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一、引言近来,全国各地高压输电线路使用的环形预应力混凝土电杆发生纵向裂纹的现象相当普遍,它直接威胁着电网的安全可靠运行,引起了各有关部门和线路工作者的关注。现在,很多单位都在探索和研究发生纵裂的原因;研究发生纵裂后,对电杆结构使用的影响;有的单位已经研究出了发生纵裂后的补救措施。这些研究对发展和推广预应力
I. INTRODUCTION Recently, the phenomenon of longitudinal cracking of annular prestressed concrete poles used in high voltage transmission lines throughout the country is quite common. It directly threatens the safe and reliable operation of the power grid, and has attracted the attention of relevant departments and line workers. Nowadays, many organizations are exploring and studying the causes of the occurrence of longitudinal cracks; studying the effects of the occurrence of longitudinal cracks on the use of pole structures; and some units have already studied the remedial measures after the occurrence of longitudinal cracks. These studies develop and promote prestressing