1. During installation, high-strength bolts should be freely penetrated into the hole, and forced tapping is not allowed. The washer of torsion shear high-strength bolt shall be installed on the side of the nut, and the side with chamfer in the washer hole shall be in contact with the nut and shall not be installed upside down (the washer of large hexagon head and high-strength bolt shall be installed on the side of the bolt head and the nut, and the side with chamfer in the washer hole shall be in contact with the bolt head and shall not be installed upside down).

2 螺栓不能自由穿入时，不得用气割扩孔，要用绞刀绞孔，修孔时需使板层紧贴，以防铁屑进入板缝，绞孔后要用砂轮机孔边毛刺，并铁屑。

2. When bolts cannot be penetrated freely, gas cutting shall not be used to ream holes, and reaming with a reamer shall be used. When repairing holes, the plate layer shall be close to prevent iron filings from entering the plate seam. After reaming holes, use a grinder to remove burrs at the hole edge and remove iron filings.

3 螺栓穿入方向宜一致，穿入高强螺栓用扳手紧固后，再卸下临时螺栓，以高强螺栓替换。不得在雨天安装高强螺栓，且摩擦面应处于干燥状态。

3 bolts should be threaded in the same direction. After threading high-strength bolts and tightening them with a wrench, remove the temporary bolts and replace them with high-strength bolts. High strength bolts shall not be installed in rainy days, and the friction surface shall be dry.

4.高强螺栓的紧固：必须分两次进行，次为初拧。初拧紧固到螺栓标准轴力（即设计预拉力）的60%～80%，初拧的扭矩值不得小于终拧扭矩值的30%。第二次紧固为终拧，终拧时扭剪型高强螺栓应将梅花卡头拧掉。为使螺栓群中所有螺栓均匀受力，初拧、终拧都应按一定顺序进行。一般接头：应从螺栓群中间顺序向外侧进行紧固。从接头刚度大的地方向不受约束的自由端进行。从螺栓群向四周扩散的方式进行。

4. Fastening of high-strength bolts: it must be carried out in two times, and the first time is initial tightening. The initial tightening shall be tightened to 60% - 80% of the standard axial force (i.e. design pretension) of the bolt, and the torque value of the initial tightening shall not be less than 30% of the torque value of the final tightening. The second tightening is the final tightening. During the final tightening, the Torx clamp shall be screwed off. In order to make all bolts in the bolt group bear the force evenly, the initial tightening and final tightening should be carried out in a certain order. General joints: tighten from the middle of the bolt group to the outside. From the place with large joint stiffness to the unrestrained free end. From the center of the bolt group to the surrounding areas.

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