Recently, inside the shield receiving shaft at Xiawangbu Station on Qingdao Metro Line 15, the shield machine broke through the wall, marking the smooth completion of the left line of the shield-driven section from Xiawangbu Station receiving shaft to Fujin Road Station (referred to as the "Xia-Fu section"). This is the ** shield-driven section of Line 15 to be completed.

The Xia-Fu section runs westward along Jinshui Road, with the two sides of the alignment mainly consisting of roads, green belts, and similar features. The site faced difficulties such as a complex ground environment and high settlement control requirements. Since the shield launch, Qingdao Metro and the participating unit Sinohydro Bureau 6 have organized elite technical personnel to take part in construction, implemented refined management, and achieved efficient and stable shield advancement.

The shield machine's launch attitude was constrained by the small radius of the section and the short launch shaft, imposing high requirements on driving attitude control and making construction difficult. Qingdao Metro Second Construction Branch and the project department organized technical personnel to simulate online the deviation of the launch attitude of each ring, calculate the attitude of the next ring, and set up a trial section to continuously adjust and collect driving data. Emergency response measures were also put in place, the control of simultaneous grouting volume and grouting pressure was strengthened, and segment sealing and backfill grouting behind the segments were carried out promptly, ensuring that shield construction passed through the launch section quickly, safely, and reliably. The shield-driven section passes beneath the first-level-risk Dacun River and Dacun Bridge, with a vertical distance of only 4.5 meters between the tunnel crown and the bridge piles. To ensure the structural safety of the bridge and smooth ground traffic, the project consistently implemented the management concept of continuous driving, made advance emergency preparations for the undercrossing, focused on identifying possible adverse risks and countermeasures for the crossing, ensured the shield machine passed quickly through the risk source, and guaranteed the continuity of shield driving.

During construction, Qingdao Metro and the participating unit Sinohydro Bureau 6 adopted a smart safety risk management system and grid-based management measures, adhered to the concept of "safety **", implemented refined grid-based management, and carried out "all-weather, no-blind-spot" monitoring of every high-risk operation in the construction process to ensure construction safety.