1. Torque method

依據(jù)扭矩M與預(yù)拉力成正比的閉系,先用一般扳手將螺帽發(fā)端擰緊,而后采取可顯現(xiàn)扭矩值的扳手?jǐn)Q決定的扭矩值。

According to the closed system in which the torque M is proportional to the pretension, first tighten the nut with a general wrench, and then use a wrench that can show the torque value to the determined torque value.

2、轉(zhuǎn)角法

2. Angle method

依據(jù)板層間密切交觸后,高強(qiáng)度螺栓的轉(zhuǎn)化角度與螺栓的預(yù)拉力成正比閉系決定的一種方式。緊固時(shí),先用短扳手將螺帽擰沒有轉(zhuǎn)化的位子,而后再用長扳手將螺帽擰決定位子,以到達(dá)預(yù)拉力。

According to the close contact between plates, the transformation angle of high-strength bolts is directly proportional to the pretension of bolts. When tightening, first screw the nut to the position without conversion with a short wrench, and then screw the nut to the decision position with a long wrench to reach the pre tension.

3、擰斷螺栓尾部

3. Unscrew the bolt tail

用于扭剪型高強(qiáng)度螺栓,此螺栓有一特制的尾部。緊固時(shí),用扳手套住螺栓和螺栓尾部,一個(gè)套筒正轉(zhuǎn),另一個(gè)套筒回轉(zhuǎn),在螺帽擰緊到必定水平時(shí),螺栓尾部擰斷。因?yàn)槁菟ㄎ膊康牟劭谏疃仁前磾Q斷扭矩和預(yù)緊拉力之間的閉系決定的,所以擰斷時(shí)便到達(dá)相應(yīng)的預(yù)拉力值。

It is used for torsion shear high-strength bolt, which has a special tail. When tightening, use a wrench to cover the bolt and the bolt tail. One sleeve rotates forward and the other sleeve rotates. When the nut is tightened to a certain level, the bolt tail is broken. Because the notch depth at the tail of the bolt is determined by the close relationship between the screwing torque and the pre tensioning force, the corresponding pre tensioning force value will be reached when screwing off.