Architectural and space-planning solutions

The project documentation provides for the construction of a boiler house building on the site of the existing boiler house building to be dismantled. For a relative mark of 0.000, the mark of the clean floor of the boiler room is taken. The building is one-story, rectangular in plan, with dimensions in the extreme axes of 21,70 x 8,67 m. The height of the building from the planning mark of the ground to the top of the parapet is 5,76 m. The building adjoins the existing residential building along axis B. The building consists of two rooms - a boiler room and a diesel generator room. In the axes 1-2/A/B at the level of 2,70 in the boiler room, a technological platform was designed from metal structures with a metal staircase. The site has a 1,2 m high fence. The boiler room has two dispersed exits to the outside, the exit from the diesel generator room is through the boiler room. The height of the premises from the floor to the bottom of the protruding structures is 5,0 m. 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 a sandwich panel. Window openings and openings filled with ventilation metal grilles are designed in the outer walls. Filling of window openings - metal-plastic window blocks with single glazing. The covering is flat combined. The roof is rolled with an external unorganized drain. Above the entrances to the building are designed metal canopies.

Structural and space-planning solutions

The constructive scheme of the boiler house is frame-bonded. Frame - steel, in the transverse direction, two-span (spans - 3,671 and 5,000 m). Steel C245, 235. External walls - hinged sandwich panels 200 and 100 mm thick, horizontally mounted, with fastening to half-timbered houses. Columns, half-timbered elements and supports of technological equipment are made of closed bent-welded profiles. The roof beams of the building are made of rolled I-beams, single-span, with hinged support at one end on the top of the column, and with hinged fastening to the side of the column at the other end. Fastening beams - bolted. The overlapping of the technological platform is made of sheet steel 4 mm thick according to the system of cross beams. Floor beams - their rolled I-beams and channels, with hinged fastening to the columns. The vertical stiffening braces of the building - from closed bent-welded profiles - are designed along the outer axes of the building in two directions. Covering - single-pitched profiled flooring SKN 157-800-1,2 on steel beams. Horizontal connections of the rigidity of the coating - from closed bent-welded profiles. The spatial rigidity and stability of the building is ensured by the joint work of the frame, vertical stiffening braces in two directions and horizontal bracing of the coating. Gas ducts - pipes with a diameter of 300 and 500 mm from corrosion-resistant sheet steel 1,5 mm thick, with external insulation with a layer 100 mm thick and protected by a casing made of galvanized steel sheet. Gas ducts - 23 m high, supported on foundations and fastened to the walls of neighboring buildings with anchors through horizontal diaphragms (platforms) and brackets, in the attic and parapet area - fastened with clamps to a steel clip. The force on the fixing anchor for pulling out is 80 kg. The step of mounting diaphragms in height is no more than 4 m. The calculations were performed using the SCAD v.11.3 software package. The mark of the floor of the boiler room, corresponding to the absolute mark of 0,000, was taken as 8.87. The foundations were developed on the basis of engineering and geological surveys carried out at the construction site. The foundations of gas ducts and the building of the boiler house are slab. The foundation of the building is a monolithic shallow reinforced concrete slab 400 mm thick, made of concrete B25, W6, F200 and reinforcement class A400 and A240. The absolute mark of the sole is 8.43. The pressure under the base of the foundation of the boiler house is 0,05 MPa. The foundations of the gas ducts are monolithic shallow reinforced concrete slabs 300 mm thick, made of concrete B25, W6, F200 and reinforcement class A400 and A240. The absolute mark of the sole is 8.55. The foundations of the gas ducts are designed based on the preserved foundations of the dismantled building. The stability of the foundations against overturning is ensured by anchoring into the body of the preserved foundations. Preparation for the foundation of the boiler room - from a layer of monolithic concrete B7,5, 100 mm thick. Bulk soils at the base of the foundation of the boiler house are replaced with a sand cushion of medium-grained sand with a density of at least 1,65 t/m3 to the depth of the base of the preserved foundations. The design resistance of the sand cushion is 0,15 MPa. The base of the sand cushion is coarse sand of medium density saturated with water (IGE-2) with e = 0,65, E = 25 MPa, φII = 38° with a design resistance of 0,246 MPa. The project documentation provides for measures to protect underground structures from groundwater: coating insulation of the side surfaces of the foundations, the use of low-permeability concrete W6. The expected settlement of the foundation of the boiler house is 3,52 cm. The additional settlement of the wall of the neighboring house will not exceed 0,38 cm, the roll is 0,0008. The design documentation provides for monitoring of construction and surrounding development. The boiler house building was designed on the site of the dismantled boiler house building with the preservation of the existing foundations of the boiler house, located along the foundations of the adjoining building. To reduce the negative impact on the neighboring building, the design documentation provides for the construction of foundations with a standardized indentation from the walls of neighboring buildings - 300 mm and excavation of the pit with grippers. The survey of the dismantled building of the boiler house was completed. The 1-2 storey building without a basement was built in 1958. Walls and pillars - from solid ceramic bricks 530 mm thick. Ceilings - from reinforced concrete slabs on steel beams. The chimney is on its own foundation, the ventilation duct is attached to the wall of the neighboring building. Foundations - tape rubble. The condition of the structures is recognized as being of limited working capacity. Category of the technical condition of the building - 3.

