Architectural and space-planning solutions

The design documentation provides for the construction of a central heating unit building. The building adjoins the wall along axis B to the wall of an existing residential building. For a relative mark of 0.000, the mark of the finished floor of the 1st floor was taken. The building is one-story, with dimensions in the extreme axes of 10,50 x 2,80 m. The height of the building from the planning mark of the ground to the roof ridge is 3,49 m. The building consists of two rooms - a central heating point (boiler room) and a diesel generator room, with independent entrances with porches. The facades of the building are designed from sandwich panels with a polymer coating. Plinth - galvanized steel with weatherproof paint. The inner wall separating the two rooms is brick. Openings in the outer walls are designed to be filled with ventilation metal grilles. Roof - rolled. The coating is pitched, combined, with an external unorganized drain.

Structural and space-planning solutions

The central heating building is designed in a steel frame made of box-section elements. External walls - three-layer "sandwich" - panels 100 mm thick. The plinth of the outer walls is three-layer, with a total thickness of 340 mm, made of solid brick with an inner layer of insulation and cladding. Covering - profiled flooring on steel girders. The spatial rigidity and stability of the central heating building is ensured by the rigid coupling of the columns with the foundation and the hard disk of the roof. The foundation for the CTP building is assumed to be shallow on a natural foundation in the form of a monolithic reinforced concrete slab 300 mm thick with pits 1,95 m deep (pit walls and bottom 200 mm thick). Concrete B25, W8, F100, class AIII reinforcement. The project provides for the replacement of bulk soil and the installation of a sand cushion of coarse sand with layer-by-layer compaction 1,5 m thick. Under the foundation, concrete preparation 100 mm thick is provided for a layer of crushed stone-sand mixture 300 mm thick. The underlying layer of the crushed stone-sand cushion under the boiler building is medium-density silty sands saturated with water EGE-2 (E=15MPa, e=0,700). Calculations of load-bearing structures were performed using the SCAD 11.1 software package. The relative elevation of 0.00 corresponds to the absolute elevation of +3,15m. The foundations are designed on the basis of engineering and geological surveys. Groundwater was recorded at a depth of 1.4 m (absolute elevation 1.45–1.35 m). The maximum position of the groundwater level is assumed at a depth of 0.5 m (absolute elevation 2.30 m). Groundwater is non-aggressive to concrete of normal permeability. The project provides for the dismantling of the above-ground part of the existing boiler house building with partial preservation of the foundation structures in the area adjacent to the existing residential building. The results of a survey of building structures of buildings falling into a 30-meter construction zone are presented. The buildings were examined by specialists and, according to the results of the survey, were assigned to the II category of technical condition. The draft of the designed building is less than 1 cm.

