On June 9, the reporter learned from China Railway 14th Bureau Group Tunnel Engineering Co., Ltd. that the shield machine for the connecting section between Metro Line 2 and Line 1 has officially begun assembly, and the 73-meter-long shield machine has been delivered to the construction site in batches. It is reported that, unlike the straight-line shield tunneling of ordinary metro tunnels, this connecting dispatch line is an sharp curve with a radius of 200 meters throughout, and the shield equipment must complete a rare underground "sharp turn" in China, making construction highly difficult.

Dananmen Metro Station is the transfer station between Line 2 and Line 1, where passengers can transfer between lines. For metro trains, the connecting dispatch line here can also be used for train scheduling. According to the person in charge of the work area, although this dispatch line is only 148.3 meters long, starting from the west side of Yingze Park, the line is arc-shaped and finally reaches the south side of Yingze Street. However, the horizontal turning radius of this line reaches 200 meters, which means the shield machine, a "big guy," must complete a "sharp turn" underground, which is more difficult than straight-line shield tunneling. This is a test for the shield equipment and also places higher requirements on construction precision.

The excavation diameter of this shield machine is 6.44 meters, consisting of one cutterhead and five trailers. These trailers are responsible for material transport for the cutterhead as well as the supply of electricity, air, and liquid. The shield machine must undergo one month of assembly and debugging before it can officially launch. Unlike conventional integral underground shield tunneling, due to the limited launch site this time, the cutterhead can only enter the ground with one trailer for operation, and the remaining four trailers must "fight in coordination" on the surface, which is also the first time in Taiyuan metro construction.

The shield machine "Jindun No. 1" for the Taiyuan Metro 2-1 connecting section took only three months from equipment selection, return to factory for modification, factory pre-assembly, to on-site assembly. With the strong support and help of Taiyuan Rail Transit Company and other units, the project department actively coordinated and jointly solved various problems in the equipment modification process with China Railway Equipment, ultimately ensuring that the shield machine entered the site for assembly on time.

The project manager stated that they will continue to carry forward the fine traditions and work style of the railway corps—strict obedience, courage to innovate, and indomitable spirit—to lay a solid foundation for fighting again on the "Dragon City" metro and to deliver a satisfactory answer to the people of Taiyuan.