The article analyzes the practical experience of regenerating the unique industrial environment of the industrial territories of large cities in Russia and Europe. The main methods of regeneration of a unique industrial environment are considered, depending on the degree of preservation of industrial function.

Keywords: regeneration, unique industrial environment, urban environment, industrial heritage, development of territories

In the settlement of Srednyaya Akhtuba, Sredneakhtubinsky district of the Volgograd region, a study was carried out to assess the specific pollution of the territory with aerosols. The main indicators of aerosol particles have been investigated: the number of particles (Np,%); particle diameter and fractional composition of particles (PM), mass fraction of particles (D (dp),%; specific density of particles (m0, μg / sq.cm). As a result of the studies, it was revealed that the specific pollution of the territory with aerosol particles in the working village ( rn) Average Akhtuba with an area of ​​2 sq. km, during the spring-summer season was 2.7 times higher (2.6938 tons) compared to the conditionally clean zone (0.997 tons). At the same time, the number of particles in fractions: PM0 -2.5 (26.97%) in Srednyaya Akhtuba, their values ​​were 1.5 times higher than in the conditionally clean zone PM0-2.5 (18.12%). Coarse dust was in the lead in the conditionally clean zone by 2.1 times : PM> 10 (29.85%) compared with particles from the rn Srednyaya Akhtuba RM> 10 (14.16%) The results indicate that the atmospheric air of the settlement Srednyaya Akhtuba is polluted and dusty with aerosol particles as compared to the conditionally clean zone At the same time, both in the conditionally clean zone and in the middle Akhtuba region, the same amount of finely dispersed dust (PM2.5-10), which requires clarification of the research results and the search for a possible natural source of pollution in the horticultural non-profit partnership (SNT). Also, the mass fraction of particles of the fraction (PM2.5-10) in the Srednyaya Akhtuba rn was higher compared to the conditionally clean zone, despite the same number of particles. The source of aerosols in Srednyaya Akhtuba can be both industrial enterprises of the construction industry located in Srednyaya Akhtuba, as well as a hidden source of natural pollution. Further research and comprehensive study of the area is required.

Keywords: aerosols; environmental monitoring, specific pollution; specific gravity of particles; environmental risks; atmospheric air; PM2.5; PM10; PM> 10

The article presents an assessment of dust collection equipment in terms of technological, economic, and operational characteristics. The criteria for this assessment and methods for calculating indicators that characterize the effectiveness of its use in the reconstruction of buildings carried out in cramped conditions of urban development are determined. The development of design solutions for the reconstruction of objects should not reduce the level of safety of builders and personnel of the reconstruction object, as well as cause damage to the environment, in particular, air pollution with dust particles from construction processes. The introduction of cost-effective means of combating atmospheric air pollution in design solutions, as well as the effective organization of construction production, which reduces the environmental burden on the territory, will allow the contractor to increase its competitive advantage when participating in tenders and determining the contract price for the reconstruction of buildings. The choice of cost-effective protective measures will save costs, subsequently determining the profit from the reconstruction of the building. The economic calculation given in the article allows you to determine the amount of operating costs in each individual case, and make a rational choice from the economic point of view of purchasing and using equipment in the course of work.

Keywords: environmental safety, environmental monitoring, atmospheric air protection, ecology in construction, dust suppression, feasibility study, dust collection systems, labor protection in construction

According to regulatory requirements, the Khakassia Republic is characterized by high seismicity, and therefore reliability and safety requirements are imposed on buildings and structures in accordance with SP 14.13330.2014 “Construction in seismic regions”. It is necessary to significantly reduce or eliminate the likelihood of an emergency, to ensure the necessary margin of safety and durability of buildings. It is possible to achieve such a multifaceted effect, including through the introduction of construction technologies using fiber-reinforced concrete. The experience of Russian and foreign researchers shows that the use of fiber-reinforced concrete in various structures makes it possible to achieve higher tensile strength, no shrinkage and resistance to cracking, as well as high impact strength and plasticity. In this regard, the study of the possibility of using fiber-reinforced concrete in the conditions of the Khakassia Republic is relevant. The purpose of this work is to study structures using fiber-reinforced concrete based on basalt fiber, which has increased strength, as well as to analyze the stress-strain state of models of various structures. The article presents the results of determining the optimal percentage of concrete reinforcement with basalt fiber based on the study of the kinetics of changes in strength in compression and bending. The paper presents the dependences of changes in strength and shrinkage deformations on the percentage of reinforcement. It is shown that concretes with 2% fiber content are characterized by the best performance. It is noted that an increase in the percentage of fiber reinforcement does not always lead to an increase in strength due to the uneven distribution of fiber throughout the volume. The authors investigated the stress-strain state of bending elements (slabs, beams) based on fiber-reinforced concrete. It is shown that when using basalt fiber, there is a decrease in the percentage of reinforcement with working reinforcement of reinforced concrete elements to 26–57 %.

