With the right approach, the heat generated by chillers in an indoor ice rink can be used to melt ice, a dehydration system, or to heat a concrete pad under a layer of ice. In this way, energy can be saved. For the purpose of accumulation and subsequent distribution of thermal energy in the building, a reservoir that accumulates heat can be used. Heat is removed from the chiller condenser by a water cooling circuit, which is connected to the coil of an indirect heating boiler (heat accumulator). The coil heats the water that circulates in the heating circuit. Since the load on the ice can change during the day, heat extraction will occur in different amounts. For efficient transfer of thermal energy from one heat exchanger to another, it is necessary to control the speed of rotation of the pump impeller so that the controlled function is maximum. If the speed is insufficient, then the heat exchange flow will receive less heat. On the contrary, if the drive drives antifreeze too quickly, then the coolant will not have time to heat up. A mathematical model of the system was compiled from a plant condenser and a boiler with heated water, a dependence on the speed of the coolant (antifreeze) and the temperature difference at the inlet and outlet of the accumulator was revealed.

Keywords: heat accumulator, temperature control, shell-and-tube heat exchanger, optimal regulator, freon

The article discusses a new type of reinforced concrete columns with local prestressing of reinforcement. Such elements can be used for high flexibilities and eccentricities of the longitudinal force, for example, in the construction of industrial buildings. The derivation of resolving equations for determining the stress-strain state of the structures under consideration at the stage of prestressing is presented. Equations are obtained for calculating the level of prestresses in reinforcement, at which technological cracks are formed, expressions for determining stresses in concrete and reinforcement, as well as the deflection of the column at the manufacturing stage. The calculation algorithms are implemented numerically in the MATLAB environment. A comparison of the calculation by the author's method with finite element modeling in the LIRA software package in a three-dimensional setting is presented, taking into account the physical nonlinearity of concrete.

Keywords: reinforced concrete, columns, prestressing, stress-strain state, reinforcement, manufacturing stage, technological cracks, deflection

The researches results of the fuel ash waste’s and grain crops straw’s influence on the properties of the producing expanded clay gravel are presented in the paper. These wastes were used as auxiliary additives in the raw combination. The optimal composition of the raw combination has been established in the laboratory, for which physical and mechanical characteristics of the samples, including water absorption, compressive strength, bulk density, were analyzed. Characteristics of the expanded clay gravel samples are compared with the state standards requirements. It was found, that the addition 5% fuel ash and 1.5% crop waste (grain straw) ensures optimal swelling of the combination and high strength characteristics of the finished product.

Keywords: expanded clay, fuel ash, waste of crop production, swelling, construction materials, porosity.

The main elements of the system of external reinforcement of bent reinforced concrete structures are fabrics and lamellas. Fabrics and lamellas are glued to the surface of building structures in a polymer matrix. The matrix provides adhesion of the reinforcing filler with the reinforced structure. The price of reinforcement with carbon lamellas is several times higher than for reinforcement with carbon fabric. The article shows a comparison of proposals on the market of building materials for the reinforcement of reinforced concrete structures with lamellas based on carbon fibers. On the example of a reinforced concrete beam of four types of cross-section, a comparative analysis of the selected reinforcement systems under different temperature conditions was carried out, a conditional utility coefficient was identified, showing the ratio of price to the percentage reinforcement of the structure. The results obtained can be used to select the most cost-effective composite reinforcement system.

Keywords: reinforced concrete beams; strengthening; composite material; carbon lamellas; external reinforcement; operating temperature

The analysis carried out in the article showed that the sacred architecture of Ingushetia is represented not by separate objects, but by sacred complexes, which always include three objects of worship, corresponding to the triune deity appearing in three persons: the main male deity, the secondary male deity and the female deity. The second conclusion related to the first, all sacred complexes of Ingushetia can be attributed to Christian architecture. Four groups of sacred complexes were identified: the temple of Thaba-Erda, general atronymic significance, patronymic significance, generic complexes. The last two groups are discussed in detail. It was revealed that sacred complexes reflect the processes of nativization of Christianity, both in the interaction of Christian and pagan mythology, and in the deification of the nature of a particular place. The architecture of each object individually may seem primitive, but the architecture of the entire complex as a whole, including the path from object to object, views of the surrounding space of mountains and gorges, a system of sacred trees and stones along this path, the movement of the sun is a unique phenomenon.

Keywords: medieval architecture of Ingushetia, sacred complexes, traditional cultures, nativization of Christian culture

As part of the study, the problem of developing the peripheral territories of the St. Petersburg agglomeration according to the existing monocentric model will be raised. On the example of the territory of one of the settlements currently being developed in the peripheral zone of the agglomeration (the village of Novosaratovka), the potentials ("vectors") of its development will be identified and strategies for its development according to the polycentric model will be proposed, with the formation of a general strategy for the development of the settlement with the prospect of applying it to similar " new" territories.

Keywords: St. Petersburg agglomeration, polycentric model, “dormitory” areas, peripheral territories, Novosaratovka village, ecological, socio-cultural, public and business potential, “vectors” of development, territory development strategy, support center

The article deals with the distribution of fine dust in the atmospheric air of roadside areas of cities with a linear configuration, factors affecting its concentration in the roadside area.

