The article is devoted to the control system for the process of moving textile material in an apparatus for impregnating fabrics with periodic action. The control is implemented using a programmable logic controller (PLC). We consider a program developed in the Ladder Diagram (LD) programming language that implements motion control taking into account the change in torque.

Keywords: solution, immersion, technological process, algorithm, programming language LD

Location of compensating devices is determined by various factors: configuration of power supply system, enterprise load schedule, type and length of power lines, parameters of capacitor banks, value of supply voltage. We consider the influence of the above factors on the creation of a mathematical model to determine the location of compensating devices, taking into account the minimum economic costs.

Keywords: compensating devices, reactive power compensation, power system, power grids of industrial enterprises, load schedule, mathematical model, reduced costs

Pipeline networks today are the main and one of the safest ways to transport all kinds of media. This engineering system consists of various elements, one of which is pipeline fittings that regulate the parameters of working media and protect pipelines from overpressure. In order to control the operability of pipeline fittings, it must be subjected to comprehensive tests, one of which is a leak test. The presented study describes the developed design of a technological hydraulic installation intended for use as part of process equipment for conducting in-plant testing of pipeline valves. The results of modeling the stress-strain states of the main units, as well as the hydraulic calculation of the test circuit of the installation are presented.

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

The main recommendations for the installation of a gas pollution detector in domestic premises are considered, an experiment is conducted using the Altair 4x gas analyzer, the purpose of which is to determine the concentration of the gas-air mixture at various points of the household relative gas source. The data obtained experimentally is analyzed, which results in a formula that allows you to determine the approximate concentration of the gas-air mixture, I only know the measurement time and height relative to the ceiling to the measurement point. Also, this formula allows us to note that when choosing the installation location of the gas pollution detector, attention should be paid to the distance from the ceiling to the installation point of the device, while the distance from the wall to the installation site of the device plays a less important role when a gas leak is detected by the device.

Keywords: gas pollution detector, gas-air mixture, gas concentration, emergency shutdown, lower concentration limit of flame propagation

The article discusses methods and models for evaluating options for design solutions for the installation of special-purpose structures when solving problems of construction and technical expertise, and also describes a catalog of design solutions for the installation of special structures, including information on cost, resource, time characteristics and possible technological methods, mechanization tools used materials, the need for transport, the necessary quantitative and qualitative composition of brigades and links of workers.

Keywords: construction and technical expertise; design solutions; installation of special facilities; construction expert; multi-criteria assessment; organizational and technological solutions

The study evaluated the effect of the spring position in the panel on the amount of force required for vertical pushing of the columns. The results show that the farther the spring is from the hinge, the less pushing force is required to lift the column. In this method, the column was connected to the panel by hinged hinges at the factory, which allows lifting elements by crane as a single group during the installation of the frame structure on the construction site. In addition, a spring is installed on the panel at a certain distance, helping to push out the column and secure it. In this article, a threaded connection of precast reinforced concrete columns is proposed, which can be used to connect elements of fully assembled buildings and structures. The contact-screw connection of precast reinforced concrete consists of an upper and lower column, both have a cylindrical steel external thread in the end section connected. The strength of the screw column connection is determined by ensuring the transmission of axial loads and torque in the joints, ensuring the destruction caused by cutting and thread confusion that may occur between the connected columns. By means of the necessary calculations for the screw connection of columns made of precast reinforced concrete the corresponding rigidity and strength were confirmed. The new connections will contribute to the development of construction, its energy efficiency and acceleration of the installation process. These are effective approaches to reducing effort, time, and labor and energy costs.

Keywords: prefabricated buildings, passive assembly, column connection, screw connection, energy efficiency of installation, mounting spring, hinge loop

The article discusses the principles of design and arrangement of foundations using soil-lime pads on subsiding soils in special natural and climatic conditions of the Republic of Tajikistan. Recommendations for the design of bases and foundations for civil buildings for the territory of the republic have been studied and proposed.

Keywords: bases, foundation, subsiding soil, buildings, structures, soil-lime pad, foundation pit, seals, strength, density, pressure

The article is devoted to the design and specifics of the operation of an LED variable irradiation installation for growing plants. The peculiarity of the proposed installation is the periodically changing intensity of irradiation, achieved by alternately switching on and off LED radiation sources. This approach allows you to reduce the power of the power source, which leads to a reduction in the cost of the installation design, improve the quality of the products obtained, thanks to uniform irradiation of plants and reduce the energy intensity of the growing process.