Engineering equipment, utility networks, engineering activities

The reconstruction of the heat supply system provides for the connection of the heat-consuming systems of nine residential buildings to the city's heating networks through the central heating station being designed on the spot of the dismantled boiler house. The reliability category of heat supply to heat consumers is the second. Heat carrier parameters at connection points: Р1-Р2=30 m w.st.; Р2=40 m w.st.; Т1/Т2=150/700С. The heat supply system from the distribution network is two-pipe, the connection scheme is dependent. The thermal power of the central heating station is 2,967 Gcal/h, the connected load is 2,485 Gcal/h. Laying of heating networks 2x150 from UVV-2: underground channelless; along the basement 7; underground in the channel; along the basement 7 to the underground entrance to the central heating station, attached to house 7 (on the spot of the boiler house being dismantled). The laying of heating networks in the basement is provided taking into account the provision of emergency exits from the premises, taking into account the installation of devices for draining water at the lowest points of the systems and air vents at the highest points. Pipes: for underground channelless laying - flexible "Kasaflex" from corrugated stainless steel in PPU insulation; in the basement of the building - seamless steel pipes gr. In article 10 GOST 8732-78 in PPU-PE insulation. Compensation for temperature elongations - due to the angles of rotation of the route and fixed supports. Descent of water into the sewer - through the bypass wells, taking into account the possibility of cooling. Coolant at the inlet to the central heating substation: Т1/Т2-150/700С; Р1-Р2=30 m w.st.; Р2=41,7 m w.st. The heat carrier in heating systems is T1.1/T2.1=95/700C. At the inlet to the central heating station, there are: flange fittings, a sump with a mesh filter, a commercial heat metering unit, a MAP21 differential pressure regulator with an AFD control unit. Preparation of the heat carrier of heating systems is provided in the mixing unit with the help of three circulation pumps IPL 65/130-3/2 by Wilo with frequency regulation, of which two pumps are working. The heat carrier temperature control according to the temperature curve is provided by a two-way control valve VUG with an AVF 234 S FI32 electric actuator and an MV adapter from Sauter before the mixing unit, a temperature sensor after the mixing unit and a KONTAR MC12 controller with an outdoor temperature sensor. Feeding of heating networks - from supplying heating networks. Descent of water into the sewer - through the ladder and the bypass well. Pipes - straight-seam electric-welded steel pipes GOST 10704-91, steel water and gas pipes GOST 3262-75 in universal flexible thermal insulation based on Armaflex synthetic rubber. Three outlets of heating networks are provided from the central heating network, depending on the location of the connected residential buildings. The heating system of ITP houses is two-pipe (95/700C). The laying of heating networks from the central heating station is mixed: underground channelless, in channels, in a case, above ground and in the basements of buildings. Pipes for underground laying - from cross-linked polyethylene PE-S in thermal PPU insulation in a corrugated polyethylene sheath - "Isoproflex-A" according to TU 2248-0211-40270293-2005. For above-ground laying - steel electric-welded longitudinal pipes GOST 10704-91 gr. In article 10 in insulation from mineral wool products with a cover layer of thin-sheet galvanized steel; in the basement - steel electric-welded pipes GOST 10704-91 in insulation from mineral wool products with a cover layer of fiberglass. Shut-off, drain and air outlet fittings are made of steel. Water supply (cold water) and water disposal of consumers of the facility is provided in accordance with: connection conditions. Estimated consumption of cold water - 0,012 m3 / day (cleaning the premises once a month with imported water). External fire extinguishing is provided from existing fire hydrants D = 1mm installed on public water supply networks. Water consumption for external fire extinguishing - 125 l / s. Disposal of domestic wastewater in the amount of 10 m0,78/day (3 time per year), 1 m0,012/day (3 time per month) and rainwater with a flow rate of 1 l/s is provided for in the utility networks of the yard combined sewer D= 2,9 mm. Polypropylene sewer pipes D = 250 mm were selected for laying the combined sewerage network. A cooler well has been designed to cool industrial wastewater to 160C in case of emergency discharge. Household and industrial sewerage systems (for the removal of conditionally clean effluents) and external drains have been designed for the building. Cast-iron sewer pipes were chosen for the installation of a domestic and industrial sewerage system. Power supply PS 400. Power supply, in accordance with the specifications, is provided from the switchgear 0,38 kV TP 857 through one designed cable line. The number of cables in the cable line is 1. Cable APvBbShp 4x35 is accepted for laying. Power supply is provided according to the 3rd category of reliability. To ensure the reliability of power supply to the central heating substation in the second category, it is planned to install an SDMO diesel generator set (model - J33K Nexys Silent) with an automatic start system. The start-up time of the backup power supply source (taking into account the diesel generator's normal operation mode) is 1 minute 40 seconds from the moment the power supply from the centralized power supply system is interrupted. Estimated load for the second category of power supply reliability is 15,72 kVA. Consumers of the 1st category of power supply reliability include: AVR device (OMD800), gas contamination system, dispatching system, buzzer, emergency shutdown device, control units for technological equipment of the central heating station, security system and automatic fire extinguishing system. The first category of power supply reliability is ensured by the presence of uninterruptible power supplies Istok IPD-1/1-1-220-A. The design load for the first category of reliability is 0,4 kW. The cable of the external power supply system is connected to the input switch of the ShchV-1 shield, and the cable from the diesel generator is connected to the input switch of the ShchV-2 shield. Two independent sections of the RSH shield are connected to the SCHV-1,2 inlet shields from the side of the central heating substation, each section is protected by its own circuit breaker installed in the ATS of the RS shield. Mains voltage - 380/220 V. TN-CS earthing system. Electricity metering is provided for one power supply input of the central heating substation. Installation of one three-phase electricity meter Mercury 230ART-01 PQRSIGDN is provided. For power networks, cables of the VVGng brand and wires of the PVS, PV1, PVZ brands were selected. Lighting fixtures with incandescent lamps and ARCTIC 2x36 fluorescent lamps were chosen to illuminate the premises. For emergency lighting, luminaires of the POINTER-NI-PC-WR 2x11 type are installed. To ensure electrical safety, a potential equalization system and installation of protective devices are provided. Lightning protection - on the third level of protection. To control the functioning of the engineering equipment of the boiler room, a dispatching system is provided. To organize communication channels in accordance with the contract, a connection to an existing cable gland is provided. The output of signals to the centralized control room is provided through two independent communication channels: through an ADSL modem over a wired telephone line and through a GSM modem over a radio channel. Work-automated, TsTP without constant presence of service personnel. The central heating automation is implemented on the basis of Beckhoff CX1010-0011 controllers installed in the control panel. The transfer of the following information to the control center is provided: emergency signals in the technological part of the central heating substation, signals of security and fire alarms of the central heating substation, operating parameters of the central heating substation. Heating of the premises of the central heating point is provided by heat transfer from process equipment. When the equipment is not working (heating circuit pumps are turned off in emergency mode), heating is provided by electric convectors from Noirot (France). In the diesel generator room, constant heating is provided by an electric convector. Ventilation of the premises is natural. In the heat point, air exchange is designed for the assimilation of excess heat. Supply and exhaust are provided through louvered grilles in the outer walls, installed at different elevations from the ground level. In the diesel generator room in the operating mode, air exchange is accepted according to the manufacturer's data. Supply - through an air valve in the outer wall, exhaust - through an air duct connected to the process equipment, with air ejected into the atmosphere.