美国的架空索道集材按索系大致可分成固定式、松紧式及回空承载式三种。固定式索道虽在欧洲受到欢迎,但在美国由于其架设和拆转成本高已日趋减少。目前应用较多的是以带钢架杆自行式绞盘机为动力的回空承载式索道。其优点是吸引范围呈矩形而不是扇形;既可用于皆伐作业也可用于择伐作业;若配备带 The United States ropeway skidding by cable system can be roughly divided into fixed, elastic and back-air bearing three. Although fixed ropeways are popular in Europe, they have been declining in the United States due to their high cost of erection and demolition. At present, more applications are based on the self-winch with steel rod rack-powered carrier-type air rope back rope. The advantage is that the attraction range is rectangular instead of sector; it can be used for both clear-cutting and selective-cutting;