In a significant advancement for the construction industry, researchers have tackled a pressing issue faced by dual-mode shield tunneling machines—specifically, the Earth Pressure Balance (EPB) and Tunnel Boring Machine (TBM) combination. This innovative study, led by Duan Yueqiang from CCCC First Highway Xiamen Engineering Co., Ltd, delves into the technology designed to prevent or mitigate jamming incidents during hard rock tunneling. The research highlights the critical need for effective unstuck technology, which could have far-reaching implications for project timelines and safety in metro construction.
The study focuses on a real-world application within the Shenzhen Metro Line 8 project, particularly the tunnel connecting Dameisha Station and Xiaomeisha Station. During the tunneling process, the EPB/TBM dual-mode machine encountered jamming due to a combination of factors including excessive wear on cutting tools and improper tunneling parameters. The consequences of such incidents can be severe, leading to extended delays and heightened safety risks on construction sites.
Duan Yueqiang emphasizes the importance of early detection in preventing jamming, stating, “By monitoring key tunneling parameters like sudden drops in speed or torque, we can predict jamming incidents before they escalate.” This proactive approach not only safeguards the machinery but also helps maintain the construction schedule, which is critical in large-scale urban projects where time is often of the essence.
The research outlines a systematic process for addressing jamming incidents, detailing steps such as determining the jamming position, breaking through the rock mass, and conducting in-situ welding of the shield body. These procedures not only facilitate the immediate resolution of jamming but also enhance the operational efficiency of tunneling machines in the long run.
The implications of this research extend beyond just technical improvements; they point to a more reliable and efficient construction process. The ability to minimize downtime and prevent accidents can significantly reduce costs and improve project delivery timelines, making it a game changer for construction firms. As Duan notes, “Implementing these technologies can transform how we approach hard rock tunneling, ensuring projects are completed safely and on schedule.”
Published in ‘Chengshi guidao jiaotong yanjiu’—translated as ‘Urban Transportation Research’—this study serves as a crucial resource for engineers and project managers looking to enhance their tunneling operations. For more information on Duan Yueqiang’s work, visit CCCC First Highway Xiamen Engineering Co., Ltd.
As the construction sector continues to evolve, the insights gained from this research could pave the way for future innovations in tunneling technology, ultimately leading to safer and more efficient urban infrastructure projects worldwide.