Keywords: led installation, irradiation installation, energy saving, variable irradiation, control unit, microcontroller

The article considers the possibility of optimizing the composition of the reinforcement link when installing the reinforcement frame of vertical monolithic structures. Various variants of the composition of the reinforcement link are considered, depending on the options for connecting reinforcement rods in vertical monolithic structures (binding of the reinforcement frame with a knitting hook, with an automated gun and with a coupling connection). The data for the calculation were obtained by the method of timekeeping of the reinforcement works considered in the article. Based on the conducted timekeeping and the construction of a mathematical model, the optimal composition of rebar workers was determined when performing reinforcement work.

Keywords: timing, mathematical model, optimization, connection of reinforcing bars, link composition, reinforcing bars, monolithic structures, dependency graph, labor intensity, minimum numerical composition of the link, qualification composition of the link

The article offers an environmentally friendly method to assemble pipes into section in order to build, to reconstruct or to fully repair pipelines both in urban communities and outside them eliminating load-carrying devices. The technique is realized with a specially designed assembly line (DAL) consisting of similar devices positioned along one line. The proposed assembly line is executed as multi-functional since the complete range of production processes can be performed with it, starting from unloading pipe sections to laying a ready section into a trench or onto an elevated pipe pier. The offered engineering solution can be used in all places. 3-D spatial models are presented in the article for illustrative purposes.

Keywords: environmentally friendly method, assembly works, pipeline, pipeline assembly, lifting equipment, engineering process

The article provides the information about the erection procedure of a 50.3 m span truss of a multifunctional sports complex in Nefteyugansk, Russia. The expediency of the considered large-span structure in finished form was substantiated by authors. The advantages and disadvantages of the options for choosing the erection procedure were analyzed in detail. Both types of finished truss erection were simulated in Autodesk Revit software: erection with one crawler crane and with two truck mobile cranes. The advantages and disadvantages of these two methods were observed. Erection process with two truck mobile cranes Liebherr LTM 1160-3.1 does not require complicated motions on the construction site, however it is imposiible with intalled beams between coloumns. For erection process with one crawler crane Liebherr LTM HS 855 HD temporary roads is not necessary, but this crane needs special transport for delivery on site.

Keywords: large-span structure, truss, erection in finished state, suspended cantilever method, jib crane, mobile crane, crawler crane, lifting equipment

The purpose of the study, which this article is limited to, is to analyze the violations committed during the installation of precast concrete goods of a residential building, the place where errors occurred and their causes, and analyze the consequences of violation of the technology for erecting the supporting frame of a residential large-panel building. To achieve this goal, it is necessary to study and analyze the main technological actions and in the process of operational quality control, to identify the places of occurrence of technology violations.On the example of a large-panel residential building, the problems of the quality of work during the construction of the aboveground part of the building are considered. The drawbacks of the constructive solution of external wall panels and joints between them are revealed. The main mistakes in the production of work are considered, at what point in the production of work they arise, and what they will lead to in the future. An example of operational construction control of the installation of load-bearing structures of a large-panel residential building is given.An analysis of errors in construction and installation works was carried out, conclusions were drawn and proposals were made to improve the quality of work during the construction of a large-panel residential building.

Keywords: panel house building, quality of construction and installation works, PIK, construction of residential buildings, violation of technological processes, production, construction, quality control

This article discusses various options for carrying out construction and installation works during the technical re-equipment of energy-processing equipment in the building of the Main Building of the existing CHPP. The methods of installation of large-sized equipment to the design mark are studied by three different methods with a description of the features of the work and the characteristics that affect the cost of the work. The enlarged schedule of construction and installation works on technical re-equipment of the boiler drum is given.

Keywords: thermal power plant, technical re-equipment, construction and installation works, technological equipment, large-sized equipment

The paper explores the opportunity to use tower cranes with a large boom length for installation of space frames configured as prefabricated units. The opportunity to modify the already existing technology by using new tower cranes with a large boom length allows cutting the cost of construction of industrial buildings with flat structural plates. Cost cuts are realized by reducing the scope of works pertaining to installation and dismantling of crane runway as well as crane relocation toward other spans of the building.

Keywords: space frames, nodal connections, installation, technology, modification, crane

A method for remote determination of the angular velocity of rotation of the blades of a wind generator based on digital processing of the video stream of this wind generator is considered. The main problems that are encountered with this method of measuring angular velocity are analyzed. The considered method for determining the rotation speed of the blades of a wind generator is possible provided that the frame rate is several times greater than the determined rotation frequency. The minimum possible error of this measurement method was found; the real error of measuring the angular velocity was calculated on a specific example.

Keywords: digital processing of the video stream, image stabilization of the wind generator, finding the contours of the rotor blades, estimation of the angular speed of rotation of the rotor