bluuebunny/crossref_metadata_2025 huggingface dataset:
Critical factors affecting schedule performance of transportation infrastructure projects in the Eastern Districts of Ho Chi Minh City, VietNam
Authors: Truong T A , Ta T T
Published: July 2020

The study area is composed of Ho Chi Minh City’s East Urban Area including District 2, 9, and Thu Duc where have been oriented by the City’s Government to become the urban intelligence, a place to create Highly Interactive Innovation Districts with innovation development model applied for all aspects of economic, human living, eco environment, smart infrustucture and networking. Transportation infrastructure is one of the most important factors to contribute to build the future smart city in this area. However, in fact, many projects have been delayed directly affacting the development of this area that can slow down the progress of creating intelligent districts. The aim of this study is to investigate factors that influence the schedule performance of transportation infrastructure projects in the East of Ho Chi Minh City to contribute to the project management works. To achieve the goal, the survey conducted with 10 experts and 185 people working in this type of project implemented during the period from 2011 to 2018, using statistical analysis of responses on the attributes and factor analysis to group into six critical factors. Regresstion analysis was also used to test hypotheses and revealed that three groups of factors including Finance; Site compensation; and project fluctuations are strongly affecting the schedule performance. As a consequence, based on the interviews conducted with experienced practitioners, recommendations to deal with these factors are proposed.
Algorithm for neural network regeneration of labor costs based on the assessment of relevant construction data
Authors: Babakr Hussein Khoshnaw Yousif , Bolotin Sergey , Bagulya Valeriya , Bohan Haitham
Published: July 2020

In the scheduling of construction production, which is an integral function of the organization of construction, the task often arises of choosing adequate labor costs. There is an obvious way to solve this problem - this is the use of previously developed databases. However, its implementation requires the creation of such reference standards by which an adequate choice can be made. On the other hand, creating an entirely new labor base will require even more time and resources. In order to reduce all costs associated with the creation of the database, a neural network algorithm for the regeneration of labor costs is proposed based on the assessment of relevant data, which can be formed on the basis of executive documentation for completed construction projects and for organizations involved in their implementation. As a result, the regenerated norms of labor costs are based on the secondary use of statistics fixing actual labor costs.
Management of construction prices in vietnam under market orientation In the period of international integration
Authors: Doan Duong Hai , Dinh Dang Quang , Do Huu Khoa , Dang Thi Hong Duyen , Nguyen Dinh Hieu
Published: July 2020

Different from countries with long-standing market economies, Vietnam and the Russian Federation are both transitioning from a centrally-planned economy to a market economy, so the determination of the state role in construction price management is particularly important. In Vietnam, the system of construction cost norms, issued by Vietnamese government applied throughout the country, is obsolete and does not keep pace with the development of construction technologies, leaving a huge gap in practice.

In developed countries, the collection and establishment of construction price data are based on detailed unit prices finished construction contracts, official published national statistics, and annual reports from professional associations and businesses.

This paper surveys literature review on the topic of construction price management and analyses, current situation and construction price formation in Vietnam which contributes to innovating the way of forming and managing construction prices in the direction of market and international integration.
Contract Form for Building Information Modelling (BIM) Projects Applied on Construction Industry in Vietnam
Authors: Tuan Hai Dinh , Nam Trung Nguyen , Dieu Huyen Khuat
Published: July 2020

Building Information Modelling (BIM) is a process supported by various tools, technologies and contracts involving the generation and management of digital representations of physical and functional characteristics of places. In general, BIM is researched and applied in many different fields related to construction investment projects. This paper focuses on analyzing the trends of the world in establishing BIM contract terms and assessing the sample of construction contract form in Vietnam piloted BIM. As a result, it proposes next steps for contract terms in projects using BIM in near future in Vietnam.
The blockchain technology in real estate sector: Experience and prospects
Authors: Pankratov Evgeny , Grigoryev Vladimir , Pankratov Oleg
Published: July 2020

Based on the study of existing practice and specific examples of the use of innovative blockchain technology in real estate transactions and its management, the article gives the basic concepts of this technology, analyzes foreign and domestic experience of its application, examines its sphere of use in the real estate market, substantiates main advantages and shortcomings, as well as the process of various mechanisms for financing real estate transactions. It was revealed that when using the blockchain system, all real estate transactions proceed faster, safer and cheaper. Thus, the objectives of the article include studying and summarizing the Russian and foreign practices of using blockchain technology, as well as determining the main ways and options for its further development and improvement, as a highly effective and promising financial and economic mechanism for participants in real estate transactions.
Resource assessment of large-block construction of NPP
Authors: Morozenko Andrey , Shashkov Alexey
Published: July 2020

