Hollo-Bolt进口单向螺栓在预制件装配式施工中容易发生套管肢剪切破坏失效的问题。采用化学成分分析、硬度测试、金相检验、扫描电镜观察及中性盐雾试验等方法，分析了Hollo-Bolt在承载试验过程中失效的原因。结果表明：Hollo-Bolt带狭槽套管的选材较软，且缺乏合理的热处理工艺，其表面的镀锌防锈处理效果也不够理想，使其强度降低，导致套管肢发生剪切破坏。最后据此提出了优化方案。

Imported Hollo-Bolt one-way bolts were prone to shearing failure on position of the sleeve limbs during the prefabricated assembly construction. By means of chemical composition analysis, hardness testing, metallographic inspection, scanning electron microscopy observation and neutral salt spray test for the failure Hollo-Bolts, the reasons for failure during bearing test were analyzed. The results show that:the material of slotted sleeves of Hollo-Bolts was relatively soft and lack of reasonable heat treatment process, and the effect of galvanized anti-rust surface treatment was not ideal; as a result of it, the strength of the sleeves reduced, which led to the shear failure of sleeve limbs. Finally,the optimization proposals were put forward according to the reasons.