Structural and space-planning solutions

In accordance with the technical report on the survey of existing structures, the existing building of the boiler house was built in the 19th century according to the wall structural scheme. The category of technical condition is the second. The existing foundations are strip rubble. Foundation laying depth 1,95 ÷ 2,13 m, footing width 500 ÷ 660 mm. At the base of the foundations lie dusty gray dense water-saturated sands with E=280 kg/cm2, φ=34, e=0,55. The technical condition of the foundations is operational. The existing building of the boiler house and the chimney are subject to dismantling, except for the foundations in the area adjacent to the existing building. The level of responsibility of the designed central heating building is normal. The building of the central heating substation was designed according to the frame frame-braced structural scheme. Metal structures are designed from a closed bent profile, steel C 245. External walls are hinged "sandwich" panels 120 mm thick. The covering is designed from sandwich panels 120 mm thick. Panels are mounted to metal structures with self-tapping screws. The rigidity and stability of the supporting frame is ensured by the installation of vertical ties in both directions, horizontal ties of the cover and horizontal ties of the support frame. The relative mark of 0,000 corresponds to the absolute mark of 4.62. The calculation of building structures was performed using the SCAD program version 11.5. The foundation of the central heating substation is a monolithic reinforced concrete slab 200 mm thick made of concrete of class B20, W6, F100. Under the foundations, crushed stone preparation 100 mm thick is provided, bulk soil is replaced with sand preparation up to 2,1 m thick with layer-by-layer compaction. The basis of the foundations are dusty gray dense water-saturated sands. The design resistance of the soil is 1,57 tf/m2, the pressure on the foundation soil does not exceed 0,6 tf/m2. The expected draft of the building is not more than 1,4 m. Parts of buildings fall into the zone of possible influence of the construction of the CTP building. Building survey completed. According to the results of the survey, the buildings were assigned to the second category of technical condition. The expected maximum additional draft of buildings and structures located within a 30-meter zone does not exceed the maximum allowable. The project provides for geotechnical monitoring of the surrounding buildings during construction and installation works.

Engineering equipment, utility networks, engineering activities

Connection to the heat supply system of the central heating point, according to the Connection Conditions, is provided from the heating main of CHPP-3, tie-in to TK-1. The connection point is at the heat input to the house in the basement of the house. The heat supply scheme is two-pipe. The laying of the heating network from the connection point to the central heating station and the inlet flanges of the valves at the thermal input is underground, channelless and in impassable channels, as well as aboveground in basements. For laying a heating network, it is planned to use steel pipelines in accordance with GOST 8731-74 in polyurethane foam insulation in a polyethylene sheath, for above-ground laying - in insulation with heat-insulating cylinders laminated with aluminum foil, with a cover layer of fiberglass, and coated with liquid glass. The design solutions provide for the installation of a prefabricated thermal chamber at the branching point of the pipelines. Compensation of thermal elongations of the heating network is solved due to the angles of rotation of the pipelines and the installation of bellows compensating devices. The heat carrier is water with Т1/Т2 = 150/70°С. Design pressure at the connection point: Р1-Р2 = 6,0 kgf/cm2, Р2 = 2,0 kgf/cm2. Thermal power of the central heating point - 5,55 Gcal / h (6,45 MW). The central heat point is automated, without attendants. The scheme for connecting pipelines of a heat network for heating systems of buildings is dependent, for connecting pipelines of a hot water supply system - independent according to a two-stage scheme. For the circulation of the coolant, frequency-controlled pumps "Wilo" IL-65 / 170-11 / 2 are provided (three working and one standby). To control the temperature of the heat carrier, the installation of a temperature controller VUG 125 F304 is provided, for pressure control - the pressure controller AFP / VFG2. For the preparation of water from the DHW system according to a two-stage scheme, the installation of two heat exchangers is provided: T5-MFG-39 with thermal power 151,5 kW and TL3-BFG-45 with a thermal power of 75,5 kW. Thermal insulation of equipment and pipelines is provided in the central heating station. The design solutions provide for the installation of a thermal energy metering unit based on the integrated heat meter LOGIKA-7961 with a flow converter RM-5-T-I. Parameters of the heat carrier in the central heating station for connecting the heat supply system of administrative and residential buildings: Т1/Т2=95/70°С Т3=65°С, Р1-Р2 = 2,65 kgf/cm2, Р2 = 3,35 kgf/cm2, Р3- Р4 = 1,5 kgf/cm2, Р4 = 3,0 kgf/cm2. Heat loads of heat consumption systems: heating – 4,345 Gcal/h; hot water supply - 0,1606 Gcal / h. The heat supply scheme is four-pipe. The design