Clay County Utility Authority Utilization of Trenchless Water Wastewater Pipeline Installation

摘要

Clay County Utility Authority (CCUA), located outside of Jacksonville, FL has utilized trenchless methods of pipeline installation since the 1990’s. This includes the use of HDD, jacking and boring, slip-lining, pipe pushing and pipe bursting within their potable and reclaim water distribution systems and wastewater force main pipelines. CCUA has gained significant experience with the trenchless technology since its introduction in the county and currently has over fifteen miles installed with no operational issues. Learning gained during some early installation challenges has been applied to establishing best practices for HDD installation that have led to an outstanding installation track record. CCUA continues to experience a growing need for trenchless pipe installation to cross roads, wetlands, waterways, and existing utilities and in some instances avoid expensive restoration associated with traditional open cut. Specific projects illustrate these experiences and cover pipe sizes from 4-inch to 20-inch and HDD bores up to 3,000 LF in length to cross a variety of ground conditions. CCUA design criteria for utilizing trenchless methods and materials illustrate the way in which CCUA has adapted trenchless technologies into their system, including future maintenance and long term material compatibility with specific service applications. This paper will review a variety of projects where CCUA has leveraged the installed cost advantages associated with trenchless technologies. It will also review the lessons learned by CCUA in terms of designing, bidding, applying and installing trenchless methods and materials with their infrastructure projects.