Architectural and space-planning solutions

A one-story building of an automated gas boiler house is attached to an existing residential building. The dimensions of the building (in axes) are 15,2 m x 20,55 m, the height from the planning mark of the ground surface to the top of the coating is 4,04 m. in terms of a metal support structure. The building has a boiler room and a diesel generator room. The roof of the building is flat with an unorganized drain. External enclosing structures and roofing are made of prefabricated sandwich panels 24,0 mm thick.

 Structural and space-planning solutions

In accordance with technical surveys, the dismantled building was built according to a mixed structural scheme. The project provides for the dismantling of the above-ground structures of the boiler house in accordance with the targeted program. The foundations of the existing boiler house are made of rubble masonry. The technical condition of the foundations is operational. The project provides for the dismantling of the boiler house and the construction of a new boiler house. The boiler room is designed from easily assembled metal structures with sandwich paneling. Metal structures are made of a closed bent profile 100x5, 120x5 according to GOST 30245-2003 (columns and roof beams), connections from a bent profile 50x4 according to GOST 30245-2003. The outer walls are hinged "sandwich" panels of the "Mega-Profile" type, 120 mm thick. The roof is soft on sandwich panels (thickness 120 mm) laid on the roof beams. The spatial rigidity and stability of the building is provided by vertical and horizontal braces and braces. The chimney (3 flues with an outer diameter of 730 mm (2 flues) and a diameter of 350 mm) ~24 m high are fixed on a spatial metal structure installed on its own foundation. The metal structures of the chimneys are made of racks (a pipe with a diameter of 219x6 in accordance with GOST 10704-91) united by a lattice of a bent-welded pipe 80x40x4 in accordance with GOST 8645-68. The calculation of load-bearing structures was carried out on a computer using the SCAD 11.5 program. The foundation is slab on a sand cushion. Monolithic reinforced concrete slab 200 mm thick, concrete B20,W6, F100. Under the foundation, crushed stone preparation with a thickness of 100 mm is provided, along a sand cushion with a thickness of 1950 mm. The foundation for the chimney is columnar on a natural base. Foundation concrete B20, W6, F100. The relative elevation of 0.00 corresponds to the absolute elevation of +5,15 ​​m. In accordance with the report on engineering and geological surveys of KAiS LLC (reg. No. 4113/1 2012), the foundations are based on silty sands of medium density with E = 150 kg/cm2, φ=28, s=3 kPa. Estimated soil resistance of the base is not lower than R=2,15 kg/cm2. The pressure on the base soil does not exceed p=0,61 kg/cm2. The maximum level of groundwater is at a depth of 1,1÷1,3 m. Groundwater is slightly aggressive towards concrete of normal permeability in terms of the content of aggressive carbon dioxide. In order to protect the concrete of underground structures, the concrete grade for water resistance is W6, the concrete surface is protected by coating with bitumen-rubber mastic in two layers. The expected average settlement of the building is no more than 2,5 mm, the stability of the pipe is ensured. 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 heat supply of heat consumption objects, an automated gas, attached boiler house is provided. According to the degree of explosion and fire hazard and fire resistance, the boiler room belongs to the category "G" and "II". The installed capacity of the boiler house is 8650 kW. The degree of fire resistance of the building - II. Explosive protection with an area of ​​easily dropped structures of at least 33,3 sq.m. Heat consumers belong to the second category in terms of heat supply reliability. The boiler room is equipped with two water-heating boilers of the S825L brand, with a heating capacity of 4200 kW (3,612 Gcal/h) each and an SK645 boiler with a capacity of 250 kW (0,215 Gcal/h), Buderus (Germany), equipped with combined gas burners, GKP-400M-I and GKP-26.21H, respectively, by Oilon (Finland). Estimated heat output of the boiler house, taking into account losses in the networks and auxiliary needs of the boiler house, will be 8528 kW (7,334 Gcal/h), including: for heating - 8208 kW (7,059 Gcal/h); at DHWmax - 250 kW (0,215 Gcal / h); for losses in heat networks and auxiliary needs of the boiler house - 70 kW (0,060 Gcal/h). The operating mode of the boiler house is year-round. Regulation of the boilers and maintaining the necessary parameters of the coolant is provided by the automation of the boiler room. A 4-pipe