In this paper, the writer studied a new detecting technique-expanding bolt pulloutmethod by using expanding bolt as bulkhead.
本文采用胀栓作为锚固件，研究胀栓拔出法新无损检测技术。
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Finally, the thesis analyzed the concrete failure mechanism of expanding bolt pulloutmethod and summarized the influence of it.
本文分析了胀栓拔出法混凝土破坏机理，总结了胀栓拔出法的各种影响因素。
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Objective: To compare the initial stability and pullout strength of threaded and non threaded cervical interbody fusion devices on human specimens by biomechanical method.