摘要
GSSZ2窄基钢管塔是河北南网第一基220\110kV四回路钢管塔真型试验,根开5.072m,塔高78.7m,重量38.7t,依照《架空线路杆塔结构荷载试验》DL/T899-2004开展试验,分别进行了大风、锚线、断线等7个工况试验。试验表明:GSSZ2塔的位移测试结果满足相关规范的变形要求;应变测试结果基本与计算相符,没有超构件承载力,验证了窄基钢管塔的设计是安全可靠的;试验还验证了锻造法兰在220kV窄基钢管塔中能有效的传力,由于其能降低焊接工作量和提高加工效率等优点,建议以后常规电压等级钢管塔设计中,在法兰厂家生产能满足供货需求的前提下,可推广应用;GSSZ2塔主材采用钢管,横担以及其它斜材采用角钢,角钢与钢管通过节点板连接,试验验证安全可靠。因窄基塔跟开小,塔身宽度小,在单侧断线工况下,扭转位移较大,应合理设置隔面,提高窄基钢管塔抗扭刚度。
The GSSZ2 tubular steel tower with narrow foundations is the first full-scale test tower for 220／110kV four- circuit line in South Hebei. The tower with root 5.072m, height78.Tm and weight 38.7t, was subjected to tests under seven operation conditions including wind, anchor-wire, broken wire, which were conducted according to the standard DL/T899 -2004 ”Loading Tests on Tower and Pole Structures of Overhead Line”. The Experiments show that the displacement and stress of tower GSSZ2 meet the relevant standard of deformation and member＇ s carrying capacity respectively, and the tower is safe and reliable. The test also verifies the forging flange in tubular steel tower with narrow foundation for 220kV line can transfer loads and forces effectively. Because it can reduce the welding workload and improve processing efficiency, the use of forging flange is recommended and promoted in conventional voltage tubular steel tower design when flange manufacturers can meet the supply demand. Main Component of GSSZ2 is steel tube, while cross arm and other cable is angle steel, with gusset plate connection between angle and tube which is proved safe in the test. Because the foundation distance and tower width of the tower is small, in unilateral disconnection condition, torsional displacement is relatively large. Cross panel should be appropriately set to improve the torsional stiffness of tubular steel tower with narrow foundation.
出处
《电力勘测设计》
2014年第2期50-55,共6页
Electric Power Survey & Design
关键词
输电线路
四回路
窄基钢管塔
锻造法兰
真型试验
transmission lines
four circuits
tubular steel tower with narrow foundations
forged steel flanges
full-scale test.
