Employing the Power of Water, Air, and Vacuum

摘要

Vacuum-excavating systems, whether using high-pressure water or compressed air as the digging medium, have a wide range of application. For example, Bill Petrole, vice president, Vacall, Gradall Industries, tells about a Texas contractor who took on the job of stabilizing pylons under a large building that was beginning to sink. Among the first tasks was excavating material from around the pylons-a delicate operation made more difficult in the close confines under the building. The contractor chose "hydro-excavating"-loosening soil around the pylons with high-pressure water and evacuating the spoil with a powerful vacuum-the vacuum hose stretching long distances to reach some locations.