock excavation of the main body of the stations along the whole line of Qingdao Metro Line 6 phase I project has been completed, 5 stations have been capped, and 7 single track sections have been connected.

▲ bottom component hoisting in addition, the project management department has also customized a complete set of construction equipment for the precast station, and independently developed a complete set of tooling equipment such as “160 ton intelligent gantry crane + integral separated trolley” with multiple intelligent functions such as rotation, accurate automatic positioning, anti swing, attitude fine adjustment and deviation correction, which has solved the problems of prefabrication, turnover and hoisting of large components, It effectively ensures the assembly accuracy of components and the hoisting safety of large components.

Keluoshi station is a two-story underground station, with a total of 512 assembled components and a total assembly weight of 23000 tons.

On the morning of April 27, with the fastening of the last bolt, the assembly of the main structure of keluoshi station of Qingdao Metro Line 6, the country’s first fully precast subway station, was successfully completed, marking important progress in the construction of line 6.

▲ when the constructors install the last bolt, compared with the traditional cast-in-situ station construction method, a standard fully precast station can reduce labor by 80%, save about 800 tons of steel and 800 cubic meters of wood, reduce construction waste by 60% and reduce carbon emission by 20%.

Up to now, through technical research and development, the project management department of China Railway Qingdao Metro Line 6 has obtained 18 patents for various types of precast station construction, formed a complete set of precast station prefabrication and assembly technology with independent intellectual property rights, and accelerated the transformation of subway construction from labor-intensive industry to green and technology intensive industry.

Qingdao Metro Line 6 is located in the West Coast new area of Qingdao, with a total length of 30.8km.

BIM forward design, three-dimensional modeling, construction animation simulation and other technical means are widely used in scheme research, site planning, process disclosure, schedule management and other aspects.

It is the first all-round assembled subway station in China.

▲ after the precast station components entered the site, the project management department of China Railway Qingdao Metro Line 6 set up a special scientific research team to comprehensively carry out innovation and optimization, realize the full prefabrication and prefabrication of beams, plates, columns and walls, successfully overcome the difficulties such as narrow subway construction site, high waterproof requirements of underground structures and large load on the top of the station, form a complete set of construction technical standards, and lay a foundation for the prefabrication and assembly of subsequent stations.

At the construction site of koloshi station, the most prominent are the precast components of the station with super large volume and weight.

Through cloud computing processing, the solid three-dimensional model is quickly constructed and compared with the design model to ensure the production, processing and assembly quality of precast components.