![]() Subsequently, HDD and open-cut were deemed the remaining options. The trenchless pipe replacement option was eliminated as a result of concerns with bursting existing asbestos cement pipe. The City initially explored trenchless pipe replacement, Horizontal Directional Drilling (HDD), and traditional open-cut as possible construction options. For water utilities, sustainability is about creating reliable, consistent infrastructure that can be managed, maintained and upgraded without destroying the environment or bankrupting users. In keeping with principles of sustainable infrastructure development, preference was given to replacement practices that would make the water infrastructure adhere to social, environmental and economic pillars of sustainability. The existing pipes were installed between 19 and had far exceeded their 50-year design life. The Downtown Waterline Replacement project involved replacing their aging 4-inch (100 mm) and 6-inch (150 mm) asbestos cement drinking waterlines with 6-inch (150 mm) PVC pipes. The City’s Engineering Department engaged in a project to replace an aging asbestos cement drinking water system in the downtown area in February 2016. Located in the southwestern corner of Arizona bordering California, Yuma (population 93,000) serves as a halfway point between Phoenix, AZ and San Diego, CA. HDD has proven to be superior to open-cut construction in environmental, traffic control and productivity. This translates to HDD achieving a production rate greater than four times that of open-cut.Ĭonclusions: The adoption of trenchless technologies such as HDD will continue to increase as municipalities turn to sustainable solutions for replacing and/or rehabilitating their existing water pipe line infrastructure. HDD achieved an average productivity of 1.91 L.F./min (0.58 m/min) compared to traditional open-cut, which achieved an average productivity of 0.43 L.F./min (0.13 m/min). Traffic was restricted in the sections involving open-cut construction, while the HDD sections had continuous traffic flow due to the closure of only one lane. ![]() The HDD option emitted approximately 23% of airborne emissions compared to open cut. Results: The results found HDD to have inherent advantages in all three areas when compared to traditional open-cut. Data was collected in the field over a two-month period with factors analyzed including comparison of: (1) environmental impacts (2) traffic impacts and (3) productivity. PVC C900 DR18 was installed using open-cut, while Fusible PVC (FPVC) DR18 was installed by HDD. Analyzing the same project provided an opportunity to study a true head-to-head comparison of the two methods. Methods: To study advantages and disadvantages of traditional open-cut construction compared to Horizontal Directional Drilling (HDD), the City separated the project into approximately 2000 L.F. Installed between 19, six line segments of existing 2-inch (50 mm) to 6-inch (150 mm) asbestos cement water lines were replaced by 6-inch (150 mm) diameter PVC pipe. ![]() (1767 m) of existing aging and undersized asbestos cement water lines in the vicinity of the downtown core to reduce maintenance and repairs and improve water service levels. Background: Due to deterioration from aging, the City of Yuma, Arizona undertook the replacement of approximately 5800 L.F.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |