The gas supply system of the industrial enterprise OAO Volgogradneftemash was created more than 50 years ago. Gas-using equipment is physically and technologically obsolete. The article proposes measures for the reconstruction of intershop gas pipelines and gas equipment. The substantiation of the choice of a new gas supply scheme for objects using a dead-end scheme and the installation of individual GRPSh for each consumer is given.

Keywords: reconstruction, gas supply system, production workshop,gas reduction point, material characteristics, enterprise, gas distribution network

The importance of ensuring reliable operation of steel vertical tanks is emphasized. Based on the analysis of a number of scientific publications and regulatory documents, the most characteristic defects are presented in tabular form by groups, the combination of which determines the choice of the method of overhaul or reconstruction of tanks. In accordance with the data given in the table, the most common methods of overhaul and reconstruction of steel vertical tanks are considered.It is noted the need to develop organizational and technological solutions based on information technology, using servers for monitoring through the GLONASS / GPS systems, which will allow, within the framework of monitoring, to detect defects and damage to structural elements in a timely manner during the operation stage and ensure their elimination in order to increase the residual life of vertical steel tanks .

Keywords: residual life, causes of defects, welds, cracks, work methods

The article discusses the basic principles for choosing multi-purpose design solutions for construction production during a forensic construction and technical expertise, and also presents an algorithm for solving problems of this type. Based on the interpretation of the results of theoretical work and the analysis of judicial practice, a method was obtained that can be used in the conduct of judicial construction and technical expertise to solve the problems of choosing design solutions and materials.

Keywords: judicial construction and technical expertise; building production; design solutions; construction expert; mathematical modeling

The priority of modern construction is the consolidation of existing urban development, with existing infrastructure, communications, developed transport network, proximity to the historical center of the city, providing the population with comfortable accommodation and amenities. Construction has a number of features associated with the cramped conditions of the construction site, the development of underground space, which requires fundamentally new organizational and technological approaches in construction, justification and development of the most effective and economical methods for the construction of buildings and structures in dense urban development.

Keywords: cramped construction conditions, underground space, resource conservation, energy efficiency of construction facilities, construction production

This article attempts to analyze the current state of energy efficiency of construction projects in the Republic of Tajikistan. Issues related to improving the energy efficiency of newly built facilities are also considered. The problem of increasing energy efficiency depends on the solution of the issue of energy saving in the design, construction and operation of buildings. Saving energy resources in construction is one of the urgent problems in the field of electric power industry. The level of comfort of buildings and their performance depends on the level of their thermal protection. Reducing the consumption of energy resources is one of the most important tasks in the construction, reconstruction and operation of buildings and structures. Based on this, energy saving is one of the priorities of the state policy of the Republic of Tajikistan. From this point of view, the chosen research topic can be very timely and relevant.

Keywords: energy efficiency, thermal protection, normative and technical documents, natural and climatic conditions, energy consumption, energy saving, insulation, economy, construction

The global global trend in the development of modern computer technologies contributes to the introduction of BIM technologies in the design, construction and operation, working with a single model of a building or structure throughout the entire life cycle. The challenges that arise in the design and construction process stimulate the development of digital technologies, and those, in turn, require continuous study and improvement of knowledge in these areas. To maximize the effectiveness of projects and the implementation of architectural thought by means of information technology, new requirements for the work of architects are emerging. In this direction, it is necessary to train architects and designers of a new generation and to retrain long-time practitioners. In this paper, we have considered the advantages and disadvantages of the transition of the full cycle of architectural and construction design in IT modeling. We studied the issue of rapid identification of shortcomings and instability of the design of the projected building due to the integration of programs: ArchiCAD, SAPPHIRE, LIRA-CAD.

Keywords: architectural environment, information technology, integration, BIM, design, IT modeling, construction

In this paper, a model of automation of the quality control system for the organization of construction of particularly dangerous and technically complex facilities in Russia has been developed. The model uses the initial and replenished databases of general and special work logs, as well as the database of certification and authorization documentation and the links established between them. The developed model will optimize the areas for storing documents in administrative and household buildings and will provide simultaneous access to information for all interested persons.

