Architectural and space-planning solutions

For a relative mark of 0,000, the mark of the clean floor of the boiler house building was taken, which is +3,150 in the Baltic height system. The building of the built-in gas boiler house, subject to technical re-equipment, is complex in plan, five-story, with a basement (without a basement in the B-G / 1-6 axes) and an attic. The built-in boiler room is located on the ground floor of the building in the axes A-D/1-6. The dimensions of the boiler room along the axes А-Г/1-6 are 32,0 × 5,8 m, the height of the boiler room is from 4,3 to 4,5 m. The structural scheme of the building is wall with load-bearing longitudinal and transverse walls. The floors are concrete with tiled floors. During the technical re-equipment of the boiler house, the load-bearing structures (walls and floors) undergo cosmetic repairs, increase the window opening in height to provide a separate exit to the street. During re-equipment, the premises of the ITP are separated. The purpose of the premises does not change. To reduce the volume of the boiler room, in order to provide the required area of ​​the LSC (easy to drop structures), partitions are installed between the axes "2" and "4". The project documentation provides for the repair of brickwork - sealing cracks and flaws with the help of special solutions. Restoration of the damaged plaster layer is provided. Existing floors are to be demolished. The new floors are made of ceramic tiles on a leveling screed on a 100 mm thick force plate. Separate foundations are provided for the boilers. The existing boiler room is divided into four rooms: the boiler room itself, two technical rooms and the ITP room. Doorways in the partitions between the premises of the ITP and the boiler room are laid with solid bricks. Outside the building, to provide access to the ITP, in the place of the existing window opening, an entrance door is arranged, while the ITP room and the boiler room are separated and do not have communication with each other. The boiler room has a length of more than 12 m, and to provide a second exit from the boiler room in the axes "5" - "6" in the place of the existing window opening, an entrance metal insulated door is provided. All windows and doors will be replaced on the premises. In places of openings for ventilation grilles (to expand existing openings), steel lintels are provided. The windows are designed with single glazing to meet the requirements for easy drop structures (LSK). All windows play the role of LCS. The total window area is 14,4 m2. To protect the building from noise, the design documentation provides for additional sound insulation of the walls using mineral wool 100 mm thick with plasterboard lining. The ceilings of the premises, to increase the degree of fire resistance, are provided with sheathing with special fire-retardant materials. The ceiling finish is designed with water-based paint. Finishing of the premises of the building - painting with water-based paint on the prepared surface. The exhaust stacks are designed to rest on the existing brick wall at the site of the old chimney. The exhaust shafts are designed from rolled pipes 360x1,2 made of alloy steel, with an outer diameter of 560 mm, taking into account thermal insulation.

Structural and space-planning solutions

In accordance with technical surveys, the existing building (in which the built-in boiler house is located) was built before 1917 according to the wall structural scheme. The project provides for the technical re-equipment of the built-in gas boiler. The foundations of the existing building are strip masonry. The depth of foundations is 2,3 m, the width of the base is ~1600 mm. At the base of the foundations lie silty sands of medium density. The technical condition of the foundations is operational. External and internal walls - load-bearing, brick thickness 690÷730 mm. The technical condition of the walls is operational. Ceilings - on metal beams filled with reinforced concrete slabs. The technical condition is limited operable. The roof is wooden rafters supported by brick load-bearing walls. The roof is in working order. The rigidity and stability of the building is ensured by the joint work of the longitudinal and transverse walls of the floors united by hard disks. The project documentation provides for the installation of a power floor slab (in the boiler room) from monolithic reinforced concrete and foundations for boilers. Slab 100 mm thick, designed in concrete B15, W6, F75. The project documentation provides for the dismantling of the existing chimney and the installation of a new one. The chimney (3 flues with an outer diameter of 560 mm) 28,0 m high is fixed to the wall of an existing residential building. The relative elevation of 0.00 corresponds to the absolute elevation of +3,15 m. In accordance with the report on engineering and geological surveys, silty sands of medium density saturated with water with E=110 kg/cm2, φ=26, c=2 kPa serve as foundations for the equipment. The maximum level of groundwater is at a depth of 1,5 m. Groundwater is slightly aggressive towards concrete of normal permeability in terms of the content of aggressive carbon dioxide and the hydrogen index. In order to protect the concrete of underground structures, the concrete grade for water resistance is W6. The settlement of the building is not expected. In accordance with the technical conclusions, the following fall into the risk zone: 3-5-storey public building at the address Karavannaya st., 7, lit. And ~ 27 meters from the built-in boiler room; 4-5-storey public building at Nevsky prospect, 60 (OKN) ~ 27 meters from the built-in boiler room; 2-4-storey public building at Nevsky prospect, 62 (OKN) adjoins the built-in boiler building; 3-6-storey public building at the address Karavannaya st., 9, lit. A (OKN) adjoins the building of the built-in boiler room; 5-7-storey residential building at the address Karavannaya st., 11/64, lit. And the building of the built-in boiler room (rooms above the built-in boiler room). The expected additional settlement of the surrounding buildings is less than the maximum allowable values. All buildings belong to the second category of technical condition.

