Architectural and space-planning solutions

The reconstructed non-residential building of the former secondary school is located on a land plot that does not belong to the category of historical and cultural land, and is located outside the protection zones of cultural heritage sites. The building is located on the intra-quarter territory, indented from the "red" line of the street. The building was built in the 1950s-60s of the XX century, brick, 3-storey, with a technical underground and an attic, U-shaped in plan. The main facade is oriented to the street. The project documentation provides for the reconstruction of the building to accommodate justices of the peace, including: redevelopment with the preservation of existing walls, with the dismantling of frame partitions, window and door fillings, floor structures, ceilings, roofs; construction of an extension with dimensions of 16,2 x 12,7 (m) to the central part of the building from the courtyard area with a ledge beyond the line of the main building by 4,0 m; building superstructure with one (fourth floor). The reconstructed building - with dimensions in the axes 36,95 x 24,11 (m), with a maximum height of the building from the ground level to the top of the roof 16,42 m. The height of the technical basement from the floor to the bottom of the protruding structures is from 1,79 m to 2,24 m. The height of the first, second, third floors is 3,88 m, the fourth - 3,93 m. The architectural solution of the facade was designed taking into account the preservation of the style and the unified architectural solution of the existing building and the built-on and attached parts. The outer walls of the extension and superstructure are made of brick, insulated from the outside with mineral wool boards, followed by finishing. Existing external brick walls are sheathed with plasterboard sheets on a metal frame with mineral wool insulation from the inside - to preserve the architectural design of the facade. The main entrance to the building is designed from the side of the main facade. The technical basement is provided for the laying of engineering networks and technical premises: ventilation chambers, a heating center, a water meter unit. The entrance to the technical basement is designed by stairs in the outer pit. The planning solution of the above-ground floors was designed taking into account the technological requirements for buildings of this profile, according to the design assignment. The following premises are located on the ground floor: four courtrooms, deliberations, archives, security premises, offices for justices of the peace, an office, a block of premises for defendants and an escort, auxiliary premises, service and technical premises. On the second, third, fourth floors, five courtrooms, deliberations, sanitary facilities, an archive, a server room (on the second floor), offices for magistrates, office premises, a rest and eating room, a room for storing material evidence, rooms for familiarization with the case materials (on the third and fourth floors), auxiliary premises and cleaning equipment. The connection between the floors is designed by two staircases of the L1 type and using two elevators. The exit to the roof is designed from the staircase. Partitions - brick and plasterboard on a metal frame filled with a mineral plate, depending on the purpose of the premises. Ceilings - suspended. Interior decoration on evacuation routes - fireproof, certified materials, depending on the purpose of the premises. Elements of window fillings are metal-plastic blocks with double-glazed windows. The roof is flat, with an internal drain. The exterior finish of the facade is a plaster layer painted with moisture-resistant paints. Thermal protection of enclosing structures and filling elements is designed taking into account the requirements of SNiP 23.02.2003. Measures are envisaged to ensure the accessibility of the facility to people with limited mobility, including wheelchair users.

