On July 19, as the slurry shield machine in the under-construction shield-driven section of Shenyang Metro Line 6 accurately reached the designated receiving position, the right line of the Sanhao Bridge Station–Nandi West Road Station section of Line 6 Bid Section 13, constructed by Shenyang Municipal Group Co., Ltd., was successfully completed.

The Sanhao Bridge Station–Nandi West Road Station section has a total length of approximately 1,613.519 meters. The shield machine was launched from Nandi West Road Station, running in an "S" shape beneath the Hun River, passing through Shenshuiwan Park and via Sanhao Street, before finally arriving at Sanhao Bridge Station.

During shield construction, in addition to routine risk source control, the greatest risk source for this section was the under-crossing of the Hun River. The construction length of the under-river crossing is 816.383 meters, running in an "S" shape beneath the Hun River, with a horizontal curve radius of 410–435 meters. The vertical distance from the section crown to the Hun River bed is 12–20 meters, the maximum scour variation of the river embankment is 5–7 meters, and the section tunnel is 6.6–11.8 meters from the maximum scour variation line of the Hun River. During the Hun River crossing construction, it was the wet season of the Hun River channel, with relatively large channel flow, which had a significant impact on the pressure of the soil layer above the shield machine. In addition, the Hun River bed contains various soil types such as highly cohesive soft soil, clay, sandy soil, and gravelly soil, imposing extremely high requirements on the control of shield construction parameters and entailing high construction risks.

As the slurry shield machine used in the shield-driven section of Metro Line 6, Shenyang Metro Group and the Shenyang Municipal project department carried out scientific planning. On the basis of referring to the construction control measures for other lines crossing the Hun River, and in combination with their own section's geological conditions and line characteristics, they held multiple expert review meetings, continuously optimized the construction scheme and process control measures, and relied on refined control technology for shield tunneling risks to continuously establish and improve the risk control system, ensuring that construction organization and on-site construction management were carried out in a solid and detailed manner. By strengthening research on cutter configuration, optimizing cutter selection, innovating the mud film preparation process, optimizing grouting materials and processes, and refining the linked management of chamber opening, and by dynamically adjusting tunneling parameters in combination with geological information, disturbance to the strata during construction was greatly reduced, the risk of riverbed settlement was lowered, water inrush accidents were effectively avoided, and the project achieved "zero impact" and "zero accidents." Ultimately, the safe crossing of the Hun River was successfully completed, accumulating valuable experience for slurry shield construction.