用于高强度螺栓初拧、复拧和终拧的电动扭矩扳手，装置前有必要行查看标定，承认其精度在答应误差范围内，才干投人运用。电动扭矩扳手查看标定的需求如下:1，高强度螺栓紧固前后，均应对电动扭矩扳手进行查看标定，并承认其精度。 关于大型节点，高强度螺栓拧紧应分为初拧、复拧和终拧，不得省掉。复拧扭矩值应等于初拧扭矩值。
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.电动扭矩扳手标定精度:用于查看的扳手为运用扭矩的t3%，用于施工的扳手为运用扭矩的土5% 高强度螺栓不经初拧直接终拧，大型节点不经初拧、复拧直接终拧关于同一节点的高强度螺栓米用初拧的意图在于:一是为使节点衔接板叠到达密贴;二是为了削减先拧与后拧的高强度螺栓的预拉力的区别。假如不初拧直接终拧必然使终拧后的螺栓预拉力值受到丢失，螺栓间的预拉力值区别较大，影响衔接节点的刚度和强度。
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.
关于大型节点，高强度螺栓数量较多，先拧与后拧造成的螺栓预拉力值区别更大，初拧可使衔接板叠到达密贴，但不足以这些区别。因而有必要再次复拧一次以补偿初拧预拉力丢失，并铲除螺栓间预拉力值区别。关于这类节点，假如初拧后不通过复拧，直接终拧，也会影响衔接节点的刚度和强度高强度螺栓衔接节点的紧固，应通过初拧和终拧。初拧扭矩值为终拧扭矩值，初拧扭矩具体需求如下: 高强度螺栓的紧固进程也是衔接板叠密贴的进程，一起因为衔接板密贴变形时会影响螺栓群各个先后紧固的螺栓预拉力值的改变，因而高强度螺栓紧固不按次序，会影响衔接板叠不密贴和各螺栓预拉力值的离散度加大。
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.
The above is a detailed introduction to the special wrench for torsional shear bolts. I hope it will be helpful to you. If you have any questions, please contact us. We will provide you with professional services https://www.xjnwz.com
