超大直径盾构管片拼装机关键技术

依托15.03 m超大直径泥水盾构机管片拼装的需求，结合汕头海湾隧道管片及密封挤压力的参数，分析回转直径为9.2 m的超大惯量管片拼装机负载分布与变化情况. 根据分析结果优化了拼装机伸缩机构的结构尺寸，有效降低了伸缩机构的最大摩擦力；针对拼装机超大惯量变负载工况速度稳定控制的难点，设计管片拼装机回转液压系统，通过AMESim仿真分析变负载工况对系统的响应性能和速度稳定性的影响. 研究结果表明，伸缩机构伸缩油缸的侧向摩擦阻力与导向套长度负相关；设计的液压系统不仅能够实现较大范围的调速要求，而且速度控制稳定可靠，能够有效降低负载交变对回转速度稳定性的影响.

Key technologies of segment erector for super-large shield machine

The load distribution and variation of 9.2 m segment erector with high moment of inertia were analyzed combined with the segment and sealing extrusion force parameters of Shantou Gulf Tunnel based on the segment erecting requirements for super large slurry shield machine of 15.03 m diameter. The structure design of segment erector telescoping mechanism was optimized according to the analysis results, which effectively reduced the maximum friction of telescoping mechanism. The rotary hydraulic system of segment erector was designed aiming at the difficulty of speed stabilization control of segment erector with high moment of inertia under variable load conditions. The influence of variable load conditions on the response performance and speed stability of the system was analyzed by AMESim simulation. Results showed that the lateral friction resistance of telescopic cylinder of telescoping mechanism was negatively correlated with the length of guide sleeve. The designed hydraulic system can not only meet the requirement of wide range speed regulation, but also have stable and reliable speed control, which can effectively reduce the influence of load alternation on the stability of rotary speed.