Shield of left line of Yantong Park Station - Cuihu Station of Kunming Subway Line 5 starts smoothly

Recently, the shield tunneling of the left section between Yantong Park Station and Cuihu Station of Kunming Metro Line 5 started smoothly, marking the construction of the left section of the tunnel between Yantong Park Station and Cuihu Station of Kunming Metro Line 5 contracted by China Railway 18 Bureau 4 Company.

The left line between Yantong Park Station and Cuihu Station is 1017.64 meters long, with a depth of 20 meters to 52 meters. The tunnel is located in the center of Kunming, with numerous houses and complicated geological conditions within the construction area, and it goes through kunming Zoo, Yantong Temple and other public activity areas. The shield tunneling machine will be constructed from Cuihu station along Huashan West Road, down through many buildings, water supply, drainage, urban lighting and other complex pipelines, to the Yuandong Mountain mine section, which will be received by the mine section in the shaft. A total of 849 rings of pipe pieces will be assembled.

It is understood that the shield tunneling No.1 is 80m long, 500T heavy and 6480mm in diameter. It is specially equipped with heavy cutter, cutter, reinforced shield tail brush and special equipment for secondary reinforcement grouting, aiming at unfavorable geological factors such as many karst caves, high rock strength and water-rich strata in the round-Emerald interval. By enhancing the functionality of the equipment, the adaptability of the shield is greatly improved, which lays a solid foundation for penetrating houses and bad geological sections, and provides a strong guarantee for the construction of high-quality, safe and efficient tunnels.

At the same time, to avoid the construction safety risk, the practice of green environmental protection requirements, the kunming metro line 5 investment company, TieSiYuan total package projects department, China railway iron supervision consulting co., LTD., and the construction units held special technical seminars, on-site observation, scientific analysis, repeatedly research to argue that eventually adopts digital electronic detonator by hole blasting, the vibration and noise of numerical control in a reasonable range, ensure the safety of cultural relics, the zoo normal business. Construction unit to reform the equipment upgrading technology, for the first time in the kunming subway construction adopts double slot milling machine under the deep geological construction method of reducing milling head instability of the construction process, with vertical degree is difficult to guarantee, soil instability, such as risk, speed up the construction progress, ensure the quality of foundation pit retaining structure into a trough, and improve the sensor, improve the sensitivity, increase the sensor fault early warning prompt functions, to ensure the quality of construction and precision engineering.

It is reported that the project of Kunming Metro Line 5 is 29.96km long, with a total of 22 stations, passing through Panlong District, Wuhua District, Xishan District, resort and Guandu District. It is an important part of Kunming rail transit network. After the project is completed and opened to traffic, citizens' travel will be more convenient, and it is of great significance to optimize the urban ecological environment, expand the urban scale, improve the urban quality, drive the economy around the subway line, and help the economic development of Kunming.