solutions provide for three outlets of heating pipelines with heat load, taking into account losses in the networks: outlet 1 - 2,535 Gcal/h; outlet 2 - 1,833 Gcal/h; release 3 - 1,095 Gcal/h. Laying of heating pipelines from the central heating substation to the heat points of consumers - underground, channelless and in impassable channels, under driveways in cases, as well as aboveground along the technical underground of buildings. For underground laying of heating pipelines, the use of steel electric-welded pipelines according to GOST 30732-2006 in polyurethane foam insulation in a polyethylene sheath is provided, when laying pipelines with diameters up to DN125 - flexible heat-insulated pipelines "Isoproflex-A" with thermal insulation from polyurethane foam, when laying steel pipelines of a heating network on the technical underground of buildings - insulated with heat-insulating cylinders, laminated with aluminum foil, with a cover layer of fiberglass, and coated with liquid glass. For laying DHW pipelines for underground laying, pipes made of cross-linked polyethylene PEX-a "Isoproflex-A" in PPU insulation in a polyethylene sheath were used, for above-ground laying - pipes made of corrosion-resistant steel 12X18H10T according to GOST 9941-81 in insulation with heat-insulating cylinders, laminated with aluminum foil, with a cover layer of fiberglass, and coated with liquid glass. Design solutions provide for the installation of prefabricated reinforced concrete thermal chambers TK-1, TK-2 and TK-3. Compensation for thermal elongation of steel pipelines of the heating network is solved due to the angles of rotation of the pipelines. Water supply (cold water) and water disposal of the consumers of the facility is provided in accordance with connection conditions. Water supply (HVS) is provided from the water supply on two inputs from pipes PE100SDR17 D=63 mm. It is planned to install a water meter unit according to TsIRV 02A.00.00.00. Guaranteed pressure at the connection point - 28 m of water. Art. Estimated consumption of cold water - 29,24 m3 / day, including for: household and drinking needs - 0,04 m3 / day; technological needs - 29,2 m3/day. Estimated consumption of cold water for irrigation of the adjacent territory (imported water) - 0,452 m3/day. Estimated consumption of cold water for periodic needs - 5,39 m3 / day 1 time per year. The drinking water supply system is a dead-end, single-zone. The required pressure for the drinking water supply system is 19,9 m of water. Art. Steel electric-welded pipes were chosen for the device of the drinking water supply system. External fire extinguishing is provided from fire hydrants D = 125 mm installed on public water supply networks. Water consumption for external fire extinguishing - 10 l / s. Discharge of industrial wastewater in the amount of 0,04 m3/day, periodic wastewater in the amount of 2,49 m3/day once a year and rainwater runoff with a flow rate of 1 l/s is provided for in the designed general sewage networks and further into the well No. 3,89 on the communal sewerage network. Polypropylene sewer pipes D = 160 mm were selected for laying the combined sewerage network. The following systems have been designed for the building: industrial sewerage (to drain waste from process equipment), external drains. Steel electric-welded pipes and cast-iron sewer pipes were chosen for the construction of the industrial sewerage system. In accordance with the technical conditions for power supply, the permitted connected power is 54,3 kW. Supply voltage - 380 V, power supply category - 2. Power sources: main power source - PS-36 (T-2), connection point - 0,4 kV switchgear TP-797, backup power source - TPP-3, connection point - Switchgear-0,4 kV TP-358. As an additional power source, it is planned to use a mobile diesel generator with a capacity of 64 kW of the 1st degree of automation. Power cables are laid from RU-0,4 kV TP-797 and from RU-0,4 kV TP-358 in the ground at a depth of 0,7 m. The cable protection at the intersection with utilities is made with asbestos-cement pipes. Throughout the route, the mechanical protection of the cable is carried out with clay bricks. The distance between mutually redundant cables is 0,3 m with clay bricks between them. For the input and distribution of electric power, a switchboard for two inputs with automatic switching on of backup power is installed in the central heating substation. Category 1 electrical receivers include a fire extinguishing system, heat metering devices, a security complex, repair and emergency lighting. A UPS is provided to power the controller. Electricity metering is provided by a direct-connected electricity meter at the input to the ShchR. The grounding of the central heating building is made with the resistance of the grounding device not more than 4 ohms. The ground loop is made with a horizontal ground electrode (steel strip 40x4) and vertical earth electrodes - angle steel 40x40x4. The boiler room is provided with a potential equalization system. The main ground bus is provided in the switchboard. A grounding system for a mobile DGU is provided by bolting the body of the DGU to the ground loop of the CHP. The building of the central heating substation is protected from direct lightning strikes and its secondary manifestations by the shielding action of high-rise buildings located in the immediate vicinity of the