This article explores the features of the use of prefabricated-cast-in-place structures in the construction of nuclear power plants (NPPs), the organizational and economic feasibility of using prefabricated-cast-in-place structures in the implementation of new projects for the construction of nuclear power plants. Modern technological solutions of prefabricated-cast-in-place structures are presented. The organizational and technological features of the use of large-block construction of nuclear power plants in the implementation of foreign projects are identified. Estimated labor and resource costs for the manufacture of large-block structures for the reactor building of nuclear power plants. The dependence of labor costs for the industrial production of reinforcement blocks is obtained, depending on the share of the use of reinforcement blocks in the construction of the reactor building of nuclear power plants. The basic daily resource costs for the production of reinforcement blocks are analytically calculated.
Information technology application in the construction project life cycle
Authors: Kuzina Olga
Published: July 2020

Development management models of object information base are necessary for definition the volume of resources and construction object cost at each stage of building life cycle taking into account the existing requirements to definition each type of cost at stages from PRE-BIM to RE-BIM. To develop and implement the cost management system of the object in the construction industry, it is necessary not only to determine the main levels and parameters of choice when taking into account decisions from the organizational and technological documentation, but also to build an architecture of application software based on artificial intelligence for the operation of the management system at all subsequent stages of the life cycle of the construction object. It is important to determine the main factors influencing on the process of decision-making, and the parameters of the formation of input and output data for modelling each stage of the life cycle of the object, as well as technical and economic indicators of the information model by stages. The diversity of digital technologies opens new possibilities for every project and the cost model help to connect the processes throughout project lifecycle.
Assessment of the safety of Rogun HPP dam in case of seismic impacts
Authors: Orekhov Viatcheslav , Alekseev German
Published: July 2020

The article considers the problem statement and the results of numerical studies of the formation of the stress-strain state of the rock-earthfill dam of the Rogun HPP under seismic impacts. In this case, the static stress-strain state of the dam is considered as the initial state. The purpose of this work is to assess the seismic stability of an ultra-high dam being built in a mountainous area with high seismicity. To study the stress-strain state of a rock-earthfill dam, we used a method based on the finite element solution of a system of differential equations for the dynamic theory of consolidation of quasi-two-phase ground media. To describe the nonlinear deformability of soil materials composing the body of the dam, we used a mathematical model formed in the framework of the theory of plastic flow with hardening. The calculations were performed in a spatial setting, taking into account the speed of propagation of the impact in the rock base. Packages of 3-component accelerograms synthesized for dam construction conditions were used as seismic effects in the calculations. To assess the safety of the rock-earth dam in case of seismic impacts, a calculation was made for the most dangerous impact when the strength characteristics of the dam body materials were reduced by 1.08. As shown by the results of the calculations in this case, after seismic excitation is not observed the appearance in the body of the dam areas of marginal soil conditions, the value of the total reserve coefficient is greater than the minimum standard value for a special combination of loads and seismic stability of the rock-earthfill dam is provided.
Numerical modeling of the controlled lifting of the structure
Authors: Bestuzheva Alexandra , Chubatov Ivan
Published: July 2020

The numerical simulation of the stress-strain state of the soil mass at the base of the settled foundations of structures with the aim of predicting the possibility of their rise by the method of compensating directed discharge is based on the developed finite element method (FEM) program, verified on a number of test problems. The verification results are compared with the decisions of O. Zenkevich [ p. 3], with analytic solutions of V.G. Rekacha [p. 5] and G. Lame [p. 6]. Comparisons of the results of a numerical solution of the inverse Lame problem are presented. The error in the results of the comparisons does not exceed 0,5 %. In the framework of the linear theory of elasticity, inverse problems have been solved for obtaining displacements on the day surface of the soil at the base of the foundation of the structure with targeted injection of self-expanding mixtures in the thickness of the soil base. The process of targeted injection of self-expanding mixtures using the FEM is modeled by point displacements of the nodes of the computational domain and a change in the boundary conditions. The results obtained on the displacements of the day surface, depending on the local increase in volume in the soil stratum, allow us to judge about the adequate operation of the program and the possibilities of numerical modeling of the processes of work during compensatory injection.
Predicting the reduction of embankment pressure on the surface of the soft ground reinforced by sand drain with random forest regression
Authors: Duc Pham Tiep , Duc Bui Nang , Tien Nguyen Tuan , Chi Phan Hieu
Published: July 2020

