The paper presents the properties and nomenclature of products made of ceramic fiber used for insulating lining in steam reforming furnaces. On the example of the lining of the radiant chamber, the technology of mounting ceramic blankets on anchor studs, which is currently used in the construction and repair of reforming furnaces, is considered. The shortcomings of the existing technology are noted. These include the complexity of the process, the complexity of installation control and the high probability of uneven thermal conductivity of the lining surface due to hidden defects, as well as the spraying of ceramic fiber particles in the air that cause diseases. The nomenclature and technology of installation of insulating lining with ceramic blocks along guide tubes with subsequent resistance welding with the camera body is proposed. The technology will reduce the repair time, improve the thermal conductivity of the camera, reduce the risk of diseases.

Keywords: gas reforming, radiant chamber, insulation lining, ceramic fiber, thermal conductivity of the furnace

This article is devoted to the study of the effect of photocatalytic oxidation together with successive layers of sorbents (shungite, celite) on the efficiency of cleaning the supply air of premises from pollutants of motor vehicles. The studies were carried out with the help of a developed supply ventilation valve with air purification.

Keywords: intensity of ultraviolet radiation, shungite, zeolite, titanium dioxide, adsorption limit, supply air, ventilation valve

The active use in the production of building materials of waste after the renovation of housing is a relevant and promising direction. the load on logistics for the supply of inert materials is reduced, landfills and waste storage sites are being destroyed, and the cost of building materials from recycled materials is being reduced. The use of recycled clay bricks allows to solve the problem of solid waste disposal, but also to reduce the environmental damage caused to the environment by mankind from the excessive development of natural resources. Finely ground brick cullet has pozzolanic properties and can be used as an additive in a cement mixture, and a large fraction is used in aggregates of cement compositions.

Keywords: Сlay brick scrap, renovation, preparation, pozzolanic activity, hydraulic activity, binder, hardening, aggregate, mortar, strength

The increase in the population of large cities leads to the need for residential buildings, office space, leisure facilities, etc. leads to an increase in new construction. The city cannot constantly develop in terms of space as it is limited by the territory allocated to it in the framework of the cadastral division of the territory and it cannot grow indefinitely in breadth. That is why there are various programs for urban development, such as renovation, redevelopment of industrial areas and reconstruction of existing buildings. Also in recent years it has become popular to use different environmental standards in the design and construction of new or reconstructed buildings. This article will focus on the redevelopment of industrial areas with the development of underground space from the perspective of Fitwel ecological standard.

Keywords: Fitwel, green standard, redevelopment, industrial areas, renovation, industrial buildings, industrial facilities, new construction, development of underground space, integrated development of the territory

The article discusses the conceptual and practical areas of application of BIM-technologies when performing work on the inspection and restoration of buildings and structures affected by natural and man-made emergencies, as well as when modeling the consequences of natural disasters or man-made disasters. The methods of using BIM software systems in case of fires, earthquakes, floods, floods, as well as in organizing the evacuation of people and assessing damaged building structures are considered separately.

Keywords: emergencies, facility restoration, BIM technologies, man-made disasters, natural disasters, building surveys

The article is devoted to the analysis of sheet pile driving methods during the construction of a bank protection structure in dense urban areas. Four methods are considered in the paper: driving, vibration immersion (if necessary using leader drilling), indentation, vibroimpact. Comparative characteristics of the above methods of immersion are given. It is concluded that in conditions of dense urban development: a) the driving method is the least preferable, due to severe noise pollution and a negative impact on foundations near the work site; b) in the presence of dense soils, the methods of indentation or vibro-immersion are not suitable, and vibro-impact immersion should be used; c) in the presence of weak soils, it is possible to use both the indentation method and vibration immersion; d) in the conditions of a limited construction site, vibration immersion may be the best immersion method. The result of the work is the creation of a block diagram of the algorithm for choosing the method of piling for bank protection with heterogeneous soils.

Keywords: sheet piling, driving methods, leader drilling, bank protection, dense urban development.

Yemeni cities are distinguished by their ancient history and rich traditions in terms of the organization of urban recreation, which are not well studied and therefore are not used in modern city planning. The developed concept of the recreational framework of Sana'a was developed on the basis of data from a comprehensive system analysis of the planning structure of the city, the identification of the national identity of the Yemeni landscaping structure, the integration of climatic, dendrological and landscape conditions, as well as social factors influencing the organization of urban recreations of Sana'a. Based on the analysis data and identified architectural and planning opportunities, the key principles for organizing the "green" recreational frame of the city of Sana'a were proposed.

