For excavation projects requiring manned entry, shielding and shoring trench walls is a major cost. Material and labor prices escalate as excavations cover more area and become deeper. On many large projects -- especially long runs of large-diameter pipe installation -- slide rail systems have become the preferred method of preventing the collapse of trench walls.
Electrical cable for power distribution systems has been placed underground for decades. In fact, it would be unusual today to even consider installing aerial power or communications cable in a new residential development, office park, government or institutional campus.
Charles Stringer, assistant director of Water Operations for the Dallas Water Utilities, Dallas, TX, did double duty when he delivered presentations at two chapter meetings for the Underground Construction Technology Association (UCTA). Attendees at the Gulf Coast Chapter meeting held in Houston on Oct. 12 and those who attended the new North Texas Chapter meeting in Euless, TX, on Oct. 14 had the opportunity to hear about the city of Dallas’ recommended 2010 Capital Improvement Plan.
Dewatering is a necessary aspect of many underground construction projects. Construction sites near coastlines, rivers, other bodies of water and in other situations may require 24-hour dewatering every day. Heavy rains may fill work areas during storms.