Engineering equipment, utility networks, engineering activities

For the heat supply of buildings, an automated, gas, attached boiler house was designed. According to the degree of explosion and fire hazard, the boiler room belongs to category "G". The installed capacity of the boiler house is 6,0 MW. Facade glazing is provided as easy-to-reset structures at the rate of 0,03 m2 per 1 m3 of the volume of the boiler room. Heat consumers belong to the second category in terms of heat supply reliability. Three hot water boilers of the Termotekhnik TT100 brand are installed in the boiler room: two with a heating capacity of 2500 kW and one 1000 kW with combined burners Oilon GKP-280M and GKP-130M. The estimated heat output of the boiler house, taking into account losses in the networks and auxiliary needs of the boiler house, will be 5,421 MW, including: for heating and ventilation - 4,483 MW; DHW - 0,485 MW; for losses in heat networks and auxiliary needs of the boiler house - 0,453 MW. The main type of fuel is natural gas QpН = 33520 kJ/m3 (8000 kcal/m3). The operating mode of the boiler house is only during the heating period. The scheme for connecting heat networks and DHW pipelines intended for transporting the coolant to heat supply 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 115°C. The heat carrier at the outlet of the boiler room is water with a temperature of - 95°C. To compensate for the thermal expansion of water in the boiler circuit, expansion tanks are provided. Auxiliary equipment is installed in the boiler room: boiler circuit pumps IPL50/130 and 65/145; network circuit pumps IL 150/340; plate heat exchangers M15-BFG T5-MFG; installation of chemical water treatment SLS2162 Duplex. To account for the consumption of thermal energy, it is planned to install a heat consumption metering unit based on electromagnetic flow meters. To remove combustion products, metal individual gas ducts and chimneys with a diameter of 500 mm (for 2500 kW boilers) and 300 mm in diameter (for a 1000 kW boiler) are designed. The temperature of the outgoing flue gases is 190°C. The design documentation provides for thermal insulation of heat pipelines, gas ducts and equipment. Reserve fuel supply is not provided according to the letter of the Committee for Energy and Engineering Support dated November 30.11.2011, 15 No. 18783-11 / 0-1-0,8. The designed tank for diesel fuel with a volume of XNUMX m³, fuel lines and shut-off and control valves provide for the possibility of operating the boiler house on liquid fuel. Gas supply to the boiler house is provided in accordance with the specifications. The connection point is a medium-pressure steel gas pipeline with a diameter of 159 mm. For gas supply to the boiler house, it is planned to lay an underground medium-pressure polyethylene gas pipeline with a diameter of 160 mm in accordance with GOST R 50838-95 to ShRP-NORD-NORVAL / 50-2/01, installed at the facade of the boiler house building, laying an elevated low-pressure steel gas pipeline with a diameter of 219 mm from ShRP to entering the boiler room. The gas pressure at the tie-in point is 0,108 MPa. The gas pressure at the inlet to the boiler room is 0,005 MPa. Steel electric-welded longitudinal pipes according to GOST 10704-91, V-10 GOST 10705-80* were selected for laying. For commercial accounting of the amount of gas, a gas meter of the SG16MT type is installed. The maximum gas consumption is 701,1 m3/h. At the entrance of the gas pipeline to the boiler room, the following are installed in series: thermal shut-off valve KTZ-001; gas filter series FN8; solenoid valve EVPS/NS series. From the building of the boiler plant for heat supply to consumers, heat networks are designed. Parameters at the connection point: P1-P2=2,0 kg/cm2; P2=3,5 kg/cm2; Р3=3,5 kg/cm2; T1=95°C; T2=70°C; Т3=65°С. The connection point is the collectors of the boiler room. The laying of the heating network is accepted as two-pipe and four-pipe, underground, channelless, in cases and impassable channels, as well as aboveground along the technical undergrounds of buildings. Pipelines of the heating network are accepted in accordance with GOST 10704-91 steel electric-welded in polyurethane foam insulation, as well as Isoproflex-A pipes with thermal insulation made of polyurethane foam in a waterproofing sheath made of polyethylene. Pipelines of the heating network