АНАЛИЗ СОСТОЯНИЯ ЖЕЛЕЗОБЕТОННЫХ ВОДООТВОДЯЩИХ СЕТЕЙ В ГОРОДЕ УФЕ И ИХ ВЛИЯНИЕ НА ОКРУЖАЮЩУЮ СРЕДУ

Minimizing the negative impact on the environment is a priority in the operation of wastewater drainage networks. Currently, hundreds of kilometers of reinforced concrete underground drainage tunnels and pipelines are in use across the country. While they offer numerous advantages, they also have a significant drawback: low resistance to gas-induced corrosion, which substantially reduces their intended service life. Consequently, a primary objective for the organizations that manage these systems is to ensure the reliable and long-term performance of existing networks. This article examines the technical condition of reinforced concrete wastewater pipelines in the city of Ufa and their environmental impact. The city’s drainage networks are prone to rapid and often unpredictable deterioration caused by hydrogen sulfide and carbon-based corrosion of the concrete - a process driven by aggressive gases that accumulate above the surface of the wastewater. This significantly shortens the lifespan of the infrastructure and frequently leads to emergency situations. At present, the centralized wastewater system lacks reliability; there is a high risk of collector pipe ruptures and the accidental discharge of untreated sewage into water bodies. In recent years, only 1.48–2.53 km of worn-out pipelines in Ufa—representing just 1.4–2.5 % of the total urban sewer network—have been restored through various types of repairs. To avert an environmental catastrophe, it is essential to ensure that at least 5 % of the total network length is replaced annually.To guarantee reliability and prevent emergency incidents, the wastewater drainage networks must be modernized. This requires the implementation of contemporary replacement and rehabilitation methods — specifically, «non-destructive» technologies and the use of pipes made from corrosion-resistant, long-lasting polymeric materials. In densely built-up urban areas, the most effective and economical methods for repairing and rehabilitating pipelines are trenchless techniques. These rely on «non-destructive» technologies and the use of pipes made from corrosion-resistant, long-service-life polymeric materials, making it possible to restore worn-out pipelines to operation and ensure a stable flow capacity for 50 years or more.