TBM Tail Sealing Brush Technology Supports Ultra-Large Diameter Shield Tunneling Projects with Reliable Sealing Performance

The successful breakthrough of the Jiangyin-Jingjiang Yangtze River Tunnel has once again highlighted the importance of advanced shield machine components in large-scale underground engineering. As one of the largest diameter and highest water pressure road shield tunnel projects in China, the project faced extremely challenging construction conditions, including deep riverbed sections, high groundwater pressure, complex geological layers, and long-distance continuous excavation. During the entire tunneling process, the TBM tail sealing brush played a critical role in maintaining the sealing stability of the shield machine tail structure, ensuring safe and efficient excavation.

The Jiangyin-Jingjiang Yangtze River Tunnel uses a 16.09-meter diameter slurry shield machine, with a shield section length of 6,445 meters and a maximum buried depth of approximately 58 meters. The maximum water pressure in the river-crossing area reached nearly 0.6 MPa. Under such conditions, the shield tail sealing system must continuously withstand the pressure of groundwater, sediment, and grouting materials. Any sealing failure could lead to serious problems such as water leakage, sand inflow, ground settlement, and equipment downtime. Therefore, the quality and reliability of the TBM tail sealing brush have become essential factors affecting the safety and efficiency of shield tunneling operations.

Behind the stable operation of major shield projects is the support of professional sealing component manufacturers. Among domestic enterprises specializing in shield tail brush production, Chenxing Machinery has become a representative company with years of technical accumulation and industry experience. As a professional manufacturer focusing only on shield tail sealing brushes, Chenxing Machinery has produced more than 1.2 million sets of shield tail brushes, serving a wide range of tunnel construction projects in China and overseas markets. With strong product performance and reliable supply capability, the company once achieved around 70% market share in China’s shield tail brush industry, making it a well-recognized hidden champion in the domestic sector.

Unlike general mechanical component manufacturers that provide multiple categories of products, Chenxing Machinery concentrates exclusively on the research, development, production, and application of shield tail sealing brushes. This long-term focus allows the company to continuously improve material selection, structural design, manufacturing processes, and quality control systems. In the global export market, Chenxing Machinery is also one of the few enterprises that specializes only in shield tail sealing brush products, demonstrating its professional advantages and deep industry expertise.

For large-diameter shield machines, traditional sealing solutions often struggle to meet the requirements of high-pressure and long-distance excavation. Chenxing’s TBM tail sealing brush products adopt high-strength steel wire, wear-resistant metal components, and optimized filling materials to create a multi-layer sealing structure. The design helps improve resistance against water pressure, soil intrusion, and mechanical wear during continuous tunneling operations. Combined with precise grease injection systems, the sealing system can maintain stable pressure balance and effectively reduce the risk of leakage and abnormal wear.

During complex tunnel construction, shield machines may pass through various challenging environments, including soft soil layers, hard rock sections, fractured zones, and mixed geological conditions. The TBM tail sealing brush must maintain stable elasticity and sealing performance throughout thousands of excavation cycles. Through strict production standards and practical application experience, Chenxing Machinery’s products have been widely used in shield tunneling projects where reliability and durability are critical.

The development of ultra-large diameter shield tunnels has placed higher requirements on supporting components. From urban underground transportation networks to cross-river and cross-sea tunnel projects, the sealing performance of shield machines directly influences construction safety and project quality. The continuous application of high-performance TBM tail sealing brush products shows that specialized Chinese manufacturers are becoming increasingly competitive in the global tunneling equipment supply chain.

With more than one million units of production experience, professional manufacturing capability, and years of industry dedication, Chenxing Machinery continues to strengthen its position as a leading enterprise in the shield tail brush field. As underground engineering projects worldwide move toward larger diameters, deeper excavation, and more complex environments, high-quality TBM tail sealing brush solutions will remain a key technology supporting the future development of tunnel construction.