Joints are pivotal components in prefabricated station technology, requiring development to meet diverse requirements such as site conditions, safety, stability, operability, and waterproofing. CHC joints, while addressing these factors, offer the advantages of easy assembly and clear force transmission. These advantages of the CHC joints have been verified in the application of Pingxi Station in Shenzhen, China. Furthermore, the mechanical transmission mechanism of CHC joints is novel and distinct from existing joint types. This study, employing experimental methods, conducts further investigation into the flexural mechanical properties of CHC joints, elucidating their flexural behavior and failure modes. The findings indicate that the axial force transmission mechanism of CHC joints ensures stable tension transmission under bending moment loads; the flexural stiffness of joints exhibits pronounced nonlinearity; and the failure mode of joints resembles that of reinforced concrete beams with adequate reinforcement, demonstrating ductile failure. This research offers valuable insights for the design of CHC joints.