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一、坡长限制是农村道路重要技术指标农村道路是公社间或集镇间的交通运输道路。这类道路尤其是黄河以北地区,均以通行非机动车为主,其动力主要是畜力。畜力动力的特点是: 第一,动力连续使用时间有一定限制。如马的连续役使时间不准超过3～4小时,使用3～4小时以后就需要休息。同时在休息前后,动力性能有较大差别。据试验,同一情况下,休息后可上10％的坡度;休息前上6～7％的坡度还感到非常困难。第二,各种动力数值具有一定的持续时间。据试验结果分析,牛马骡驴发挥体重50％的拉力只能持续
First, the slope length limit is an important technical indicator of rural roads Rural roads are communes or road between the town of transport. Such roads, especially the area north of the Yellow River, are dominated by non-motorized vehicles and their main driving force is animal power. Animal power is characterized by: First, the continuous use of power have some restrictions. If the horse’s continuous service so that the time allowed for more than 3 to 4 hours, the use of 3 to 4 hours after the need to rest. At the same time before and after the break, the dynamic performance is quite different. According to the test, under the same circumstances, the rest can be up to 10% of the slope; before resting on the slope of 6 to 7% is still very difficult. Second, all kinds of dynamic values have a certain duration. According to the test results, the mule and donkey exert a weight of 50% of the tension can only be sustained