Currently, the existing section of the heating main from TK-181a to TK-193 consists of uninsulated steel pipelines with a diameter of Du 50 to Du 250, supply and return. Pipe fittings for connecting branches and compensators are located in the existing thermal chambers (TC). U-shaped compensators are used to compensate for temperature loads. This work project provides for the replacement of pipelines in the area from the sectioning pipeline fittings to the existing pipeline in TK-181a, to the connection of branches to houses and buildings located connected from TK-193, which includes: replacement of existing pipelines of external heat networks using pipelines pre-insulated with polyurethane foam elements with a conductive steel pipe and an outer shell of polyethylene resistant to atmospheric corrosion (according to DSTU B V.2.5-31:2007); replacement of existing pipelines of district heat networks using flexible pre-heat-insulated reinforced pipes, consisting of three elements that are tightly connected to each other: a conductive pipe, polyurethane foam and an outer shell of PE with a coolant operating temperature of up to 95 ° C and a maximum operating pressure of 1.0 MPa; replacement of existing pipelines in thermal chambers using steel pipes, hot-deformed seamless (according to DSTU 8938:2019); replacement of existing and installation of new shut-off valves, compensators in thermal chambers; thermal insulation of pipelines and valves in thermal chambers; repair and reconstruction of thermal chambers and arrangement of pits; dismantling and arrangement of impassable channel elements (precast concrete trays, if necessary); restoration of road surfaces and sidewalks in places of laying pipelines of external thermal networks; performance of works on landscaping and improvement of the territory of the work. Connection to the existing heating network is made: from the sectionalizing pipeline fittings in TK-181a for branches from the heat chamber to the inner wall of residential buildings and buildings in the pit in front of the installed elevator unit; design boundary for branches of the designed pipelines that are not included in the reconstruction boundary - the wall of the heat chamber. Temperature graph at the connection points 95°-70°C, maximum design pressure in the heating network - P=1.0 MPa. Consumers connected to the designed network belong to the second category in terms of heat supply reliability. The pipelines provided for in this working project are made of: steel electrowelded pipes ST/PE 273x7mm/400, pre-insulated according to the standard DSTU B V.2.5-31:2007; seamless hot-deformed steel pipes according to DSTU 8938: 2019 from steel 20, for diameters from DN 25 to DN 250 mm - in thermal chambers; Connecting parts of pipelines are provided in thermal chambers according to DSTU 17375: 2003, DSTU 17378: 2003 from steel 20. with ductless laying according to DSTU B V.2.5-31:2007. The laying of pipelines is provided underground, in existing brick impassable channels/trays and ductless. At the intersections of the road surface, installation is provided: Petlyakova St. - in the design steel casing 2x DN 500; in other sections of the heat networks passing under the highways, the reverse installation of previously dismantled reinforced concrete slabs of the overlap of the trays as unloading slabs is provided. Compensation of temperature deformations of the steel pipelines of the heat network is carried out by arranging U-shaped compensators. Arrangement of fixed supports in the section of channelless laying from TK-181a to TK-127 is provided using supports for pre-insulated pipelines according to DSTU B V.2.5-31:2007. For the passage of pre-insulated pipelines in the casing, the arrangement of sliding rings is provided, with a step of no more than 3.5 m. In the heat chambers, the replacement of pipelines on branches to consumers is carried out together with the replacement of existing pipeline fittings, including jumpers, air vents and drainage pipes. As shut-off valves, wedge flange and welded die-welded valves are used, for air vents and drainages, wedge flange valves and flange ball valves are provided. The connection of flexible polymer pipes with a steel counterpart in the thermal chamber is provided using end fittings for welding. The arrangement of fixed supports in thermal chambers is provided using clamp supports and serves to fix the pipeline for which a transition to a flexible polymer pipe is provided. All pipelines and shut-off valves located in the thermal chamber must be thermally insulated with mineral wool insulation 60 mm thick with a coating of foiled foamed polyethylene insulation tape. Thermal insulation of pipeline valves is provided as removable. To exclude unauthorized access to thermal chambers, ladders are not provided. For design solutions, see drawings Volume 2 set KTM-26.02 -TM. When performing work: The presence and depth of laying existing underground communications should be clarified during the work. Earthworks at intersections should be carried out manually in the presence of a representative of the operating organization. At intersections of heat networks with highways or roads, lay pipelines by excavating the highway and arranging new impassable channels/cases. In thermal chambers, if necessary, pump out water and clean from debris, with subsequent removal to a landfill. Dismantled trays, floor slabs and dismantled pipelines that are in satisfactory condition should be transferred to KPTM "Kryvorizhteplomerezha". Damaged trays and floor slabs should be disposed of as construction waste with the preparation of appropriate acts. Preliminary and final tests of pipelines should be carried out. The test pressure of the pipelines is 1.25 times the working pressure in accordance with clause 6.3.59 of the "Rules for the technical operation of thermal installations and networks". Installation, testing and insulation of pipelines shall be carried out in accordance with DBN A.3.2-2-2009 "System of occupational safety standards. Occupational health and industrial safety in construction", "Rules for the safe operation of thermomechanical equipment of power plants and thermal networks", "Rules for the technical operation of thermal installations and networks". Before starting work, it is necessary to: open an order for earthworks; disconnect all consumers from the heat network; coordinate the location of the work with all authorities. All existing water supply, sewage and gas pipeline networks that cross the heat network (when it is laid underground in reinforced concrete channels) above the heat network pipelines are arranged in cases 3 m long on both sides from the edge of the building structure of the channel. At the intersections of heat networks with gas pipelines at a distance of no more than 15 m on both sides from the gas pipeline, control tubes are provided on the heat network channel for sampling gas leaks. The project does not allow the discharge of water from pipelines at the lowest points of water heat networks directly into heat chambers. The discharge of water should be carried out from each pipe separately with its pumping by a pump directly into a tanker truck with subsequent removal by a specialized enterprise according to the concluded contracts.
Project cost61'696'716 UAH
Implementation period9 months