laid through the territory of the square are not shifted. DHW pipelines are accepted for underground laying - "Isoproflex-A", when laying along the technical underground - pipelines made of EKOPLASTIK polypropylene, in thermal chambers - pipelines made of corrosion-resistant steel. Compensation for thermal elongations is carried out due to the angles of rotation of pipelines of the heating network. To improve the reliability of the power supply to the boiler plant, it is planned to install a SDMO J130 Nexys diesel generator in a separate room. Water supply and sewerage of consumers of the facility in accordance with the UE. Water supply to the boiler house is provided through two inlets from PE100SDR17 pipes D = 110 mm, from the public water supply network D = 400 mm. At each input, water-measuring units are installed according to the drawings of the TsIRV 02A.00.00.00 l album. 268, 269 with counter L = 65 mm, without bypass lines. Guaranteed head at the connection point 28 m w.c. Art. Estimated consumption of cold water for permanent needs - 89,97 m3 / day, including: for the preparation of hot water - 75,93 m3 / day; for feeding the heating network - 13,92 m3 / day; for household needs - 0,12 m3 / day. Estimated consumption of cold water for periodic needs: for filter regeneration - 4,55 m3/day (1 time per week); for filling the boiler room - 11,0 m3 / day (1 time per year); for filling heating networks - 77,4 m3 / day (1 time per year). The building provides for a system of separate production B1 and fire B2 water supply. Water supply networks B1 and B2 are dead ends. The required pressure for the drinking water supply system is 46,45 m of water. Art. The pressure is provided by a booster pump. The water supply system is dead-end, from booster pumps (1 work, 1 cut). The required pressure for the B2 water supply system is 16,73 m of water. Art. The pressure is provided by the pressure in the utility network. Stainless steel pipes (made of steel 1X08H18) were selected for the installation of the B10 water supply network, galvanized steel pipes for the B2 water supply network in accordance with GOST 3262-75 *. External watering taps are not provided. Hot water supply is not provided. Water consumption for internal fire extinguishing - 5,0 l / s (2 jets of 2,5 l / s). Number of fire hydrants D = 50 mm, 2 pcs. External fire extinguishing, with a flow rate of 10 l / s, is provided from a fire hydrant D = 125 mm, installed on the public water supply network. The sewerage of the boiler house is provided for by two outlets D = 150 mm through the cooler wells. Sewer networks are not provided inside the boiler house building; The external network is provided from two-layer corrugated PP pipes D = 6942/98 mm. Drainage is provided for in the well No. 160a on the network of the yard combined sewer D = 139 mm, located in the same yard with the boiler house. The nature of the effluents is periodic and is: during the regeneration of filters - 146 m230 / day (4,55 time in 3 days); when emptying the boiler system - 1 m5 / day (11,0 time per year). Constant consumption when washing floors - 3 m1 / day. The discharge of surface runoff from the roof and the territory of the boiler house is carried out to the existing storm water well No. 143a on the network of the yard combined sewerage D = 230 mm, located in the same yard with the boiler house. The estimated rainfall flow is 2,04 l/s. Heating is air. The heat carrier for the heating system of the boiler room is a 45% propylene glycol solution with a temperature graph of 95-70ºС, heated in a heat exchanger with water from the boiler circuit with a temperature graph of 110-75ºС. 3 heaters KSK3-9 are used as heating devices. To maintain the air temperature in the diesel generator room +15°С, it is planned to install two panel radiators Konrad RSV 5-22-3 with a Danfoss RA temperature controller. Pipelines of the heating system are steel water and gas pipelines in accordance with GOST 3262-75 and electric welded in accordance with GOST 10704-91. Ventilation. Ventilation supply and exhaust natural and mechanical. Air exchange is designed for the assimilation of excess heat. The air enters the boiler room through the louvered grilles. Removal of air through the deflectors on the roof. To remove excess heat, an axial fan is provided, which can also be switched on by the gas analyzer in case of absence