Keywords: quality control, automation of quality control, organization of construction, project documentation, working documentation, hazardous and technically complex objects

The standard frequency spectrum according to regulatory documents is divided into three frequency bands. The third frequency range is currently not well studied and is represented on the standard sound insulation graph by a straight line. When sound is applied to the plate, at a certain frequency, bending waves in the plate are replaced by shear and longitudinal vibrations. Having considered the processes of propagation of shear and longitudinal waves in a soundproof barrier, it is possible to obtain an adequate physical model of wave propagation in the third frequency range, as well as to form an effective method for calculating the sound insulation of air noise. The physical model of sound insulation in the third frequency range is based on the use of objects in wave propagation media with concentrated parameters: coordinates, weight and velocity. The concepts of "concentrated" and "reduced" masses are introduced. Using the law of conservation of the amount of motion and the law of conservation of kinetic energy, formulas are derived for finding sound insulation in the third section of the standard frequency spectrum. The influence of shear waves on the third frequency range of the standard spectrum is considered. Formulas are given for calculating the initial frequency of occurrence of these waves and for finding sound insulation. The regularities of the appearance of the third section of the standard frequency spectrum are determined. The influence of longitudinal waves on the third frequency range is considered. Formulas for finding the limiting frequency, after which longitudinal waves appear in the partition, and formulas for finding sound insulation due to the action of longitudinal waves are obtained. The refinement of the sound insulation formulas using the modulus of elasticity, taking into account the creep of concrete, is shown. A computational experiment is being carried out to calculate sound insulation for building partitions made of heavy concrete of different thicknesses. Examples of graphs for calculating the sound insulation of air noise according to the method under consideration and according to the methodology of regulatory documents are presented.

Keywords: sound insulation of air noise, reduced mass, concentrated mass, method of discrete (concentrated) parameters, longitudinal waves, shear waves

The article presents an overview of the main possibilities of using hydrogen as a prospect for the "fuel of the future". Based on the main approaches to the development of hydrogen energy in foreign countries, the prospects for its application in the Russian Federation are described. An analysis of the accumulated experience of domestic and foreign companies working in the field of hydrogen energy, considering the introduction of mechanisms for the implementation of hydrogen policy, is presented. An assessment of the possibility of the Russian energy industry for the production and implementation of hydrogen, the relevance of the development of their advantages and disadvantages is presented.

Keywords: hydrogen, hydrogen energy, prospects for the use of hydrogen, combined power plant, development prospects, rating, emissions, production technology, low-carbon hydrogen, steam reforming

The paper presents the results of engineering and environmental surveys at the object of accumulated environmental damage - an unauthorized dump on the territory of the Shuvalov industrial zone in the Leninsky district of Nizhny Novgorod. A description of the study of the territorial and natural features of the object is given: landscape, representatives of flora and fauna, as well as data from laboratory studies of soil samples. An analysis of the morphological composition of the waste and data on the volume and mass of the disposed waste are presented. The level of microbiological, parasitological, and chemical contamination of soil samples with heavy metals is assessed. For carrying out reclamation work at the site, the authors of the work propose a composition that includes natural mineral-organic compounds. The results of the laboratory application of natural mineral-organic compounds with the production of soil-recultivator from the screening of landfill masses are presented.

Keywords: industrial and consumer waste, engineering and environmental surveys, unauthorized dumping, soil pollution, heavy metals, technogenic soil reclamation, reclamation soil

The article talks about improving the competencies of professionals in the management of construction projects based on the international standard IPMA ICB4. Project management has become one of the most important management mechanisms in the market economy system today. Getting the effect of the project management process gives the company a lot of benefits; increases the likelihood of achieving the goals; provided optimal use of resources and satisfaction of the needs of stakeholders. To increase the economic efficiency of investment and construction projects, a competence map of the construction project manager (project manager) has been developed. It is necessary to improve the competencies of professionals in the management of construction projects using the experience of international standards.

Keywords: project, project management, project management, certification, competence, investment and construction complex, international standard, IPMA ICB4 standard, competence map, certified professional

The article considers the results of a study aimed at establishing the constants of enzymatic kinetics of biological treatment of domestic wastewater in low-oxygen bioreactors of the circulating type and proposes methods for calculating such structures using the dependences of enzymatic kinetics Michaelis-Menten. The technological mode of operation of the reactor implies a total oxygen regime of not more than 1.1 mg / l at horizontal flow rates of 0.25-0.3 m/s. The efficiency of wastewater treatment is achieved by increasing the mass transfer of oxygen to the sludge mixture and directly into the flocs of activated sludge, as well as due to aerobic granulation by built-in secondary settling tanks.

Keywords: nitrification, denitrification, activated sludge, aeration tank, granular activated sludge, biological treatment, domestic wastewater, low-oxygen treatment method, energy saving, resource saving, ecology

It is not always possible to use anchoring structures for securing vertical walls of excavations. Most often spacer structures made of pipes have to be used. A special distribution belt consisting of I-beams is required to redistribute the spreading forces from struts and the ground. This article presents the results of a study of structural options and the design of a support table for the spacing structures of walls in the ground (vertical walls of excavation sidewalls).

