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随着电气化铁路建设的发展,对接触网支柱的使用要求相应提高。当采用AT供电方式、3吨系列重型链形悬挂及接触网与10千伏高压电力线同杆架设等有别于以往各电气化铁路的情况时,支柱弯矩约需增加2～3吨·米,长度约需增加3～4米。因而已有电气化铁路使用的横腹杆工字形断面预应力混凝土支柱难以满足弯矩和长度增加的要求。为此决定使用环形等径预应力混凝土接触网支柱来适应变化的情况。表1是设计任务书中提出的主要技术条件。
With the development of electrified railway construction, the use of contact network pillars has been correspondingly increased. When the AT power supply mode, 3-ton series of heavy chain suspension and contact nets, and 10 kV high-voltage power lines are erected on the same pole, the pillar bending moment needs to be increased by about 2 to 3 tons of meters. The length needs to be increased by 3 to 4 meters. Therefore, it has been difficult to meet the requirements of increasing bending moments and lengths for pre-stressed concrete pillars with I-sections of horizontal cross-sections that have been used in electrified railways. For this reason it was decided to use an annular equal-diameter prestressed concrete catenary support to adapt to changing conditions. Table 1 is the main technical conditions proposed in the design task book.