考研预报名的意义(考研预报名的意义是什么)

考研预报名的意义，考研预报名的意义是什么

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Pre-installation Verification Testing is essential for:

安装前验证测试对于以下情况具有指导意义:

(1) Evaluating the suitability of the bolting assembly, including the lubrication that is applied by the Manufacturer or specially applied, to develop the specified minimum pretension; 评估螺栓组件的适用性，包括制造商使用的或专门使用的润滑，以达到规定的最小预紧力;

(2) Verifying the adequacy and proper use of the specified pretensioning method to be used; 核实所采用的指定预张紧方法是否足够及正确使用;

(3) Determining the installation torque for the calibrated wrench method of pretensioning; 确定校准扳手预紧法的安装扭矩;

(4) Verifying the initial torque applied achieves at least the required initial tension when using the combined method of pretensioning;

验证所施加的初始扭矩在使用预紧组合方法时至少达到所需的初始张力;

(5) Demonstrating the suitability of the bolt tightening equipment to be used during installation.演示安装过程中使用的螺栓紧固设备的适用性。

Pre-installation verification testing provides a practical means for ensuring that nonconforming bolting assemblies are not incorporated into the work. Experience on many projects has shown that bolts, nuts, and/or bolting assemblies not meeting the requirements of the applicable ASTM standards would have been identified prior to installation if they had been tested as an assembly in a bolt tension measurement device. The expense of replacing bolts installed in the structure when the non-conforming bolts were discovered at a later date would have been avoided.

安装前验证测试提供了一种实用的方法，以确保不合格的螺栓组件不会被纳入工作中。许多项目的经验表明，如果螺栓、螺母和/或螺栓组件在螺栓张力测量装置中作为组件进行测试，则不符合适用的ASTM标准要求的螺栓、螺母和/或螺栓组件在安装之前就会被识别出来。以后发现不合格螺栓时，更换结构中安装的螺栓的费用就可以避免了。

Additionally, pre-installation verification testing clarifies for the bolting crew and the Inspector the proper implementation of the selected pretensioning method and the adequacy of the installation equipment. It will also identify potential sources of problems, such as the need for lubrication (when permitted) to prevent failure of bolts by combined high torque with tension, under-strength assemblies resulting from excessive overtapping of hot-dip galvanized nuts, or other failures to meet strength or geometry requirements of applicable ASTM standards, such as the use of mismatched bolting components (e.g., a Grade C nut on an F3125 Grade A490 bolt).

此外，安装前验证测试为螺栓人员和检验员澄清了所选预张紧方法的正确实施和安装设备的充分性。它还将确定潜在的问题来源，例如需要润滑(在允许的情况下)，以防止高扭矩和张力组合导致螺栓失效，热浸镀锌螺母过度敲打导致强度不足的组件，或其他无法满足适用的ASTM标准的强度或几何要求的失败，例如使用不匹配的螺栓组件(例如，在F3125级A490螺栓上使用C级螺母)。

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#使用高强度螺栓的结构连接规范

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