扭剪型高强螺栓为什么要拧掉梅花头？

Why do we need to unscrew the plum blossom head of the torsion shear high-strength bolt?

　　扭剪型高强螺栓的连接副形式：连接副包括：一个螺杆，一个螺母，一个垫圈。

The connection pair form of torsion shear high-strength bolts: The connection pair includes: a screw, a nut, and a washer.

　　扭剪型高强螺栓安装规定：安装时高强螺栓应自由穿入孔内，不得强行敲打。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。

Installation regulations for torsion shear high-strength bolts: During installation, the high-strength bolts should be freely inserted into the holes and not forcefully knocked. When the bolt cannot be freely inserted, gas cutting should not be used to expand the hole. A reamer should be used to drill the hole. When repairing the hole, the plate layer should be tightly adhered to prevent iron filings from entering the plate joint. After drilling, a grinder should be used to remove burrs at the edge of the hole and remove iron filings.

　　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%。从接头刚度大的地方向不受约束的自由端进行。

The initial tightening should be tightened to 60% to 80% of the standard axial force (i.e. design pre tension) of the bolt, and the torque value of the initial tightening should not be less than 30% of the final tightening torque value. Move from the area with high joint stiffness towards the unconstrained free end.

　　扭剪型高强螺栓，必须采用电动力矩扳手来进行安装。只有当力矩达到要求后，高强螺栓的梅花头才会被拧掉，这样可以保证所使用的螺栓达到必须的预紧力从而保证性能。所以在工程中可以通过检查梅花头是否还在还判断高强螺栓是否起到作用。

Twist shear high-strength bolts must be installed using an electric torque wrench. Only when the torque meets the requirements, the plum blossom head of the high-strength bolt will be unscrewed, which can ensure that the bolt used reaches the necessary pre tightening force to ensure performance. So in engineering, it is possible to determine whether high-strength bolts are effective by checking whether the plum blossom head is still present.

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