The form of connection pair of torsional shear high-strength bolt is specified in GB / t3632-2008: the connection pair includes: a screw / a nut / a washer.

扭剪型高强螺栓安装规定：

Installation regulations for torsional shear high strength bolts:

1安装时高强螺栓应自由穿入孔内，不得强行敲打。扭剪型高强螺栓的垫圈安在螺母一侧，垫圈孔有倒角的一侧应和螺母接触，不得装反（大六角头、高强螺栓的垫圈应安装在螺栓头一侧和螺母一侧，垫圈孔有倒角一侧应和螺栓头接触，不得装反）。

1. During installation, the high-strength bolt shall freely penetrate into the hole and shall not be knocked by force. The washer of torsion shear high-strength bolt shall be installed on the nut side, and the side with chamfer in the washer hole shall contact the nut and shall not be installed reversely (the washer of large hexagon head and high-strength bolt shall be installed on the bolt head side and nut side, and the side with chamfer in the washer hole shall contact the bolt head and shall not be installed reversely).

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，绞孔后要用砂轮机清除孔边毛刺，并清除铁屑。

2. When the bolt cannot penetrate freely, it is not allowed to ream the hole with gas cutting. The hole shall be reamed with a reamer. When repairing the hole, the plate layer shall be close to prevent iron filings from entering the plate joint. After reaming, the burr at the hole edge shall be removed with a grinder and the iron filings shall be removed.

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，一次为初拧。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%。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, one for 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 final tightening torque value. The secondary tightening is the final tightening. During the final tightening, the plum blossom bayonet shall be screwed off by the torsion shear high-strength bolt. In order to make all bolts in the bolt group bear stress evenly, the initial tightening and final tightening shall be carried out in a certain order. General joints: fasten from the middle of the bolt group to the outside. From the place with large joint stiffness to the unrestrained free end. Spread from the center of the bolt group to all around.