1. Before construction, the torque coefficient of high-strength large hexagon bolt connection pair shall be rechecked according to the factory batch number, and its average value and standard deviation shall comply with the provisions of the current national standard code for design, construction and acceptance of high-strength bolt connection of steel structures; The prestress of torsional shear type high-strength bolt connection pair shall be re inspected according to the factory batch number, and its average value and standard deviation shall comply with the provisions of the current national standard code for design, construction and acceptance of high-strength bolt connection of steel structures.

2、对建筑结构安全等级为一级，跨度40m以上的螺栓球节点钢网架结构，其连接高强度螺栓应进行表面硬度试验。

2. For the steel grid structure with bolt ball joints with a span of more than 40m and the safety level of the building structure is level I, the surface hardness test shall be carried out on the connecting high-strength bolts.

3、制造厂和安装单位应分别以钢结构制造批为单位进行抗滑移系数实验。

3. The manufacturer and the installation unit shall carry out the anti slip coefficient test with the steel structure manufacturing batch as the unit respectively.

4、高强度螺栓连接安装后要进行连接副的扭矩检验，检验分扭矩法检验和转角法检验两种。扭矩检验应在施拧1h后，48h内完成。

4. After the installation of high-strength bolt connection, the torque inspection of the connection pair should be carried out, which can be divided into torque method inspection and angle method inspection. The torque inspection shall be completed within 48h after 1h of tightening.

5、对于高强度螺栓终拧后的检查，扭剪型高强度螺栓可采用目测法检查螺栓尾部梅花头是否拧掉；高强度大六角头螺栓，可用“小锤敲击法”逐个进行检查。方法使用手指紧按住螺母相对应的一边（尽量靠近垫圈处），用0.3～0.5kg重的小锤敲击螺母相对应的另一边，如手指感到轻微颤动即为合格，颤动较大即为欠拧和漏拧，完全不颤动即为超拧。由于超拧后螺栓可能出现塑性变形，为避免螺栓发生延迟断裂，故超拧螺栓应予更换

5. For the inspection of high-strength bolts after final tightening, visual inspection can be used to check whether the plum blossom head at the end of the bolt is screwed off; High strength large hexagon head bolts can be inspected one by one with the "small hammer tapping method". Methods press the corresponding side of the nut tightly with your fingers (as close to the washer as possible), and knock the corresponding side of the nut with a small hammer weighing 0.3 ~ 0.5kg. If your fingers feel slight vibration, it is qualified. If the vibration is large, it is under tightening and missing tightening, and if there is no vibration at all, it is over tightening. Since the bolt may have plastic deformation after over tightening, in order to avoid delayed fracture of the bolt, the over tightening bolt should be replaced

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