Innovative drilling methods gain importance in the field of post-installed fasteners. For this reason, users, customers and manufacturers demand methods other than the standard drilling procedure of hammer drilling, as they are hollow drilling with included cleaning and diamond drilling without emitting drill dust. One open question regarding these drilling methods is the equivalence of the behavior under the conditions of cracked concrete over the entire lifetime. These conditions are typically tested in the crack movement test, which simulates the real behavior of a fastener in cracked concrete over a designed lifetime of 50 years. In this contribution, the example of a post-installed mechanical bolt anchor is used to explain how a difference in the behavior is a consequence of different drilling methods in noncracked concrete, in cracked concrete and in cracked concrete in which the crack is cycled. Additionally, it is observed that the behavior in the crack cycling test is significantly influenced by the drilling method.

中文翻译：

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不同钻孔方法对未开裂和开裂混凝土中后装机械紧固件性能的影响

创新的钻孔方法在后装紧固件领域越来越重要。为此，用户、客户和制造商需要不同于锤钻标准钻孔程序的方法，因为它们是空心钻孔，包括清洁和金刚石钻孔，不排放钻屑。关于这些钻孔方法的一个悬而未决的问题是在整个生命周期内开裂混凝土条件下行为的等效性。这些条件通常在裂纹移动测试中进行测试，该测试模拟了紧固件在 50 年设计寿命内在开裂混凝土中的真实行为。在这篇文章中，使用后安装机械锚栓的例子来解释行为的差异是如何在非开裂混凝土中使用不同的钻孔方法造成的，在开裂混凝土和裂缝循环的开裂混凝土中。此外，观察到裂纹循环试验中的行为受钻孔方法的显着影响。