Architectural and space-planning solutions

The designed building of the electrical substation of 220 kV substation with line entries is a 1-2-3-storey building with plan dimensions of 54.280 x 30.840 m and a height of 18.865 m to the ridge. The housing is solved with a cable cellar and an attic. On the floors of the building, the project provides for: in the cable basement - cable compartments and fire extinguishing pumps; on the first floor - chambers of transformers and current-limiting reactors, GIS-220 kV room, RU-6(10) kV and RU-10 kV rooms; on the second floor - room SCHPT-1 and SCHSN-1, room SCHPT-2 and SCHSN-2, ventilation chambers, battery room, acid room, storerooms; on the third floor - relay boards T1 and T2, rooms for automated control systems, relay protection and automation equipment, SDU, ACS, an office for the head of the substation, rooms for field teams and for meals, bathrooms with showers. The roof of the body is made of profiled steel sheet with a plastic coating, the drain is external. Exterior finish of the building - plastering of three-layer sandwich panels and a reinforced concrete plinth, followed by painting.

Structural and space-planning solutions

Responsibility level – II, normal. The project provides for the construction of a substation building, semi-underground fire water storage tanks, an oil collector and a fence around the substation territory. The substation building was designed in monolithic reinforced concrete structures made of class B30 concrete, according to a frame structural scheme with floor hard disks. The basement walls are monolithic reinforced concrete made of B30, F150, W6 class concrete with a thickness of 300 mm. The columns are taken with a section of 300 x 300 mm, the spacing of the columns is irregular, 3,0 ÷ 7,5 x 3,0 ÷ 6,0 m. Ceilings with a thickness of 120 and 140 mm, above the basement - 200 mm, along beams with a section of 300 x 300 ÷ 700 (H) mm. Stairs - prefabricated reinforced concrete steps on metal stringers and monolithic platforms. The building is equipped with crane-beams with a lifting capacity of 5 tons and monorails with a lifting capacity of 2 tons. Crane tracks rest on the consoles of the columns, the monorails are suspended from the reinforced concrete beams of the frame. The outer walls of the building are non-bearing, made of three-layer hinged wall sandwich panels 150 mm thick. The panels are fastened to the reinforced concrete frame of the building using self-tapping bolts according to the standard solutions of the supplier. Connection of a sandwich panels among themselves - grooving. The outer walls of the transformer rooms are designed from aerated concrete blocks of class B3,0; D600; F75. The internal walls of the building are made of aerated concrete blocks 300 and 200 mm thick. Walls made of aerated concrete blocks are connected to the frame columns using anchors with anti-corrosion coating. Spatial rigidity and stability of the building is ensured by rigid connections of columns and floor beams. The roof of the building is designed in steel structures. The constructive scheme of the coating is bonded. The beams are designed from rolled profiles of steel grades C235, C245 and C255. The profiled flooring is laid along the girders with a step of 1,2÷2,4 m. The stability of the roof structures is ensured by installing ties from square tubular profiles and fixing the profiled flooring with self-tapping bolts in each wave. The calculation of the building structures was performed using the LIRA9.4 computer complex. The relative elevation of 0,000 corresponds to the absolute elevation of 3,700m. Fire water reservoirs - semi-underground, on a natural base, with walls 300 mm thick and a bottom 200 mm thick made of monolithic reinforced concrete of class B25, F150, W8. The ceiling is made of prefabricated reinforced concrete ribbed slabs 300 mm thick. The project provides for the installation of an underground oil collector with walls and a bottom 300 mm thick made of monolithic reinforced concrete of class B20, F100, W6. The covering is made of monolithic reinforced concrete with a thickness of 250 mm. Waterproofing of surfaces in contact with the ground - pasting. The fence of the territory of the substation is provided from prefabricated reinforced concrete structures 2,5 m high. The fence has an upper additional fence in the form of a spiral security barrier "Egoza". The foundations are tape on a natural basis. The foundations are designed in accordance with engineering and geological surveys carried out at the construction site. The foundations of the substation building are monolithic reinforced concrete, made of B30, F150, W6 class concrete on a natural base. Under the columns - free-standing columnar foundations, under the walls - strip foundations, in the basement area - in the form of a slab 400 mm thick, with local thickenings for columns up to 500 mm, with coffer-type walls. Under the foundations, the project provides for the installation of a sand cushion of medium-grained sand instead of soft-plastic dusty sandy loam. At the base of the pillow lie silty hard plastic and hard sandy loam. The expected average settlement is 2,0 cm. Under all foundations, concrete preparation is provided from concrete of class B7,5 with a thickness of 100 mm. The groundwater level was recorded at a depth of 1,0-2,0 m from the earth's surface. The maximum position of the groundwater level in unfavorable periods is near the surface of the earth. Groundwater is moderately aggressive in terms of the content of aggressive carbon dioxide and slightly aggressive in terms of the content of sulfates in relation to concrete of normal permeability. The project provides for waterproofing of the basement walls and foundation slab, the use of low permeability concrete. The normative depth of soil freezing is 1,45 m. The project provides for the insulation of the basement walls with extruded polystyrene foam 50 mm thick.