The First Cross-city Rail Transit Line in Southwest China

On May 31, 21 meters underground in Fuhong Square, Ziyang City, Sichuan Province, with the cutter head of the "Tongcheng No.2" shield machine breaking through the ground, the right line of the shield section between Baotai Avenue Station and Fuhong Square Station of Ziyang Line of Rail Transit was smoothly connected, marking the first cross-city rail transit line in Southwest China, Ziyang Line of Rail Transit. It has laid a solid foundation for the initial operation of the line.

The tunnel runs through the site

rail transit Ziyang Line, which connects Chengdu Tianfu International Airport, Tianfu International Airport New Town and Ziyang City. The total length of the line is about 38.7 kilometers, with a total of 7 stations. The construction tasks of the underground section of Ziyang Line of Rail Transit, which

controls the shield machine "threading the needle"

to safely cross several major risk sources

, mainly include four underground stations and four shield sections, with a total length of 10.2 kilometers, and the construction needs to cross moderately weathered mudstone, sandstone and composite strata. It brings problems such as segment floating and stratum disturbance to shield construction. "Compared with the traditional shield, the dual-mode shield machine can flexibly switch between the two modes of earth pressure and muddy water according to the actual situation of site excavation geological strata and risk sources," said Zou Fuqing, the

project manager of Ziyang Line of

Rail Transit. In the process of crossing the Tuojiang River, the safety performance is high and the comprehensive advantages are obvious.

Long distance small radius curve tunneling

makes a "sharp turn" underground & nbsp; In the process of shield tunneling, Ziyang Line of

Rail Transit is faced with the problem of small radius curve tunneling of shield machine. "Especially in the two sections of Ziyang North Station to Baotai Avenue Station and Baotai Avenue Station to Hong Square Station, the 105-meter-long shield machine has to carry out long-distance tunneling construction on the curve with a radius of only 450 meters, which is similar to the" sharp turn "when driving. The difficulty of construction has doubled.

In order to ensure the safe and stable tunneling of shield machine, the Ziyang Line Project Team analyzed the tunneling parameters, segment posture and surface subsidence data of each ring, and carried out real-time three-dimensional visualization, precise grouting of key construction sites, and remote intelligent monitoring of shield operation. Ensure efficient progress.

Underground racing

is the guarantee

for key projects. Five shield machines have been put into synchronous construction in Ziyang Line of Rail Transit, and continuous belt conveyor has been used to discharge slag. The machine has the advantages of long conveying distance, large conveying capacity, low noise and convenient maintenance, with a maximum monthly footage of 460 meters. In the

next step, the construction team will continue to promote the safe and orderly development of Ziyang Rail Transit Line, and contribute to the construction of Chengdu-Chongqing Shuangcheng Economic Circle and the development of Chengdu-Deyang-Meizi City.