For the electric torque wrench used for initial, re and final tightening of high-strength bolts, it is necessary to check and calibrate it before installing it, and only after confirming that its accuracy is within the allowable error range can it be put into use. The requirements for checking and calibrating the electric torque wrench are as follows: 1. Before and after tightening the high-strength bolts, the electric torque wrench should be checked and calibrated, and its accuracy should be recognized. For large joints, the tightening of high-strength bolts shall be divided into initial tightening, re tightening and final tightening, which shall not be omitted. The re tightening torque value shall be equal to the initial tightening torque value.

2.電動扭矩扳手標(biāo)定精度:用于查看的扳手為運用扭矩的t3%，用于施工的扳手為運用扭矩的土5% 高強(qiáng)度螺栓不經(jīng)初擰直接終擰，大型節(jié)點不經(jīng)初擰、復(fù)擰直接終擰關(guān)于同一節(jié)點的高強(qiáng)度螺栓米用初擰的意圖在于:一是為使節(jié)點銜接板疊到達(dá)密貼;二是為了削減先擰與后擰的高強(qiáng)度螺栓的預(yù)拉力的區(qū)別。假如不初擰直接終擰必然使終擰后的螺栓預(yù)拉力值受到丟失，螺栓間的預(yù)拉力值區(qū)別較大，影響銜接節(jié)點的剛度和強(qiáng)度。

2. Calibration accuracy of electric torque wrench: the wrench used for checking is t3% of the applied torque, and the wrench used for construction is 5% of the applied torque. High strength bolts are directly and finally tightened without initial tightening, and large nodes are directly and finally tightened without initial tightening and re tightening. The purpose of initial tightening for high-strength bolts at the same node is: first, to make the joint plate stack close; The second is to reduce the difference between the pretension of high-strength bolts screwed first and then. If the bolts are directly final tightened without initial tightening, the pretension value of the bolts after final tightening will be lost, and the pretension value between bolts will be greatly different, which will affect the stiffness and strength of the joint.

關(guān)于大型節(jié)點，高強(qiáng)度螺栓數(shù)量較多，先擰與后擰造成的螺栓預(yù)拉力值區(qū)別更大，初擰可使銜接板疊到達(dá)密貼，但不足以這些區(qū)別。因而有必要再次復(fù)擰一次以補(bǔ)償初擰預(yù)拉力丟失，并鏟除螺栓間預(yù)拉力值區(qū)別。關(guān)于這類節(jié)點，假如初擰后不通過復(fù)擰，直接終擰，也會影響銜接節(jié)點的剛度和強(qiáng)度高強(qiáng)度螺栓銜接節(jié)點的緊固，應(yīng)通過初擰和終擰。初擰扭矩值為終擰扭矩值，初擰扭矩具體需求如下:    高強(qiáng)度螺栓的緊固進(jìn)程也是銜接板疊密貼的進(jìn)程，一起因為銜接板密貼變形時會影響螺栓群各個先后緊固的螺栓預(yù)拉力值的改變，因而高強(qiáng)度螺栓緊固不按次序，會影響銜接板疊不密貼和各螺栓預(yù)拉力值的離散度加大。

For large joints, there are many high-strength bolts, and the difference between the pre tension value of bolts caused by first tightening and then tightening is greater. The initial tightening can make the joint plate stack close, but it is not enough to eliminate these differences. Therefore, it is necessary to re tighten again to compensate for the loss of pretension during initial tightening and to eliminate the difference in pretension between bolts. For this type of joints, if the initial tightening is not through re tightening, and the direct final tightening will also affect the stiffness and strength of the joint. The fastening of the joint with high-strength bolts should be through the initial tightening and final tightening. The initial tightening torque value is the final tightening torque value, and the specific requirements of the initial tightening torque are as follows: the tightening process of high-strength bolts is also the process of splicing plates. Because the deformation of the splicing plates will affect the change of the pre tension value of the bolts tightened successively in the bolt group, so the tightening of high-strength bolts is not in order, which will affect the cohesion of the splicing plates and increase the dispersion of the pre tension value of each bolt.

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