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<p>A kind of thrust system with anti-rotation capability for shield tunneling machines was proposed to address the problems of thrust force and the reaction of cutterhead rotation torque on the shield body (shield self-rotation) under complex geological conditions. In the thrust system, the hydraulic cylinders were arranged in pairs with the same installation angle but opposite deflection directions, thereby enabling a dual-mode operation strategy: a dual-cylinder synchronous mode was adopted in hard strata to provide high thrust, whereas a selective single-cylinder mode was employed in soft strata, in which the radial force component generated a compensating torque to resist shield rotation. Firstly, a mechanical model of the thrust system was established in consideration of actual tunneling conditions. Subsequently, by analyzing the force transmission characteristics of the thrust system, a spatial force ellipse model was derived. Next, this model was applied to the thrust system of a 6.15&#xa0;m-diameter shield machine equipped with 24 hydraulic cylinders, and the adaptability of the system to varying geological conditions was evaluated through coefficient of variation analysis. Finally, a virtual prototype of the thrust system was constructed to verify the model’s effectiveness. The results showed that under the single-load condition defined by this model, the system could provide a torque ranging from 3662 kN·m to 7468 kN·m via radial force components when operating in single-cylinder mode in soft strata, by adjusting the hydraulic cylinder deflection angles. This torque range fully covers the 5830 kN·m operational torque requirements of the shield machine used in Phase II of Beijing Metro Line 6. The research results provided theoretical and technical support for the design of the anti-rotation thrust system. Moreover, the proposed thrust system exhibited significant adaptability to different geological conditions, offering theoretical support for improving thrust control performance in complex strata.</p>

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A dual-mode anti-rotation thrust system for shield machines based on oppositely deflected cylinder pairs

  • 期刊论文

  • 发表日期：

    2026年8月5日

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  • Kongshu Deng,
  • Shang Jiang,
  • Yuanyuan Li,
  • Wei Huang,
  • Bingyan Yan

摘要

A kind of thrust system with anti-rotation capability for shield tunneling machines was proposed to address the problems of thrust force and the reaction of cutterhead rotation torque on the shield body (shield self-rotation) under complex geological conditions. In the thrust system, the hydraulic cylinders were arranged in pairs with the same installation angle but opposite deflection directions, thereby enabling a dual-mode operation strategy: a dual-cylinder synchronous mode was adopted in hard strata to provide high thrust, whereas a selective single-cylinder mode was employed in soft strata, in which the radial force component generated a compensating torque to resist shield rotation. Firstly, a mechanical model of the thrust system was established in consideration of actual tunneling conditions. Subsequently, by analyzing the force transmission characteristics of the thrust system, a spatial force ellipse model was derived. Next, this model was applied to the thrust system of a 6.15 m-diameter shield machine equipped with 24 hydraulic cylinders, and the adaptability of the system to varying geological conditions was evaluated through coefficient of variation analysis. Finally, a virtual prototype of the thrust system was constructed to verify the model’s effectiveness. The results showed that under the single-load condition defined by this model, the system could provide a torque ranging from 3662 kN·m to 7468 kN·m via radial force components when operating in single-cylinder mode in soft strata, by adjusting the hydraulic cylinder deflection angles. This torque range fully covers the 5830 kN·m operational torque requirements of the shield machine used in Phase II of Beijing Metro Line 6. The research results provided theoretical and technical support for the design of the anti-rotation thrust system. Moreover, the proposed thrust system exhibited significant adaptability to different geological conditions, offering theoretical support for improving thrust control performance in complex strata.