A Gen-Z Operator's Journey Undersea: Precision in TBM Operations

In the depths beneath the seabed near Ningbo, Zhejiang Province, a remarkable engineering feat is underway. The Jintang undersea tunnel, a critical part of the Ningbo-Zhoushan (Yongzhou) Railway, is being brought to life by a towering tunnel boring machine (TBM) that stretches over 100 meters in length and weighs several thousand tons. This project, aimed at creating the longest underwater high-speed railway tunnel globally, poses serious challenges due to the extreme geological conditions of the area. Here, we find Cheng Jie, who, at the young age of 26, has made history as China's first female operator of a super-large-diameter TBM.

Cheng Jie’s journey into this demanding role began with a passion for engineering. Born in 2000, her foray into the world of heavy machinery and construction was not without its challenges. When she steps into the control cabin of the TBM, she transforms from a gentle individual into a commanding force, deftly handling the intricate machinery with calm precision.

The Jintang tunnel is no ordinary construction project. The geological complexity of the area demands near-perfect precision in operations. Cheng finds herself facing rock that is several times harder than conventional concrete, leading to rapid wear and tear on the TBM’s cutting tools. Replacement of these tools is labor-intensive and requires a well-coordinated effort between Cheng and her cutter replacement teams. Adjusting the cutterhead's angle and stabilizing pressure during these delicate operations is part of her everyday responsibilities, skills she has sharpened over countless hours of training.

In operating the TBM’s thrust system, Cheng meticulously monitors real-time data on display screens, ensuring consistent alignment with the intended tunnel path. The success of tunnel extraction hinges on the delicate balance achieved through her control over 20 hydraulic cylinders. Even minor adjustments—one or two millimeters in pressure—can significantly impact the TBM's trajectory. Her statement exemplifies this dedication: “I sit right here, like an unassuming ballast stone, quietly holding my ground and steadily doing the job I'm here to do.”

Cheng Jie’s commitment is echoed by her teammates, including Dong Bing, the chief mechanical engineer for the project, who diligently tracks construction parameters day in and day out. A network of cutter replacement crews works tirelessly, shifting between the living quarters and TBM site to ensure the timely change of tools and maintain operations around the clock.

Moreover, the dedication of seasoned mechanics enhances the efficiency within the team. Workers like Tang Haiwei, with over 27 years of experience, innovate techniques to monitor temperatures in high-heat machinery. Meanwhile, Sun Jingnan ensures the structural integrity of high-speed trains through expert welding, and Zhang Zhonghua’s familiarity with electronic circuits helps maintain robust port operations.

From the colossal TBM to minute circuit boards, every effort counts in this monumental endeavor. While these skilled workers often work behind the scenes, their contributions are indispensable to the machine's functionality and project success. Whether it involves traversing mountain ranges or connecting distant islands through railways, their craftsmanship and relentless determination ensure that every centimeter counts.

Now, with just a few hundred meters left to excavate on the Ningbo side, the dream of a fully functional railway linking the Zhoushan Islands becomes tangible. When the Yongzhou Railway opens, it will signify more than just infrastructure; it will herald a new era of connectivity and advanced transport options for the region. Cheng Jie and her team exemplify a dedicated workforce, driving home the message that remarkable achievements stem from the labor and persistence of many individuals. It is through their efforts that railways cross mountains and bridge seas, emphasizing the critical role of steadfast workers in bringing ambitious projects to fruition.