一、前言近几年来,在全国许多地区的输电线路中发现环形混凝土电杆发生不同程度的裂缝,尤其自1964年开始应用预应力混凝土电杆以来,纵裂问题突出,严重地影响了线路的长期安全运行。运行中的电杆出现裂缝是多种因素综合作用的结果,但其中必有一主要因素在起作用,而不同地区其主要的破坏因素又往往不同。只有对电杆的裂缝进行比较全面的调查与研究,找出其主要的破坏因素,才能比较正确地认识电杆的裂缝问题。目前对电杆裂缝成因的分析,往往只是 I. INTRODUCTION In recent years, cracks of various degrees have been found in transmission lines in many areas of the country, especially since the application of prestressed concrete poles in 1964, the problems of longitudinal cracks have been prominent, seriously affecting the line. Long-term safe operation. The occurrence of cracks in the running poles is the result of a combination of various factors, but one of them must be at work, and the main damage factors in different regions are often different. Only by conducting comprehensive investigations and studies on the cracks of the poles and finding out the major destructive factors can we correctly understand the cracks in the poles. The current analysis of the cause of cracks in electric poles is often only