Structural and space-planning solutions

Surveys of the reconstructed building for the accommodation of justices of the peace have been completed. The constructive scheme of the building is column-wall with load-bearing brick walls and pillars. The building has not been used for more than 5 years. In 2005, as a result of a fire, the roof, the truss system (80%) and, partially, the ceilings above the 2nd and 3rd floors burned out. The category of technical condition has not been determined, since the survey revealed structures that are in emergency condition. The walls and pillars of the building are made of solid clay bricks on a lime-sand mortar. The thickness of the outer walls is 690 ... 1080 mm, the thickness of the inner walls is 390 ... 590 mm, the section of the pillars is (1140 ... 1310) x (640 ... 660) (mm). Estimated compressive strength of brickwork (at the level of the 1st and 2nd floors) - 1.61 MPa. Lintels over the openings - brick on reinforcing bars, metal and wood. As a result of the survey, defects in the construction of the walls were revealed: cracks in the brickwork of the outer walls with an opening width of up to 3 mm; loss of metal lintels of internal walls with the collapse of the brickwork of the walls in places of dismantled lintels; destructive destruction of brickwork and traces of blocking of wall structures. The stability of walls and piers in places of lost floors is not ensured. The condition of the walls and lintels is emergency. Ceiling above the basement - monolithic reinforced concrete slabs on steel beams, partially - wooden flooring on wooden beams. Interfloor floors - wooden flooring on wooden beams. The surviving sections of the floors are in disrepair and need to be replaced. Stairs (prefabricated concrete steps and reinforced concrete squares along metal stringers and beams) were lost at the time of the survey. Coating structures (wooden truss system) - lost. The foundations of the building - strip rubble on a natural foundation with a laying depth of 3,0 m from the ground - are in a satisfactory condition. A visual inspection of the foundation body did not reveal any traces indicating uneven deformations. The basis of the foundations are silty loamy ribbon fluid plastic EGE 2 (IL=0.90, E=70kg/cm2, e=0.952). Verification calculations found that the bearing capacity of the foundation soils is insufficient to absorb the loads from the building. The project documentation provides for the sequence of work. Construction and installation work on reconstruction is planned to begin after the elimination of accidents (ensuring the stability of walls and walls) and the dismantling of emergency floor structures. The design documentation provides for: reinforcement of existing foundations, expansion of the base of foundations by taking them into reinforced concrete clips and partial transplantation of foundations on a pile foundation. Piles - bored anchor, made according to the technology of the "TITAN", GSI type (rod section R 38N, pile pitch 1,5 - 2,0 m, length 8,0 m). At the base of the piles there are light silty loams with interlayers of hard plastic sandy loam EGE-4 (IL=0.34, E=12MPa, e=0,529). The design load on the piles is assumed to be 21,0 tf. Before the mass installation of piles, the project provides for the implementation of test piles; reinforcement of piers and pillars with the installation of steel clips from corners, sealing cracks in the walls by injecting cement mortar; installation of metal lintels to support the designed ceilings and over new openings; installation of interfloor floors from monolithic reinforced concrete, concrete B20 100 mm thick along the lower shelves of steel beams; installation of stairs from prefabricated reinforced concrete steps and monolithic reinforced concrete platforms along steel stringers and beams; dismantling of external walls to the level of window openings on the 3rd floor with the installation of a monolithic belt 200 mm thick, followed by restoration with hollow brick masonry 250 mm thick with a layer of insulation and a facing layer of brick 120 mm thick; dismantling of porch structures with a canopy. The structures of the newly designed canopy are box section steel studs and cover beams. Covering - profiled flooring. Strip foundation and porch slab - from monolithic reinforced concrete (concrete B20, W6, F75); installation of a pre-trial detention cell made of monolithic reinforced concrete, concrete B20, at the level of the technical underground and the first floor (wall thickness - 150 mm, ceiling - 200 mm, coating - 100 mm); lowering the floor of the technical underground with the installation of a floor base made of monolithic reinforced concrete 200 mm thick (concrete B20, W8) for crushed stone preparation 200 mm thick; insulation of the outer walls of the building with Rockwool insulation 100 mm thick on the inside. An add-on of the 4th floor of the existing building is provided. Built-on external walls - from hollow brick M100 on mortar M150 250 mm thick, with pilasters with a section of 380x380 (mm) with a layer of insulation and, up to the level of window openings on the 4th floor, with brick cladding 120 mm thick, above - plastered over the grid. The internal walls are made of hollow brick M100 on mortar M150, 250 mm thick. Coating - profiled decking on steel beams of the I-section coating. The extension to the existing building is separated by a sedimentary seam and designed in brick walls with monolithic reinforced concrete beam ceilings. External walls - 380 mm thick with mineral wool insulation 100 mm thick, wall along the D axis - 250 mm thick, load-bearing internal wall - 510 mm thick. Brick - solid, brand M150 on a solution of brand 100 with reinforcement according to the calculation. Walls and coating of elevator shafts - from monolithic reinforced concrete 200 mm thick, concrete B25. The walls of the technical underground are made of monolithic reinforced concrete (concrete B20, W8, F75) with a thickness of 250 - 500 mm. Ceilings and coating - slabs 160 mm thick on beams with a section of 300 x 400 (mm). The material of monolithic ceilings is concrete of class B20, reinforcement of class AIII. The foundation of the extension is a monolithic reinforced concrete slab 600 mm thick on a natural base. Fluid-plastic loams located at the base of the slab are removed and a cushion of medium-grained sand is made with support on sandy loamy silty plastic EGE 3 (ρ = 2,05 t/m3, φ = 21°, c = 0,19 kgf/cm2, E = 110 kgf/cm2). Foundation slab material - class B20, F75, W8 concrete, class AIII reinforcement. In order to reduce the impact of the designed extension on the existing building in the adjoining zone, a disengaging sheet pile wall made of a steel non-removable sheet pile, immersed by the indentation method, is provided. The relative elevation of 0,000 corresponds to the absolute elevation of 6.00 m. The calculation of the extension structures was carried out using the SCAD 11.1 software package. The expected draft of the projected extension is 2,6 cm. In order to protect underground structures from groundwater, internal and external coating waterproofing is provided.