scholarly journals Erection of solid columns of one-storey industrial buildings with bridge cranes made of high-strength sandy concrete and its economic efficiency

2021 ◽  
Vol 274 ◽  
pp. 03028
Author(s):  
Nikolay Palagin ◽  
Georgy Nikitin ◽  
Alexey Trunov

The use of high-strength sandy concrete (HSSC) is an alternative to high-strength crushed stone. Its use is profitable for those regions of Russia in which crushed stone is an imported building material. Thus, crushed stone is supplied to the Republic of Tatarstan (RT) from the Ural, and the local reserves of sand are significant. Authors presented the results of studies to determine the economic efficiency of solid columns’ erection in one-story industrial buildings with bridge cranes according to the 1.424.1-5 series from HSSC of HSSC60 and HSSC80 classes in comparison with heavy concrete of B20...B80 classes. Studies have shown that in relation to Kazan, the use of HSSC of HSSC60 and HSSC80 classes in comparison with heavy concrete of B20...B40 classes, depending on the size of the span, column spacing, floor height and lifting capacity of cranes, can reduce steel consumption by 43.2…71.5 %. At the same time, the total cost of materials (steel and concrete) when using heavy concrete of B20...B40 classes is 1.7 %...38.1 % lower than with HSSC60 and HSSC80. This is due to the sharp rise in the cost of concrete in the Russian market in the third quarter of 2002 and continuing to the present (second quarter of 2021). When recalculated before the indicated price increase, the use of HSSC60 and HSSC80 in comparison with heavy concrete of B20…B40 classes gives a decrease in the total cost of materials by 1.9...34.5 %. The results obtained are novel because in the scientific and technical literature there is no information about the design of these columns from the HSSC.

2021 ◽  
Vol 939 (1) ◽  
pp. 012003
Author(s):  
B Rasakhodzhaev ◽  
S Makhmudov ◽  
F Muminov

Abstract This paper presents studies on the choice of a heating system based on calculations of economic efficiency and payback periods for alternative systems, a solar greenhouse with a transformable body. The purpose of the work is to carry out calculations to determine the consumption of fuel resources necessary to ensure the required amount of energy for the heating season: consumption of natural gas, solid fuel (coal) and electricity for heating a greenhouse with a transformable (adjustable) body. Analytical methods were used to determine the cost of materials and the main units of a greenhouse with a transformable (adjustable) body. Depending on the shape of the greenhouse, the total costs, economic efficiency and payback periods are determined. The research work carried out shows that, in terms of the cost of construction and consumption of materials, the developed greenhouse with transformable (adjustable) body are quite acceptable for its successful use among farmers and private households in the Republic of Uzbekistan. Calculation of economic efficiency and payback periods for greenhouses with a transformable housing allows you to choose the most acceptable heating system and technical characteristics of alternative systems acceptable for the climatic conditions of Uzbekistan.


2015 ◽  
Vol 49 (3) ◽  
pp. 488-494 ◽  
Author(s):  
Mariana Fexina Tomé ◽  
Antônio Fernandes Costa Lima

OBJECTIVE Identify the direct cost of reprocessing double and single cotton-woven drapes of the surgical LAP package. METHOD A quantitative, exploratory and descriptive case study, performed at a teaching hospital. The direct cost of reprocessing cotton-woven surgical drapes was calculated by multiplying the time spent by professionals involved in reprocessing the unit with the direct cost of labor, adding to the cost of materials. The Brazilian currency (R$) originally used for the calculations was converted to US currency at the rate of US$0.42/R$. RESULTS The average total cost for surgical LAP package was US$9.72, with the predominance being in the cost of materials (US$8.70 or 89.65%). It is noteworthy that the average total cost of materials was mostly impacted by the cost of the cotton-woven drapes (US$7.99 or 91.90%). CONCLUSION The knowledge gained will subsidize discussions about replacing reusable cotton-woven surgical drapes for disposable ones, favoring arguments regarding the advantages and disadvantages of this possibility considering human resources, materials, as well as structural, environmental and financial resources.


2014 ◽  
Vol 48 (4) ◽  
pp. 699-705 ◽  
Author(s):  
Caroline Rife Nobrega ◽  
Antônio Fernandes Costa Lima

To identify the direct cost of procedures related to an outpatient chemotherapy treatment for women with breast cancer. Method: This is a quantitative research, using the case study methodology, performed in an outpatient chemotherapy of a private hospital. The total cost was calculated by multiplying the time spent by professionals involved in therapeutic procedures, the unit cost of direct labor, adding to the cost of materials, drugs and solutions. For performing the calculations, we used the Brazilian currency (R$). Results: The average total cost per chemotherapy session corresponded to R$ 1,783.01 (100%), being R$ 1,671.66 (93,75%) spent with drugs, R$ 74,98 (4.21%) with materials, R$ 28.49 (1.60%) with labor and R$ 7.88 (0.44%) with solutions. Conclusion: The results may support discussions and decision making for the management of costs related to chemotherapy aimed at reducing expenses and eliminating waste without harm to the care provided. 



