1 000 kV特高压新型钢管及角钢混合塔的设计研究

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。

Design and Research on Hybrid Steel Tube and Angle Steel Tower for 1 000 kV UHV Transmission Line

Almost all the towers of 1 000 kV UHV double-circuit transmission line in China used steel tube towers because of steel tube tower's obvious advantages against an angle steel tower. However, a steel tube tower requires complex manufacturing process and high quality control, and is difficult to construct. Even after a standardized design being adopted, the output of steel tube towers remains being challenged in meeting the increasing demand for large transmission towers. The paper presents a new plan and design of a hybrid tower with both steel tube and angle steel that meets the design conditions of the UHV steel tube tower for Anhui Electricity to East transmission project. The angle steel is used for all members above the lower cross arm with the rest of the hybrid tower using steel tube. The paper optimizes the transition node between the angle steel and the steel tube of the tower body, compares the dynamic characteristics between the hybrid tower and the steel tube tower, and conducts economic analysis on key economic parameters. The paper demonstrates the feasibility of using the new type hybrid tower to meet safe and stable operation of the transmission line, which significantly increases the proportion of angle steel used in the tower with corresponding reduction in the use of the steel tube, therefore effectively addresses the issue of insufficient output.