The Saluda Dam Remediation Project in Lexington, South Carolina, was the largest active dam project in the United States during its three-year construction schedule from August 2002 through September 2005. As is typical in most earthen dams, the design called for a double chimney filter zone surrounding the core material of the dam. Saluda's design had both an upstream and a downstream double filter system. The upstream system consisted of a four-foot zone of 3/8-inch sand "fine filter" and a four-foot zone of one-inch minus gravel "coarse filter," while the downstream filters were six feet each of the same products. Filter zones have proven to be one of the primary challenges in dam construction. The contractor must weigh out production needs against the waste/overbuild typically generated when dealing with filter zones. Several methods have been used with limited success on past projects, including bedding boxes, belly dumps, and front-end loaders. The method designed, tested, and patented at the Saluda Dam project eliminated the typical concerns with production, contamination, and breakdown of the filters. The patent for the process covers the entire system, starting with the modified 740 ejector and ending with the spreading of the filters with the modified dozer. Barnard Construction Company Inc. developed and patented a method of using a modified Cat 740 ejector truck to place the filters. The truck modifications included adding a steel divider, a "beaver slide" which is a steel chute that directs the material fill location, and a modified tailgate system. The process also involved using a smaller dozer equipped with a divided box to keep the material separated while being spread. The 740s were loaded with both the coarse and fine filters directly from the material stockpiles and then they hauled the materials to the embankment location. The trucks would generally use the center core material as a haul road to limit the amount of traffic on the filters. Once in the placement locations, the 740s would straddle the filter zones and begin discharging by ejecting the filters down the "beaver slides." The depth of the filter zones would be controlled by the truck speed and RPM monitored by the driver, who also received feedback from a dozer operator following behind the truck.
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机译：在2002年8月至2005年9月的三年建设计划中，南卡罗来纳州列克星敦的Saluda大坝修复项目是美国最大的在建大坝项目。与大多数土坝一样，该设计要求使用双烟囱。围绕大坝核心材料的过滤区。 Saluda的设计同时具有上游和下游双重过滤器系统。上游系统由一个4英尺长的3/8英寸砂“细过滤器”和一个4英尺长的一英寸负碎石“粗过滤器”组成，而下游过滤器每个都是6英尺。 。过滤区已被证明是大坝建设的主要挑战之一。承包商必须权衡生产需求和处理过滤区域时通常产生的浪费/过度建设。在过去的项目中，已使用了几种方法，但收效甚微，其中包括床上用品箱，垃圾堆和前端装载机。 Saluda大坝项目设计，测试并获得专利的方法消除了过滤器生产，污染和故障的典型问题。该工艺的专利涵盖了整个系统，从改进的740喷射器开始，到滤清器通过改进的推土机展开为止。巴纳德建筑公司（Barnard Construction Company Inc.）开发并申请了一种使用改良的Cat 740顶出卡车放置过滤器的方法并申请了专利。卡车的修改包括添加钢制分隔板，“海狸滑梯”（一种用于指示物料填充位置的钢溜槽）以及改进的后挡板系统。该过程还涉及使用配备有分隔箱的较小的推土机，以使物料在撒播时保持分离。 740s直接从物料堆中装载了粗滤器和细滤器，然后将物料拖到路堤位置。卡车通常将中心核心材料用作运输道路，以限制过滤器上的交通量。一旦进入放置位置，740s将跨过过滤器区域，并通过将过滤器向“海狸滑梯”下方弹出来开始排放。过滤区域的深度将由卡车速度和驾驶员监控的RPM控制，驾驶员还从卡车后面的推土机操作员那里收到反馈。
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