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5RESTORATION OF THE TEMPERATURE AND HUMIDITY REGIME FROM THE SMALLEST ELEMENTS IN COMPLEX NODES IN CONIFEROUS
BUILDINGS RESEARCH
Shahobiddin Isomiddin o'g'li Xudoyorov
Master degree student of the department-construction of buildings and structures, Samarkand state institute of architecture and construction named after Mirzo Ulugbek of the ministry of construction of the republic of Uzbekistan
ABSTRACT
In the enclosing structures of modern buildings, it is difficult to distinguish a section within which the transfer of heat and moisture occurs according to a one-dimensional scheme [1]. The presence of inhomogeneous areas in fences in the form of corners of external walls, window slopes, structural connections, and interfaces of internal and external structures leads to the formation of complex three-dimensional temperature and humidity fields in them. The localization of moisture in these areas above the permissible values leads to a deterioration of the humidity regime, reducing the thermal protection and service life of the entire building. The forecast of temperature and humidity conditions in the edge zones of enclosing structures is important for ensuring sanitary and hygienic safety, energy efficiency and durability of fences.
Keywords: weather conditions, motor shaft, paint material
INTRODUCTION
The use of moist air as a reference in living complexes, whose properties are stable, increases the accuracy of determining the potential. If a wet body has an arbitrary temperature, then its absolute potential is equal to the absolute potential of the body that is in a state of non-isothermal humidity equilibrium with it and has a reference temperature.
The equation of moisture conductivity can be accepted without additional sources (drains) of moisture. The heat of phase transitions of moisture in the heat equation can also be ignored, since the contribution of this heat to the temperature field is comparable to the error due to the averaging of long-term climate data.
METHODOLOGY
The physical and mathematical model of joint non-stationary heat and moisture transfer for three-dimensional inhomogeneous sections of external fences of buildings of living complexes can be presented in the form of a system of nonlinear differential equations.
On the outside, the wall has a protective screen located on the ratio with the formation of an air layer, ventilated by outside air. The thickness of the air layer is 60 mm. To attach the screen to the brickwork, a sub-facing structure is used, consisting of brackets and vertical profiles made of galvanized steel. The thickness of the profiles is 2 mm. The bracket is fixed with a steel anchor bolt with a diameter of 12 mm and a length of 150 mm through a heat-insulating gasket.
The analysis of the humidity regime shows that the field of moisture content is homogeneous away from the bracket in living complexes. The placement of the bracket violates the uniformity of the humidity field. In the area where the bracket is attached to the brickwork, there is an increase in moisture content. The maximum moisture content of brickwork in this zone is 0.008 kg/kg (0.8% M), which is close to the maximum sorption content (0.009 kg/kg). A decrease in temperature and a decrease in the outflow of moisture in the area where the bracket is attached to the brickwork lead to a deterioration in the humidity regime.
DISCUSSION
To normalize the temperature and humidity conditions of attic rooms, as a rule, it is necessary to improve ventilation by installing various air vents. The cross-sectional area of dormer windows and air vents should be equal to or greater than 1/300 of the area of the attic room.
Exceptionally high corrosion resistance of M1 and M2 roofing sheet copper: It is advisable to use hot-rolled copper, which, unlike cold-rolled copper, is not coiled. The thickness of copper sheets is from 0.5 to 1.0 mm. The technology of the roof covering is identical to the technology of the roof device made of galvanized steel; however, given the low resistance of copper to mechanical loads, the crate should be made of solid boards with a thickness of 35 to 50 mm.
It is advisable to perform all metal elements of the roof from one or homogeneous metals (similar in electrode potential). When using dissimilar metals, when the roof covering and, for example, cranes, hooks, crutches are made of different metals with different electrode potentials; galvanic pairs are formed in the contact zone. Therefore, under the influence of atmospheric conditions, a metal with an increased positive potential will be subject to dissolution (corrosion). Therefore, contacts of dissimilar metals should be isolated.
RESULTS
Anti-corrosion coatings that do not contain cement, stone flour, sand and chalk are applied with aggregates. The viscosity of the VZ-4 viscometer for the 2600N unit with a particle size of up to 0.08 mm should not exceed 200 seconds, and for 7000N - 300 seconds. with a permissible particle size of up to 0.14 mm. The 2600N and 7000N units
operate according to the following principle. The rotation of the motor shaft by means of an eccentric (for 2600N) or a flywheel disk (for 7000N) is converted into a reciprocating motion of the piston, which transmits the movement to the pump membrane through the hydraulic fluid located in the hydraulic transmission cavities. During the reciprocating movement of the membrane, the paint material is sucked from the tank into the pump through the suction hose and this material is pumped through the high-pressure hose into the spray gun. When the material flows through the spray nozzle, it is crushed into the smallest drops that form into a flat torch. The spray pressure is changed by the pump pressure regulator, passing part of the oil from the piston cavity into the hydraulic transmission cavity. When the gun is closed, the pump supply stops, the movement of the diaphragm is suspended, and the pressure regulator with the electric motor running bypasses the oil inside the hydraulic system. When the bypass valve is open, the paint material is drained into the flow container.
During major repairs, work on the preparation and installation of roofing paintings should be carried out in the same ways as when installing a new roof. Only operations on preliminary removal (disassembly) of the old roof covering and partial replacement of elements of the truss system are added. When disassembling the roof, first unbend or cut off the ridge folds with scissors. To unbend the folds, use a bar-lapel or special tongs. The same tongs are used to seal the folds in tight places.
The nature of the technical inspection of the roof depends on the degree of wear and service life of the structures. To identify the technical condition, the degree of wear of the main structural elements and determine the type of necessary repairs, a general and detailed inspection of the roof is carried out. The general survey of the roof is carried out by the housing and maintenance office, the survey department of the design organization or the design and estimate office. During this examination, the structural scheme of the roof, coating materials, roof defects (leaks, freezing, ice, disturbed temperature and humidity conditions of the attic room, damage to structural elements, etc.), violations of the conditions of normal operation of roofs and attic rooms are identified.
It is necessary to note separately the high efficiency of the dry mix technology for the production of concretes and mortars with high water resistance. In contrast to the conventional technology of concrete preparation, it allows you to carefully select the granulometric composition of aggregates and fillers, which, together with the rational selection of the binder, ensures the production of concretes with high water resistance.
CONCLUSION
In addition to optimizing the composition and selection of components, an effective way to increase the water resistance of concrete is to modify it with chemical
SCIENTIFIC PROGRESS VOLUME 2 I ISSUE 1 I 2021
ISSN: 2181-1601
additives of various actions: plasticizing, expanding, compacting, hydrophobizing, etc. The introduction of additives can significantly increase the water resistance of concrete.
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