Automobile Roads and Road Construction最新文献

{"title":"DETERMINATION OF TENSIONS OF SUSPENDED ROPES OF THE BRIDGE BY FREQUENCY OF NATURAL OSCILLATIONS","authors":"I. Gameliak, Sergii Kriuchatov, Yevhen Oksen","doi":"10.33744/0365-8171-2022-111-022-030","DOIUrl":"https://doi.org/10.33744/0365-8171-2022-111-022-030","url":null,"abstract":"The article deals with the issues of development and use of equipment for digital measurements of rope tension based on the frequency of free transverse oscillations. accurate measurement of rope tension is of practical importance. The relevance of this task for the national economy of Ukraine lies in the need to develop a simple and reliable method and equipment for quick and convenient measurement by construction engineers and operating engineers of rope tension in the construction industry. The practical significance of the work lies in the need to timely bring the span structure of the Arch Bridge of the Podilsky bridge crossing over the Dnipro River in Kyiv to the design position after the installation of metal structures with the transfer of the weight of the bridge truss to four main supports and 64 suspension cables with full unloading of four mounting supports for further arrangement of the bridge deck and completion of construction works. The object of the research is the process of measuring the tension of suspension ropes from the own weight of the metal part of the bridge during bringing the truss of the Arch Bridge to the design position of the metal structural elements of the bridge. The subject of the study is the determination of the impact of the combined movement of the upper attachment points (threaded cylindrical couplings) of 64 suspended ropes on the redistribution of the frequencies of natural oscillations and tensions in their contours.","PeriodicalId":440945,"journal":{"name":"Automobile Roads and Road Construction","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127401535","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"CONSTRUCTION OF FRICTION FEATURES OF FRICTION MOVEMENTS OF BRAKE MECHANISMS IN THE VIEW OF THIRD-ORDER POLYNOMIAL MODELS","authors":"Volodymyr Demianiuk","doi":"10.33744/0365-8171-2022-111-252-259","DOIUrl":"https://doi.org/10.33744/0365-8171-2022-111-252-259","url":null,"abstract":"The concepts of frictional characteristic of the brake mechanism and frictional characteristic of the friction pair of the brake mechanism, which are necessary for the calculation of the real braking properties of vehicles, are considered. An experimental device has been developed to determine the influence of such destabilizing factors as temperature, sliding speed and contact pressure on the mentioned characteristics. A method for obtaining polynomial models of the third order to determine the effect of temperature, sliding speed and contact pressure on the coefficient of friction in the friction pairs of brake mechanisms is proposed. The technique is suitable for cases when the second-order models inadequately describe the effect of these destabilizing factors on the coefficient of friction in the friction pairs of brake mechanisms.","PeriodicalId":440945,"journal":{"name":"Automobile Roads and Road Construction","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130669263","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"STUDY OF SAMPLES OF PERMANENT POST-TENSION REINFORCED CONCRETE FORMWORK SLABS FOR BRIDGES DECK","authors":"Dmytro Kot","doi":"10.33744/0365-8171-2022-111-174-183","DOIUrl":"https://doi.org/10.33744/0365-8171-2022-111-174-183","url":null,"abstract":"Shortening the terms of objects construction is one of the most important economic tasks in modern conditions. But it is worth considering the fact that fully prefabricated structures have a number of disadvantages that affect the further operation of the transport facility. Among them are problems related to the impossibility of ensuring reliable waterproofing of the prefabricated elements joints and as the result corrosion of concrete and reinforcement. Taking into account the experience of using prefabricated structures, domestic engineers, as well as foreign colleagues, came to the conclusion that monolithic and prefabricated-monolithic structures provide greater durability of the structure in general. That is why the use of prefabricated monolithic span structures in the construction of transport facilities has become widespread. The use of permanent formwork during the installation of a monolithic deck slab is a promising trend in modern bridge construction. This is especially relevant in the construction of overpasses and flyovers in dense urban areas, where the use of inventory scaffolding for slab concreting is impossible or significantly complicates existing traffic. Although permanent formwork has been used for many years, its work as а part of the structure has not been studied much. It is possible to cite many examples of use of permanent formwork