Structure Design of Support Frame of Cableway on Car for Emergency Repair

The cableway on car for emergency repair has the characteristics of rapid, efficient and flexible etc., which can meet the requirement of power grid’s emergency repair, this article mainly through force calculation of beam and pillar of support frame, completed the structure design of the support frame of cableway on Car emergency repairs. Introduction Due to overhead transmission lines often through the mountains, the problem of construction transportation largely determines the efficiency of power grid’s emergency repair. Currently the degree of mechanization of overhead transmission lines is not high in our country, in the construction area where the vehicle transportation is inconvenient, often rely on human to transport, while cableway transportation just needs to put up ropes, and we can transport the construction materials and tools to the designated locations from the air directly. Considering the perspective of repair economy, repair efficiency and repair quality, using car cableway transports construction equipment is the most optimal solution. The overall design scheme:Set the end support frame in the mountains and so on which are higher-lying, set the initial support frame in low-lying, flat areas. In order to achieve the efficiency of emergency repairs, the initial support frame is mounted on a car which can move, while the car is configured with a motor-driven winch, providing ample power for traction of the cable, the other end of the cable will be connected to the end support frame, forming a complete lifts. We can use the movable car transport materials between the initial support frame and the end support frame, the total design scheme shown in Figure 1. Fig.1: Cableway on car for power grid’s emergency repair Structure design of the Support frame In order to meet various terrain conditions in the construction site, the height of support frame and length of each pillar can be adjusted flexibly. Thus, the pillar uses standard modular section, and is equipped with the bottom trimming adjustment device. At the construction site, the height of pillar can be adjusted according to the different height of cableway and the undulation of terrain. The method of adjustment include: 1 each pillar of support frame can adjust by adding or reducing 4th International Conference on Computer, Mechatronics, Control and Electronic Engineering (ICCMCEE 2015) © 2015. The authors Published by Atlantis Press 234 the standard section, the minimum length of the standard section is 1m; 2 each pillar of support frame is equipped with length micro-adjustment device, and can slightly adjust height by the bottom adjustment device. Micro-adjustment device is combined with the inside, the outer sleeves, the tightener and the tightener’s shaft, length of the pillar is adjusted by the adjustment device which is connected with the inside, the outer sleeves, and the adjustment device shaft. This solves the problem that the uneven settlement of the pillar may occur during use. the structure of the pillar is shown as Figure 2. 1—base; 2—pins; 3—regulator shaft; 4—tightener; 5—outer sleeve; 6—inner sleeve; 7— top segment; 8— 1m standard section; 9—2m standard section; 10—top beam; 11—drawing board seat; 12—traction rope lug; 13—drawing board top shaft; 14—drawing board; 15—the below shaft of the below drawing plate ; 16—bolts (sets); 17—the wheel of propping the cable. Fig.2 The structure of the pillar Calculation of the pressure of the beam Fig.3 The stress diagram of stent beam The formulas of calculation of the pressure of the beam: N = GG 2 + QQ + �HHtttttt = GG 2 + QQ + (nnHH1tttttt + 2HH2tttttt) GG = GG1 + GG2 + GG3 = nn1llww1 cccccccc + nn2llww2 cccccccc + nn3llww3 cccccccc N—total pressure on the beam, kg. H1—When the payloads locates the middle of the span(for two-span cableway) or the largest middle of the span of the resistant tension section (for multi-span cableway), the maximum level tension of load cable, kg; take H bearing= 993.4kg; H2—the haul cable tension corresponding the maximum level of load cable, kg; H pull = 981.6kg N—the number of carrying cable, when a single cable: n = 1; Q— concentrated load weight (including the weight of accessories and rigging), kg; take Q = 600kg;