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十五年来,美国物价盘旋上升。但是,由于工程机械上不断采用新机械和新技术,土方成本基本稳定;假设1948年每码~3土的成本平均为48分美元,至目前只增加了3分美元。自铲式铲运机向高产量尺寸发展。自铲式铲运机能到达任何工区,并铲运任何土料的时候,已经为期不远了。在土方和石方工程中,采用自铲式铲动机的比例越来越大,其斗容量也在增大。在良好的工作条件下,它们铲运的每码~3土,价钱比一般铲运机低几分美元。
In the past 15 years, prices in the United States have spiraled up. However, due to the continuous use of new machinery and new technologies on construction machinery, the cost of earthwork is basically stable; assuming an average cost of 48 cents per yard in 1948, it has only increased by 3 cents. Self-propelled scrapers develop to high output sizes. It is not long before the self-propelled scraper can reach any work area and shovel any earth. In earthwork and stonework, the proportion of self-spade shovel motives is increasing, and their bucket capacity is also increasing. Under good working conditions, they shovel every yard of soil ~ 3, the price is a few cents lower than the average scraper.