both abroad and in domestic practice. Crack resistance is a pressing issue both individually of permanent formwork tiles and of the prefabricated monolithic in general. The article deals with formwork in the form of flat reinforced concrete slabs with pre-tension reinforcement. The production of such plates is quite economical, despite the use of prestressing, especially by the extrusion method, with subsequent cutting into segments of any shape and length. Study of the experience of using permanent formwork in different countries was the first stage of the research. In order to understand the expediency of using permanent formwork slabs, it is proposed to test samples of such slabs to determine their efficiency and suitability for further operation. The tests were carried out on a power bench with two concentrated forces using the \"pure bending\" method. The test results for such plates are also given in the article.","PeriodicalId":440945,"journal":{"name":"Automobile Roads and Road Construction","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134416032","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"АНАЛІЗ ДОСТУПНОСТІ ТА УДОСКОНАЛЕННЯ ВЕБ-ПРОДУКТУ ДЛЯ КОРИСТУВАЧІВ З ОБМЕЖЕНИМИ МОЖЛИВОСТЯМИ НА ПРИКЛАДІ САЙТУ НТУ","authors":"Oleksandr Bezverkhy, V. Donets","doi":"10.33744/0365-8171-2022-111-217-225","DOIUrl":"https://doi.org/10.33744/0365-8171-2022-111-217-225","url":null,"abstract":"The work is devoted to researching the accessibility of the web product http://www.ntu.edu.ua/ for users with disabilities using assistive technologies. An analysis was carried out at all stages of the software development life cycle for accessibility according to the document \"Specification of requirements for software\" and according to WCAG3[1,2,4,6]. An analysis of software accessibility testing was conducted using one of the WAVE[9] automatic accessibility testing tools, along with keyboard and NVDA screen reader testing. The analysis was carried out and recommendations were made to eliminate inconsistencies for the web product http://www.ntu.edu.ua/, in accordance with the requirements of WCAG21[7,8].","PeriodicalId":440945,"journal":{"name":"Automobile Roads and Road Construction","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127172666","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"PRINCIPLES OF STREET AND ROAD SPACE REDISTRIBUTION IN ACCORDANCE WITH MODERN URBAN PLANNING TRENDS","authors":"L. Hasenko, T. Lytvynenko, Mohamed Gamal Mahmoud Mohamed Elgandour","doi":"10.33744/0365-8171-2022-111-045-054","DOIUrl":"https://doi.org/10.33744/0365-8171-2022-111-045-054","url":null,"abstract":". The article analyzes the modern urban trends of street and road space redistribution, which in recent years are reflected in the regulations of Ukraine. The basic options for such redistribution are: narrowing of lanes for private transport (allowed by updated regulations in Ukraine); reducing the number of lanes for private transport (which does not always reduce the roadway capacity). As a result of foreign experience analysis the stages in which redistribution of street and road space can be carried out are revealed: pilot actions (temporary marking, road barriers and change of traffic organization); intermediate steps of reconstruction (application of new markings, installation of stationary and sliding columns, mobile flower beds, containers with young trees or bushes, large natural stones, lanterns, benches, etc.); comprehensive reorganization of streets and spaces (sidewalks widening, curbs moving, bike lanes allocating or separating, installing of elements to slow down traffic, organizational measures to optimize traffic lights, relocation of utilities, drainage and storm sewer systems, etc.). As a result of the analysis of modern tendencies in designing settlements’ streets and roads and world experience of these tendencies realization, the following principles of street and road space redistribution are formulated: the principle of equality in the right of use, based on space availability for people of any social class, age and state of health; the principle of security, which is to give citizens the opportunity to feel protected on the streets of their city; the principle of diversity of activities, which aims to provide all social groups with accessible and diverse types of recreation and leisure in public spaces; the principle of comfortable microclimate, which is to ensure the comfort of residents on the settlements streets, and the principle of aesthetics, ensuring an attractive appearance of urban spaces.","PeriodicalId":440945,"journal":{"name":"Automobile Roads and Road Construction","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114342082","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"COMPARATIVE ASSESSMENT OF OPERATING CONDITIONS OF TUBULAR DROP MANHOLES OF SEWERAGE SYSTEMS","authors":"A. Kravchuk, O. Kravchuk","doi":"10.33744/0365-8171-2022-111-085-091","DOIUrl":"https://doi.org/10.33744/0365-8171-2022-111-085-091","url":null,"abstract":"The