More than 20 kilometers east of Tiananmen Square, it is the sub center of Beijing city. The construction of a number of Megaproject and key projects is accelerating, and a "city of the future" that has undergone national strategic deployment and scientific planning is growing. On the morning of July 11th, the reporter drove to the construction site of the East Sixth Ring Road renovation project in Beijing, and took the engineering elevator to slowly descend to a depth of 26 meters underground. The one-way three lane tunnel was eye-catching. Continuing forward for 7.4 kilometers in the tunnel, accompanied by a huge roar, the largest domestically produced shield tunneling machine with a diameter of 16.07 meters, a total length of about 145 meters, and a total weight of about 4500 tons, the "Canal", appeared in front of us. "The whole tunnel has three characteristics of 'long, large and deep'. The longest continuous shield tunneling distance is 4770 meters, which is one of the longest continuous large shield tunneling tunnels in China. The design section diameter of the tunnel is 15.4 meters, which is one of the shield tunnels with the largest section diameter of expressway in China. The deepest burial depth of the tunnel is about 75 meters, passing through Beijing–Harbin railway, sub central hub station, Metro Line 6, Tongsan Railway, etc., which is the deepest high-speed highway in China Road shield tunnel He Jianguang, an engineer for the East Sixth Ring Road project of CCCC Tunnel Bureau, introduced the "three most" of the renovation project. In the interview, Lv Jirui, the technical director of the East Sixth Ring Project of China Communications Tunnel Bureau, revealed good news: With the completion of the 7.4 kilometer advance of the "Canal" cutterhead, the shield machine has successfully arrived at the receiving shaft. This means that the longest shield driven highway tunnel in China is about to achieve dual line connection. The East Sixth Ring Road is equivalent to the central axis of Beijing's urban sub center. Relying on the existing East Sixth Ring Road for land access renovation and widening to two-way six lanes is of great significance for promoting the coordinated development of transportation in the Beijing Tianjin Hebei region. "He Lichao, the head of the East Sixth Ring Road Project Office of the First Construction Company, introduced that after completion, multiple urban roads in the Beijing sub center will achieve east-west connectivity, making transportation and travel more convenient. Adjacent to the reconstruction project of the East Sixth Ring Road of Beijing, the construction site of the Beijing Sub-Center railway station Comprehensive Transportation Hub Project, located on the east bank of the North Canal, is also in full swing. However, many drivers passing by here have a question: for more than three years, there have been numerous tower cranes and hurried traffic here, why haven't tall buildings and bridges been erected? At the construction site, Wu Kejia, senior project manager of the Construction Management Department of the Beijing Sub-Center railway station Integrated Hub Construction Management Co., Ltd., revealed the answer: based on the design concept of "station city integration", the Beijing Sub-Center railway station integrated transport hub under construction has adopted the "cover and excavation reverse operation" process, hidden the integrated transport hub underground, broken the traditional design of railway dividing the city, and realized the Inter-city rail, urban tie line The organic integration of urban rail transit, bus stops, and urban functions. "The underground railway has access to all directions and revitalizes the urban space on the ground. It is the first time in Beijing and even in the country to build such a large-scale urban complex of" station city integration "above the Inter-city rail station." Zhang Dengke, deputy general manager of Beijing Sub-Center railway station Comprehensive Hub Construction Management Co., Ltd., said that with the capping of the core western area of the main station building of the project, this "super project" also ushered in a new construction node. After the completion of the whole project, Beijing Tangshan intercity railway and Capital Airport–Daxing Airport intercity railway will be set up, which can realize Beijing Tianjin Hebei“