Keywords: urban planning, urban greening, sustainable development of the city, landscape design, urban environment, reconstruction

The article proposes a technique for optimizing trihedral lattice tower structures according to the criterion of minimum mass, taking into account limitations in strength, ultimate slenderness of elements, stability, and the absence of resonant vortex excitation. A lattice tower with a cross section of elements in the form of round pipes, consisting of two sections, is considered. The variable parameters are the width of the tower, the height of the lower section, the outer diameters of the cross-section of the chords and gratings, the number of panels in the lower and upper sections. The solution of the nonlinear optimization problem is performed in the MATLAB environment using the Global Optimization Toolbox package. Determination of forces in the tower and frequencies of natural oscillations is performed by the finite element method using the subroutine for MATLAB developed by the authors. The influences on the tower are ice and wind loads, the dead weight of the tower, as well as the weight of the equipment. When calculating the effect of wind, the pulsation component is taken into account. The surrogate optimization method is used to solve the nonlinear optimization problem. In the initial approximation, the mass of the tower was 2 tons. As a result of optimization, the mass was reduced by more than 2 times.

Keywords: lattice towers, finite element method, surrogate optimization, resonant vortex excitation

The purpose of the full-scale investigations under the conditions of a pipe electric-welding production in operation was to obtain the necessary amount of actual data characterizing the features of the formation of aerosol emissions, their localization and treatment. During the investigation, the three main groups of factors were considered: the technological factors specifying the features of the technological process of pipe production, the technological conditions factors reflecting the power, frequency and composition of aerosol emissions, the operational aerodynamics of the ventilation systems for localization, removal and treatment of emissions.

Keywords: installations for plasma arc cutting and welding of pipes, gas-air mixture, dust particles size distribution, measuring section, dust density, concentrations of gaseous impurities

A step-by-step finite element method calculation algorithm of concrete filled steel tubes is provided with an example. A comparison of the finite element calculation results with experimental data, calculations according to Russian (SP266.13 25800.2016) and European standards (Eurocode 4) and the “inverse” numerical-analytical method, which takes into account the actual rigidity of sections, is given as well. The study shows an accuracy of the proposed finite element model using Drucker-Prager model for concrete and the “inverse” numerical-analytical method in comparison with standard calculation methods.

Keywords: finite element method, concrete filled steel tubes, Drucker-Prager model, “inverse” numerical-analytical method, eccentric load

The algorithm of the project development for the preservation of the cultural heritage object is considered. Recommendations are given for carrying out work on the preservation of the ruined temple for the possibility of its further restoration. A real example of a survey of an object of regional significance "Church of Archangel Michael" (Belgorod region, Valuysky district, village of Podgornoye) is given.

Keywords: conservation, object of cultural significance, survey, building structures, ruined temple

Energy saving and energy efficiency is one of the priorities of the state policy of the Russian Federation and, in particular, the Stavropol Territory. This article analyzes the current state of energy efficiency of construction facilities in the Stavropol Territory. There is a discrepancy between the technical condition and functional and consumer qualities of industrial and civil buildings to the current thermal engineering standards. From this point of view, the chosen research topic may be very timely and relevant. The problem of increasing energy efficiency depends on solving the issue of energy saving in the design, construction and operation of buildings. Saving energy consumption is one of the most important tasks in the construction, reconstruction and operation of buildings and structures of the Stavropol Territory. The article presents regulatory sources used for analysis and recommendations on energy efficiency of buildings. The conditions for carrying out measures to improve energy efficiency in the cities of the Stavropol Territory are analyzed, cities that have received significant savings due to the introduction of energy-efficient measures are highlighted.

Keywords: construction, construction technologies, industrial and civil buildings, energy saving, thermal protection of buildings, energy efficient technologies, construction industry, Stavropol Territory

The procedure for performing pre-design work on cultural heritage objects of regional heritage is given (for example, the object "Former real school" in the city of Serdobsk, Penza region). An example of a survey of building structures, the compilation of a historical reference on the object, the collection of initial permits is given. The article is written on the basis of the completed research contract 22-146.

Keywords: the object of cultural heritage, pre-design work, technical expertise, building structures, historical information

The article discusses the development of tourism in the Syrian seaside region, which includes many natural, historical and cultural monuments and traditions. Therefore, based on the methods of field analysis, mapping and studying the development plans of the Ministry of Tourism of the Syrian Arab Republic, in this article we will identify the problems of land use, planning, management and investment in tourism. Based on the results of the consideration of the problems, the article presents an assessment of the state of the tourist infrastructure, conclusions are drawn about the need for new approaches to its spatial organization, purposeful planning and management of tourist activities within the boundaries of the entire territory. Therefore, in order to create an attractive, stable and safe tourist and recreational environment, it is necessary to plan a sustainable and well-managed development of coastal tourism, so that all these elements become beneficiaries, not victims of tourism development, allowing countries, especially developing countries, to resist competition in the international market.

