1、施工前高強度大六角頭螺栓連接副應按出廠批號復驗扭矩系數，其平均值和標準偏差應符合現行標準《鋼結構高強度螺栓連接的設計、施工及驗收規程》的規定；扭剪型高強度螺栓連接副應按出廠批號復驗預應力，其平均值和標準偏差應符合現行標準《鋼結構高強度螺栓連接的設計、施工及驗收規程》的規定。
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、對建筑結構等級為一級，跨度40m以上的螺栓球節點鋼網架結構，其連接高強度螺栓應進行表面硬度試驗。
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、制造廠和安裝單位應分別以鋼結構制造批為單位進行抗滑移系數實驗。
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、高強度螺栓連接安裝后要進行連接副的扭矩檢驗，檢驗分扭矩法檢驗和轉角法檢驗兩種。扭矩檢驗應在施擰1h后，48h內完成。
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、對于高強度螺栓終擰后的檢查，扭剪型高強度螺栓可采用目測法檢查螺栓尾部梅花頭是否擰掉；高強度大六角頭螺栓，可用“小錘敲擊法”逐個進行檢查。方法使用手指緊按住螺母相對應的一邊（盡量靠近墊圈處），用0.3～0.5kg重的小錘敲擊螺母相對應的另一邊，如手指感到輕微顫動即為合格，顫動較大即為欠擰和漏擰，完全不顫動即為超擰。由于超擰后螺栓可能出現塑性變形，為避免螺栓發生延遲斷裂，故超擰螺栓應予更換
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
The above is a detailed introduction to the electric wrench for torsion shear. I hope it will be helpful to you If you have any questions, please contact us We will provide you with professional service http://m.bjqunyao.com
