en.Wedoany.com Reported - On the morning of May 20, with a crisp launch order officially given, the cutterhead of the "Shanhai No. 3" shield machine slowly began to rotate and steadily advanced, marking the official start of right-line shield tunneling for the section between Jidong Road Station and Donghuan Avenue Station on the Taizhou Urban Railway Line S2. This project is undertaken by the Railway Engineering Company of China Railway Electrification Bureau Group, a subsidiary of China Railway Group Limited.
The total length of the Taizhou Urban Railway Line S2 is 66.57 kilometers. The section between Jidong Road Station and Donghuan Avenue Station, where the launch took place, runs along Shifu Avenue in the main urban area of Taizhou. It has a total length of 2.347 kilometers and needs to pass under multiple municipal pipelines, bridges, rivers, and other important structures, creating a complex and variable construction environment. Even more challenging is that the geology of this section is dominated by soft muddy ground, characterized by high water content, poor bearing capacity, and susceptibility to deformation. Tunneling through this is akin to boring through "mud," placing extremely high demands on controlling tunnel displacement and the deformation and settlement of surrounding buildings (structures) and pipelines. It is known within the industry as a "challenge of tunneling in soft soil."
According to Huangfu Shenzhou, the Party Branch Secretary and Chief Engineer of the Taizhou Urban Railway Line S2 Civil Construction Bid 5 Project from the Railway Engineering Company of China Railway Electrification Bureau Group, to overcome this soft soil tunneling challenge, the Earth Pressure Balance shield machine "Shanhai No. 3" deployed this time has undergone targeted customization and optimization. The shield machine has a total length of 110 meters and a total weight of approximately 1,100 tons, with the heaviest component being the main drive, weighing 125 tons. "In response to the characteristics of the soft soil geology, we specially customized a spoke-type cutterhead with an excavation diameter of 8.83 meters and an opening ratio of about 55%. It is also equipped with 9 foam injection ports and 2 bentonite injection ports for muck conditioning; the main drive uses a 3,000-kilowatt variable frequency electric drive, with a maximum advance rate of up to 80 millimeters per minute, fully and efficiently addressing the challenges of soft soil tunneling," said Huangfu Shenzhou.
Furthermore, the project department established a special leading group for the shield machine launch. Combining the characteristics of the soft soil geology and the complex construction environment, they tailored a detailed launch plan, assigning every task to specific posts and holding individuals accountable. During the construction process, technical personnel were on-site throughout, using intelligent monitoring equipment to capture real-time shield tunneling parameters, tunnel deformation, and changes in the surrounding environment. Through precise data analysis, they promptly adjusted key parameters such as tunneling speed and chamber pressure to ensure construction safety was controllable.
It is understood that once completed, the Taizhou Urban Railway Line S2 will form the backbone network of urban rail transit together with Line S1, serving the central urban area's development strategy of "expanding eastward and westward, connecting southward and crossing northward." This will greatly facilitate citizen travel and drive the coordinated development of industries along the line.
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