Architectural and construction solutions

The boiler room belongs to category G in terms of explosion and fire hazard in accordance with SNiP II-35-76. The degree of fire resistance of the module design is II. For relative elev. 0.000 accepted el. clean floor of the boiler room, which corresponds to the absolute elev. +19.000 accepted in the Baltic system of heights. The location of the building on the ground, see gene. plan 111-632-1/09-SPO, sheet 2. The boiler room is a building structure without a basement and an attic, consisting of a metal frame sheathed with three-layer panels with a Rockwool type insulation. The dimensions of the AKM "Signal-6000" module in terms of 6000 x 18000 mm, height - 3500 mm. Construction volume V=393,49 m3. Building area S=125,09 m2. The exit from the boiler room is provided directly to the outside. The roof of the boiler room with an area of ​​112,8 m2 serves as an easily dumped structure. The foundation for the boiler building is a monolithic reinforced concrete slab 200 mm thick with a concrete preparation of 100 mm. To remove combustion products, a chimney is installed in the climatic region IIb (t = -26 oC), wind region II (30 kgf / m2). In accordance with SNiP II-23-81 *, load-bearing structures made of steel grades S285 GOST 27772-88 are used. The pipe is a metal structure of column type with a height of 22m. The supporting structure is a column, inside of which there are two gas outlet shafts ø600 (Sheet s=1,5 mm). Thermal insulation of flue gas shafts is provided with Rockwool mineral wool (Paroc is acceptable). The thickness of the thermal insulation is determined from the condition of the outer temperature of the insulation not higher than +40 °C. Gas outlet shafts are made of austenitic grade steel (08(12)X18H10T according to GOST 5582-75), which allows them to be used in aggressive environments. The gas ducts are fastened to the supporting structure by means of clamps with a pitch of 2,0 m, which are installed under the thermal insulation directly on the flue gas outlet. To ensure the necessary noise characteristics of the chimney, mufflers are provided in the design. Wind area II (30 kgf / sq.m.) according to SNIP 2.01.07-85; Maximum flue gas temperature +190 °C; The metal structures of the chimney are designed in accordance with the requirements of SNIP II-23-81 "Metal Structures", SNiP 2.01.07-85 "Loads and Impacts". This is confirmed by the certificate of conformity ROSS RU.АИ83.В00856 The main architectural solutions are presented in the drawings of the AS brand.

Constructive decisions

The design of the boiler house is a factory-made mobile container-type building AKM "Signal 6500". The constructive scheme of the boiler house is frame-bonded. Frame - steel, assembled from four modules. Steel C245. The modules are single-pitched, 3,5 m wide, 9 and 8 m long, with support frames resting on the foundation and welded to the foundation embedded parts. The outer walls are made of sandwich panels with a thickness of 100 mm vertically mounted. Columns - from bent-welded profiles of closed section. The support frame is made of rolled channel. Overlapping - plywood on galvanized steel sheet and a system of cross beams from rolled channels and I-beams and spacers from rolled angles. The covering is made of sandwich panels with a thickness of 100 mm on a system of cross beams from rolled channels. The spatial rigidity and stability of the building is ensured by the joint work of the frame, vertical stiffening ties in two directions and horizontal stiffening ties in the coating. The design of the pipe is not included in the project documentation. The foundation of the pipe is designed in accordance with the specified loads (N= 12,15 tf, M=17,7 tf.m, Q=1,2 tf). The level of responsibility of the boiler house building is 2 (normal). The mark of the floor of the boiler room, corresponding to the absolute mark of 0,000, was taken as 18.40. The foundations are designed from monolithic reinforced concrete on a natural basis on the basis of engineering and geological surveys. The foundation of the chimney is columnar, 1,75 m high (burrowing into the ground by 1,45 m) with plan dimensions of 4,3x4,3 m. The foundation is made of concrete B25, W6, F75 and working reinforcement A-III. The absolute mark of the base of the foundation is 16.45. The pressure under the base of the foundation is 2,81-5,51 tf/m2. The base of the foundation of the pipe is light silty semi-solid loam (IGE-3) with E = 120 kgf/cm2, jII= 22°, e = 0,683, IL= 0,22. The calculated soil resistance at the base of the chimney foundation is 28,7 tf/m2. The foundation of the boiler house building is a shallow ribbed slab (ribs up) of 200 mm thickness made of concrete B15, W6, F75 and working reinforcement A-III, with pits up to 2,2 m deep. Stiffeners - with a section of 200x400 mm (h, taking into account the thickness of the ) are designed along the perimeter of the slab and along the middle longitudinal axis. The absolute mark of the base of the foundation is 17.80. The stress at the base of the foundation slab is 1,71 tf/m2. Heaving soils at the base of the foundation of the boiler house building are replaced by a sand cushion 1,05 m thick of medium-density sand with a compaction factor. At the base of the sand cushion lie light silty semi-solid loam clay (IGE-3). Preparation for foundations - from a layer of monolithic concrete B7,5, 100 mm thick, under the foundation slab additionally along a layer of crushed stone 200 mm thick. Groundwater is revealed at a depth of 4,0 m at an absolute level 13.60. The maximum ground level is possible at the ground surface with the formation of an open mirror in low areas. Groundwater is non-aggressive towards concrete of normal permeability. The soils are slightly aggressive in terms of sulfate content in relation to concrete of normal permeability. To protect the building from dampness, and the foundations from the aggressiveness of soils, the foundations are designed from W6 concrete with coating of concrete surfaces in contact with the soil with bitumen-rubber mastic. To protect the basement of the boiler room from freezing, the ends of the foundation slab and the blind area along the perimeter of the building are insulated with a layer of foam plastic 50 mm thick. Foundation calculations were made using the Foundation program. Chimney foundation settlement - 0,5 cm, compressible depth - 1,2 m, boiler house foundation settlement - 0,34 cm. The boiler house is designed in a complex building block at a distance of 8 m from a residential building. Due to the low settlement of the boiler building and the foundation of the chimney, the construction is envisaged without any negative impact on the neighboring residential building. The design solutions for the main load-bearing structures are taken reasonably, confirmed by calculations, comply with the requirements of the current regulatory and technical documents and can provide conditions for normal operation.