For many applications the concrete screws require loosening and retightening to facilitate attachment and realignment or allow levelling of the attached component. As this type of installation procedure is not covered by the current version of European Assessment Document (ETAG 001-3 used as European Assessment Document according to Art. 66 (3) of the Construction Products Regulation(CPR)) and may have a significant influence on the performance(mechanical resistance and stability) of the fastening, this setting process (if permitted for a specific product) needs to be accounted for in the assessment of the anchor to fulfil safety in use requirements.
The mechanical interlock is achieved by screwing the anchor into a pre-drilled cylindrical hole. The special thread of the anchor cuts an internal thread into the concrete member while setting. This type of anchor is commonly referred to as concrete screw. Concrete screws with a thread over the entire anchorage depth are covered only.
This EAD applies to anchors in which all the metal parts directly anchored in the concrete and designed to transmit the applied loads are made of either carbon steel, stainless steel or a combination thereof.
Characteristic resistance under static and quasi-static loading 静态和准静态载荷下的阻力特性 Characteristic resistance under seismic loading 地震荷载下特性 Displacements 移位 Reaction to fire 防火等级
Under the CPR, harmonised technical specifications are harmonised European product standards (hENs) established by CEN/CENELEC2 or European Assessment Documents (EADs) produced by the European CPR指令认证的依据是建筑指令欧盟协调标准或欧盟评估文件（EADs）
European Organisation for Technical Approvals (EOTA) as the basis for issuing ETAs for products not covered by hENs.The harmonised technical specification for a product defines EEA-wide methods of assessing and declaring 对于没有被协调标准完全覆盖的建筑产品的认证，可以通过EOTA机构核发ETA认证证书（等同于CE认证书）。
欧盟公告NB机构&TAB机构-捷克TZUS (NB1020)介绍
TZUS是欧盟公告号机构，其欧盟公告号为1020(Notified Body 1020-NB1020)。可以根据欧盟相关规定来签发CE证书。 TZUS同时也是ETA(European Technical Approval)的认证委员之一，可以根据相关法规来签发ETA证书。
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