送電用中空鋼管鉄塔の耐風補強工法の開発 : 既設鉄塔の現場補強方法

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A frequent big typhoon drew our attention to some reinforcement measures from a new point of view for steel-tube transmission towers. Conventional reinforcement methods of the steel-tube towers are member replacing, concrete filling into a member, or on-site welding of an additional member, etc. Economically, however, these methods are disadvantageous because not only large-scale construction equipment is needed but also elaborate execution of construction and quality control are required at the site located under a geographically severe condition such as a mountainous area. This paper introduces two reinforcement methods we have developed from a new perspective: one is "parallel member attaching method" in which reinforcement materials utilizing high rigidity of flange joints of the steel-tube main post are attached to the transmission tower, and the other is "redundant member adding method" which can be useful in the main post near cross-arms. These methods, without a need for on-site welding and material processing, enables quick assembly. As a result, the construction can take significantly short time compared with the conventional methods. The authors have studied some reinforcement effects of these new methods by the compression test of actual models. And it has been found that most of the ultimate strength can be estimated by a nonlinear three dimensional analysis using FEM software. In addition, with regard to the impact on dynamic characteristics of the steel tower, we have conducted a comparative study of vibration test before and after the reinforcement was applied. Based on the results, the reinforcement effects on the vibration modes and the damping characteristics of the towers were confirmed.
一般社団法人日本建築学会の論文
2003-03-20

送電用中空鋼管鉄塔の耐風補強工法の開発 : 既設鉄塔の現場補強方法

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