Constructive decisions

Structural and space-planning solutions: Structural scheme of a two-section panel residential building - a cross-wall system with load-bearing internal transverse and longitudinal walls and with hinged longitudinal external walls. The building was designed from products manufactured by ZAO DSK BLOK. The basement and first floor structures are made of monolithic reinforced concrete. Concrete B25, W6 (in the basement W8), F100 reinforcement class A500C. The outer walls of the basement and the first floor are made of monolithic reinforced concrete 250 mm thick, with insulation, above the blind area, finished with Melikon-Polar concrete stone 60 mm thick. The internal walls of the basement are made of monolithic reinforced concrete 200 mm thick. Internal walls of the 1st floor - from monolithic reinforced concrete 200 mm thick, in the area of ​​large-span openings - with pilasters, columns and beams. Ceiling over the basement and first floor - monolithic reinforced concrete slabs 200 mm thick. Non-bearing external walls of the second floor and above - reinforced concrete hinged panels made of B15, F50 concrete, 120 mm thick. The load-bearing outer walls of the second floor and above are prefabricated reinforced concrete panels (concrete B22,5 and B15, F50) with a thickness of 160 mm. Prefabricated panels of external walls - insulated with Rockwool slabs 200 mm thick and plastered with a thin layer of plaster, followed by painting. Fastening the insulation to reinforced concrete - plate-shaped dowels. The heat-insulating facade system adopted in the project documentation must be developed at the stage of "working documentation" and have the appropriate valid technical certificate of the Ministry of Regional Development of the Russian Federation. External walls of LLU - three-layer reinforced concrete panels with flexible connections, made of concrete B22,5, F75, W4, with a total thickness of 420 mm, with an outer layer 60 mm thick (concrete B22,5, F100, W4) with an average layer of insulation 200 mm thick and internal bearing layer 160 mm thick (concrete B22,5, F75). The outer end walls in the zone of the expansion joint are load-bearing three-layer reinforced concrete panels 420 mm thick. Concrete B22,5, F150. The inner walls of the second floor and above are prefabricated reinforced concrete panels 160 mm thick (concrete B22,5 and B15, reinforcement A400, A240, Vr-I). The pitch of the transverse walls is from 1,82 to 3,60 m. Partitions - prefabricated reinforced concrete panels (B15 concrete), 80 mm thick, made of brick - 120 mm thick. The lintels are prefabricated reinforced concrete. Ceilings - prefabricated reinforced concrete flat slabs 160 mm thick, rigidly connected to balconies (concrete B15, B22,5 reinforcement A400, A240). Balcony slabs - prefabricated reinforced concrete flat slabs 120 - 160 mm thick made of concrete B22,5, F75, with thermal breaks. Bay slabs - prefabricated reinforced concrete ribbed beam-type slabs with a rib height of 250 mm supported on reinforced concrete consoles. Covering - prefabricated reinforced concrete flat slabs 160 mm thick (concrete B15, F50). The connection of floor slabs to each other - by welding, by welding connecting plates or reinforcing ties to the hinges or embedded parts of the slabs. Sealing of seams - cement - sand mortar M200. Loggias and balconies - with structural glazing, with fastening of load-bearing structures to floor slabs. Elevator shafts - prefabricated reinforced concrete volumetric blocks with a wall thickness of 120 mm. Ventilation blocks - prefabricated reinforced concrete three-dimensional blocks, with floor-by-floor support on floor slabs. Sanitary cabins - prefabricated reinforced concrete panels 60 mm thick made of B25 concrete, 60 mm thick. Elements of stairs - prefabricated reinforced concrete marches and platforms made of concrete B25, F50. The horizontal joint of the load-bearing panels of the internal walls is platform, with the transfer of forces to the underlying panel through the floor slabs. The panels are mounted using vertical fixation elements (pin fixators) with the wall panel of the next floor (the pins were not taken into account in the shift calculation). Horizontal mortar joint - 20 mm thick, cement-sand mortar M200. The horizontal joint of the single-layer hinged panel of the outer walls is platform, with partial support on the floor slab (overhang - 30 mm). Horizontal joint - 20 mm thick without mortar. The vertical joint of the load-bearing panels of the internal walls - keyed joints and horizontal steel ties with the joints sealed with fine-grained concrete B15 and B22.5. Vertical concrete joint - 100 mm thick, mortar - 20 mm thick. The dowels of the side faces of the panels are 55 mm deep. Vertical junction of non-load-bearing facade panels with panels of internal walls - with fastening of panels with horizontal steel ties that perceive the pull-off force. All prefabricated structures are fastened together by welding connecting elements (plates - 8 and 6 mm thick, rolling corners - 140 x 90 x 8) to embedded parts with cement-sand mortar M200. The spatial rigidity and stability of the building sections is ensured by the joint work of the transverse and longitudinal walls in combination with floor disks. All prefabricated elements produced by CJSC DSK BLOK correspond to the loads of an individual residential building. The insulation is attached to the panels with dish-shaped dowels in accordance with the calculation. Calculations of prefabricated structures were performed by CJSC DSK Blok using the Lira software package v.9.4 by the method of equivalent replacements, taking into account: the pulsating component of the wind load; joint work of the above-ground part of the building and foundations, the calculation confirmed the stability of buildings from progressive destruction. The maximum values ​​of mutual shifts between walls and ceilings in the platform joint are 0,19 mm. The maximum values ​​of mutual shifts between the walls of the perpendicular direction are 0.015 mm, the horizontal displacement of the top of the building is 1,6 cm, the acceleration of floor oscillations is 0,07 m/s2, the stability factor is at least 10, which does not exceed the maximum allowable values. Calculations of monolithic structures were performed using the SCAD v.11.3 software package. The expected design settlement of the building will be 10,5-12,0 cm, the relative difference of the settlement is 0,00067. The level of responsibility of the building is the second (normal). The service life of the building is assumed to be at least 50 years. The mark of the floor of the first floor, corresponding to the absolute mark of 0,000, was taken as 8.15. The foundations were developed on the basis of engineering and geological surveys carried out at the construction site. The foundations are piled. Piles - prefabricated reinforced concrete, section 40 x 40 cm, composite, length 19 - 23 m, made of concrete B25, W8, F100 on sulfate-resistant Portland cement and class A-III reinforcement. The absolute mark of the pile tip is taken in accordance with the occurrence of the bearing layer and ranges from minus 13.00 to minus 17.00. The pile driving method is driving from the bottom of the pit. According to the results of static sounding, the design load on the piles is assumed to be 120 tf, which will be verified by static and dynamic tests. The connection of piles with grillage is rigid. The base of the piles is silty hard sandy loam (IGE14) with e = 0,461, E = 210 kgf/cm2, φII = 26°, IL = - 0,08. Grills - slabs of monolithic reinforced concrete with a thickness of 600 mm. Concrete B25, W6, F100, working reinforcement A500C. The absolute mark of the bottom of the grillages is 5.05. Preparation under grillages - a layer of monolithic concrete B15 100 mm thick over a layer of sand 300-500 mm thick. The maximum level of groundwater is at an absolute mark of 3.00.