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输电线路大跨越钢管塔的结构规模较大时,钢管的局部稳定是设计中的难题,径厚比限值的规定是对此问题的具体要求。为符合规定,设计中通常需增大钢管壁厚,从而产生厚板加工困难、层状撕裂、单件质量过大以及经济指标不理想等问题。在舟山370m高塔的设计中,对大尺寸钢管采用了钢管混凝土构件,从根本上解决了上述问题。此类复合构件中,混凝土约束了钢管的变形,防止钢管过早发生屈曲;而钢管的限制又可以避免混凝土过早开裂。采用钢管混凝土构件,大大地减少了钢材的耗量,经济效益较好。因此,对于工程地质条件较好的情况,输电线路大跨越钢管塔的主材采用钢管混凝土构件是一个比较合理的方案。
When the structure of large-span transmission line spanning steel pipe tower is large, the local stability of the steel pipe is a difficult problem in design. The requirement of diameter-to-thickness ratio limit is the specific requirement for this problem. In order to meet the requirements, the design usually requires increasing the wall thickness of the steel pipe, resulting in problems such as difficult plate processing, layered tearing, excessive single piece quality and poor economic indicators. In the design of Zhoushan 370m high-rise tower, a steel-pipe concrete member is adopted for the large-size steel pipe, which fundamentally solves the above problems. In such composite structures, the concrete restrains the deformation of the steel pipe to prevent the premature buckling of the steel pipe, and the restriction of the steel pipe can prevent the premature cracking of the concrete. The use of concrete-filled steel pipe components, greatly reducing the consumption of steel, good economic returns. Therefore, for engineering geological conditions is better, the main line of the transmission line spanning steel pipe tower using concrete-filled steel tube is a more reasonable solution.