Chongqing Rail Transit Line 7 has achieved a significant milestone: the left tunnel boring machine has successfully reached the receiving end in the section between Logistics Park North Station and Logistics Park South Station. This marks the completion of dual-tunnel excavation for this section, making it the first segment of Chongqing Rail Transit Line 7 to achieve dual-tunnel breakthrough. This progress represents a new phase in the construction of this important urban rail transit line connecting key city areas.

The left tunnel of the North-South section spans approximately 1,334 meters, with tunnel depth ranging from 13.9 to 35.2 meters. The tunnel features a circular cross-section design, with a maximum gradient of 20‰ and a minimum turning radius of 450 meters.

To overcome construction challenges including continuous small-radius curve excavation and tunneling underneath existing buildings, the project team established specialized technical groups to develop targeted construction plans. Using real-time tunnel boring machine guidance systems and monitoring systems, the team dynamically adjusted excavation parameters, enhanced settlement monitoring, and optimized grouting processes and pressure control. These measures effectively mitigated construction risks, ensured precise tunnel alignment and segment assembly quality, and achieved zero disruption to existing buildings, municipal roads, and underground pipelines along the route.

Tunnel construction

Upon completion, Rail Transit Line 7 will further enhance Chongqing’s public transportation network, improve travel conditions for residents along the route, and provide crucial transportation support for regional economic development.

Chongqing Rail Transit Line 7

Chongqing Rail Transit Line 7 is a vital metro line in Chongqing, China, which began operations in 2021. It serves as a key east-west corridor, connecting major districts and transportation hubs like Chongqing West Railway Station. The line is notable for its modern design and for improving urban mobility in the mountainous city.

Logistics Park North Station

Logistics Park North Station is a modern freight and logistics hub located in Chongqing, China, designed to enhance regional trade and supply chain efficiency. It was developed as part of China’s Belt and Road Initiative to strengthen rail connections for cargo transport between Asia and Europe. The facility supports the transshipment and distribution of goods, playing a key role in international rail logistics.

Logistics Park South Station

Logistics Park South Station is a major intermodal freight transport hub located in Chongqing, China. It was developed as part of China’s Belt and Road Initiative to strengthen trade links between western China and international markets, particularly in Europe and Southeast Asia. The facility serves as a key terminal for the Chongqing-Xinjiang-Europe railway, facilitating the efficient transfer of goods between trains and other modes of transport.