This work is devoted to the problem of conducting a construction and technical judicial examination of a rolled roof after repair. The relevance of the use of roll roofing and its defects are considered. An example with a poor-quality roof repair is reviewed. Besides faults of the management of the homeowners' association were noted. These faults led to the emergence of ambiguity during the examination. They do not allow to interpret the situation in favor of the residents of the house fully, despite the obvious violations of the requirements of regulatory documents and the identification of significant defects. Considered a situation in which a dispute about the type of repair and related judical issues arises. Conclusions based on the results of the study were made.

Keywords: construction and technical judicial expertise, roll roofing, flat roof, maintenance, major repairs, defect, breach of joints

This article discusses the algorithms used for the operation of the chatbot. Within the framework of these algorithms, a general approach to the operation of dialog systems is considered. And the algorithm of the dialog system is proposed, based on a general approach, which includes a natural language processing module. The algorithms that will be applied to the chatbot to search for products of interest to the user are also presented. Among the considered algorithms are such as the algorithm of interaction between the user and the chatbot, the processing of user requests and the algorithm of natural language processing. A modified algorithm for natural language processing is also presented, taking into account the necessary requirements.

Keywords: chatbot, natural language processing, user request processing, named entity recognition, dialog manager, dialog system

The aim of the work was to analyze the advantages and disadvantages of a typical 2-room apartment and find the optimal solution for redevelopment. As an example, we selected a typical planning solution from the developer of a two-room apartment in a multi-storey residential building. The article considers a variant of apartment remodeling in order to improve the housing characteristics of the premises. It is concluded that the typical rational solution for reconstruction is the reorganization of auxiliary premises in favor of residential premises, changing their configurations. The logic of applying the principles of free planning is reduced to creating conditions for comfortable spatial interaction of functional zones.

Keywords: Planning solution, apartment, functional areas, ergonomics, remodeling, living area, wet area, interior, visualization, furniture arrangement, redevelopment, area, insolation, installation, dismantling, building codes

The article discusses modern methods of strengthening the bowl of a reinforced concrete pool in the development of project documentation for major repairs or reconstruction of capital construction objects based on the results of the survey and assessment of the technical condition of structures. To implement design solutions for strengthening the pool bowl, other methods can also be used, for example, using modern methods of strengthening using composite materials [9-11]. This will increase the rigidity of each structure and the bowl as a whole. The development and implementation of these design solutions using modern methods will allow you to qualify the design of the pool bowl in a working state and return the ability to perceive all the loads acting on it.

Keywords: reinforcement, major repairs, reconstruction, design solutions, reinforced concrete, composite, strength, load-bearing capacity

The development of the construction industry leads to an increase in small businesses both in construction and in the sale of building materials. Besides, small business fills the market with various goods, solves various social and economic issues such as unemployment, industry monopoly. However, its activity can't exist without sufficient financial support. A two-level mathematical model of interaction between a retail enterprise and a commercial bank as a funding structure is considered. To research the proposed model, the method of simulation modeling based on numerical search was used. A computer program was created to build a Stackelberg equilibrium algorithm with hierarchical control as an impulsion. The algorithm can be used to find the optimal values of the control parameters of an individual entrepreneur and a commercial bank. These values maximize the objective functions and profit of the system participants. The identification of the proposed model was carried out on the basis of data obtained from the Internet. Finally, the results were obtained using numerical examples.A number of conclusions could be made about the functioning of the entire system.

Keywords: hierarchy,two-level system, credit, Stackelberg, small business, bank

The article describes the design solution of a system for dedusting emissions into the atmospheric air using vortex inertial devices with counter-swirling flows (CSF) and a separator-concentrator. An approach to evaluating the efficiency of such a dust collection system is described. Analytical dependencies and a flowchart for calculating the efficiency of the system are presented.

Keywords: vortex inertial dust collector with counter swirled flows (CSF), separator-concentrator, dust collecting system, dust cleaning efficiency

Technologies of carrying out restoration work on the newly identified object of cultural heritage are given. The types and methods of carrying out repair and restoration work in the conditions of urban development are considered. Recommendations for the most efficient use of material resources are given. The algorithm for carrying out repair and restoration work is being analyzed.

Keywords: work technology, repair, restoration work, cultural heritage object, building structures, buildings and structures

The article deals with the case when a concentrated force is applied to the web of a prestressed beam. The preliminary shear stresses do not affect the stress state in the middle of the beam span. However, preliminary normal stresses will act over the entire height of the wall and affect the distribution of the zone of local stresses and the stress state of the web. Determination of stresses in a beam is based on the beam theory of S.P. Timoshenko. The article presents a system of equivalent forces on the edges of the wall and the equation of normal stresses in the cross section of a prestressed beam. Compared to a conventional beam, prestressing reduces normal stresses from concentrated forces.