heating system is provided. The heat carrier of the heating system is water with a temperature of 95-70ºС, adjusted for the outdoor temperature. For the DHW system - 65ºС. The pressure at the outlet of the boiler room is P1=6,0 bar, P2=3,0 bar, P3=4,5 bar. The distribution of the coolant along the circuits is provided for in the ITP of buildings. Underground laying of pipelines of the heat supply system from the boiler room to the inputs to the buildings is provided, channelless, in channels and cases (steel pipelines in factory insulation PPU-345 with the UEC system in accordance with GOST 30732-2006), as well as along the technical undergrounds of buildings (steel seamless pipes insulated with mineral wool cylinders). To account for the consumption of cold water, to feed the boiler room in the amount of 1,59 l / s, according to the UE, a cold water meter MeiTwin Du = 50 mm Sensus is installed. For the removal of flue products of combustion, metal gas ducts and chimneys, individual for each boiler unit, are designed, 24 m high from the floor of the boiler room, with a conditional diameter of Dn = 600 mm - 2 pcs. and 230 mm - 1 pcs. The flue gas temperature is 124°C. Thermal insulation of heat pipelines, gas ducts and auxiliary equipment is provided. Gas supply of the boiler house with a gas flow rate of QpН=33,52 kJ/m3 (8000 kcal/m3), at 1010,7 cubic meters/hour is provided, according to the Technical Specifications, from the existing underground medium-pressure polyethylene gas pipeline D=225 mm, laid along the street, with the subsequent laying of an underground medium-pressure polyethylene gas pipeline Æ160x14,6 mm and an elevated steel pipeline D=133x4,5 mm to the designed gas control point of the ShRP-NORD-NORVAL 65-2 type, located on the facade of the boiler house, with a commercial gas consumption metering unit based on a gas meter DN=150 mm STG 150-1000. The laying of underground gas pipelines of medium pressure is provided from polyethylene pipes in accordance with GOST R 50838-2009 PE 100 GAS SDR11. For laying steel ground sections of gas pipelines, it is provided from straight-seam pipes according to GOST 10704-91. The gas pressure at the outlet of the gas distribution point is 5 kPa. At the entrance of the gas pipeline to the boiler room, the following are installed in series: Welded ball valve Vexve with a reducer DN=250 mm and an insulating joint SI-250s. Water supply (cold water) and water disposal of the object's consumers is provided in accordance with the connection conditions. Water supply (HWS) is provided from the public water supply network D = 700 mm along Zvenigorodskaya st. on two inputs from pipes PE100SDR17 D=90 mm. The project provides for the installation of a water meter unit. Guaranteed pressure at the connection point - 28 m of water. Art. Estimated consumption of cold water - 41,48 m3 / day (feeding heating networks, filter regeneration, hot water preparation, cleaning); periodic needs - 141,88 m3 / day (filling the heating network system and the boiler circuit once a year). Water consumption for irrigation of the adjacent territory is 1 m0,124/day (with imported water). Water consumption for internal fire extinguishing - 3 l / s (5,0 jets of 2 l / s). The number of fire hydrants D = 2,5 mm - less than 50 pcs. The building has an integrated plumbing system. The required pressure for the integrated water supply system is 12 m of water. Art. The integrated water supply system is a dead-end, single-zone. Steel electric-welded pipes were chosen for the device of the integrated water supply system. External fire extinguishing is provided from a fire hydrant 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 1,25 m3 / day, periodic discharge - 20,48 m3 / day 1 time per year (system emptying), rainwater with a flow rate of 4,64 l / s is provided for in the nearest manhole on the yard network communal all-alloy municipal sewer D=250 mm. Polypropylene sewer pipes D = 160 mm were selected for laying the combined sewerage network. Industrial sewage systems (for the removal of conditionally clean effluents from boiler equipment) and external drains were designed for the building. Cast-iron sewer pipes were chosen for the installation of the industrial sewerage system. The power supply of the boiler house, in accordance with the specifications, is provided from two independent power sources: from the switchgear-0,38 kV of the new TP (instead of TP-32) and from the SDMO J200K Nexys Silent diesel generator with a capacity of 144 kW (180 kVA), which is in the mode waiting for automatic start. Power supply PS-542. Electricity supply to the designed boiler house is provided through a 0,4 kV cable line (cable brand APvBbShp 4x185) from the new transformer substation.