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What is the initial tightening and final tightening of steel structure high-strength bolts
'Code for Acceptance of Steel Structure Construction Quality' GB50205-2001 requires that the final tightening of high-strength bolts be performed within 24 hours after the initial tightening. One hour after the final screwing, it must be tested and accepted within 48 hours. (Make test records) Use the convolution method more often. (Guide: Sharing several nut thread anti-loosening methods)
In order to reduce the difference between the pretension of the high-strength bolts that are screwed first and screwed later, the tightening must be divided into two steps: initial tightening and final tightening. For large nodes, where the number of bolts is large, it is necessary to add a re-tightening process. The re-tightening torque is still equal to the initial tightening torque to ensure that the bolts reach the initial tightening value.
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