架空线路用货运索道承载索数值模拟分析

Numerical Simulation Analysis of Load Cable for Cargo Cableway of Overhead Line

架空输电线路施工专用货运索道多用于高山大岭、地形起伏较大的地区,因此索道架设时承载索的断面参数和张力复杂多变。计算索道承载索荷载后断面参数及张力的变化,该结果对提高货运索道的安全性和经济性具有重要意义。当承载索的跨距足够大时,将连续索道的承载索简化为多跨的悬链线方程组,并假定各索道支架处承载索支点摩阻系数为0,利用Excel的规划求解工具,将各跨水平张力和荷载点高程设置为可变单元格,以各跨支点处张力平衡、空载和荷载时线长平衡及荷载点处荷重与承载索张力的垂直分量平衡为约束条件,快速求解各未知量,从而得出索道承载索断面参数及张力的变化。该模型的计算结果与实测记录相吻合,适用于施工现场的实际应用。

The cargo cableway for overhead transmission line is usually used in high mountains and region with great topographic relief.So the parameters and tensions of load cable sections are usually quite complicated and changeable during the installation of cargo cableway.The calculation of the parameters and tensions of load cable with load has important significance to the improvement of the safety and economy of cargo cableway.When the span of the load cable was large enough,the continuous load cable could be simplified to multi-span catenary equations set,and the fulcrum friction coefficient of load cable of cargo cableway could be assumed as zero.Then the level tensions and loading point elevations in every span was set as adjustable cells with using the Programming Function of Microsoft Excel.Based on the constraint conditions：tension-balance in each span fulcrum,line length balance with load and non-load,balance between vertical component of bearing cable tension and total load in loading point,the changes of the parameters and tensions of load cable sections were calculated rapidly.The model,whose calculation results are identical with the actual measured data,can be applied for practical constructions.