The consolidation acceleration of embankment with sand drain has been studied in many researchs and standards. However, the pressure distribution on the surface of soft ground with the appearance of sand drain has not focused. Intuitively, because of the much higher stiffness of sand drain compared to this of soft soil, the stress concentration at the top of sand drain occurred along with the pressure decrease on the surface of soft ground. In this paper, the Finite Element Analysis (FEA) is implemented to obtain a labeled database with inputs are sand drain and soft soil moduluses, diameter of sand drains and distance between them. The predicted variable is the ratio of pressure on the surface of soft ground with and without sand drain (K) obtained based on simulation with Plaxis. Consequently, the developed database used as the input of a machine learning model, the Random Forest Regression (RFR). To the end, observations from FEA reinforced the initial intuition of this phenomenon and a predicting model for K also proposed with Random Forest Regression.
Increasing flow turbidity in pressure systems
Authors: Rakhimov Qudratjon , Allayorov Davronjon , Ibragimova Zaytuna
Published: July 2020

Clearing the water reservoirs from sediments is one of the most pressing problems. There are several ways to deal with this problem, and in most cases, they require enormous amounts of money and energy. Studying the motion of a muddy flow in pressure pipelines is one of the important works for solving this problem. Designed by the Department of Hydraulics and Hydroinformatics (TIIAME), the the inkjet apparatus is considered to be an energy-saving device and uses the potential of the flow itself to remove the muddy sediment from the water structures to the bottom. Typically, the flow carrying capacity depends on several hydraulic flow elements. The article discusses that fuzzy transporting ability depends on relative depth. Relative depth is the ratio of the suction height to the water head in front of the water outlet. The studies were conducted in laboratory conditions. Theoretical work is justified by the law of energy conservation. As a result, a new expression is obtained showing the relationship between the transporting ability of the flow and relative depth.
Calculating the maximum pressure on the diaphragm wall subjected to seismic loading accounting for geotechnical conditions of Vietnam
Authors: Nikiforova Nadezhda , Van-Hoa Nguyen
Published: July 2020

The Russian standards have not provided a method for calculating the pressure on the diaphragm wall under seismic impacts. Vietnamese geotechnical standards use the approach outlined in Eurocode-8. In this study, an empirical and analytical method for determining the maximum pressure on the diaphragm wall for typical types of engineering and geological conditions in Vietnam are proposed based on the pseudo-static method and numerical studies. The results are compared with the values obtained from PLAXIS-2D program, showing a good agreement.
Water jet cutting resistance
Authors: Volgina Ludmila , Sergeev Stanislav
Published: July 2020

The main purpose of the study was establishing the coefficient of hydraulic resistance of two-phase flow using in water jet cutting. In waterjet cutting (JWC) and in abrasive waterjet cutting (AJWC), a two-phase flow consist of water and abrasive solid particles, moves at a high mean velocity (more than 8.0 m/s). Such flows differ from natural and well-studied flows in hydraulic transport. The aim of this work is to investigate experimentally the additional pressure losses during transportation of the abrasive. For the experimental research were used. The supply of fire extinguishing agents is carried out along the sleeve lines, and, as is known, there are pressure losses. In this regard, the problem arises, at what maximum distance from the pumping unit is possible to supply fire extinguishing agents in the form of water and a mixture of water and abrasive particles, and how pressure losses occur in this case, because the flow rates and working pressure of fire extinguishing systems with waterjet cutting are high enough (the working pressure is 30 MPa). The loss of pressure during transportation depends on the flow rate, its viscosity, pipeline characteristics, etc. The results of field studies to determine the basic kinematic characteristics of the two-phase flow are presented. The combination of these parameters is largely characterized by the coefficient of hydraulic friction, which is insufficiently studied for the systems under consideration. As a result of the obtained experimental data, based on the Darcy-Weisbach equation, the coefficient of hydraulic friction was determined, the value of which was 0.019. The coefficient of local resistance was 0.45.
Interaction of a long barrette with three-layer base taking into account elastic and elastic- viscous properties of hereditary creep
Authors: Ter-Martirosyan Zaven , Huu Hung Dam
Published: July 2020

The formulation and solution for the problem of interaction of a single barrette with the surrounding inhomogeneous massif are considered, taking into account the elastic property and elastic-viscous hereditary creep of soils on the basis of mathematical functions and models of the soil environment. In this case, determining the stress-strain state (SSS) of a single barrette with surrounding and underlying soil is complexity. It is shown that when the elastic-viscous hereditary creep of soils is available, there is a redistribution of effort on the barrette between the side surface and the lower end of the barrette in time. Resulting solution can be used to predict the sediment of a single barrette, as well as to determine the limit of the long-term load capacity of a single barrette.
Modification of structural properties of filled soil by the “Geocomposite” method in the base of foundation slab
Authors: Znamensky Vladimir , Morozov Evgeniy , Chunyuk Dmitriy , Vlasov Alexandr
Published: July 2020

