针对现有盾构隧道传统管片接头拼装效率低、连接件抗弯性能不足等问题，开展面向快拼式的新型G接头结构设计及抗弯性能分析研究。首先，基于零件设计方法及传统C-T接头结构，提出一种新型快拼G接头设计方案；其次，基于设计方案完成G接头设计，并结合实际工况开展G接头力学特性分析； 然后，基于G接头抗拉力学性能开展结构优化设计，最终确定满足快拼特点及力学特性的新型快拼G接头形式； 最后，基于结构、材料等属性特征建立3种管片接头模型，并结合实际工况开展斜螺栓接头、C-T接头和G接头的抗弯刚度分析，对比三者的接头变形与弯矩转角。结果表明：
新型G接头实现了抗弯刚度提升，相对斜螺栓接头、C-T接头分别提升289%、161%。
The traditional segment
joint of shield tunnels has several drawbacks, such as low assembly efficiency
and poor bending performance. To address these issues, a structural design and
bending performance analysis of a novel G joint is conducted. First, a novel
fast assembling G joint design is proposed by combining the part design method
with the traditional C-T joint
structure. Based on this design proposal, a G joint is developed, and its
mechanical characteristics are analyzed under actual working conditions.
Following this, the structural design of the G joint is further optimized,
focusing on its tensile properties. This process led to the creation of a fast-splicing head satisfying the requirements for fast splicing and
strong mechanical performance. Finally, three segment joint models are
established, considering their structural and material attributes. The bending
stiffness of the inclined bolt joint, C-T joint, and
the G joint is analyzed based on real-world conditions.
Their deformation and bending moment angles are compared. The results reveal
that the bending stiffness of the novel G joint is 289% higher than that of the
inclined bolt joint and 161% higher than the C-T joint.