Keywords: tourism, planning, sustainable development, cluster approach, tourism cluster

The increasing problem of the formation of ash dumps in the Rostov region dictates the need to search for environmentally friendly methods of waste disposal in the heat and power sector. In this article, the ash and slag waste of the Novocherkassk GRES is considered. We analyzed the chemical and fractional compositions of the ash-slag mixture formed at a coal-fired thermal power plant and proposed the use of ash waste with a size of 10-100 microns in road construction as a micro-filler. To study the strength of the road surface using ash microparticles, we manufactured and tested cubes of modified concrete mixture for compression using a press machine. The obtained result showed that the use of ash as a micro-filler in concrete does not affect its strength in any way. The tests of control samples with the use of ash wastes showed an improvement in the water resistance and frost resistance of concrete while maintaining its strength.

Keywords: ash and slag waste, micro-filler, concrete mix, road construction

The article presents the results of experimental studies of the operation of mobile wood and metal-wood road pavement and work sites. The results allow to predict with sufficient confidence the stress-strain state of mobile road pavements in real conditions of operation ground as temporary roads, helicopter pads and drilling rig sites.

Keywords: mobile road pavement, demountable plate, temporary roads, static load testing

The process of optimizing the applied sections in steel frames with elements of variable stiffness, formed from rolled I-beams by their diagonal dissolution and subsequent welding, is considered. A table with groups of I-beams according to GOST R 57837-2017 is proposed, which are advisable to be used together to form a monosymmetrical I-beam of variable height. An algorithm for finding the optimal section is proposed, taking into account the discreteness of the assortment. The calculation of a typical building structure code 828KM according to the proposed algorithm is carried out and a comparative analysis of the applied sections with the found optimized sections is presented. The possibility of obtaining a more economical supporting structure, both in terms of metal consumption and in terms of the cost of rolled products, is noted.

Keywords: variable section, variable stiffness, diagonal opening, I-beam, steel frame

The article considers the possibility of increasing the resistance in sulfate environments of concrete composites based on cement raw mixtures modified with a slag mineral component and a complex superplasticizer. The method of research and modeling of the nature of the impact of an aggressive environment on composites proves the prospects of the technology of chemicalization of cement concretes for the manufacture of durable building structures based on them.

Keywords: sulfate environment, cement concrete, corrosion resistance, chemicalization, composite, environmental impact modeling

Studies have been carried out to determine the microhardness of the base metal, the microhardness at the fusion boundary and the deposited coating. The influencing factors of the value of the height of the protective coating of the sample on the value of microhardness are considered. Graphs of the distribution of microhardness in the base metal and the protective coating of samples by gas-powder surfacing are presented.

Keywords: microhardness, protective coatings, gas-powder surfacing, fusion boundaries

This article describes the principle of operation of an unmanned vehicle. The cargo "car of the future", which will guarantee the safety, timeliness of the workflow, be based on automatic control without the participation of the "human factor" and optimize labor resources. The manufacturers' market is making every technical and financial effort to implement this type of car, most companies have already launched test versions of equipment in order to "keep up with the times". In order to have a complete picture of the available capacities and assess the development in this segment of technological progress, an analysis of unmanned trucks of the foreign market is presented. But taking into account the difference in the scale of the territory, terrain and weather conditions makes it clear that Russian production should take as a basis other distinctive features when developing this type of transport. The Russian experience of the introduction of an unmanned truck in harsh climatic conditions in the fields is also studied and the further path of drones on Russian roads is considered.

Keywords: transport, unmanned vehicle, drone, unmanned trucks, the future

Pipe fittings, which are one of the main elements of any type of pipeline networks, can be used for various purposes: shut-off, reverse, safety, control, separating, shutting off, etc. In order to control the performance of this element, it is necessary to carry out various tests in the prescribed manner, the main ones being pneumatic. This study is devoted to the development of equipment for in-plant pneumatic testing of rotary check valves for pipeline systems of hazardous production facilities with ultra-high parameters of the working environment. For this design of the installation, the simulation of the stress-strain state of the elements of the installation was carried out, as well as the gas-dynamic calculation of the test circuit of the installation.

Keywords: rotary check valve, pipeline fittings, pipeline system, mathematical modeling, finite element method, strength analysis, stress-strain state, computational fluid dynamics, pneumatic testing, technological pneumatic installation