evaluation of standard pipes of drop sewerage manholes is carried out on the basis of the literature data analysis. A new design of the drop manhole with height-variable cross-sectional area is proposed on this basis. A series of experimental studies was conducted on a specially mounted setup to study and compare the characteristics and operating conditions of standard structures and structures of the proposed design. The models of drop standpipes were made of plexiglass, which allowed to visualize the structure of fluid flows in both cases. It is established that three modes of motion can take place in drop standpipes, depending on the passed flow rate: pressureless, transitional and pressure. Pressureless mode of motion should be considered as calculated for permanent cross-sectional drop. Much attention has been paid to measuring the magnitude of dynamic loads from the falling flow to the manhole bottom in the research. Non-uniformity coefficient of the dynamic load from the flow stream impact also was determined. It was defined that its value depends on the flow rate passed by the standpipe and can reach values of 3 or more for drops, that are made of a constant cross-sectional standpipe. The non-uniformity coefficient of the dynamic load for such drop should be taken equal to 1.5. The non-uniformity coefficient does not exceed 1.5 for arbitrary flow rates for variable cross-sectional standpipes.","PeriodicalId":440945,"journal":{"name":"Automobile Roads and Road Construction","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126367622","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"WORKING PROCESSES MODELING FOR INNOVATIONAL CONTINUOUSLY OPERATING EARTHMOVING MACHINES","authors":"Danulo Patsora, Maryna Tomashevska","doi":"10.33744/0365-8171-2022-111-269-276","DOIUrl":"https://doi.org/10.33744/0365-8171-2022-111-269-276","url":null,"abstract":"The article considers the question of the performance increase of the innovative constructions of the bucletless rotary implements of the continuously operating earthmoving machines by improving the process of the rotor discharge from the excavated soil. The physical model has been designed and produced for the proposed design of the bucketless implement with the two-stage tray discharge and a possibility to change the design of the discharge assembly in the process of the study. The model testing methodology and experimental equipment used in this study will allow the perform the necessary set of tests to create the regression equations of the studied process and for optimization of the tray discharge assembly design.","PeriodicalId":440945,"journal":{"name":"Automobile Roads and Road Construction","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122696318","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"RESEARCH OF APPROACHES TO ENVIRONMENTAL IMPACT ASSESSMENT DURING THE IMPLEMENTATION OF THE ROAD CAPITAL REPAIR PROJECT","authors":"Andriy Bubela, O. Zagornyak, N. Sokolova","doi":"10.33744/0365-8171-2022-111-013-021","DOIUrl":"https://doi.org/10.33744/0365-8171-2022-111-013-021","url":null,"abstract":"It is known that all production resources are limited and rare. This economic problem is especially acute for such major components of natural resources as land, forest resources, mineral deposits, water resources, wildlife, which people use in the production of various goods and without which economic activity is impossible. The planning, construction and operation of roads should be carried out in accordance with environmental standards, and the standards themselves should minimize the impact of road networks on the environment. The high level of concentration of heavy industry, unreasonable scale of land reclamation, environmental voluntarism in the development and location of productive forces and the financing of environmental measures on a residual basis lead to an ecological crisis. The effects of economic activity have led to the pollution of vital resources and the degradation of the environment. This article identifies the nature and extent of the main types of environmental impacts during the overhaul of the facility and its subsequent operation. Measures to prevent negative impact on the environment, such as: rational use of land and natural resources, protection of atmospheric air. Ways and means of normalization of the state of the environment, the main source of which on the highway are directly vehicles and road vehicles are considered. The amount of harmful emissions and the distance of their spread varies depending on the intensity and composition of traffic, road, natural and climatic conditions. In the process of existing potential types of environmental impacts is the impact on ambient air. On the geological environment, microclimate, aquatic environment, soil, flora and fauna. The impact on the environment of the road section after