Pull-behind SCRAPERS AND POWER INITS: Tractor-scraper advocates say these systems save costs on both the front and back end of any earthmoving operation

摘要

As earthmoving systems became increasingly mechanized in the 1930s and '40s, pull-behind mm mkscrapers, usually coupled with dozer power units, were a highly popular and effective way of excavating and transporting large amounts of dirt. Eventually, pull-behind units were supplanted by motorized scrapers. By the 1990s, hydraulic excavator/articulated dump truck teams were considered the state-of-the-art way to quickly move large amounts of earth significant distances. Over the past 20 years or so though, a number of cost-conscious contractors have returned to the old pull-behind scraper concept as their preferred earthmoving system.