Creating two firsts, the "Jiajin Shan" TBM successfully started

Correspondent Hu Lin Yin Hengze

"I announced: 'Jiajinshan Number' TBM." Recently, the National Highway 351 Jiakinshan Tunnel Ping Gua Cave TBM, which was built by the 11th Bureau of China Railway, has successfully launched, marking the first time the domestic ordinary highway has been constructed by TBM method after completion. The Jiakinshan Tunnel of the first long tunnel of ordinary secondary roads will enter the rapid construction stage.

The project starts from Baoxing County, Ya'an City, Sichuan Province, and ends in Xiaojin County, Aba Prefecture, with a total length of 10.07 kilometers. Among them, the Jiajinshan Tunnel is 9.35 kilometers long and the flat guide is 9.364 kilometers. It is a technical standard for the secondary highway. The design speed is 60 kilometers per hour. The maximum buried depth of the tunnel exceeds 1400 meters, and there are major bad geology such as rock explosion, large deformation, gas, high and low temperature, and frozen soil. The construction difficulty is high, the safety risk is high, and the organization is difficult. At the same time, the line also involves three natural protection areas including Giant Panda National Park Reserve. The ecological environment is fragile, and civilized construction and environmental protection are strict. In order to save the construction period, the project uses a flat -guided TBM+main hole drilling method to construct, and the two -way excavation is used in two -way. After the flat guide, 4 operating surfaces are added horizontally to greatly improve the construction speed.

"Jia Jinshan" TBM

In order to overcome the problem, the "tailor -made" TBM of the "tailor -made" TBM is a full -breaking hard rock excavator with a diameter of 7.93 meters, which is equivalent to the height of nearly 3 floors. It is equivalent to the length of 20 buses, a total weight of 1,600 tons, which is equivalent to the total weight of 320 adult elephants. It is a veritable underground "Iron and Steel Dragon". It also configures the rapid slag clearing device, advanced rig, and adjusting arch of the arched device for the characteristics of surrounding rocks. It will greatly shorten the construction time of the tunnel, reduce construction risks, and accelerate the progress of digging, which plays a vital role in the entire project.

Starting site

In order to ensure the successful start of the TBM, the project has established a hard work class, continuing the spirit of the "two roads", drumming up, and racing against time to give full play to the advantages of the enterprise TBM team, fully mobilize management and technical resources, and continuously optimize the construction plan , Strengthen the control of safety details, and smoothly promote TBM lifting, assembly, debugging and other work.

Jiajinshan is the first snowy mountain that has crossed during the Long March period of the Red Army. Building the National Highway 351 Jiajinshan Tunnel is an important part of promoting the spirit of the Long March. After the project is completed and opened to traffic, the Two Jinshan will shorten the mileage by 34 kilometers, which is shortened from the original 1 hour to 10 minutes. For thoroughly eliminating the transportation bottleneck of the Colds Mountain Vietnam, optimizing the regional road network, improving the safety emergency protection capabilities of the channel, driving drive, driving drive It is of great significance to develop the development of advantageous resources, consolidate the results of poverty alleviation, and promote the development of the revitalization of the revolutionary areas.

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