Keywords: fine dust, roadside areas, road transport, wind speed, meteorological parameters

The lack of water resources determines the problem of their rationing. Existing water consumption standards provide for a wide range of daily consumption values. This does not take into account possible measures to save water, provided for by the concept of buildings with a zero balance of water consumption. In addition, the technical specifications for the design of water supply systems include, for economic reasons, the smallest possible number of residents. The actual occupancy may exceed the planned one by several times, which requires further investment of additional funds already in the reconstruction of the newly built network. The objective of the study is to develop an analytical model of water consumption, the analysis of which allows us to evaluate the dynamics of changes in the specific water consumption with a variable population.

Keywords: specific water consumption, indifference curves, resource replacement rates, marginal water consumption

To consider the possibility of saving resources from the introduction of an automated process control system (APCS) of a boiler plant with plasma ignition of coal for increased efficiency in the conditions of the Far North. To investigate automated control systems for boiler installations with various options for preparing coal for plasma ignition of the boiler, to consider their main advantages and disadvantages. To substantiate the need for the introduction of automated process control systems of a boiler plant of increased efficiency. Based on the literature review and the results of the calculation of economic efficiency, to develop a plan for the implementation of an automated control system of a boiler plant of increased efficiency for the conditions of the far north.

Keywords: energy resources, power engineering, boiler plant, automated control system

As practice has shown, enterprises that receive high profits achieve this by reducing costs, rather than increasing the price of products. The national project "Labor Productivity and Employment Support" defines one of the directions for achieving high labor productivity and product competitiveness as training in lean production tools. The article discusses the applied methods of lean production on the example of an architectural and artistic casting enterprise, and also shows the main indicators for evaluating the efficiency of using production capacities.

Keywords: efficiency of equipment operation, ITS index, lean manufacturing methods, Pareto analysis

Due to the increasing pace of construction and overhaul of roads, there is a need to introduce more economical and efficient technologies. One of such technologies is soil stabilization. Based on the study of various scientific literature and project documentation, typical soils of the foundation and roadbed of the Kirov region have been established, and their features have been identified. During the study of the soils of the region, several dangerous geological processes were discovered that affect the operation and construction of roads. The article analyzes various methods and techniques of stabilization of heaving soils, as well as possible design solutions for the construction of a layer of modified soil. In addition, the mechanisms by which stabilization is carried out and cases of their application were given. In the course of the study, the main types of stabilizing additives, their features and principle of operation were considered. In order to identify the degree of influence of various binders on the technological sequence of construction, variants of schemes for the production of work on soil reinforcement are presented, depending on their types. According to the results of the study, it was concluded that the stabilization technology is one of the most modern, efficient and cost-effective and provides various advantages in comparison with other alternative methods of strengthening of heaving soils. The relevance of this method for the Kirov region is also proved.

Keywords: road, construction, technology, stabilization, soils, additives, recycler, binders, soil cement, heaving, strengthening

One of the main socio-economic tasks of the Rostov region is the development of the construction complex. The construction complex affects the interests of the majority of residents of our country and is one of the most important sectors of the country's economy.

Keywords: construction complex, comprehensive assessment of the territory, subject of the Russian Federation, territorial planning, Rostov region"

The object of the research is the method of cutting tool wear control that provides evaluation of the periodicity of cutting tool replacement on the basis of vibration signals. Noise and vibration meter VShV-003-M2 is used for registration of vibration level in the process of parts processing. A procedure of determining the index of catastrophic cutting tool wear according to the vibration index with the use of the autocorrelation function and the amplitude-frequency characteristics of the dynamic system is developed. Measurements of vibration readings of a batch of parts in wave-file format were made, by processing the readings an array of data - vibration indicators, allowing to estimate the process of the cutter wear development during the machining process was obtained. Providing control of catastrophic wear of cutting tools is necessary for timely replacement of cutting inserts.

Keywords: vibration index, catastrophic wear, tool, condition monitoring, vibration, turning machine, sensor

This article contains the results of a study of the strength characteristics of building mortars of various compositions based on magnesia binder (magnesia oxychloride cement). The results obtained: the final compressive strength (28-day) within the studied compositions is from 12 to 45 MPa, the kinetics (rate) of strength growth on the first day of hardening is from 22 to 38%, on the third day of hardening – 33-68%, on the seventh day – from 50-88%, and about 120% from the design (28-day) with further hardening.

Keywords: magnesia oxychloride cement, magnesia binder, magnesia mortar, magnesia concrete, caustic magnesite, magnesium chloride, compressive strength, strength set kinetics

When clearing territories for the construction and / or subsequent maintenance of such infrastructure facilities as construction sites, airfield territories, right-of-way for roads and railways, heat supply routes, and so on, work is often carried out to remove growing undesirable tree and shrub vegetation, At the same time, the problem of assessing the quality of the performance of these works is relevant. The authors of the article consider the issues of mathematical modeling for assessing the quality and effectiveness of the work performed to clear the territories of a number of the above infrastructure facilities, give the boundary values ​​of the criteria for assessing the quality of the measures taken to remove vegetation, and formulate a conclusion about the advantages of the developed mathematical model.

Keywords: territory, unwanted vegetation, removal, efficiency, quality, criteria, evaluation