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Time Assessment of Lifting Mechanisms Efficiency in Civil Engineering
Štěrba, Martin ; Sedlák,, Petr (referee) ; Gašparik,, Jozef (referee) ; Motyčka, Vít (advisor)
The dissertation thesis deals with the time assessment of designed lifting mechanisms in monolithic constructions in Civil Engineering. The main reason for choosing this subject matter is a current trend in construction that in terms of administrative and housing construction tends to build monolithic buildings. Lifting mechanisms are crucial in such buildings nowadays. The efficiency of lifting mechanisms is often neglected in the preparatory phase of construction time schedules, which leads to inefficient capacity utilization of the machine. Nevertheless, this is directly related to meeting the agreed deadlines, which in turn leads to complications that often result in a considerable financial loss for the contractor. In order to solve this subject matter it was necessary to perform monitoring on an appropriate sample of constructions. In the case of this work it was a total of six buildings, four of which were further analysed. Furthermore, individual partial construction processes requiring tower crane operation were analysed. A time assessment methodology including a proposal of possible prioritization of selected activities has been developed. Based on the knowledge gained from the monitoring of the buildings as well as from the analysis of individual items, a simulation model was developed. This model mathematically and graphically evaluates the ability of the designed tower crane to serve a given number of partial construction processes within a specified evaluation section in which the smallest evaluated section equals to one work shift. The benefit of this work is to enable efficient deployment of the tower crane in the preparatory phase of construction. Another benefit is also a prompt operative assessment of the load of the tower crane by a works foreman within a given shift. This should lead to a more efficient deployment of tower cranes during construction and as a consequence it should result in keeping the agreed terms. This is closely associated
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Time Assessment of Lifting Mechanisms Efficiency in Civil Engineering
Štěrba, Martin ; Sedlák,, Petr (referee) ; Gašparik,, Jozef (referee) ; Motyčka, Vít (advisor)
The dissertation thesis deals with the time assessment of designed lifting mechanisms in monolithic constructions in Civil Engineering. The main reason for choosing this subject matter is a current trend in construction that in terms of administrative and housing construction tends to build monolithic buildings. Lifting mechanisms are crucial in such buildings nowadays. The efficiency of lifting mechanisms is often neglected in the preparatory phase of construction time schedules, which leads to inefficient capacity utilization of the machine. Nevertheless, this is directly related to meeting the agreed deadlines, which in turn leads to complications that often result in a considerable financial loss for the contractor. In order to solve this subject matter it was necessary to perform monitoring on an appropriate sample of constructions. In the case of this work it was a total of six buildings, four of which were further analysed. Furthermore, individual partial construction processes requiring tower crane operation were analysed. A time assessment methodology including a proposal of possible prioritization of selected activities has been developed. Based on the knowledge gained from the monitoring of the buildings as well as from the analysis of individual items, a simulation model was developed. This model mathematically and graphically evaluates the ability of the designed tower crane to serve a given number of partial construction processes within a specified evaluation section in which the smallest evaluated section equals to one work shift. The benefit of this work is to enable efficient deployment of the tower crane in the preparatory phase of construction. Another benefit is also a prompt operative assessment of the load of the tower crane by a works foreman within a given shift. This should lead to a more efficient deployment of tower cranes during construction and as a consequence it should result in keeping the agreed terms. This is closely associated
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Evaluation of performance of different size excavators
MACH, Milan
The aim of my thesis titled Evaluation of performance of different size excavators was to select five excavators ranked in different weight categories and subsequently to compare their actual performance. I monitored the actual length of one cycle on the basis of which the real performance of each excavator was determined. These results were mutually compared and summarized.
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Determination of the actual output of excavators depending on the performed technology
ŠŤASTNÝ, Vladislav
The objective of this bachelor thesis is to determine the actual output of excavators, depending on the performed technology. For this purpose five excavators of different weights and different operating bucket capacity were selected. Measurements during different work activities led to identify the actual work cycle of excavators and the actual efficiency was subsequently determined by calculating. Analysis of results determined factors which influence the work cycle time to some extent and thus the actual efficiency of the excavator.
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Dependency analysis of efficiency of dozers on technology work and technical parameters.
TROJAN, Aleš
The paper deals with the explanation of technological works of dozers and the division of operational institutions of a dozer. The aim of this work is to propose principles for the calculation of the actual performance of dozers in relation to operations. This work can be a useful document that can be used by construction companies for accurate calculations of dozer efficiency and thereby achieve improvement and optimization in relation to other operations.
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Analysis of working cycles of excavators in accordance with different variants to be done in constructions
KUČERA, Richard
The subject of this bachelor work is an analysis of working cycles of excavators in accordance with different variants to be done in constructions. That mainly describes variours kinds of excavators and their working tools in a accordance with works to be done in constructions. This subjekt further determines collection od data to assess a real time of working cycles. The next point of the bachelor work refers to factors which influence efficiency of excavators. The last part of the work determines principles and proposals for machines to be optimumly un-tilized in constructions.
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