On May 14, the shield machine for the right line of the Nanhu Square Station to Huxi Road Station section of the Liugong District of Changchun Rail Transit Line 5, undertaken by Chengtong Company of China Railway No. 2 Engineering Group, successfully launched. This is the third shield machine to be successfully launched for the project, marking that the project has officially entered the "fast lane" of synchronous construction of the dual-shield section.

The right line of the Nanhu Square Station to Huxi Road Station section of the Liugong District of Changchun Rail Transit Line 5 has a total length of 1289.50 m, with a tunnel crown burial depth of 26.2 m to 36.8 m, a minimum section radius of 300 m, and a maximum designed longitudinal slope of 18‰. The geology traversed by the section is a composite stratum dominated by silty clay and weathered mudstone. The shield machine was lowered into the shaft at the large-mileage end of Nanhu Square Station for assembly and launch, and will be dismantled and lifted out at Huxi Road Station. The section runs along the urban area, and the line is mainly laid along major urban arterial roads, with dense pipelines on both sides of the road. Along the way, it passes alongside the Chaoyang District Citizens' Building, the Jeju Island Leisure Club, the Nanhu Mingjia Residential Community, and the residential building of the Press and Publication Bureau, passes beneath Exit No. 5 of Nanhu Square Station of Line 7, and the receiving end of the section contains an overlapping tunnel segment with a total length of 461 meters. In the overlapping segment, the clear distance between the upper and lower tunnels is small, with a minimum spacing of 1.9 m, resulting in extremely high construction risk.

This shield launch had a tight schedule and heavy tasks. To ensure the smooth launch of the shield, the project planned and prepared in advance, organized a special seminar on shield construction, and compiled a series of targeted plans and contingency plans, including a special shield construction plan, a special plan for passing beneath hazard sources, and an emergency response plan. By modifying the shield machine's cutterhead, its wear resistance was increased and its service life extended; by rationally organizing the sequence of processes and actively coordinating the transportation route for the shield machine's entry, the shield machine and supporting equipment were ensured to enter the site as planned. In addition, to safely and efficiently complete the preparations for shield launch, the project reasonably divided responsibilities and assigned them to specific individuals, strengthened training and education for on-site workers, and reinforced workers' awareness of safe construction through measures such as pre-shift briefings and on-site technical disclosures, improving construction efficiency under the premise of ensuring safety. Through the unremitting efforts of all project staff, it took only 1 month to complete various pre-launch preparations such as temporary facility layout, shield machine entry, hoisting and lowering into the shaft, assembly and debugging, track laying, and reaction frame installation, and the shield launch milestone target was successfully achieved.