major repairs is permanent and is not harmful provided they are harmoniously combined with nature.","PeriodicalId":440945,"journal":{"name":"Automobile Roads and Road Construction","volume":"561 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123393773","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"IMPROVEMENT OF GEODESIC METHODS FOR ROUGHNESS ASSESSMENT OF THE BASE AND PAVEMENT STRUCTURE","authors":"Serhii Ihnatov, Nataliia Neizvestna, Dmytro Pavliuk, Borys Sevriuk, Ivan Shuliak","doi":"10.33744/0365-8171-2022-111-115-125","DOIUrl":"https://doi.org/10.33744/0365-8171-2022-111-115-125","url":null,"abstract":"The article is about the results of the research and development work of highways and airfields laboratory of the National Transport University, namely the development of an experimental sample of a microleveler for evaluating the unroughness of the base and road surface on the basis of an already existing device for measuring the rutting (transverse roughness) of the road surface. The general appearance, main technical characteristics and the algorithm for working with the device are given. The performance of the device was tested by conducting control measurements in parallel with a level of a traditional design on the surface of an asphalt concrete pavement under natural conditions. On the territory of the National Transport University, a series of experimental studies was carried out using known measures of length, accepted as reference ones. Further research and implementation of the device described in the article into the practice of the road industry in Ukraine will make it possible to quickly monitor the construction and repair of road surfaces and coatings and to make corrections in technological processes, to purposefully manage quality, to assess the condition of road surfaces and coatings that are in operation, and to identify local sections of roads with unsatisfactory levelness, which in turn will contribute to the reduction of road accidents associated with unsatisfactory road conditions. At the same time, it is expected that the cost of a domestic microleveler for evaluating the unroughness of the base and covering of road clothing may be several dozen times lower, compared to foreign analogues, under the condition of mass production.","PeriodicalId":440945,"journal":{"name":"Automobile Roads and Road Construction","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133198761","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"SPECIFICATION OF LOAD PARAMETERS FROM MODERN VEHICLES ON THE PAVEMENT STRUCTURE","authors":"I. Gameliak, Vitalii Raikovskyi","doi":"10.33744/0365-8171-2022-111-031-044","DOIUrl":"https://doi.org/10.33744/0365-8171-2022-111-031-044","url":null,"abstract":"Modern construction standards require the design and construction of roads for loading, compatible with European standards - 11.5 tons per axle, which corresponds to the actual total weight of the vehicle 34 tons with the maximum number of axles (6 axles). Only 25% of state roads meet these normative loads (according to Ukravtodor on Facebook) [1-6] .There are examples when modern heavy goods vehicles (these are heavy construction dump trucks and so-called lorries) significantly exceed the standard load per axle (11.5 tons per axle). This significantly increases the destructive impact and reduces the standard service life of the road. Road traffic regulations in Ukraine prohibit the movement of vehicles with an actual weight of more than 40 tons on roads of national importance. An exception is made for container trucks - the weight limit is 44 tons. On local roads, built mainly for the loading of 6 tons per axle, the movement of vehicles with axle loading over 7 tons or the actual weight of over 24 tons is prohibited. Unfortunately, however, in Ukraine there is a massive violation of these standards. This problem has become even more acute with the change of logistic chains of transportation as a result of the military aggression of Moscow after February 24, 2022. There is no technology or coating in the world capable of withstanding a constant load of 80-120 tons. Even a slight overload (by 1-2 tons) entails the destruction of the road at times. Maximum loaded vehicle, regardless of the number of axles, has a destructive effect on the pavement more than the normative from 2 to 56 times. The paper considers the brands of specific vehicles, most frequently moving on the roads of Ukraine with the specification of the following parameters of loads from the wheels of modern vehicles, namely, the distance between the axles, tire pressure, area and shape of the wheel imprint, depending on the load of the vehicle with subsequent use of the data to calculate the pavement structures.","PeriodicalId":440945,"journal":{"name":"Automobile Roads and Road Construction","volume":"26 8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132428869","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}