The article is devoted to one of the most effective and promising methods for improving the structural properties of soils - the method of “Geocomposite”. The method is based on the compaction and reinforcement of the soil through the injection of mortar under high pressure, as a result of which there is a fundamental change in the soil body and the formation of a rigid structure naturally inscribed in the soil layer. The method is widely used both to improve the mechanical properties of soils for new construction, and for raising and eliminating the tilt of the operated buildings (compensation injection). The article presents brief information about the technology of shoring soil using the “Geocomposite” method and the main differences in the formation of fixed volumes in cohesiveless and cohesive soils.
A resource-efficient development of VELOX-technologies during erection and reconstruction of prefabricated monolithic floor slabs
Authors: Akimov Seyran , Shalenny Vasiliy , Leonenko Kirill , Malahov Vladimir
Published: July 2020

A resource-efficient method of installation of prefabricated monolithic floor slabs by increasing the degree of their construction readiness is proposed in the article. This effect is achieved by the reducing of their own weight and the use of fixed formwork. The reduction in the dead weight of the precast-monolithic floor slab is ensured by the use of light three dimensional lined forms of trapezoidal or rectangular shape, preferably made of expanded polystyrene during the installation of the floor slab. The use of fixed timber formwork will obviate the need for the later implementation of labor-intensive finishing and insulation works. Thus, the installed floor slab will have an increased degree of building readiness immediately after its manufacture, and will also reduce the weight of the structure, which in turn will reduce the material consumption and accordingly the cost of the supporting structures of the building.
Composite Modelling in Port Engineering
Authors: Hadla Ghinwa , Anshakov Alexander , Kantarzhi Izmail
Published: July 2020

An introduction and review of the composite modelling, defined as the combining of physical and numerical models, are presented in this paper. Although the composite modelling is still in its infancy in the hydraulic community, in MSUCE it has been applied in many coastal projects, which will be described in this paper. The strengths and weaknesses of numerical and physical models for each case studies, are described. The optimal methodologies and guidelines on how to decide if the composite modelling is beneficial and how to set up a composite modelling experiment, are given. Finally, it was concluded that despite the challenges and difficulties, there is a growing trend toward applying the composite modelling as an effective tool in the field of coastal engineering.
To the problem of determining the deformation characteristics of jointed rock mass
Authors: Zertsalov Michail , Vlasov Daniil , Minin Kirill
Published: July 2020

Abstracts

The article considers the results of the study of a fragment of rock mass weakened by a system of parallel joints. Using numerical modelling, its deformation characteristics at different ratios of the characteristic size of the fragment to the characteristic size of its structural element (layer) are studying. The conditions for the representativeness of a fragment are discussed. The results of numerical calculations are compared with the results of the previously proposed analytical calculation method and the conditions for their convergence are discussed.
Transient processes and optimization of HPP hydraulic structures
Authors: Berlin V V , Fink A K , Golubev A V , Muraviov O A
Published: July 2020

In the scope of Hoabinh HPP extension an additional powerhouse is being designed on the common reservoir with two units 240 MW each and two pressure tunnels 765-785 m long. Due to unfavorable geological conditions the design organization made the decision to abandon the construction of the compensating reservoirs on the tunnels. To reduce the hydraulic hammer the current speed in tunnels was decreased to 3 m/s which is half as much of the speeds normally accepted in energy conduits. The article presents a set of calculations of transient processes required for feasibility study of decreasing the internal diameter of the head conduit in abandonment of the construction of the compensating reservoir. The calculations were performed using the specialized program of calculations of the transient processes of HPP. There were considered the processes of load rejection, frequency regulation in allocation to the isolated energy district and power regulation at constant frequency in the power grid. There is presented the system of limitations of the parameters of transient processes which permitted to justify the decrease in the internal diameter of the conduit from 11.5 to 10.5 m. It is shown that with decrease of the pressure tunnel diameter there are fulfilled the given guarantees of regulation in pressure and in rotation frequency, the conditions of fluctuation stability in frequency regulation, specific speed of power regulation.
Ejecting ability of circulating flows of liquid and gas
Authors: Orekhov Genrikh
Published: July 2020

