Ensuring the reliable operation of sewerage systems is one of the essential tasks of municipal services in Ukrainian cities. As the research shows, in most cases, their construction involved concrete and reinforced concrete, which are prone to destruction under the influence of many factors, particularly microbiological corrosion. The destruction of sewage collectors is often the reason for wastewater leaking into groundwater and soil, resulting in pollution. The article provides statistical data on the ‘Kharkivvodovidvedennia’ Complex of the ME ‘Kharkivvodokanal’ as of 01.01.2024, which operates the city’s external water drainage networks. The article outlines the most common factors that lead to emergencies in sewage networks, such as aging and wear of infrastructure, insufficient maintenance and repair, mechanical damage, pollution and clogging, increased volume of wastewater, planning problems, chemical reactions, biological corrosion, and connection defects. The relationship between these causes may be that corrosion can weaken pipeline materials, making them more vulnerable to mechanical damage and leakage. According to preliminary calculations, it is necessary to relay or rehabilitate (trenchless pipeline laying) at least 22–25 km of city networks annually to ensure the reliability of sewage networks. The article analyses the work cycles performed on the tunnel collectors’ objects and large-diameter collectors over five years. Major repair and reconstruction work that deserves attention includes work on the repair of mine No. 12 of the tunnel collector of the 761 micro-district (mine depth H = 6.75 m, diameter – 5 m); restoration work of the Oleksiivskyi collector Ø 2000 mm near the viewing chamber No. 33 on the street Lopanska; restoration of the collector of the Northern group of factories Ø 900 mm at Danylivskyi Uzviz. As a result, we carried out an analysis of the current state of the sewage network of the city of Kharkiv. The main factor in the wear and tear of sewerage networks is corrosion, which, in turn, can weaken pipeline materials, making them more vulnerable to mechanical damage and leaks. Despite the difficult economic conditions, work on the repair and operation of networks is carried out. Also worthy of special attention for future research is the survey of mines where restoration work took place over the past ten years using modern methods.
Keywords: underground construction, sewerage, renewal, repair, reconstruction, bearing capacity, wear, corrosion.