2015 ◽  
Vol 825-826 ◽  
pp. 763-770 ◽  
Author(s):  
Stefan Junk ◽  
Rebecca Matt

Today, 3D-printing with polymer plaster composites is a common method in Additive Manufacturing. This technique has proven to be especially suitable for the production of presentation models, due to the low cost of materials and the possibility to produce color-models. But nowadays it requires refinishing through the manual application of a layer of resin. However, the strength of these printed components is very limited, as the applied resin only penetrates a thin edge layer on the surface. This paper develops a new infiltration technique that allows for a significant increase in the strength of the 3D-printed component. For this process, the components are first dehydrated in a controlled two-tier procedure, before they are then penetrated with high-strength resin. The infiltrate used in this process differs significantly from materials traditionally used for infiltration. The result is an almost complete penetration of the components with high-strength infiltrate. As the whole process is computer-integrated, the results are also easier to reproduce, compared to manual infiltration. On the basis of extensive material testing with different testing specimen and testing methods, it can be demonstrated that a significant increase in strength and hardness can be achieved. Finally, this paper also considers the cost and energy consumption of this new infiltration method. As a result of this new technology, the scope of applicability of 3D-printing can be extended to cases that require significantly more strength, like the production of tools for the shaping of metals or used for the molding of plastics. Furthermore, both the process itself and the parameters used are monitored and can be optimized to individual requirements and different fields of application.


2014 ◽  
Vol 1040 ◽  
pp. 176-182 ◽  
Author(s):  
Alexandr Sergeevich Inozemtcev ◽  
Evgeniy Valerjevich Korolev

The development of construction technologies is impossible without the proper estimation of economical efficiency. Some results of technical and economical efficiency of the developed high-strength structural lightweight concretes are presented in the article. Overview concerning world practice of research and application of lightweight concrete composition are made. The main properties and advantages of developed energy efficient high-strength lightweight concretes are described. The method of calculation of economic efficiency of concrete by means of reduction of total construction weight and increasing of floors’ number is proposed. Dependence between efficiency, footprint of building and number of floors is presented. It is shown that economical calculation for developed material which is based only on the cost of the material itself does not allow to obtain adequate data concerning prospect and competitiveness of the material. The authors offer method of calculating the economic efficiency of the developed high-strength lightweight concrete which takes into account the technical properties of the new material. The results of the study showed that the application of high-strength lightweight concrete is more effective than traditional kinds of the concretes.


