"Fighting out" subway station!Changchun Rail Transit Line 7 Jida Fourth Court Station assembled

More than 40 workers, for 4 months of effective construction period, after the construction of prefabricated components of the "building blocks" type, a subway station was "gorgeous". On July 1, the first prefabricated subway station of China Railway Twenty -two Bureau Group Co., Ltd., Changchun Rail Transit Line 7, was assembled, and the construction progress ranked first in the assembly station on the entire line.

Jida Fourth Court Station is one of the three prefabricated stations across the board. It is the second -floor island -style station underground. The total length of 204 meters is located at both ends of the station, with a total length of 60 meters. The prefabricated assembly section is located in the middle of the station. The assembly component has a total of 72 ring 504 yuan, the heaviest top board component length exceeds 10 meters, weighs 54 tons, and the assembly weighs 18,000 tons.

Overcoming construction technology is a new type of construction method. It divides the main structure of the station into 7 concrete prefabricated components such as the bottom plate, side wall, and top plate. The components are strived into an arched structure in order. Different from conventional rectangular stations, arched stations are more in line with underground stress structure, and can bring an open field of open vision with no column. According to statistics, the construction method effectively saves 4 months of working period and reduces more than 80 on -site operators. During the construction period, there are no longer steel bars and concrete dampness operations at the site, which not only reduces the amount of steel and wood, but also the restrictions on the construction of the live concrete construction at low temperature in winter, which also greatly reduces the pollution of construction noise and dust to the urban environment, which will help help. The phenomenon of bidding farewell to the traditional "dirty mess" is more in line with the concept of green and low -carbon development.

The "big building blocks" standing steadily and completing a solid is a key link to ensure the quality of the project. According to Liu Lijun, the chief engineer of the project, they set up 5 1.2 meters wide cement strips along the foundation pit of the station as a support point for the landing of the component, and controlled the flatness of the large -scale assembly through the surface flatness of the strip. During the construction process, the technician used the embedded angle steel to strictly control the surface height of the cement strip with the error of the surface of the band in 1 mm. The concrete base surface filled between the strips was lower than the cement strip noodles for 10 mm. Putting the space to reserve space. Subsequently inject the modified epoxy resin slurry into the gap of the mortise groove to ensure that the component is adhered to a whole.

The project department also led the establishment of a scientific research research group to invite authoritative experts in the industry to demonstrate and guide, scientifically organize the establishment of construction plans, and "tailor -made" "80 The tons of smart dragon door crane+overall separation platform car "work equipment to ensure that the assembly error is controlled within 5 mm, effectively avoiding problems such as the design requirements of the assembly, the flatness of the smooth cushion, the level of the prefabricated block, etc. It overcome the prefabricated construction problems of the first pile support system station, and realized the transformation from traditional "construction" to mechanized "smart manufacturing".

Changchun Rail Transit Line 7 from the south of the Automobile Park Station, to Donghuan City Road Station in the north, with a total length of 23.16 kilometers. There are 19 stations. After the line is completed, the connection between the auto -opening area of ​​the southwest and the central urban area will be strengthened, the traffic congestion of Dongfeng Street, Nanhu Road, Donghuan City Road, etc., and promotes the reasonable development of the Changchun city pattern.

Author: Jilin Daily All Media Reporter Zhao Guangxin

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