Chinese Tunnel Boring Machine “DZ407”.. Advanced Precision and Technology for Metro Tunneling The DZ407 is a Chinese-built shield tunnel boring machine (TBM) designed for excavating metro tunnels and utility tunnels in major infrastructure projects. It operates using Earth Pressure Balance (EPB) technology and incorporates advanced excavation, segment installation, grouting, and guidance systems, enhancing tunnel stability and ensuring precise alignment in urban environments. Technical Specifications of the Chinese “DZ407” Tunnel Boring Machine The DZ407 is an Earth Pressure Balance (EPB) shield TBM designed for metro and utility tunnel construction, featuring: Excavation diameter: Approximately 6.8-6.98 meters. Overall length: Approximately 85-95 meters, including backup support systems. Total weight: Approximately 500-600 tonnes. Installed power: Approximately 1,500-2,000 kW. Cutterhead torque: Approximately 5,000-7,000 kN·m. Excavation system: Cutterhead equipped with cutting tools and disc cutters capable of handling sandy, clayey, and gravelly soils, as well as certain rock formations. Lining system: Automated installation of reinforced concrete segment rings during excavation. Grouting system: Injection of grout behind the segment lining to stabilize the tunnel and fill voids. Guidance and control: Advanced digital monitoring and navigation systems that track alignment, pressure, speed, torque, and temperature in real time, ensuring accurate tunnel construction.