1000kV特高压新型钢管及角钢混合塔的设计研究

Due to the significant superiority of steel pipe towers, the 1000 kV UHV double-circuit power transmission and transformation projects in China basically adopt the structure of steel pipe towers. However, the processing technology of steel pipe towers is complex, the quality requirements are high, and the construction is difficult. Despite the adoption of standardized design, the production capacity of steel pipe towers still hardly meets the demand. Taking the Anhui-East Power Transmission Project as an example, referring to the design conditions of UHV steel pipe towers, a new type of steel pipe and angle steel hybrid tower has been planned and designed, and all the members above the lower cross arm are made of angle steel materials; the transition joints at the section where the main material of the tower body changes from steel pipe to angle steel have been optimized in design, the dynamic characteristics of the two tower types, namely the steel pipe tower and the hybrid tower, have been compared, and the analysis of economic indicators has been carried out. On the premise of ensuring safe operation, the feasibility of the new type of hybrid tower has been demonstrated, which greatly increases the proportion of angle steel in the members and correspondingly reduces the proportion of steel pipe, effectively alleviating the problem of insufficient production capacity of steel pipes used in transmission towers.

由于钢管塔优越性显著,中国1 000 kV特高压双回输变电工程基本采用钢管塔结构。然而钢管塔加工工艺复杂、质量要求高、施工难度大,尽管已经采用标准化设计,钢管塔的产能仍很难满足需要。以皖电东送工程为例,参考特高压钢管塔的设计条件,规划设计了新型钢管及角钢混合塔,下横担以上杆件全部采用角钢材料;优化设计了塔身主材钢管变角钢截面处的过渡节点,比较了钢管塔和混合塔2种塔型的动力特性,并开展了经济指标的分析。在保证安全运行的前提下,论证了新型混合塔的可行性,使得杆件中角钢比例大幅增加,钢管比例相应减少,有效缓解钢管应用于输电塔产能不足的问题。