Akademik Veri Yönetim Sistemi
Next Generation Economics: Challenges and Perspectives, Baku, Azerbaycan, 04 Ekim 2024, ss.332-339, (Tam Metin Bildiri)
Population and cities are consistently growing in our world, and as a result, the need for drinking and potable water is increasing. On the other hand, another important fact is the aging and deterioration of city infrastructure systems. Constant fractures, collapses and blockages in old water pipes have reached disturbing dimensions. Regardless of the type of pipe, various damages occur in underground pipelines due to mechanical external factors, soil movements, corrosive environment, faulty pipe joints. To prevent water scarcity, pipe maintenance and repair operations must be provided by water administrations periodically. This can be carried out with or without excavation on buried pipes. Excavation, while being a considerable expense, is impossible due to many interferences with transportation lines, historical sites and residential areas in some cases. So, maintenance and repair operations without excavation, trenchless technologies, are needed. These are divided into two categories such as trenchless construction and renewal technologies. In cases where it is impossible to neither maintain nor repair an old pipeline, trenchless construction is required. It can be done by using pipe jacking or earth boring methods. In cases where repair is possible, trenchless renewal methods such as slip lining or close-fitting methods can be feasible or even obligatory. Each method has a different cost range depending on factors such as material accessibility, material value and construction equipment costs. Istanbul Water and Sewage Administration have been using a wide variety of these methods for last 25 years. Hence the accessibility to material and construction equipment used specifically for these methods are increasing in Istanbul. Pipelines in a water distribution network can also get damaged during or after an earthquake due to the factors such as soil liquefication and sudden ground shaking. Due to damage being done, water scarcity may occur in earthquake areas. In this paper, the trenchless technologies are evaluated from an economic point of view for Istanbul with respect to the risk of an earthquake which is expected to happen in the region soon.