Keywords: Fiber concrete, basalt fiber, percentage of reinforcement, bending element, shrinkage, deformation, stress-strain state, compressive strength, flexural strength, steel economy

A study of the operation of the water heating system of the Naryshkin bastion of the Peter and Paul Fortress was carried out. The results of measurements of temperature and relative humidity of indoor air are presented. Based on the research results, a three-dimensional model of room No. 3 of the Naryshkin Bastion was built, which was used in numerical modeling using the STAR-CCM + hydrodynamic computer complex. Recommendations for improving the heat and humidity regime are given, prospects for further research of the object are identified.

Keywords: object of historical and architectural heritage, microclimate parameters, water heating system, thermal regime, STAR-CCM +

The article is devoted to the issue of effective design solutions for shallow foundations. Options for optimizing standard designs of strip and columnar foundations are considered. A new configuration of the foundation with a stepped sole is proposed, which has a greater bearing capacity and less resource intensity. This effect is achieved due to a more uniform distribution of contact stresses along the base of the foundation and the accumulation of significant lateral friction. Due to the cross-sectional shape of such foundations, the volume of excavation and formwork is significantly reduced.

Keywords: foundation, construction, shallow foundation, strip foundation, column foundation, modified geometry, non-planar footing, soil mechanics, construction efficiency

The results of simulation of stabilization of landslide slope by method of finite elements are considered in the article. The slope stabilization system includes retaining reinforced concrete structures (newly erected and reconstructed) with an anchor support of the TITAN system.

Keywords: landslide, landslide slope, landslide circus, retaining structures, anchor support, anchor, mathematical modeling, geomechanical modeling, finite element method

The analysis of the results of large-scale experimental studies carried out at the Department of Reinforced Concrete and Stone Structures of DSTU is presented. It is aimed at determining the possibility of effective implementation of new composite materials in construction. This article deals with the issues of strength and stiffness of bending reinforced concrete elements with internal working reinforcement made of composite materials, or reinforced with external glass and carbon fiber reinforcement. The possibility of using coal and fiberglass working reinforcement for conventional bending elements in which the value of the maximum permissible deflections is not decisive has been established. The high efficiency of external reinforcement when reinforcing reinforced concrete structures with composite materials has also been proven.

Keywords: concrete, reinforced concrete, composite materials, reinforcement, concrete, strength, deformability

This article discusses the use of local additives and waste for the production of building materials and products. This topic is very relevant at the present time, since a large amount of waste has been collected all over the world, which occupies huge areas of fertile land and pollutes the environment around us, and we also considered the issue of increasing the quality of concrete by chemicalization.

Keywords: construction, building materials, waste, additives, environmental pollution, ecology, new technology

Analysis and comparison of Russian and European standards for mechanical strength of windows, such as resistance to racking and static torsion, are provided. Classification of mechanical properties of windows according to EN 13115:2020, normative characteristics of resistance to static loads according to GOST 23166-99 and recommendations of Quality Assurance Association for Windows and Doors (Germany) are compared. Russian requirements for resistance to racking are higher than 4th class, but for resistance to static torsion are lower than 2nd class of EN 13115, while 3rd class is recommended as minimum by German RAL-Association. Analysis of methodology for mechanical tests in accordance with GOST 24033-2018 and GOST 24033-80 is done. Concluded that refinement of methodology and criteria for determining test results with taking into account the provisions of European standards is necessary, as well as conduction of further research in the field of influence of mechanical strength of windows on other qualities, such as air permeability.

Keywords: window, translucent structure, enclosing structure, standardization, standard, mechanical strength, racking, static torsion

The article is devoted about the importance and urgency of the problem of reconstruction of healthcare facilities, since hospitals, like other forms of ownership, accumulate moral and physical deterioration and need periodic repairs or full-scale reconstruction. In our country, it is not uncommon for a hospital to be a dilapidated building whose service life is coming to an end. That is why in our days the issue of full-scale reconstruction of healthcare facilities is so acute. The Ministry of Health of the Russian Federation has developed a number of measures, thanks to which, according to Rosstat, more than 10 thousand hospitals will be repaired by 2024. The authors of the article make a comprehensive assessment of maternity hospitals in Rostov-on-Don, show their layout and fertility chart. The following is an example of the reconstruction of the observational building of the MBUZ. In the conclusion, the results are summed up and the measures that need to be taken for the comfortable stay of people in the hospitals of our country are determined.