Engineering equipment, utility networks, engineering activities

For the heat supply of buildings, technical re-equipment of the existing gas boiler house and reconstruction of heat networks are provided. According to the degree of explosion and fire hazard, the boiler room belongs to category "G". The installed capacity of the boiler house is 2,96 MW. Consumers of thermal energy belong to the second category in terms of reliability of heat supply. The boiler room is equipped with two Buderus Logano GE615 hot water boilers with an installed capacity of 1020 kW each and one Logano GE615 with an installed capacity of 920 kW with Oilon GKP-90H burners. Estimated productivity of the boiler house, taking into account losses in the networks and auxiliary needs of the boiler house - 2,838 MW, including: for heating - 2,612 MW; for losses in heat networks - 0,182 MW; auxiliary needs of the boiler house - 0,044 MW. Fuel - natural gas QpН = 33520 kJ/m3 (8000 kcal/m3). The scheme for connecting heat networks intended for transporting heat carriers to heat consumption systems is independent through heat exchangers. It is planned to control the temperature of the coolant depending on the outside air temperature. Regulation of the boilers and maintaining the necessary parameters of the coolant is provided by the automation of the boiler room. The operation of the boiler room is in automatic mode, without the constant presence of service personnel. The maximum water temperature at the outlet of the boilers is 110°C. The heat carrier at the outlet of the boiler room is water with a temperature of 95°C. To compensate for thermal expansion of the water in the boiler circuit, two Reflex expansion tanks with a capacity of V=200 l each and a preliminary capacity of V=60 l are provided. To clock the frequency of switching on the booster pumps, a wall-mounted membrane tank V = 200 l is provided on the feed line. Auxiliary equipment is installed in the boiler room: individual pumps of the boiler circuit IL50/200; network pumps IL125/320; make-up pumps MVI 403; plate heat exchangers ТL6-РFG - 2 pcs. with a capacity of 1880 kW each; chemical water treatment unit based on SLS 0844TW water softening unit, SLI 1054duplex deironing unit, vekrasol-carbon dosing complex and advantage K530V. Accounting for the consumption of thermal energy is provided by installing a metering unit for the consumption of thermal energy based on electromagnetic flow meters. To remove the products of combustion, metal individual gas ducts and chimneys are designed with a height of 28,0 m from the floor of the boiler room, with a diameter of 350 mm. The temperature of the outgoing flue gases is 174°C. The design documentation provides for thermal insulation of heat pipelines, gas ducts and equipment. Gas supply to the boiler house is provided in accordance with the specifications. The connection point is a steel overground medium pressure gas pipeline with a diameter of 89 mm. From the connection point, it is planned to lay a medium-pressure steel gas pipeline with a diameter of 65 mm along the facade of the boiler room to the entrance to the ground, then lay an underground polyethylene gas pipeline of medium pressure with a diameter of 90 mm to the exit from the ground near house No. 9. To the ShRP - NORD - installed at the facade of house No. DIVAL 9/600-40, laying is provided from the exit from the ground of a steel above-ground gas pipeline of medium pressure 2 mm, from the ShRP to the entrance to the ground of a low steel one - with a diameter of 80 mm, then a low-pressure polyethylene gas pipeline with a diameter of 150 mm, to the exit from the ground near the boiler house and laying elevated low-pressure steel gas pipeline before entering the boiler room. For above-ground laying steel electric-welded longitudinal pipes according to GOST 160-10704, V-91 GOST 10-10705* are selected, for underground - polyethylene PE80GAZ SDR100. Gas pressure at the connection point - 11 MPa. The maximum gas consumption is 0,11 m345,9/h. At the entrance of the gas pipeline to the boiler room, the following are installed: thermal shut-off valve KTZ-3; gas filter series FF-150; solenoid valve series EVPS12. Gas metering is provided by a measuring complex based on the SG12MT-16 meter, unit-wise metering - SG400MT-16. From the boiler house for heat supply to consumers, heat networks have been designed. Parameters at the connection point: P1-P2=15 m of water. Art., Р2=25 m of water. Art., T1=95°C, T2=70°C. Heat load of heat consumption systems - 2,2457 Gcal/h. The connection point is the collector of the boiler room. Laying of pipelines of the heating network - underground channelless, in approaching the foundations of buildings - in channels and under roads and in arches - in cases, as well as aboveground along the technical underground of buildings. For underground laying of pipelines of the heating network, steel pipelines of PPU-345 insulation were selected, for above-ground laying - steel pipelines according to GOST 10704-91 insulated with mineral wool cylinders with a cover layer of fiberglass impregnated with liquid glass. Compensation for thermal elongations is provided 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; connection conditions. Water supply (HVS) is provided from the public water supply network D = 150 mm along Karavannaya st. on two inputs from pipes PE100SDR17 D=110 mm. Connection points - on public water supply networks. The inputs provide for the installation of water metering units according to TsIRV 02A.00.00.00 (sheets 192,193). Guaranteed pressure at the connection point - 28 m of water. Art. Estimated consumption of cold water - 8,13 m3 / day (feeding of heating networks, filter regeneration, cleaning); periodic needs - 41,68 m3 / day (filling the heating network system and the boiler circuit once a year). Water consumption for irrigation of the adjacent territory is 0,043 m3/day (imported water). Water consumption for internal fire extinguishing - 5,0 l / s (2 jets of 2,5 l / s). The number of fire hydrants with a diameter of 50 mm is less than 12 pcs. The building has an integrated plumbing system. The required pressure for the combined water supply system is 25,13 m of water. Art. (for technological needs); 18,57 m w.c. Art. (for firefighting needs). The integrated water supply system is a dead-end, single-zone. Galvanized steel water and gas pipes and stainless steel pipes were selected for the installation of the integrated 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 1,17 m3 / day, periodic discharge - 3,5 m3 / day 1 time per year (system emptying), rainwater with a flow rate of 1,07 l / s is provided for in the nearest manhole on the yard network communal all-alloy municipal sewer D=225 mm.