為了減少先擰與后擰的高強度螺栓預(yù)拉力的差別，其擰緊必須分為初擰和終擰兩步進行，對于大型節(jié)點，螺栓數(shù)量較多，則需要增加一道復(fù)擰工序，復(fù)擰扭矩仍等于初擰的扭矩，以保證螺栓均達到初擰值。
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.
《鋼結(jié)構(gòu)施工質(zhì)量驗收規(guī)范》GB50205-2001要求在高強螺栓初擰后，24小時內(nèi)進行終擰。在終擰后的1小時后，48小時內(nèi)要對其進行檢測驗收。（做檢測記錄）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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