The first phase of Nanjing Metro Line 9 starts at Hongshan Xincheng Station and ends at Jiangsu Grand Theatre · Constitution Square Station. The line is 19.684 kilometers long, entirely underground, with 16 stations, including 9 transfer stations. The line passes through Xuanwu District, Gulou District, and Jianye District. Once completed and operational, it will be an important local line connecting the central part of Hexi, Xiaguan, and Xinzhuang areas within Nanjing's main city, and is of great significance to the development of Hexi New City and the upgrading and renovation of the Xiaguan area.

The shield machine for the right line of the section from Zhongfu Road Station to Siping Road Square Station on Line 9 was successfully launched.

On April 28, as the shield machine slowly advanced, the shield machine for the right line of the section from Zhongfu Road Station to Siping Road Square Station of the first phase of Nanjing Metro Line 9 was successfully launched, marking that the section has officially entered the shield tunneling stage and taken a solid step toward the established construction goals.

The main line of the section from Zhongfu Road Station to Siping Road Square Station of the first phase of Nanjing Metro Line 9 starts at Zhongfu Road Station and ends at Siping Road Square Station. After leaving Zhongfu Road Station, the section runs westward along Jianning Road, and construction is relatively difficult. To ensure the smooth launch of the shield, Nanjing Metro carefully planned, optimized resource allocation, and conducted multiple thorough analyses and review demonstrations. In the face of complex geological environments, combined with specialized construction experience, it conducted in-depth research on shield machine selection and adjusted according to the construction conditions and geological conditions of the tunneling section, with targeted pre-control of the impact of the geological environment on shield tunneling.

The first bottom slab of Siping Road Square Station on Line 9 was successfully sealed.

On April 29, the first structural bottom slab of Siping Road Square Station was poured, marking that the station has officially entered the main structure construction stage. Siping Road Square Station is located in the northeast quadrant of the intersection of Jianning Road and Daqiao South Road, arranged east-west on the north side of Jianning Road. The station is an underground three-level island station.

Siping Road Square Station is the last station on Line 9 to start construction and is adjacent to the east extension project of the Jianning West Road river-crossing tunnel. Based on the construction characteristics of the station being close to the foundation pit of the river-crossing tunnel, Nanjing Metro coordinated and communicated with multiple parties, determined the best construction plan, and went all out to accelerate the construction progress of the retaining structure, ensuring the safety of both parties' foundation pit excavation during simultaneous construction. Siping Road Square Station is located in the Yangtze River floodplain area with complex geology. Nanjing Metro strictly implemented the deep foundation pit construction plan, increased investment to optimize the process, and successfully completed the sealing of the first bottom slab.

The shield machine for the left line section from Sancha River Station to Longjiang Station on Line 9 was successfully launched.

In the early morning of May 3, the shield machine for the left line of the section from Sancha River Station to Longjiang Station on Line 9 (hereinafter referred to as the "Sanlong section") was successfully launched, marking that the civil engineering work area 1 of TA02 bid has officially entered the construction stage of the Sanlong shield section.

The section tunnel mainly passes through silty clay layers, and the surrounding environment and geological conditions of the line are complex. In the face of many difficulties, Nanjing Metro, together with all participating parties, went deep into the front line, led multiple units to verify the on-site construction conditions, conducted detailed investigations of the as-built drawings of buildings (structures) along the section, optimized the shield section route and construction plan, ensured that the preparations before shield construction were solid and in place, and provided strong technical support for the smooth launch of the shield machine.

The diaphragm wall of the retaining structure at Longjiang Station on Line 9 was successfully closed.

On May 3, the 62nd diaphragm wall at Longjiang Station on Line 9 successfully completed the lifting and pouring of the reinforcement cage. The construction of the retaining structure at Longjiang Station was successfully concluded, marking that all stations on Line 9 have completed the construction of retaining structures and fully entered the stages of main structure construction and installation and decoration construction.

Longjiang Station is located at the intersection of Caochangmen Street and Jiangdong North Road, an important traffic artery. It forms a cross-shaped transfer with the existing Longjiang Station on Line 4 and is an underground three-level island station. The station is located in the soft soil layer of the Yangtze River floodplain, and most of the foundation pit excavation area is silty clay with great formation changes. In response to construction difficulties such as complex surrounding environment and difficult traffic organization, Nanjing Metro led all units to actively coordinate, comprehensively plan, and take multiple measures to formulate feasible plans, ensuring the smooth closure of the diaphragm wall of the retaining structure at Longjiang Station.