1. Product quality: the surface rust, oil stain, nut hole wall burr, weld, etc. shall be cleaned; The contact friction surface shall meet the requirements of scratch resistance coefficient after treatment. The high-strength hot-dip galvanized bolts used shall be equipped with matching bolts and washers, which shall be used according to the matching and shall not be interchanged; During installation, the treated friction surface of the component shall not be stained with oil, soil and other sundries; The friction surface of the assembly shall be kept dry during installation and shall not be operated in the rain; During installation, the friction surface of the component shall be kept dry. Strictly check and correct the deformation of the connected steel plate before installation; During installation, it is strictly prohibited to hammer the nut to avoid damaging the thread of the nut. When using, please check the electric wrench regularly to ensure the accuracy of torque and operate according to the correct tightening sequence.

2. Installation safety technology: 1 The opening size of the wrench opened with a wrench shall be consistent with the size of the nut. It is not suitable to use a small wrench with a sleeve. Fixed wrench shall be used when working at height. If adjustable wrenches are used, they shall be fixed with ropes and safety belts shall be fastened. When assembling the connecting bolts of steel members, it is strictly prohibited to insert the connecting surface or detect the threaded hole by hand. When picking up and placing the sizing plate, put your fingers on both sides of the sizing plate. Attention must be paid to the above problems in the construction of hot-dip galvanized bolts to avoid unnecessary trouble.