Keywords: Distribution belt, I-beam, support structure, table, excavation, spacer structures, T-bar, wall in the ground

The problem of increasing energy efficiency remains one of the most important for industries and human activity today. The construction industry is one of them.The problem of the construction of energy-efficient multi-storey residential buildings is closely related to the quality of construction control. The article discusses the main stages of the implementation of possible defects in the enclosing structures of a multi-storey residential building. The systematization of defects is given and the causes of their occurrence are presented. Solutions are also proposed to reduce the negative impact of poor-quality construction control of enclosing structures for the purpose of further study.

Keywords: construction control, energy efficiency, enclosing structures, multi-storey buildings

Results: in this article, the authors reviewed the process of workforce planning on the example of 3 General Contracting organizations. Having the technical documentation on the objects of the General contractors under consideration, the authors were able to deduce the number of workers during the construction of buildings. After analyzing the available statistics, we made a number of graphs showing the movement of monolithic teams on the objects. Based on the resulting graphs, the authors determined the average deviation of the actual number of monoliths from the planned one. Conclusions: the authors analyzed the dynamics of the construction of characteristic objects of different General Contracting organizations, indicating the difference in the values of the planned (projected) and actual labor resources at the facilities. Also, in this article the authors consider a number of the most used in the construction industry software systems for automation of labor resource planning processes, made their analysis and comparison of the main features and characteristics.

Keywords: Software systems in planning, current planning, labor resource, systematization of labor resource fluctuations, automation of planning, production program, labor resource planning

A new approach to the optimization of ribbed reinforced concrete slabs of variable height with prestressing reinforcement is proposed. The approach is based on the design situation, due to the requirements of the strength of normal and inclined sections with full compliance with the design and design requirements, taking into account the strength and cost indicators of the materials used. The paper studies the optimization of elements that operate in the range without the need to install the calculated compression reinforcement. The study was carried out on the basis of taking into account the regularities of the resistance of reinforced concrete and the main provisions of the regulatory documents governing design and development activities in the Russian Federation, as well as relevant works of domestic and foreign scientists relevant to research in this area. The research method used is a structural-analytical analysis using the correlation dependences of the studied factors. Analytical dependences and graphic materials are presented that establish the optimal parameters of the element at the minimum cost of materials in order to use them in design practice. Recommendations for design are given, providing a structure of minimal cost and meeting the requirements of strength and durability. The results of the work indicate that measures to reduce the cost of the slab should be aimed primarily at reducing the cost of prestressing reinforcement. The conducted studies provide an opportunity at the design stage to determine the directions for reducing the cost of the product and justify the choice by rationally assigning the height of the slab, as well as the variable use of concrete and reinforcement of various classes.

Keywords: reinforcement, normal section, inclined section, optimization, prestressing, strength, ribbed plate, cost

The paper considers the issues of the development of executive calendar plans formed during the implementation of the construction of objects of integrated development of the territory (CAT). The complex development of the territory involves, in addition to the construction of residential facilities, the construction of transport, communal and social infrastructure facilities. The author propose a methodology for analyzing executive calendar schedules (ECG) based on the experience of implementing CAT projects. ECG analysis is aimed at developing improved schedules that are used in the development of organizational and technological documentation (OTD) for similar complexes. The methodology allows us to take into account the real conditions of construction of facilities and the capabilities of construction and installation organizations, which increases the feasibility of calendar plans as part of the department.

Keywords: executive calendar schedules, complex development of the territory, reasons for downtime, improved schedules, duration of work on objects

The article is devoted to the problems of the use of building waste in the demolition of houses, as well as substandard products at housing enterprises. The issues of concrete scrap processing, methods of its crushing to obtain materials that can be reused to create reinforced concrete products and structures are considered. Concrete scrap has been investigated for compliance with requirements for large aggregate for construction works. Compositions based on conventional coarse aggregate, concrete scrap and conventional fine aggregate have been developed. For the compositions, the technological characteristics of the concrete mixture are determined, as well as the physical and mechanical characteristics of the concrete at 28 days of age. The use of such compositions for the production of reinforced concrete structures is justified.

