On January 25, the right-line shield tunnel of the Yongyi Road Station–Beicheng Bridge Station section of the 04 bid section of the Nantong Rail Transit Line 2 project was bored through, marking the completion of both shield tunnels of the Yongyi Road Station–Beicheng Bridge Station section, as well as the full boring-through of all four shield tunnels of the project, thus successfully completing all shield tunnel construction tasks.

The Yongyi Road Station–Beicheng Bridge Station section has a total length of 542.5 meters. Beicheng Bridge Station, a three-level underground station, serves as the receiving end of this shield drive and adopts a steel sleeve for auxiliary reception. This end is adjacent to the Jianghai Avenue elevated expressway, which carries heavy traffic and has a complex surrounding environment. In addition, the Nantong area features water-rich sand layers that are prone to water and sand inrush, posing relatively high construction safety risks.

To ensure smooth shield boring-through, the project department planned precisely and organized scientifically. First, with the side wall and roof slab of the negative first floor of the north end shaft not yet constructed, the freezing team was organized to enter the site in advance for cross-operation construction, so that the receiving end was quickly frozen and reached the reception conditions. Second, shield experts, the construction unit, the supervision unit and other parties were organized multiple times to conduct risk assessments and technical scheme demonstrations for shield tunneling, forming a scientific and effective construction scheme and construction organization plan that effectively guided the project's shield tunneling. Third, a 24-hour leadership duty system was implemented, with duty leaders stationed at the front line to command scientifically, make prompt decisions, and solve problems in a timely and efficient manner. At the same time, close attention was paid to the shield tunneling posture, parameters were adjusted, and monitoring and measurement control was strengthened. Fourth, emergency material reserves and equipment mobilization were prepared in advance to provide solid guarantees for shield reception. Fifth, emergency drills for tunnel water and sand inrush were carried out to improve the emergency response mechanism and disposal methods for sudden dangerous situations and effectively enhance the ability to respond to emergencies.