On September 1, the right line of the Xiaoyangjiang Station–Dongqianhu North Station section of the civil engineering works for Ningbo Rail Transit Line 7, Contract TJ7017, undertaken by the company, was successfully holed through, marking the completion of the double-line breakthrough of the tunnel in this section and the successful achievement of another important milestone for the project.

Contract 7017 of Ningbo Metro Line 7 is located in Yinzhou District, Ningbo. The project mainly comprises three shield-driven sections: Yunlong Station–Xiaoyangjiang Station–Dongqianhu North Station, and the running tunnel from Yunlong Station to the entrance/exit line of Xiaying Vehicle Depot, plus one cut-and-cover section of the entrance/exit line and one working shaft behind the station. The Xiaoyangjiang Station–Dongqianhu North Station section holed through this time is the longest section of the project, with the left line about 1,888.91 meters long and the right line about 1,876.16 meters long, at a depth of 9.7 to 29.1 meters. The section has three cross passages in total, with one built-in pump room on each of the up and down lines. The shields for both the left and right lines were launched from Dongqianhu North Station and finally received at Xiaoyangjiang Station.

During tunnel boring in the section, the shield had to successively pass beneath multiple rivers, the existing Metro Line 4 and other risk sources. To ensure safe and controllable shield tunneling, the project strictly implemented the company's safety and quality management requirements and carried out detailed surveys of rivers and structures as well as supplementary geological exploration in the early stage of construction. Monitoring points were densely installed at planned locations in accordance with monitoring specifications; during construction, shield tunneling parameters were continuously optimized, and the quality of simultaneous grouting and secondary grouting was strictly controlled. Before shield reception, the project team repeatedly verified and optimized the reinforcement effect at the receiving end, achieving efficient shield tunneling and smooth reception while ensuring "zero settlement" when passing beneath the existing metro line.