Keywords: concrete scrap, secondary crushed stone, concrete, characteristics of concrete scrap, recycling, construction waste, large aggregate from concrete scrap, application of concrete scrap

Hardening of concrete in the conditions of a construction site under constantly changing temperature and humidity conditions does not provide the desired performance properties of concrete and reinforced concrete structures. An assessment was made of the influence of the conditions of hardening of concrete samples at a water-cement ratio (W / C) of 0.45 and a hardening of 28 days. The hardening of concrete samples took place under conditions of a normal hardening chamber (air temperature T = 20 ± 50С, humidity W = 90 ± 2%), samples in water when completely immersed in a bath at water temperature T = 20 ± 30С and samples immersed in a plastic bag , hardening in the conditions of the air environment of the laboratory (T=20±50C). The samples gain the greatest strength when hardening completely immersed in water, and the smallest when hardening in an insulating polyethylene sheath.

Keywords: concrete scrap, fractionated crushed stone, water-cement ratio, hardening conditions, clinker hydration, strength development kinetics, moisture migration

The use of composite materials based on epoxy matrix and carbon or glass fibers for strengthening of existing timber structures of buildings is analyzed. Main benefits and limitations of composite materials are discussed. High tensile strength and stiffness, light weight, corrosion and chemical resistance and relative ease of application without changing the static scheme of structures or stopping exploitation makes fiber reinforced polymers (FRP) suitable for strengthening of timber structures, including those in cultural heritage buildings. Application of FRP in the tension zone of elements under bending helps to arrest crack opening caused by defects and to better exploit the plastic compressive behavior of wood. The use of FRP is limited by their cost, low thermal resistance and limited research and normative documents base. Concluded that further study of materials properties, behaviour of strengthened elements under different types of loading, strength and durability of a bonded joint under different temperature and moisture conditions is required.

Keywords: external strengthening, timber structure, wood, composite, lamella, reconstruction, fiberglass, carbon fiber, reinforcement, epoxy resin

The work is devoted to the search for an optimal design solution for columns of a 16-storey monolithic reinforced concrete residential building with a minimum cost of materials. The modern approach to the constructive solution of high-rise buildings assumes multipolarity at the design stage. Meeting modern requirements determined by human needs, durability and functionality of housing and other parameters, the essential importance of economic indicators is also noted. A special approach to the design stage as an attempt to consider in detail the preparatory stage (the choice of the section and class of concrete columns in buildings made of monolithic reinforced concrete) is justified by the relevance of the problem considered in the article.

Keywords: Reinforced concrete columns, frame calculation, Lira-SAPR, concrete class variation, optimal design of reinforced concrete structures, calculation of a 16-storey building

The article presents the result of a genetic analysis of the architectural and planning organization of the central historical part of the Traktorozavodsky district of Volgograd. The stylistic context is revealed and the semiotic units formed in the architectural and urban planning environment during the period of 1920-1942 of the development of the region are determined. The process of formation of the planning frame, the structure and composition of the development was studied, the main elements that are the basis of the semiotic memory of the studied territory of Volgograd were studied.

Keywords: urban planning, historical analysis of territories, reconstruction, semiotics of the city, cultural heritage, residential areas of industrial areas

Construction, as one of the fundamental sectors of the economy, requires a large amount of building materials, products and structures used as components for the construction of buildings and structures. The uneven provision of the territory of the Russian Federation with various minerals used in construction has led to the peculiarities of the localization of enterprises for the production of building materials in different regions. To overcome the effect of spatial remoteness between manufacturers and consumers of construction industry products, logistics directions for their transportation are being formed to provide construction companies with the necessary amount of resources and materials for the uninterrupted implementation of construction, installation and finishing works. In this article, based on the analysis of the transportation of construction goods across the territory of the Russian Federation, the key logistical directions for their implementation are identified and their parameters and features are characterized.

Keywords: construction, logistics, logistics areas, building materials, cargo transportation

Ecology is an acute problem in the modern world. At many enterprises and in many processes, they strive to reduce emissions of waste and natural gases that have a negative impact on the environment. The author of the article suggests using energy-efficient technologies in housing construction, namely, when carrying out major repairs of apartment buildings in the city of Moscow. In this article, the author considers technologies that reduce power consumption, which can also be applied during major repairs. In particular, an important role for reducing emissions of harmful substances into the environment is the reduction of heat consumption in apartment buildings. The result of the introduction of the technologies listed in the article will be an improvement in the standard of living in the old housing stock.

Keywords: capital repairs, city environment, factors, building, energy efficiency, heat loss, apartment building, ecology, emissions, waste

The article examines the analysis of the current state of the social infrastructure of dual-use facilities, including the values of indicators for achieving strategic goals and objectives, and the question is about further development prospects. The analysis is carried out on the example of the dynamics of the number of military consumers.

Keywords: social infrastructure, design object, dual-use objects, dynamics, provision of services, maintenance of the territory, garrison, type