Recently, the section from Zhongxin Avenue Station to Dongliudao Station in Bid Section 02 of Tianjin Rail Transit Line Z2, built by China Railway Binhai (Tianjin) Rail Transit Investment Development Co., Ltd. and constructed by China Railway No. 4 Engineering Group, has seen new progress: the right-line shield machine was successfully received, marking the full breakthrough of both lines in this section.

The section from Zhongxin Avenue Station to Dongliudao Station starts from the east end of Zhongxin Avenue Station and is received at Dongliudao Station, with a total length of 2.17 kilometers. The shield machine successively passed alongside important buildings such as the Crowne Plaza Hotel, the Airport Sports Center, and the Airport Cultural Center, and passed underneath the Yuanjia River before arriving at the receiving shaft at Dongliudao Station. The geological conditions along the route are relatively complex, requiring traversal of various strata including silty clay and silty sand layers, with complicated construction procedures, high difficulty, and high risk. In particular, during the period when the shield machine passed underneath the Yuanjia River area, this area is located at a variable stratum transition zone; when the shield machine and segment lining pass through this stratum, they often face the difficulty of controlling the shield machine's attitude and segment formation quality due to uneven forces.

To ensure the shield machine could advance and be received smoothly, the project department established a special shield receiving team and organized more than 10 seminars and expert consultation meetings. Through research and analysis of construction advancement conditions and tunneling parameters, measures such as adding counterweights, adjusting the center of gravity of the shield machine, changing the grouting method and grouting volume, and thickening the segment gap to reduce segment misalignment and damage were adopted to ensure smooth shield tunneling. Second, in conjunction with the supervision unit, strict inspections were carried out on equipment that had passed acceptance, a rigorous functional system maintenance plan was formulated, regular repair and maintenance of equipment were implemented, and equipment operation was assigned to specific personnel and posts, with equipment operating procedures issued to prevent operational damage. At the same time, through management measures such as on-site safety briefings and training, daily pre-shift talks, daily coordination meetings, and emergency drills, the safety production awareness of on-site workers was strengthened, and the 24-hour leadership duty system was strictly implemented to enhance process monitoring and comprehensively monitor tunneling dynamics, ensuring the safe, stable, and orderly advancement and smooth reception of the shield machine.