The process of aeration of liquid plays an important role in many structures and devices. In water-works and hydropower construction during operation of the spillway systems, aeration allows for hydrodynamic and cavitation effects on the elements of the structures to be monitored. Aeration is also used to saturate water with oxygen depending on the purpose of the chemical or biochemical processes in various industries, for example, in fisheries and hydro ecology. Of all known methods the most widespread is the gas-liquid aeration. It allows not only to generate air bubbles, but also to control technological parameters. Various types of circulating flows of liquid and gas, which are swirling flows in circular cylindrical channels, are widely used in various fields of engineering. One of the effects of such flows is the emergence of recirculation areas with pressure in the near-axial zone of the flow below atmospheric one, which makes it possible to eject air into water masses. This feature allows the use of efficient aeration devices based on circulation flows. The report presents the results of physical studies of a complicated flow formed by interacting, oppositely rotating, coaxially located liquid layers. The description of the experimental stand for model studies of such flows is given. Analytical dependences of pressure distribution and specific energy in circulation flow of the viscous liquid are presented. The results of physical modeling to determine the ejection ability of circulating flows, the experimental dependences of the ejection coefficient for different methods of swirling the flow are presented.
Innovations in construction and the practical potential of wood in student projects
Authors: Dagdanova Ts B , Khadeev M B
Published: July 2020

Annotation. The problems of environmental pollution on the planet, the processing of human waste, makes architects and builders look for a solution to the problems by means of architecture and new technologies in construction. The article deals with the construction of wooden and wood structures in the Western countries, in particular, the construction of high-rise buildings as an alternative to the concrete and metal constructions. Wood as a modern high-tech, reliable and environmentally friendly building material in comparison with other materials shows its advantages in many ways. Article presents separate project proposals within the framework of the International Student Competitions “Timber in the city: Urban Habitats” 2018-2019 and 2015-2016 organized by the Association of University Architectural Schools of the USA - ACSA, as well as examples of unique wooden structures designed by famous architects. The XII International Congress on Wooden Construction in Moscow Recommendations, including ones on education and the need to train relevant specialists in Russia, are examined.
Gas-hydrodynamic characteristics of aerotanks
Authors: Kul’kov V N , Yu Solopanov E
Published: July 2020

The purpose of the research was to determine the hydrodynamic indicators of aerotanks determining the depth and effectiveness of wastewater treatment. The study of technological parameters of the aeration tank was carried out on a physical model representing a transverse vertical section of the aerotank. The hydrodynamic similarity in the model and industrial aerotank determined by the identical values of the Reynolds, Froude, and Euler criteria. The study of similar indicators on an industrial aeration tank is very difficult and costly. The model and experimental setup make it possible to vary in a wide range the intensity of air aeration, the design and location of the aerator, control the speed of hydrodynamic flows and the concentration of freely floating sludge in the facility with aeration. To study the gas-hydrodynamic indicators in the aerotank model, original methods based on the laws of physical chemistry have been developed and used. The contact surface of the phases “liquid - gas” from the intensity of air aeration was determined using a chemical method for aerated biological wastewater treatment facilities. The dependences of the specific contact surface of the phases “liquid - gas”, referred to the unit of the working area of the aerator, on the intensity of aeration and the depth of immersion of the aerator are obtained. The oxidizing ability of a fine bubble aerator was determined for various aeration intensities. The dependences of the oxidizing ability on the contact surface of the phases ‘liquid - gas” in aerotanks were obtained for the first time. It is shown that the oxidation ability of the aerotank is determined by the phase contact surface and, to a large extent, by the hydrodynamic situation in the aerotank, which forms the fields of freely floating activated sludge.
Discrete continuous mathematical models in the dynamics of horizontal vibrations of buildings
Authors: Sobolev V I , Druzhinina T Y
Published: July 2020

In the design practice of design, dynamic models are used, based on the discretization of structures whose inertial parameters are always distributed. The use of discretized models leads to the formation of large-dimensional problems, and the estimation of discretization errors is extremely complicated by the presence of constructive irregularities and heterogeneities of the boundary conditions of the calculated objects. In view of the foregoing, the proposed work is devoted to the formation of mathematical models that allow combining elements with concentrated inertial parameters (discrete elements) with deformable elements whose inertial parameters are distributed (continuous elements). The need for the formation of such models arises, for example, when calculating buildings for horizontal dynamic effects and also when solving the problems of dynamic analysis of building structures with the presence of vibroactive technological equipment.
Heat insulators based on silica clay raw materials
Authors: Storozhenko G I , Kazanceva L K
Published: July 2020

The paper presents the results of laboratory studies and pilot tests of the production of foamed glass based on the silica clay from Shipovo field (Republic of Kazakhstan). It is shown that the granulated foamed glass can be commercially produced from widespread siliceous raw material, using home equipment.
Research of composite binders with nanomodifiers for dry mixes
Authors: Urkhanova L , Lkhasaranov S , Badmaeva E
Published: July 2020

