Study On Mechanical Properties Of □800×40000mm All-steel Holding Pole

With the increasing capacity of power plants, power transmission is gradually characterized longer transmission lines and higher voltage. Most of power-transmission tower were built in mountain and suburban region. Holding pole, which is simple, good stable performance, high efficiency, few machinery equipment, small footprint, economy and security, is a widely used lifting tool.The holding pole, which is a high-rise structure, has a shortcoming of instability. The height of holding pole was increased with the increase of power transmission voltage. The instability of holding pole became more and more serious with its height increased to meet the increased power transmission voltage. There are few research which can be utilized in general projects, most of research results can only be utilized in some specific project. There are several factors which affect the performance of hold-pole, for example, material used, height, length of inter-section, etc. The current study is still not enough.Commissioned by the Shaanxi Transmission and Distribution Company, this paper carried on a load test on a 800×40000mm all-steel holding pole. Holding pole loading test were performed under three kinds of condition and stress, strain and deformation features were measured at each test point. Results show that the hold-pole passed strength, stability and variability test.A 3-dimensional model was constructed by finite element analysis software based on experimental data. Strength, stability and variability data of each test point were computed by the software and compared with the experimental results. Analyzes the mode of holding pole, and obtains basic frequency as well as various steps modality movement form of holding pole and carries on the eigenvalue buckling analysis.Research results show that our proposed holding pole model can meet the requirement of design in strength, stability and variability. But overall structure stability is liable to lost. Stiffness of bracing-wire should be increased in designing and applications to improve stability of hold-pole, this is very important.