以往的集材索道均是采用一根钢索来作为承载索(亦称主索),因此生产中应随时考虑荷载量对主索安全强度的影响。近来,由于从资源的利用和经济的角度出发,长材的需求量不断增加,而大载量又是现行索道设施所无法承受的。为此,高知林业株式会社研制出采用两根钢素上下并行作为主索的集材索道,并研制出其配 In the past, the tightrope tramway used a steel cable as the carrier cable (also known as the main cable). Therefore, the impact of the load on the safety strength of the main cable should be taken into consideration in production. Recently, the demand for long products has been increasing due to the utilization of resources and economy, and the large load is unbearable by the existing cableway facilities. To this end, Kochi forestry Co., Ltd. developed using two steel up and down parallel as the main cable lumber rope, and developed its distribution