The article discusses the application of various mineral materials for the modification of Portland cement in order to obtain dry mixes. The main component in the composition of dry mixes is Portland cement, affecting its physical, mechanical and technological properties. To modify Portland cement, which is used to obtain dry mixes, various micro- and nano-additives were used: volcanic slag, microsilica, nanosilica. Mechanical parameters of modified Portland cement at various hardening periods are determined. The introduction of micro- and nano-additives positively affects the hydration process of Portland cement, which is confirmed by the study of the microstructure of the modified cement stone using scanning electron microscopy. It has been established that when using various micro- and nano-additives, the amount of low-basic calcium hydrosilicates changes, affecting the increase in the mechanical properties of cement stone. The use of volcanic slag and nanosilica allows to improve the technological and quality indicators of dry mixes. Studies of determining the angle of repose of the composition of composite binders based on Portland cement and volcanic slag, as well as the introduction of nanosilica in Portland cement show a significant change in this indicator indicating an improvement in the flowability of the material.
Assessment of the energy performance of buildings
Authors: Khan V V , Dekanova N P , Khan P V
Published: July 2020

The problems of the heat engineering condition of buildings during operation diagnos are considered. A significant problem is the difficulty of obtaining measurement and other information for complete decision making. As a result of this, it is often necessary to make technical decisions regarding the long-term operation of facilities in conditions of incompleteness and fuzzy information about their functioning and their condition The use the methods of the theory of fuzzy sets. is proposed when making technical decisions to increase the energy efficiency of objects.
Construction of waste incineration thermal power plants for a comprehensive solution to the problems of solid waste disposal in the Irkutsk region
Authors: Kudryashov A N , Samarkina E V , Petrova A N
Published: July 2020

Proposed is a method of processing and recycling solid household wastes (SHW) by combustion in boiler furnaces together with irring - Borodin coal. The technology of preliminary sorting with the list of necessary equipment and works is presented. Thermal calculations of the boiler were performed BBP-420-140-6 on combined combustion of SHW and coal in different ratios. Technological solution is proposed, which allows to dispose of sorted solid household wastes during combustion in furnaces together with coal in different ratios.
Study of changes in emissions into the atmosphere with the reconstruction of heat supply systems
Authors: Lavygina O , Grebneva O
Published: July 2020

In today’s world, environmental issues are becoming increasingly important and relevant. The housing and communal services system is often one of the main sources of anthropogenic impact. So, when receiving thermal energy by burning of organic or mineral fuel, various types of pollutants enter the atmospheric air. In this paper, a comparison of gross emissions into the air during operation of a heat source using fuel oil and wood fuel (pellets) is made. An analysis of the results was carried out. It showed that the most “environmentally friendly” are heat sources, the main equipment of which includes boiler units burning wood fuel (pellets). With the operation of this type of boiler, the level of anthropogenic load in the form of pollutants emissions is significantly reduced, in particular, there is a multiple decrease in emissions of pollutants of hazard class III.
Improving the quality of the air in modern energy-efficient buildings
Authors: Makarov S S , Baimachev E E
Published: July 2020

When operating modern buildings with natural ventilation, it is difficult to maintain the required microclimate balance in the buildings, so mechanical ventilation must be used. This article presents the results of modeling the operation of a supply and exhaust unit with a plate heat exchanger. Based on the analysis, data on energy consumption depending on the method of preheating the supply air are obtained. It is concluded that the least energy-consuming option is to use an air-to-air heat pump.
Device to perform primary damper tank wastewater treatment at sewage pumping stations. Static calculation
Authors: Skibo D V , Kunitsyn A G
Published: July 2020

The design of “Device to perform primary wastewater treatment of suspended solids at sewage pumping stations” utility model is considered to be implemented in existing and newly designed sewage pumping stations, as well as in automated damper tanks. Exemplified by real conditions, static loads on the main structural elements are modeled. The construction arrangement is evaluated in the terms of possibility to be used as a base for the development of the model range. The possibility of developing an industrial design is determined based on the results of analysis of the strength of the units.
Architectural features and problems of preserving the monument of Orthodox construction in Transbaikalia - the Church of the village of Konduy
Authors: Drobotushenko E , Novikov P , Karasev S , Lantsova Y
Published: July 2020

