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

扭剪型高强螺栓安装规定：

Installation regulations of torsional shear type 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, high strength bolts shall be free to penetrate into the hole and shall not be forced to knock. The washer of torsional shear type high strength bolt shall be installed on one side of the nut, and the chamfered side of the washer hole shall be in contact with 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 chamfered side of the washer hole shall be in contact with 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 be penetrated freely, the hole shall not be reamed by gas cutting, and the hole shall be reamed with a reamer. During hole repair, the plate layer shall be close to each other to prevent iron chips from entering the plate seam. 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. The threading direction of the bolts should be consistent. After the high-strength bolts are tightened with spanners, 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 bolt: it must be carried out twice, and the first time is the initial tightening. The initial tightening should be 60% - 80% of the standard axial force (i.e. the designed pre tension), and the torque value of the initial tightening should not be less than 30% of the final tightening torque value. The second tightening is the final tightening. When the final tightening, the plum blossom chuck should be screwed off. In order to make all bolts in the bolt group bear uniform force, the initial tightening and final tightening should be carried out in a certain order. General joints: the bolts shall be tightened from the middle to the outside. It is carried out from the place where the joint stiffness is large to the unrestrained free end. Spread from the center of bolt group to the surrounding.

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