Structural solutions for an existing facility

This project is included in the standard project of an 8-storey four-section multi-apartment residential building of the II-29-04 / M19i series. Windows and balcony doors - wooden with paired bindings, opening inward. The building has two passenger elevators, a garbage chute with inlet valves across the floor. Garbage is unloaded from the waste bin. Sanitary units are designed in the form of voluminous sanitary cabins. Foundation - pile, tape, monolithic reinforced concrete slab. Expanded clay panels M-100. Foundation concrete blocks M-150. Foundation concrete pads M-250. Reinforced concrete panels M-200. Monolithic reinforced concrete grillage and M-250 slab. Reinforced concrete piles M-300. Masonry system: Concrete blocks - ordinary with dressing of seams; concrete - pouring concrete into the formwork. The foundations of the building have sufficient depth, are based on natural soils, and are in good condition in accordance with SP 13-102-2003. Asphalt blind areas have cracks, subsidence, there are gaps at the junction of the blind area to the walls of the building. The drain is internal, water is discharged onto the blind area and lawns. Unsatisfactory removal of surface water from the walls of the building. Small cracks in the basement, local violations of the plaster layer of the basement and walls. Cracks in the joints between blocks and panels, efflorescence and traces of moisture on the outer walls of the technical underground. The joints in the outer walls are sealed poorly, there are leaks along the joints. The points of inputs of engineering communications in the outer walls are sealed poorly. The floors of the technical underground have cracks, potholes, subsidence, stains from soaking. The outer and inner walls of the technical underground are brick and made of SB blocks with a thickness of 380-640 mm. The outer and inner walls of the 1st-8th floors are brick, with a thickness of 1 mm from the 3st to the 640rd floors, and 4 mm from the 8th to the 510th floors. There are ventilation ducts in the inner walls. The facades are lined with front brick with jointing. The plinth is plastered and painted. Interroom partitions panel plaster concrete 80 mm thick. Inter-apartment of two gypsum concrete partitions with an air gap with a total thickness of 200 mm. In bathrooms, partitions made of gypsum-cement-slag concrete panels with a thickness of 80 mm, partitions made of cinder-concrete blocks with a thickness of 90 mm can be used. There is no horizontal or vertical waterproofing. Column - withboron reinforced concrete columns of the K-12-56 type (3rd-8th floors) and K-18-56 (1st-2nd floors), KD-18-13 (basement) two-story with a constant section of 400x300x5593 (H) mm with consoles to support the crossbars, they are made to the entire height of the house. Perceive the load from the crossbars of the floors. The inspection did not reveal any defects that reduce the bearing capacity. The ceiling above the technical underground is made of prefabricated reinforced concrete ribbed floorings of the NRU type (thickness 220 mm), NRT (thickness 220 mm), in the area of ​​stairwells from multi-hollow floorings NU (thickness 220 mm) supported by load-bearing external longitudinal walls and prefabricated reinforced concrete crossbars of the type VR-36-6 with a section of 540x300 mm, R-24(28)-6 with a section of 540x300 mm, RD-32-6 with a section of 540x300 mm. Traces of leaks in the areas where the risers of the water supply and sewerage pass due to the unsatisfactory state of waterproofing in the bathrooms. Cracks in mortar sealing of interfaces with other structures and between floorings, as well as loss of mortar from rustications due to poor-quality sealing of joints. There are cracks in the protective layer of concrete of the lower planes of the floor decking, in some areas the concrete of the floor panels is destroyed. Ceilings above the 1st-8th floors are made of prefabricated reinforced concrete multi-hollow floorings of the NU, NT type, 800 and 1200 mm wide, supported by load-bearing longitudinal outer walls and prefabricated reinforced concrete crossbars of the VR-36-6 type with a section of 540x300 mm, R-24 (28) -6 with a section of 540x300 mm, RD-32-6 with a section of 540x300 mm. Traces of leaks in the areas where the risers of the water supply and sewerage pass due to the unsatisfactory state of waterproofing in the bathrooms. Cracks in the plaster sealing of interfaces with other structures and between floorings, loss of mortar from rustications due to poor-quality sealing of joints. There are cracks in the protective layer of concrete of the lower surfaces of the floor decks, in some areas the concrete of the floor decks is destroyed, the reinforcement is affected by corrosion. Insulation of the attic floor - filling of slag (sand) with a layer of 240 mm with a lime-cement screed 20 mm thick. Ptechnical underground oly - compacted soil with crushed stone thickness. 