The article is devoted to the construction of one of the little-known monuments of Orthodox Church architecture on the territory of Eastern Transbaikalia-the Church of the Kazan icon of the mother of God and the Holy Martyrs Kirik and Iulita in the village of Konduy in the Borzya district of the Chita region. The features of using building materials and architecture are described. The question of the origin of building materials is analyzed. It is noted that the Church stands out among Orthodox churches by its external decoration. The question is raised about the need to preserve such an unusual monument of Church architecture.
Regeneration of architectural style of the historical environment of the cultural and public downtown
Authors: Hokhrin E V , Smolkov S A
Published: July 2020

Comprehensive consideration of problems of preservation and development of historical appearance of the city and also questions of the solution of problems of formation of the modern urban environment makes a basis of sense and contents of article. The methodology of a research of a phenomenon of architectural style in the context of the historical environment of the center of the Siberian city is formed on the basis of the analysis and criticism of specific forms of activity and functioning of city community, and ways of its organization in the form of various type of public actions, actions, movements and associations. Researches are the cornerstone various forms of ideas of the internal organization and structure of external relations, understanding and designing of mechanisms of development of own types of the activity and Wednesday providing normal development and regeneration of architectural style. The main stages of formation of procedures of creation of urban style which develops in several plans are stated: organizational and activity and subject and thematic that is provided with between structural communications in the course of cooperation with the subject circle, a way of life of people and their culture. The solution of the listed tasks allows to be objecting the choice of options that is especially necessary in a designing process and updates of the urban environment. The methods of regeneration of architectural style of the historical environment of the cultural and public downtown considered by us allow to perform the described operations over various types of basic and operational data, from formation of a range of parameters to their comparative assessment and to receive as a result indicators of compliance of the studied structure of composition to the set standard. Results of a research confirmed the existing theoretical provisions, having shown thereby efficiency of a research.
Modern city: areas of modernization of the urban environment
Authors: Kudryavtseva V A
Published: July 2020

Modern society places new demands on the urban environment. City residents pose new challenges for the urban development which can be solved by implementing information and communication technologies and modifying the urban environment. Most cities are going through this process in an intuitive way. By structuring the transition to the smart city system, one can increase the efficiency of the urban infrastructure, ensure transparency and develop and improve the urban environment by increasing efficiency and reducing costs, contributing to the economic growth and improving living standards due to the involvement of citizens, businesses and governments in solving urban problems. In Russia, attempts are being made to implement a system of intellectual transformation of cities, which can become a developing mechanism that takes into account existing priority industry directions and make citizens believe in the future of their city based on advanced technologies. The innovative infrastructure can solve problems of technological and human capital development.
Stage-by-stage construction approach in developing railway station complexes
Authors: Kulakov A I , Krakovtseva Yu V
Published: July 2020

Developing modern-day railway stations as a rule goes along with their working. While being reconstructed, the arranged activity of railway stations has to be in-process. Railway stations have to function consistently and continue their work when providing services. To realise large-scale concepts, developing and building activities are implemented through a step-by-step approach with each building stage being autonomous. It means that the functioning of the reconstructed object is in-process when the developing works are under way. The process requires that there should be a close-cut separation of the functional zones, as well as there should be a coherent scheme to serve passengers.
State of the problem of numerical modeling of optimal design of load bearing structures of linear pipeline systems
Authors: Kablukov A V , Dmitrieva T L
Published: July 2020

The features of the design and construction of oil and gas facilities are indicated. Metal flyovers were selected from the general list of capital construction projects in the industry for further study. Special requirements of regulatory documents for flyovers are considered. An example of reducing the cost of design and construction by creating unified design solutions is given, the disadvantages of this approach are identified. The problem of optimal design of flyovers as spatial metal structures is indicated. Brief results of monitoring of scientific papers describing modern optimization methods are presented.
Smart technologies as a type of intangible assets of a construction organization and mechanisms for their implementation
Authors: Peshkov A V
Published: July 2020

The company’s assets include intangible assets, a distinctive feature of which is the absence of physical assets. Today, it is becoming more obvious that the so-called tangible assets are not the only factor in ensuring the profitability of the organization, and that there are other types of them that do not have such a classic feature as a material substance, but can play a crucial role in the process of making a profit for the enterprise. The relevance of this topic is obvious, because in modern conditions, the formation of complete information about economic processes is almost impossible without information about intangible assets. Moreover, with the development of innovative technologies, organizations in the construction industry need to step forward and use such type of intangible assets as Smart platforms. This type of intangible assets allows construction companies not only to meet a high innovative level of development, but also provides a reduction in costs and generate more revenue.
Innovative system of organization of capital repairs of common property of apartment buildings: problems and solutions
Authors: Dediukhina E
Published: July 2020

