扭剪型高強螺栓為什么要擰掉梅花頭？

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

　　扭剪型高強螺栓的連接副形式：連接副包括：一個螺桿，一個螺母，一個墊圈。

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

　　扭剪型高強螺栓安裝規(guī)定：安裝時高強螺栓應自由穿入孔內，不得強行敲打。螺栓不能自由穿入時，不得用氣割擴孔，要用絞刀絞孔，修孔時需使板層緊貼，以防鐵屑進入板縫，絞孔后要用砂輪機清除孔邊毛刺，并清除鐵屑。

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.

　　初擰緊固到螺栓標準軸力（即設計預拉力）的60%～80%，初擰的扭矩值不得小于終擰扭矩值的30%。從接頭剛度大的地方向不受約束的自由端進行。

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.

　　扭剪型高強螺栓，建議采用電動力矩扳手來進行安裝。只有當力矩達到要求后，高強螺栓的梅花頭才會被擰掉，這樣可以保證所使用的螺栓達到建議的預緊力從而保證性能。所以在工程中可以通過檢查梅花頭是否還在還判斷高強螺栓是否起到作用。

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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