Author(s):  
С.А. Великонивцева ◽  
А.В. Питухин ◽  
В.Н. Шиловский

При переходе к рыночной экономике и обострении конкуренции требования к уровню надёжности лесозаготовительной техники существенно повышаются. В Республике Карелия преобладает сортиментная технология лесозаготовок, и при этом в основном используются харвестеры и форвардеры производства фирм John Deere, Ponsse, Komatsu. Отраслевые институты, ранее занимавшиеся лесными машинами, практически ликвидированы, и объективные данные по отказам можно оценить только непосредственно на лесозаготовительных предприятиях. Цель исследования – разработка методики оценки наработки на отказ элементов конструкций харвестеров и форвардеров производства компании Komatsu на основе представленной в бухгалтерских ведомостях информации о списании запасных частей при эксплуатации комплексов в условиях Республики Карелия. Стоимость запчастей, их наименование и количество отражаются в том отчетном периоде, в котором осуществлялась их замена. Средняя суммарная стоимость запчастей на один объект за календарный 2015 год по форвардерам составила 2398,46 тыс. р. при средней наработке 2956 мото-ч; по харвестерам средняя суммарная стоимость за тот же период составила 2617,79 тыс. р. при средней наработке 3167 мото-ч. Статистическая обработка данных выполнена по всем машинам для деталей, которые наиболее часто менялись при эксплуатации. Представлены результаты по оценкам наработки на отказ и их дисперсиям для пильной шины харвестера и для фильтра-влагоотделителя форвардера, характеризующихся наименьшей наработкой на отказ. Статистическая информация по отказам машин, собранная на основании ежемесячных ведомостей по учету затрат, является ограниченной (неполной), поскольку недостаточно данных для оценки закона распределения наработки между отказами. При анализе данных с использованием критерия Бартлетта выявлено, что выборки значимо отличаются друг от друга и в связи с этим их нельзя объединять. Следовательно, оценки показателей надёжности, рассчитанные с использованием полученных выборок, различаются значимо. Для полного анализа необходимо вести более длительные наблюдения за техникой в процессе эксплуатации и фиксировать каждый отказ с выявлением причины. In moving to a market economy and increased competition requirements for the level of reliability of logging equipment significantly increased. In the Republic of Karelia there is short log logging technology and harvesters and forwarders of firms John Deere, Ponsse, Komatsu are generally used. Industry institutions previously involved in forest machines have been virtually eliminated and objective data on failures can only be evaluted directly at logging enterprises. Therefore, the objective of this article is to present methods of evaluation accumulation on failure constructions elements of the harvesters and forwarders of the company's production of Komatsu on the basis of information in the accounting statements about the write-off of spare parts in the operation of complexes in the Republic of Karelia. The cost of spare parts, their name and quantity are recorded in the reporting period in which they were replaced. The average total cost of parts for one unit per calendar 2015 on forwarders made 2398,46 thousand RUB over medium engine hours 2956; harvesters the average total cost for the same period amounted to 2617,79 thousand RUB over medium engine hours 3167. Statistical data processing is performed on all machines for parts that are most frequently changed during operation. The article presents the results of the estimated time between failures and their dispersions for the harvester saw tire and for the forwarder dehumidifier filter, characterized by the lowest time between failures. Statistical information on machine failures collected on the basis of monthly cost accounting statements is limited (incomplete) because there is insufficient data to estimate the distribution of time between failures. When analyzing the data using Bartlett's criterion, it was revealed that the samples significantly differ from each other and therefore they can not be combined. Consequently, the reliability estimates calculated using the samples obtained differ significantly. For a complete analysis, it is necessary to conduct longer observations of the equipment during operation and to record each failure with the identification of the cause.


Author(s):  
Natalya Zhezmer

Based on the improved methodology, an economic assessment of the mowing technology for hay harvesting is given. The total cost (44.8–47.5 thousand rubles/ha) for the creation of early and medium-mature long-term herbage with the dominance of rhizomatous grasses paid off in 1.6–1.8 years. In the next 25 years, annual production costs amounted to 20.1–21.6 thousand rubles/ha with the cost of 1 feed unit of 5.1–5.6 rubles and a conditional net income of 15.1–20.1 thousand rubles/ha.


2018 ◽  
Vol 230 ◽  
pp. 03009 ◽  
Author(s):  
Alexander Krot ◽  
Viktoriya Ryazanova ◽  
Azat Gabitov ◽  
Aleksandr Salov ◽  
Lyubov Rolnik

Properties of both organo-mineral superplasticized unmodified and modified concretes are considered, impact of workability of concrete and water-binder ratio on strength properties of concrete are analyzed herein. Gonsistent aggregate grading with minimum void, accordingly with maximum packed density under optimum content of dispersed particles in concrete is to be applied to make mortars and concrete with stable properties and less variations in values. The proposed solution enables to simplify proportioning as different combination of aggregates is not required for each proportion. Comparative analysis of various fillers being by-products and materials for making mortars and asphalt-concrete has been made. The results for reinforced steel consumption reducing together with efficient combination of higher grade concrete were considered at amending the “reinforced-concrete structures” section. Computational algorithms made under economic and mathematical methods to improve construction solutions over the reinforced concrete frame are given. Efficient engineering solutions to use high strength concrete and rebar that were applied in some facilities are proposed.


2020 ◽  
Vol 37 (3) ◽  
pp. 76-82
Author(s):  
L.V. Mazitova ◽  

The article presents the results of studying various measures to promote the natural renewal of lime forests in the Kasmarsky uchastkovoye forestry of the Zianchurinsky forestry. The data on lime forests within the boundaries of the forestry were studied, and the calculation of the economic efficiency of promoting natural regeneration was carried out. The use of evenly-gradual and continuous narrow-cut logging in the conditions of the Zianchurinsky forest area in the Kasmar district forest area will avoid the creation of expensive forest crops. The cost of creating forest crops is 10,719. 4 rubles per 1 ha, and the cost of preserving and caring for the forest during evenly-gradual logging is 4,237. 9 rubles, and solid narrow-cutting-3,469. 33 rubles.


Sign in / Sign up

Export Citation Format

Share Document