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目前,预应力混凝土电杆在国内外已被大量推广使用。除圆锥形电杆外,双肢形电杆由于其技术经济指标先进、杆型美观、登杆检修方便等优点,亦在不少国家广泛采用。因为杆身带孔,可以透过信号,即使在弯道上,火车司机也可看到远方穿射过来的红绿灯,因此,在国内外的电气化铁道上应用更为普遍。陕西省红旗水泥制品厂在我国首次设计试验成功双肢预应力钢弦混凝土电杆。电杆按受力大小分为两类:轻型为甲类,容许弯矩为1.5～2.5(吨-米),长度10～12
At present, prestressed concrete poles have been widely used at home and abroad. In addition to conical poles, double-limb poles are also widely used in many countries due to their advanced technical and economical indicators, beautiful rod shapes, and convenient overhaul of poles. Because the shaft is perforated, signals can be transmitted. Even on curved roads, train drivers can see traffic lights passing through from far away. Therefore, they are more commonly used on electrified railways at home and abroad. For the first time in China, the Hongqi Cement Product Factory in Shaanxi Province has successfully designed and tested two-limb prestressed steel string concrete poles. The poles are divided into two categories according to the size of the force: Lightweight is Class A, the allowable bending moment is 1.5 to 2.5 (ton-meters), and the length is 10 to 12