In this study, an investigation was conducted on the rehabilitation of longitudinally cracked reinforced concrete pipes (RCPs) under preloaded conditions using the spraying method, based on TEB tests. The effects of sustaining preload and not sustaining preload on the performance of the rehabilitated pipes were examined, alongside the relationship between external loads and pipe displacement, strain, and cracks. The results revealed that the bearing capacity of the rehabilitated pipe increased by 5.6% in Specimen B, which was unloaded after preload, and by 22.7% in Specimen C, which maintained preload, compared to the pre-rehabilitation pipe. Compared with Specimen B, the ultimate bearing capacity of the repaired pipe in Specimen C increased by 12.8%, although the displacement at failure was significantly reduced. The failure of the repaired pipe-lining structure primarily occurred through longitudinal cracking and interfacial detachment of the lining. The application of spray lining improves the structural performance of damaged pipe, especially for specimens that maintain preloading.

中文翻译：

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预压下喷涂法 RCP 修复结构性能的实验研究


在这项研究中，基于 TEB 测试，使用喷涂方法对预紧条件下纵向开裂钢筋混凝土管 （RCP） 的修复进行了调查。研究了维持预紧力和不维持预紧力对修复管道性能的影响，以及外部荷载与管道位移、应变和裂缝之间的关系。结果表明，与修复前管道相比，在预紧后卸载的试样 B 中，修复管的承载力增加了 5.6%，在保持预紧力的试样 C 中，修复管的承载力增加了 22.7%。与试件 B 相比，试件 C 中修复管的极限承载力提高了 12.8%，但破坏时的位移显著降低。修复后的管道衬里结构的破坏主要通过衬里的纵向开裂和界面分离发生。喷涂衬里的应用改善了受损管道的结构性能，特别是对于保持预紧力的试样。