Keywords: reconstruction, healthcare, operation, buildings of medical institutions

In modern construction, the task of improving the energy efficiency of urban-type buildings is becoming increasingly important, since urbanization increases the volume of energy consumption. When solving issues of energy efficiency of high-rise buildings, it is necessary to take into account such factors as the location of the object, orientation to the cardinal points, functional purpose, volumetric-spatial and engineering solutions to save energy, reduce heat loss and create comfortable conditions inside buildings and in the local area ... In part, these problems can be solved by optimizing the geometric, technical, including the heat engineering parameters of the building envelope, paying attention to the fact that their characteristics must be changed depending on specific climatic factors. The article analyzes several high-rise buildings in the city of Moscow. As an example, calculations have been performed and graphs of temperature and wind speed changes along the height of one of the buildings are presented. An increase in wind speed and a decrease in temperature create special conditions that affect the heat loss of high-rise buildings, which must be taken into account when thermal protection of external enclosing structures.

Keywords: wind, buildings, structures, landscaping, space, climate, region, analysis, landscape, aeration, ecology

The work was carried out due to the fact that the regulatory documents used in the design of structures operating at elevated and high temperatures do not take into account the peculiarities of the mineral composition and structure of concrete aggregates. This is a disadvantage of these documents, since the mineral composition and structure of aggregates can differ significantly even for materials of the same name, which can significantly affect the thermal changes in concrete. Due to the impossibility of experimentally investigating all the variety of concretes based on aggregates of various mineral composition and structure, a computational and analytical study was carried out in the work on the basis of existing methods for the analytical determination of thermal changes in concretes and their components. On the basis of these methods, the effect on the thermal expansion of concretes of the presence and amount in the aggregates of the most expanding minerals (aragonite, calcite, quartz, cristobalite, potassium feldspars, pyroxenes) and glass, as well as the average size of crystals composing mineral fillers, has been calculated and investigated. Considered are heavy Portland cement concretes on aggregates of limestone, dolomite, granite, syenite, diorite, basalt, diabase, broken clay brick, chamotte and slags. Based on the calculations, it has been established that the values of the thermal change in the volume of concrete, determined according to the normative document SP 27.13330.2017, coincide with the calculated values only for certain combinations of the mineral composition and structure of aggregates in terms of crystal sizes. In other cases, the actual thermal expansion of concrete may be less and more than the values obtained according to SP 27.13330.2017. The regularities of the influence on the thermal expansion of concrete of the content of various minerals and the average size of the crystals of minerals in the aggregates are established.

Keywords: thermal expansion, conventional and heat-resistant concretes, aggregates, minerals, glass, the effect of the mineral composition and structure of aggregates

The use of adhesive joints for reinforcing elements of steel structures is discussed. Adhesive joints provide the least costly way of joining elements of any material without disturbing their structure. Of particular interest is the reinforcement of structures in stretched zones using high-strength fibers such as glass and carbon fibers, as well as polymers reinforced with them. The main problem in this case lies in the peculiarities of the distribution of shear forces along the length of the adhesive layer. The article discusses a way to solve this issue.

Keywords: adhesive bond, adhesive layer, shear strength, analytical solution, finite element method, high strength fiber, carbon fiber, glass fiber

Against the background of the explosive development of modern technologies and methods of construction, the use of innovative structural materials, the growing volume of information about construction production, the complexity and uniqueness of projects, and given the low tendency for retraining of personnel and the insufficient competence of the labor force involved in the production of work, the issue of the quality of construction assembly work (CMP). The applied methods of organizing construction control according to the existing and slightly modified methods of the 80-90s of the XX century do not provide the necessary level of control of construction and installation work. Given the relevance of this problem, the question arises of the need to ensure high-quality and effective construction control to exclude the facts of violation of the production technology, prevent a decrease in the operational characteristics of the building, minimize the cost of eliminating errors, etc. Using comparative, statistical methods of research, analysis and modeling of mechanisms used by engineers of construction control of Russian and foreign construction organizations, the need for implementation was justified and a method of construction control based on modern achievements in engineering and technology was proposed, in particular, the use of building information modeling (BIM) and virtual reality (Virtual Reality, VR) technologies in the relationship, which allows to increase the efficiency of construction production and control, optimize the time for analysis and management decision-making, reduce the likelihood of violations on construction sites that affect the implementation period, cost and quality of the project.

Keywords: construction control, building information modeling (BIM) technologies, virtual reality (VR), construction project life cycle, 3D-model

This article describes the methods used to improve the management of construction design; the difference between the traditional and modern method, the problems encountered by the design at the time of execution, their consequences but also the importance of modeling building information and automating design processes as an effective method of improving organizational and technological management processes of designing a residential building.

Keywords: construction design, collaboration, cooperation, coordination, design processes, design managers, improvement, productive, controlling, quality, asynchronous, synchronous