Search for rational solutions for the repair and rehabilitation of shallow sewers

A significant part of the sewers of Kharkiv wastewater disposal networks pass through areas where there are no traffic flows or pedestrian arteries. The sewers have a diameter of 300 to 1400 mm and are laid at a depth of 3 to 8 m. A significant part of them is disrupted due to gas corrosion. This primarily the case for the vault section of the sewers. The invert elements that are permanently filled with wastewater usually remain intact. Polyethylene and fiberglass pipes are used for repair and rehabilitation of such sewers. The disadvantage of these pipes is their high cost, and the fact that when installed in the damaged invert section of the sewer, this results in the reduction of the cross-section of the newly created pipeline. The use of pneumatic and inventory formwork allows creating a new ovoid-shaped sewer, the cross-sectional area of which significantly exceeds the existing one. The retained invert is used as the main load-bearing element. Prior to repair and rehabilitation work, both the geometrical parameters and the load-bearing capacity of the retained invert section are determined, which, in the future, will allow making a decision on creating a new ovoid-shaped and ovoid-section sewer on its basis. Creating an ovoid cross-section makes it possible to increase the capacity of the sewer and significantly reduce the cost of repair and rehabilitation work compared to the use of polyethylene and fiberglass pipes.