钢筋螺旋肋灌浆套筒连接性能试验分析

The traditional grouting sleeve manufacturing process is hindered by its complexity, high raw material costs, and challenges in ensuring grouting quality, which has restricted the widespread adoption of prefabricated assembly buildings in China. To address these issues and promote economical, environmentally friendly, and efficient development in the construction industry, an innovative steel grouting sleeve connection technology was developed. This new approach employs a “rolled spiral rib grouting sleeve” in combination with “Bingham-like fluid grout,” which creates a more secure mechanical interlock between the reinforcement bar and grout, as well as between the grout and sleeve. This enhanced interlocking mechanism significantly improves the load-bearing capacity of connected components. The developed technology offers several advantages, including costs reduced, construction processes simplified, and grouting quality assurance improved. To determine the minimum anchorage length of reinforcement bars within this connection system and to compare the connection performance between centered and offset butt joints, unidirectional tensile tests on 34 joint specimens were conducted, and the damage modes and various structural performance indices of the specimens were thoroughly analyzed. The results indicate that the differences in connection performance is minimal between offset and centered butt joints within the sleeve. Additionally, the internal convex ribs within the rolled sleeve significantly enhance grout slip resistance and provide sufficient bond anchorage to meet connection performance requirements. Preliminary findings suggest that the minimum anchorage length of the reinforcement in this proposed connection system can be as short as 10 times the diameter of the reinforcement for offset butt joints.