超/特高压交流同塔四回钢管塔设计及试验

Design and full-scale test for steel tubular tower of UHV and EHV quadruple-circuit transmission line on the same tower

双回1 000 kV与双回500 kV同塔并架四回路SSZT2塔,是我国乃至世界上迄今为止应用于一般线路工程的单塔输送容量最大、高度最高、荷载最大的输电钢管塔。钢管最高材质为Q420,钢管全部采用插板和锻造法兰联接,首次应用强度级差高颈锻造法兰;在SSZT2杆塔结构设计中,对杆塔结构型式、风振系数、埃菲尔效应、钢管构件杆端弯矩等进行了专项研究,完善了超/特高压同塔多回钢管塔的设计,并通过了真型试验。试验表明我国超/特高压同塔多回钢管塔在设计、加工等环节有了可靠保障,可在特高压工程中进一步应用。

The SSZT2 tower,on which 1 000 kV AC double-circuit and 500 kV AC double-circuit are arranged,is the highest steel tubular tower with the biggest load and largest transmission capacity within conventional lines all over the world.The tube is made from Q420 high-strength steel and connected by plug-in boards and forging flanges.The strength classification technical is applied in forging flanges for the first time.The design of multi-circuit steel tubular tower for UHV and EHV is improved through different aspects of studies including tower structure,wind vibration coefficient,Eiffel effect and bending moment.The success of full-scale test verified the reliability in design and manufacture of multi-circuit steel tubular tower for UHV and EHV which can be used in future projects.