In order to reduce the difference between the pre tension of high-strength bolts that are tightened first and then, the tightening must be carried out in two steps: initial tightening and final tightening. For large nodes with a large number of bolts, a re tightening process needs to be added. The re tightening torque is still equal to the torque of initial tightening, so as to ensure that all bolts reach the initial tightening value.

《钢结构施工质量验收规范》GB50205-2001要求在高强螺栓初拧后，24小时内进行终拧。在终拧后的1小时后，48小时内要对其进行检测验收。（做检测记录）多用“回旋法”。

Code for Acceptance of Construction Quality of Steel Structures (GB50205-2001) requires final tightening of high-strength bolts within 24 hours after initial tightening. After 1 hour of final tightening, it shall be inspected and accepted within 48 hours. (Make inspection records) Use the "convolution method".

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