central heating substation. Cables and wires of the VVGng, PVSng, KVVGng and VVGng-FRLS brands are used in the boiler room. Cables are laid openly in cable ducts. The boiler rooms are equipped with working, maintenance and emergency lighting. Working lighting is made by lamps with fluorescent lamps. Emergency lighting is made with explosion-proof lamps. To illuminate the entrance, a PSH lamp with an incandescent lamp was used. Repair lighting is made at a voltage of 12V. The Automated System of Dispatching and Control of the Engineering Systems equipment was made on the basis of the technical task. The project provides for the automation of the operation of the central heating station without the constant presence of maintenance personnel. Automation and scheduling of the central heating substation is implemented on the basis of the CX1010-0011 controller. Data transfer to the CDS is carried out through two channels - the main and backup. To organize the main communication channel, a GSM Modem is used. To organize a backup communication channel, an ADSL modem and a Mikrotik RB450G router are used, which provides automatic switching of communication channels with priority to the main one. Transmission of emergency and information signals is carried out continuously. The signals are transmitted to the unified dispatching system. According to the technical specifications, for the laying of subscriber communication lines from the existing boundaries of the balance section to the objects under reconstruction, it is carried out with a PRPPM 2x0.5 telephone cable, the point of connection of the central heating station to the communication networks is located in the building of the central heating station. A telephone line has already been provided at this address in accordance with the contract. Dedicated access to the Internet and permanent access via the subscriber line is provided in accordance with the agreement "On the provision of communication services". The security alarm system is made on the basis of the terms of reference. For the security alarm device of the projected facility, the project provides for the installation of equipment that provides protection in two security lines: the perimeter of the premises: for opening - with a security magnetic contact detector "IO102-20 / B2P"; for burglary - infrared security detector "Photon-Sh"; the volume of the premises - with infrared security detectors "RX-40 QZ". As the receiving equipment of the security alarm system, the fire and security control device (PPKOP) "Matrix 832" is used. Arkan SP-2.06 is used as the signal transmission equipment for the ARC "Arkan". To transmit signals from the Matrix 832 control panel to the Arkan SP-2.06, programmable outputs built into the Matrix 832 are used. The project provides for the possibility of outputting the following signals via a radio channel to the ARCAN from the Arkan SP-2.06 device: arming; disarming; security alert; accident ~220 V; power failure; opening tamper. The project provides for the output from the device "Arkan SP-2.06" to the control panel of the central heating control panel of the signal "Penetration on the object." Further, the signal "Penetration on the object" is transmitted from the switchboard to the control room via two communication channels - the main or backup. The access control and management system is made on the basis of the terms of reference. The access control and management system is implemented using the Proxy H1000 controller, the "Exit" control button and a magnetic contact sensor. From this system, the following information signals are sent to the central control room: closed door signal; exit signal from the boiler room. To automate the water supply systems at the cold water inlet to the CHP, make-up pumps are provided, which are controlled by the BECKHOFF controller installed in the switchboard. The project provides for dry-running protection of pumps in manual and automatic modes. The unified dispatching system receives signals about operation, emergency, dry running and operating mode (manual/automatic) of the pumps. Signals about water consumption for make-up and coolant consumption are sent to the dispatching system via the SP-network from the heat meter, to which the cold water meter is connected at the input to the central heating station. Two convectors were installed to maintain the air temperature in the central heating center during the winter season. The convectors are supplied with thermostats, on the signal of which the convectors are switched on/off. To remove excess heat during the non-heating period, an exhaust fan is installed in the central heating room, which is controlled by the signals of thermostats installed in the central heating room. The signal “Emergency of the heat control system” is transmitted to the unified control room, which includes the alarm signals of fan heaters and exhaust fan. Heating of the premises of the central heating station is designed to maintain a temperature not lower than +5 ° C, and is solved due to heat gains from process equipment. In emergency mode, installation of electric heating devices (convectors) is provided. Supply and exhaust ventilation is provided in the central heating room, designed for a single air exchange of general ventilation during the cold season and for the assimilation of excess heat during the transitional and warm periods.