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一、电杆与底座的结构改进在苏联交通建筑中广泛用于接触电线网、通讯信号装置和输电线路中的电杆是离心成型的锥形预应力电杆。改进这些电杆的结构(主要是变化普通钢筋和预应力钢筋的数量和位置)和提高混凝土的标号,用以提高抗裂性,避免纵向裂缝等。对离心电杆的结构进行了以下改进:减小纵向钢筋的控制应力和增加横向钢筋(螺旋筋间距由75毫米减小到60毫米);电杆下部附加8根非预应力钢筋;为保持电杆内部温度的平衡,在电杆壁上设置8对通风孔,
1. Structural improvement of poles and bases. The poles used extensively in Soviet traffic buildings for contact with wire nets, communication signalling devices and transmission lines are centrifugally formed conical prestressed poles. Improve the structure of these poles (mainly by changing the number and position of ordinary steel bars and prestressed bars) and increase the number of concrete to improve crack resistance and avoid longitudinal cracks. The following improvements have been made to the structure of the centrifugal pole: reducing the control stress of the longitudinal reinforcement and increasing the transverse reinforcement (the distance of the spiral reinforcement is reduced from 75 mm to 60 mm); 8 non-prestressed steel bars are attached to the lower part of the pole; Balance the internal temperature of the rod and set 8 pairs of ventilation holes on the rod wall.