[Explanation] Beijing's Third Ring Road, which carries millions of people every day, is constantly flowing with people and vehicles.
The Spring Festival is approaching, and right below the North Third Ring Road, machines are roaring and sparks are flying. This is the construction site of Metro Line 12.
[Same period] Lang Yao, design director of Beijing Metro Line 12, Railway Fifth Institute
Now we are at this position, which is about 34 meters (deep) below the North Third Ring Road. It is our Jimen Bridge Station. Extension line for transfer.
[Explanation] The total length of Beijing Metro Line 12 is about 29 kilometers. It is a rail transit line mainly laid along the east-west direction of the North Third Ring Road. Among the 20 stations designed for the entire line, there are 15 interchange stations.
Lang Yao, designer of the Fifth Railway Academy, is responsible for the design of four stations and five sections of Line 12.
"Extremely high risk and extremely difficult", this is Lang Yao's evaluation of the project.
[Same period] Lang Yao, design director of Beijing Metro Line 12, Railway Fifth Institute
Because it mainly passes through the existing subway line, and passes through bridges such as Suzhou Bridge, Sitong Bridge, Lenovo Bridge, Jimen Bridge, and North Taipingzhuang Bridge. The settlement requirements of these bridges are generally 10 mm to 15 mm. Within, the North Third Ring Road also requires 10 mm.
[Explanation] Underpassing the Beijing-Zhangjiakou Railway is the most difficult project with the highest safety risk on the entire line. The distance between the top of the subway tunnel and the high-speed rail is only 1.6 meters, and the settlement must be controlled within 2 mm. The first construction case of high-speed rail.
Lang Yao introduced that repeated testing, evaluation, optimization, and demonstration are required during construction to ensure safety.
[Same period] Lang Yao, design director of Beijing Metro Line 12, Railway Fifth Institute
We are now 365 days as long as the construction is in progress, our design must also follow up.
When the on-site construction personnel encounter some emergencies, such as some water gushing, sand gushing, or some excessive settlement, and according to the monitoring of such abnormal conditions, they must give timely feedback to the designer, and then the designer will promptly respond to the situation. Take optimization measures or strengthen measures to ensure safe construction.
[Explanation] In order not to affect the normal road traffic in the city, most of Line 12 adopts the underground excavation method. When encountering sewage, rainwater, upper and lower water, heat, electricity, high-pressure gas and other pipelines, underground excavation can be better controlled. risk.
[Same period] Li Gang, technician of Beijing Urban Construction Rail Transit Construction Engineering Co., Ltd.
Because its stratum changes a lot, the risk during the excavation process is high, and when encountering pebble layers and water layers, the risk is high. Every day we have a construction foreman, and these (control) quality sites go to the side The station, (responsible for) safety, all need to stand beside the work surface, and watch them in real time to see if there is any problem, find out in time, and avoid any risky work.
[Explanation] Li Gang introduced that on-site underground excavation method construction, the daily progress is only about 1 meter. In order to ensure the safety and progress of the project, nearly 200 people stick to their jobs at the construction site during the Spring Festival.
[Same period] Li Gang, technician of Beijing Urban Construction Rail Transit Construction Engineering Co., Ltd.
Now there are more than 160 workers organized, and more than 20 project managers, who will stay here during the Chinese New Year.
Organize these people to work 24 hours a day during the Spring Festival to ensure the quality and construction period of Line 12 and ensure its opening to traffic.
Because the construction unit just cannot guarantee that you can go home every holiday and Spring Festival.
Now that the duty has been arranged, let it do the job well in a down-to-earth manner.
[Same period] Lang Yao, design director of Beijing Metro Line 12, Railway Fifth Institute
People in every industry and every profession will do their own related work well. We are ordinary people, so we will do ordinary things.
The workload is great, but the achievements are full.
[Explanation] For the upcoming Chinese New Year, they made their wishes.
[Same period] Lang Yao, design director of Beijing Metro Line 12, Railway Fifth Institute
We started the design work (Line 12) in 2014, and it has been 9 years until 2023. It is a hard work, and I hope it can be opened smoothly.
[Same period] Li Gang, technician of Beijing Urban Construction Rail Transit Construction Engineering Co., Ltd.
My New Year's wish is to spend more time with my family, wife and children at home after the successful completion of Line 12.
Reporter asked Baokui to report from Beijing
Responsible editor: [Li Ji]