Keywords: thin-walled structure, steel beam, I-beam cross-section, prestressing, local stresses, local effect, Saint-Venant principle, Timoshenko SP beam theory, Karman's solution, Fourier integral, stress function

The article is devoted to the development of a software product that analyzes the concentration of gases (H2; CO; C2H4; C2H2) measured in transformer oil and set as a function of time. Product development consists of two stages. The first step is the task of classifying transformers. The second stage is predicting reliable operation before a possible failure based on the concentrations of dissolved gases in the transformer oil set as the initial data. During the development of the software product, the frameworks for creating web applications Flask and ReactJS were used, the models were trained on the frameworks H2O.ai, LightGBM, Sklearn.

Keywords: machine learning, regression, power transformers, gas concentration, web-service

As the object of research, the angular joints of glued wooden structures used for the construction of external enclosing structures in low-rise housing construction, made in factory conditions with modern equipment, were selected. As part of the work, the available literature on this topic was analyzed. The analysis of the variability of the use of modern corner joints of external walls for low-rise construction, made of glued beams, in the design and construction, taking into account the development of technical capabilities in modern industries. Describes the old and new device technology, corner joints, indicating the advantages and disadvantages of such compounds, describes the technical characteristics of the used elements. Conclusions are drawn, as well as recommendations for the further use of these materials in design and construction.

Keywords: glued wood, structural features of corner joints, production of wooden structures

The article provides an assessment of the economic efficiency of a prestressed bistal beam, prestressed stretching of web. The comparison is made with a conventional bistal girder without prestressing with the same cross-section. The costs of material, design, production, transportation and installation are considered. It is taken into account that to create pre-stress, more labor costs are always needed, therefore, the manufacture of pre-stressed structures is more expensive than conventional structures. The purpose of prestressing is to reduce the consumption of steel in the fabrication of the structure. The structure of labor costs for the manufacture of structures is given. A comparative analysis of the cost "in business" of a running meter of a beam, prestressed by wall stretching, and a beam without prestressing, depending on the complexity of their manufacture, is carried out.

Keywords: thin-walled structure, bistal girder, I-beam, prestressing, stretching of web, structure weight, overhead costs, labor intensity of manufacture, cost-effectiveness, custom design, value in action

An algorithm for planning work in a group of autonomous mobile robots performing the functions of eliminating the consequences of fires or emergency situations (ES) is proposed. Such a multi-agent robotic system (MRTS) should work effectively without the direct participation of an operator performing the functions of a decision maker (DM). The autonomy of the MRTS is due to the emergency conditions with foci of infection, dangerous for the stay of people. The paper proposes an approach and a corresponding algorithm for constructing a machine-learning model that solves the problem of optimal current planning for emergency response operations for MRTS, where an experienced decision-maker is the teacher.

Keywords: mobile robots, work area, job distribution, limited resources, linear programming problem, optimal planning, constraints

The article reproduces and supplements the experience of modeling and determining the optimal angle of inclination of the lattice with an estimate of the total lengths of the elements, the greatest forces, displacements and natural frequencies for computer models of various configurations. The possibility of using this system in civil construction with the use of volume-block technology of building construction is described. This article will be useful for design engineers involved in the design and calculation of high-rise buildings, bulk-block or modular buildings made of reinforced concrete and metal structures.

Keywords: diagrid, mesh load-bearing structures, reinforced concrete structure, metal structures, stability, computer model, high-rise buildings, bulk-block, prefabricated module

Constant climate changes, the rapid pace of development of the northern and eastern territories of our country, the areas of permafrost spread, put forward a number of relevant theoretical and applied problems for science. Soil degradation in permafrost areas entails the deformation of buildings, the emergency condition of thermal and power plants, the immersion of road sections after 2-3 years of operation in the ground of the base, the failure of the supports of power supply networks, communication lines and water pipes.

Keywords: permafrost, climate change, soil degradation, monitoring of the technical condition of buildings, operation of structures

Based on the Bayes approach, a representative number of experimental measurements was determined when assessing the quality of the environment, in particular, when monitoring the quality of the atmosphere and checking the compliance with the standard for the accumulation of solid municipal waste

Keywords: Bayesian approach, quality control, experimental measurement, a priori data, a posteriori data, distribution density