At 1:20 AM yesterday, the Tongluo Mountain Tunnel on Phase II of Metro Line 6 was fully connected. A reporter learned from the Municipal Rail Transit Group that the full connection of the tunnel marks a phased victory for Phase II of Line 6 and lays a solid foundation for the trial operation of the Shangxinjie—Chayuan section on schedule.

 

　　Yesterday, technicians inspected the construction quality of the inspection shaft of the “annular cable tunnel.”

　　Longest Mountain Mined Metro Tunnel in China

　　A relevant person in charge of the Municipal Rail Transit Group introduced that the Tongluo Mountain Tunnel is located between Shangxinjie Station and Liujiaping Station, with a total length of 11,266 meters for the twin tubes. The tunnel body ranges from 260 to 640 meters above sea level and passes through complex geological conditions, making the project extremely difficult. It is currently the longest mountain mined metro tunnel in China and one of the key control projects of Phase II of Line 6.

　　As is well known, the Tongluo Mountain Tunnel has large water inflow and passes through complex geology including coal seams, gas, karst development zones, gypsum rock, and fault zones, as well as densely populated urban areas. To avoid disturbing residents, the project adopted the world-advanced composite TBM plus drill-and-blast method for construction, with TBM construction lengths of 2,736 meters each and drill-and-blast sections of 2,897.37 meters each, effectively preventing soil erosion and secondary disasters.

　　Residents of the Chayuan Area and Along the Line to Benefit

　　The person in charge stated that the breakthrough of the tunnel means the Shangxinjie—Chayuan section is expected to enter trial operation as soon as possible. It is understood that the Shangxinjie—Chayuan section of Phase II of Line 6 is about 12.8 kilometers long. After the section opens for trial operation, it will improve travel conditions for residents of the Chayuan area and along the line, and further enhance travel comfort for residents of the Chayuan area.

　　Related

　　Jiefangbei Annular Underground Cable Tunnel to Be Put into Use Next Year

　　Yesterday, a reporter learned from the Urban Power Supply Company of State Grid Chongqing Electric Power Company that the annular cable tunnel built alongside the Jiefangbei underground parking system has basically been connected and is expected to be put into use next year. It is understood that this project will meet the development needs of the Jiefangbei commercial circle for the next 20 years.

　　The Jiefangbei area is a landmark core commercial circle of our city, but the power tunnels in this area are currently severely overloaded. The annular cable tunnel built simultaneously with the Jiefangbei underground parking system can precisely solve these problems. It is understood that the city's first annular cable tunnel is expected to be fully completed by the end of next year. It consists of a 1,296-meter main tunnel and a 1,012-meter branch tunnel, and will be built in 9 sections, each independently forming a local cable passage. Combined with ground cable trenches, it will achieve network communication in local areas and jointly build a high-speed network for power distribution and transmission.

　　“The carrying capacity of the annular tunnel is 10 times that of ordinary cable trenches,” the person in charge said. The Jiefangbei commercial circle is growing by 30,000 to 50,000 kilowatts of electricity capacity each year, and in the next three years, an estimated 160,000 kilowatts of capacity applications are expected to be connected to the grid. The completion of the annular tunnel will meet the electricity demand of the Qixinggang to Chaotianmen area, including Xiaoshizi and Chuqimen in the upper and lower city areas, for the next 20 years.

　　In addition, the Urban Power Supply Company is currently accelerating the construction of three 110KV substations around the commercial circle. By building the annular power tunnel, the substations can be connected through the tunnel, optimizing the power grid structure and reaching international standards.