100 mm, in operated premises - cement for concrete preparation. Cement floors have potholes, cracks, destruction, subsidence. The floors at the level of the 1st floor are parquet, linoleum, in the dimensions of the bathrooms from metlakh tiles. The floors at the level of the 2-8th floor are parquet, linoleum (relin), in the dimensions of the bathrooms from metlakh tiles. Parquet floor coverings have abrasion, cracks, loss of individual rivets. Linoleum coatings have abrasion, damage, breaks. Ceramic floor coverings have abrasion, peeling tiles, potholes. Floors in the attic level of the screed. The floors have potholes, cracks, destruction. The balconies are made in the dimensions of the 3rd-8th floor from prefabricated reinforced concrete cantilever slabs. There are traces of leaks on the lower planes of the plates. Separate balcony slabs have broken concrete slabs, exposed reinforcement is corroded. The waterproofing of the slabs is made of two layers of roofing material. Coating of ceramic tiles. The coating of ceramic tile plates has cracks, delaminations. Balcony railings - a metal grill with a corrugated plastic screen. The metal fence is deformed and corroded in places. Screens are missing. Drains made of galvanized steel. Plums are corroded, deformed, absent in places. Two-flight stairs from prefabricated reinforced concrete platforms and solid marches. The interfloor platforms are made with holes for passing the waste chute shaft. Coils for heating the stairwells are laid in the thickness of the platform slabs. Floor coverings from metlakh tiles. The coating has abrasion in places, peeling of tiles. Reinforced concrete steps. Steps have chips, slight abrasion. Metal railing with wooden handrail. The railing grate and handrail have mechanical damage, but are missing in some areas. Roof with a cold semi-passage attic space. Ceiling above the attic from prefabricated reinforced concrete slabs of the PPs type, 85 mm thick, supported by BS-60-2 truss beams with a section of 150-250x300 mm. In the area of ​​staircases made of prefabricated reinforced concrete slabs of the PT type, 160 mm thick, supported by prefabricated reinforced concrete crossbars of the RV-46-25 type with a section of 380x300 mm. The roof is rolled with an internal drain. The roof has swellings, folds, stagnant zones, gaps, poor-quality adjunction to the protruding parts. The water intake funnels of the internal drain are littered, there are no caps. There are leaks through the roof in the areas of the apartments on the last floor, as well as on the landings. The parapet wall is brick with a concrete slab covering.  The doors to the attic and the roof are wooden paneled (sheathed with sheet steel). The condition is unsatisfactory. The canopies over the entrances to the entrances are made of prefabricated reinforced concrete slabs. The covering of plates is made of roofing felt on bituminous mastic with drains from galvanized steel. There are traces of soaking on the lower and end planes, there are no metal frames. The coverings of the porches of the entrances to the entrances are asphalt. Steps are concrete. The pavements are dented, the steps are chipped, and the gratings for wiping feet are partially missing. The pits for the descent into the basement are located on the side of the main (yard) facade, the walls are brick, the steps are reinforced concrete. The steps of the descents to the basement have chips, potholes, subsidence. The building has four single-pipe heating systems with lower distribution of supply and return lines, with a dead-end movement of the coolant. Heat supply is carried out from thermal networks. Cast-iron radiators of the “M-140АО” type were installed as heating devices in the living quarters, vertical registers made of pipes d2mm in the kitchens of the 8nd-70th floors, and heating platforms in the stairwells. There are non-heating of the heating devices of the upper floors. Part of the heating areas of the stairwells are disabled. The supply lines to the elevator units (control units) are made of black steel pipes laid above the basement floor. The supply and return lines of sectional wiring are laid under the basement ceiling. Significant external corrosion, welded fistulas are observed. The insulation of transit and supply lines has places of destruction. Risers and piping laid open. There is significant external corrosion on risers in the basement, replaced sections of risers and piping where fistulas have formed. Plug valves are installed as shutoff valves on the risers. Three-way valves are installed on the connections to the heating devices. There is a complete breakdown of the fittings, leaks through stuffing box seals. The building has a supply and exhaust ventilation system with natural air induction. The inflow of outside air is carried out through the vents and leaks in the porches of window fillings. Air removal is carried out through the kitchens and bathrooms through individual companion channels with bypasses through two floors into the prefabricated channels. Individual and prefabricated channels are brought out above the roof level. For ventilation. nodes under the ceiling of the bathrooms, horizontal air ducts made of thin-sheet galvanized steel are mounted, connected to the exhaust openings of individual ducts. There are crumples and leaks in the connections with the vent. gratings. In kitchens and bathrooms, individual exhaust ducts and horizontal air ducts are equipped with metal louvered grilles sized 200x200mm (in kitchens), 170x170 (in bathrooms). The grates are clogged with household soot, the blinds of most vents. gratings are in disrepair. Vertical individual and prefabricated ventilation ducts of kitchens and bathrooms are located in the brickwork of the internal walls. The channels are clogged, dusty. The ventilation shafts are made of brick. Metal umbrellas are installed over the mouths of the mines. External corrosion of umbrellas is observed.