Research On The Key Technology Of Self-climbing Pole Tower For UHV Transmission Line

Holding poles,as a hoisting tool,are widely used in the construction of Ultra High Voltage(UHV)transmission line towers.With the increasing requirements for line tower construction,the problems of the poles used in current construction of UHV transmission lines are gradually exposed.In the recent construction of UHV transmission line towers,safety accidents frequently occur due to structural instability and other problems.Seating-type rocker arm holding poles,which are developed to replace the guyed suspended ones,also have drawbacks in terms of self-weight,transportation and assembly.In order to solve these problems,research on construction scheme of the tower is conducted and a novel internal climbing pole is proposed in this paper.The main research is as follows:1.Read relevant literature in the field of tower construction and tower holding pole at home and abroad.The construction and application of UHV tower were summarized.2.In view of the problems existing in the construction of UHV transmission line tower groups at home and abroad,such as obvious construction safety risks,non-standard operation in the process of tower groups,and basic dependence on manpower and workers’ experience in construction,four construction schemes of UHV transmission line tower groups were proposed.On the other hand,the scheme design and mechanical analysis were carried out respectively.Finally,the traditional UHV tower formation method was compared with the four tower formation methods proposed in this paper,and the results show that the inner climbing pole tower is suitable for the UHV transmission line tower formation.3.JC27151 CG linear tower,which was widely used in Yazhong-Jiangxi ±800k V UHVDC transmission project,was taken as the construction object.The climbing process of self-climbing lever was put forward.The equipment and layout specification used in the construction of self-climbing pole group tower were summarized.The transport of the tower materials and the sequence of the self-climbing derrick assembly JC27151 CG iron tower were stipulated.Finally,the construction flow of the tower group was put forward.4.Finite element analysis was carried out on the self-climbing lever proposed in this paper.Firstly,the optimization calculation of the section size of the derrick was carried out,then the wind load calculation and lifting weight calculation of the self-climbing derrick were carried out under 6 working conditions and non-working conditions.Secondly,the self-climbing derrick model was simplified,and then the finite element model of the self-climbing derrick was established by using beam element and rod element in Workbench.The static analysis and modal analysis results of the self-climbing lever under 6 working conditions were obtained by applying the force of the lever under 6 working conditions to the finite element model one by one.