Recently, the right-line shield machine for the section from Wenhua Square Station to Gongnong Dalu Station in Work Area 6 of Changchun Rail Transit Line 5, undertaken by China Railway No. 2 Engineering Group, was successfully received, marking the achievement of dual-line breakthrough in the ** section of this work area and a new breakthrough in project construction.

The right line from Wenhua Square Station to Gongnong Dalu Station in Work Area 6 of Changchun Rail Transit Line 5 has a total length of 1,260 meters, with a minimum curve radius of 350 m, a maximum design longitudinal slope of 24‰, and a tunnel burial depth of 17.99 m to 20.85 m. Along the construction alignment, the tunnel passes alongside and beneath numerous buildings (structures), municipal pipelines, existing line entrances/exits and other risk sources, resulting in a complex construction environment.

To complete the construction task safely and efficiently, the project department kept a close watch on the front line, planned ahead, and took precise measures. It prepared various emergency response plans and accurately analyzed the key and difficult points of the project. In response to construction difficulties such as cutter wear, mud cake formation on the cutterhead, segment uplift, small-radius construction, crossing beneath existing line entrance/exit structures, the Xiaonan Lake water body, and the Hongqi Street building complex, detailed construction plans and technical measures were formulated. During construction, the dual control measures of safety and quality were strictly implemented; the leadership shift system and the standing supervision system for key processes were maintained; pre-shift education was carried out; and technical training was strengthened, making shield construction safer and segment assembly more standardized and uniform. By strengthening monitoring and measurement, close attention was paid to settlement changes of the ground and surrounding buildings as well as various parameters of shield machine excavation; the excavation attitude of the shield machine was adjusted and optimized in a timely manner; and synchronous two-component grouting and secondary follow-up grouting systems were configured to ensure the efficiency and quality of shield excavation construction.