On June 18, the Chongqing Metro Line 6 East Station section project, constructed by PowerChina Railway Construction Co., Ltd., passed completion acceptance, marking that the line has entered the countdown to opening to traffic. The Chongqing Metro Line 6 East Station section (Chongqing East Station–Liujiaping Station) has a total length of 6.79 kilometers, linking 3 newly built stations and 1 renovated station. With "Mountains of Ba, Waters of Yu" as its design theme, it deeply integrates the characteristics of a mountainous city with cutting-edge smart transportation technology, and is the core line connecting to the Chongqing East Station hub.

Management Innovation: Leading the Construction of an Industry Benchmark System

Since the start of the project, PowerChina Railway Construction Co., Ltd., relying on its rich experience and innovative spirit, has led the project team to pioneer a number of firsts in Chongqing rail transit construction. In an archive management innovation, it took the lead in abandoning the archive commitment system and completed archive handover before completion acceptance, achieving a synchronized closed loop between project construction and archive management and providing a standardized model for subsequent projects. It strictly implemented the "three simultaneities" system (simultaneous design, construction, and commissioning). As the first project in Chongqing rail transit to strictly implement the "three simultaneities," it completed special acceptance for environmental restoration and soil and water conservation before acceptance, ensuring that project construction and ecological protection advance in tandem and setting an efficient and standardized benchmark for subsequent projects.

Technological Innovation: Breaking Through Bottlenecks in Key Frontier Technologies

Rooftop Photovoltaic System: A New Practice in Energy Self-Sufficiency.Liujiaping Station was renovated on the basis of the original station. This renovation not only expanded the original platform but also built a distributed photovoltaic power station on the new roof. The distributed photovoltaic power station uses photovoltaic modules to convert solar energy directly into electrical energy. Distributed photovoltaic power stations have been installed at both Liujiaping Station and BaileYuan Station. This "self-generation for self-consumption" model not only ensures the safe and stable operation of the stations' power systems but also promotes efficient energy use.

Continuous Rigid Frame Rotation: A Technological Breakthrough in Crossing Existing Lines.In the section between Liujiaping Station and BaileYuan Station, a 3,500-ton girder was successfully rotated and joined at a maximum angle of 19 degrees, achieving the first successful rotation of a continuous rigid frame crossing an existing rail transit line in the field of Chongqing rail transit. The rotation facility adopted an RPC (Reactive Powder Concrete) steel composite spherical hinge with jointly held intellectual property rights. Compared with traditional steel spherical hinges, it has advantages such as smaller volume, greater stiffness, and smaller rotational torque, greatly improving construction efficiency and safety. It is also the first application of an RPC spherical hinge in the field of Chongqing rail transit engineering, demonstrating the technological breakthrough and innovative strength of the project construction.

Ultra-Shallow Cover Shield Tunneling Technology: Equal Emphasis on Ecological Protection and Engineering Safety.When crossing the Kuxi River Wetland Park, the patented technology "a stable structure for ultra-shallow cover shield tunnels crossing water bodies," designed by Chongqing Rail Transit Design Institute, was adopted. Through designs such as anti-floating piles and rubble concrete backfill layers, it solved the difficulties of tunnel anti-floating and shield tunneling uplift, ensuring the long-term stability of the tunnel beneath the water body and balancing ecological protection with engineering safety. It also made the line alignment in the mountainous city more reasonable in terms of longitudinal slope under terrain elevation differences, improving passenger travel comfort.

After the project is completed, it will greatly strengthen the transportation radiation capacity of Chongqing East Station, realize convenient transfers with Lines 8, 24, 27, and others, build a "station-city integrated" smart transportation hub, strongly promote the development of the eastern trough area, and inject strong momentum into the construction of a "metropolitan area on rails."