The analysis and evaluation of the effectiveness of the results of the first stage of the regional capital repair program of the Irkutsk region was carried out. The problems of the innovative system of organization of capital repairs of common property in apartment buildings of the Irkutsk region are considered and ways of their solution are proposed.
Improving construction administration technologies in emergency response: targeted focus
Authors: Matveeva M V
Published: July 2020

The housing development strategy of the Russian Federation for the period up to 2025 sets the goal of providing the population with comfortable and affordable housing. In this regard, the construction management system requires changes in accordance with the tasks of the government of the Russian Federation. Implementation of investment and construction projects in housing construction is quite a complex and multifaceted process. Solving the housing problem requires improving the mechanisms of interaction between participants in the implementation of investment and construction projects in housing construction, especially in the event of emergencies, the number of which increases exponentially every year. In this regard, when determining the possible scenarios and relationship of participants of investment and construction activities in liquidation of consequences of emergency situations it is necessary to consolidate and focus the resources of all participants in the Investment and Construction Projects, which will allow not only to concentrate all resources on realization of the investment construction project within the given time but will also ensure the achievement of the maximum effect to the principle of synchronization of economic interests.
A concession agreement as an effective mechanism for the development of innovative activities in the housing and utilities sector
Authors: Nikityuk L G
Published: July 2020

The state of the housing and utilities sector is one of the most significant indicators of the level of development of the national economy. In many countries, the state of the housing and utilities sector does not fully satisfy needs of the population. Under the slow economic development, an innovative development path can ensure high quality and reliability of services provided. The concession mechanism of cooperation between government and businesses should become a key tool which can attract investment in the development of innovative activities in the housing and utilities sector. The author has developed a support scheme for the investment and innovation project implemented in the housing and utilities sector using a concession agreement within the PPP which ensures stability of the industry and improves quality of services provided. The scheme of concession tools can be used to achieve a social and economic effect. The article presents a method for assessing the economic effect of concession agreements used when implementing the investment and innovation projects in the housing and utilities sector taking into account risks. It can balance interests of the government and housing and utilities companies. The concession mechanism will contribute to the development of the most promising areas of the housing and utilities sector.
Cost optimization for overhauling the apartment blocks in Irkutsk, Russia
Authors: Yamshchikova I V , Lisetskij I A
Published: July 2020

This paper analyzes the specifics and major shortcomings of the following documents: the Irkutsk Oblast Act No. 167-OZ of December 27, 2013 On the Arrangement of Common Property Overhauls in Irkutsk Oblast and the pertaining regulations, programs, and Short-Term Plans Under the Irkutsk Oblast Regional Apartment Block Overhaul Program (hereinafter, common property stands for common facilities used by the residents of a single apartment block, e.g. rooftops, utilities, etc.). It further analyzes the financial reports of the Irkutsk Oblast Apartment Block Overhaul Fund. The analysis demonstrates the costs of overhauling the apartment blocks in Irkutsk Oblast with breakdown by sources, the amount and source of funds coming from the region’s municipalities as shown in the general funding structure of the Plan, and the specific jobs arranged under the City of Irkutsk Short-Term Plan Under the Regional Apartment Block Overhaul Program in 2015-2016. To simplify the drafting of overhaul programs, the authors hereof present the estimates of roof overhaul costs per square meter with breakdown by overhaul-related jobs; the estimates assume the use of novel materials: MasterSeal*501 and MasterEmaco*S 48. Such analysis reveals the roof job-specific coefficients (multipliers) one needs to apply to find the actual overhaul costs for Series 135 panel buildings in Irkutsk. The authors propose an scenario-based approach to design when drafting time-adjusted short-term overhaul plans. Time adjustment helps optimize such plans and minimize the change of a building being classified as a dilapidated apartment block.
Impact of escrow accounts on construction rates
Authors: Matveeva M V
Published: July 2020

Equity construction is actively developing in the Russian Federation. At the beginning of the second half of 2018, there were fundamental changes in the Russian real estate market. Federal Act No. 1 of 2018 July 175-ФЗ was adopted, amending the Act of 2004 on the procedure for citizens ‘participation in equity construction. In particular, the system of subsidization of objects under construction has been completely revised - the equity participation was replaced by the mechanism of project financing. Federal Law No. 175-ФЗ changes the legal and regulatory regulation of housing construction, defining project financing as the only source of attraction of funds to equity construction. In this regard, interest in investments in real estate is growing, and there is an increase in interest of private capital in the housing industry. Thus, today the real estate market is changing, construction companies adapt businesses processes to new requirements. In order to assess the impact of escrow accounts on the real estate market, a comprehensive analysis of market development should be carried out and trends in development should be monitored.