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针对目前井下普遍存在的锚杆杆尾预紧扭矩向预紧力转化效率低的问题,理论分析了预紧扭矩与预紧力之间的关系,建立了数学表达式,分析了锚杆杆尾预紧扭矩转化效率低的主要影响因素。利用锚杆预紧扭矩试验台,试验研究了锚杆杆尾螺纹加工精度、锚杆螺纹处直径及减磨垫片材质3种因素对杆尾预紧扭矩转化效率的影响,得出了螺纹加工精度、锚杆螺纹处直径及减磨垫片材质与锚杆杆尾预紧扭矩转化效率之间的关系,并通过井下试验加以验证。研究结果表明:提高杆尾螺纹加工精度,减小锚杆螺纹直径,使用合适的减摩垫片均能提高杆尾螺纹预紧扭矩向预紧力转化的效率,但减磨垫圈对其影响最显著。井下试验结果与试验室试验结果基本相符,进一步说明了螺纹加工精度、锚杆螺纹处直径及减磨垫片材质对锚杆杆尾预紧扭矩转化效率的影响。
Aiming at the problem of low conversion efficiency of pre-tightening torque to pre-tightening force, the relationship between pre-tightening torque and pre-tightening force is analyzed theoretically. A mathematical expression is established. The main influencing factors of low pre-tightening torque conversion efficiency. The influence of three kinds of factors, such as the machining accuracy of the bolt tail thread, the diameter of the bolt thread and the material of the anti-wear pad, on the torque conversion efficiency of the tail of the rod was studied by using the pre-tightening torque test bench. Accuracy, the diameter of the bolt and the relationship between the wear pad material and the pre-tightening torque conversion efficiency of the anchor rod, and verified by the downhole test. The results show that the efficiency of rod thread pre-tightening torque conversion to pre-tensioning can be improved by increasing the machining precision of rod-end thread and reducing the screw thread diameter. Significant. The downhole test results are in good agreement with the laboratory test results, further illustrating the influence of thread machining accuracy, the diameter of the anchor threads and the wear pad material on the pre-tightening torque conversion efficiency of the anchor rod.