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用计算尺计算土方只能得到三位数值,一般认为不精确。是否精确呢?我们来分析一下: 所谓土方是指的体积等于长、宽、高的乘积,都是实际测算得来的,通常是测算到公分为止;也就是说,长、宽、高的准确性只能到公分。一般情形,中心填土高度或挖土深度很少有超过10公尺的,所以土方的高度常有三位可靠数字,宽度有三位或四位可靠数字,长度有四位或五位可靠数字。例如中心填土高度=1.10公尺,路基宽度=8.50公尺,边坡比=1:1.5,横断面相邻两椿的距离为20.00公尺,并假设相邻两椿的横断面图均相同,则两椿间的土方V=1/2×(8.50+11.80)×1.10×20.00 从上式看来,长、宽、高只能准确到公分,第三位小数又不知道,所以以“?”来表示第三位小数进行演算,即V=20.30?×1.10?×10.00?=223公方, 上例可以看出,虽然长和宽都有四位可靠数字,
Calculating earthwork with a slide rule can only result in three digits, which is generally considered inaccurate. Is it accurate? Let us analyze: The so-called earth is the volume equal to the length, width, height of the product, are actually measured, usually measured until the centimeter; that is, long, wide, high accuracy Sex can only go to the centimeters. In general, there are very few earth fill levels or excavation depths of more than 10 meters. Therefore, there are often three reliable figures for earthwork, three or four digits of width, and four or five digits of length. For example, the center fill height = 1.10 meters, the subgrade width = 8.50 meters, the slope ratio = 1: 1.5, the distance between two adjacent traverses is 20.00 meters, and assuming that the cross sections of two adjacent trays are the same , Then the earthwork between two piles V = 1/2 × (8.50 + 11.80) × 1.10 × 20.00 From the above equation, the length, width and height can only be accurate to the centimeter, the third decimals do not know, so the “ ? ”To represent the third decimal place to calculate, namely V = 20.30? 1.10? × 10.00? = 223 square, the above example can be seen, although the length and width have four reliable figures,