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Study of the properties of concrete with reinforcement, intended for the production of concrete egg-shaped tubes
Šťastný, Antonín ; Hela,, Vlastimil (referee) ; Hubáček, Adam (advisor)
This diploma thesis examines the properties of concrete with reinforcement, designed for the production of a concrete egg-shaped tubes . The stress is put on using various types of fiber reinforcements. Theoretical part is divided into 4 subsections. The topic of the first subsection is a concrete in general. Second subsection deals with various technology of production of concrete pipes. The third subsection is focused on description and summary of basic properties of concrete and reinforced concrete tubes. The last subsection deals with standardized procedures for testing concrete. Experimental part of this thesis is divided into two subsection. First subsection deals with design of a reference sample. Six different samples of a concrete were designed and their rheological properties were tested. Second subsection deals with the additi-on of various types of fiber reinforcement to the reference sample. Eight different admixtures of a concrete were added to the reference sample. Properties of these admixtures were tested in fresh and hardened state.
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Derrick crane
Kuhejda, Lubomír ; Šťastný, Antonín (referee) ; Pokorný, Přemysl (advisor)
This bachelor’s thesis is aimed on construction design of derrick crane for capacity of 1 000 kg, lining length of 4 000 mm and lift height of 4 800 mm. The purpose is to make design of main carrier and function elements including selection of suitable hoist by given requirements. Strength calculation of selected parts was made according to current applicable standards ČSN 27 0103. In the annex of this thesis are also assembly and manufacturing drawings.
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Derrick crane
Kobzík, Martin ; Šťastný, Antonín (referee) ; Malášek, Jiří (advisor)
This bachelor thesis involves the analysis of construction of derrick crane and his design according to set parameters. The thesis contains strength calculations and proposals for major structural elements and important parts of the crane. It also contains a selection of suitable hoists and drawings in the form of a crane assembly and detailed drawing of arm.
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Vertical bucket conveyor
Holcner, Petr ; Šťastný, Antonín (referee) ; Jonák, Martin (advisor)
This thesis describes design of vertical bucket conveyor (elevator) for vertical transport of grain. The global design elevator is based on functional and capacitance calculation with links to the surrounding area and buildings. Detail of work is focused in design of placement power in elevator head with development of the other designed parts. It is means total placement of drive, the drive shaft and the cylinder in elevator head and method of emptying bucket.
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Travelling Crab
Šíbl, Michal ; Šťastný, Antonín (referee) ; Malášek, Jiří (advisor)
This thesis deals with proposal hoisting device of travelling crab with lifting capacity of 70 000 kg. The main objective is design of bearing elements of cable system – steel rope, pulleys and cable drum. The integral part of the thesis constitutes strength calculation of sheave block and design propulsion of hoisting device - motor, gearbox and brake. Drawing documentation shows sheave block, including piece list and drawings pulley, crossbeam, nut of crane hook and journal of pulleys.
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Travelling and lifting mechanism
Husák, Adam ; Šťastný, Antonín (referee) ; Malášek, Jiří (advisor)
This bachelor´s thesis is aimed on traveling and lifting device designed for transportation of BELL helicopters between tarmac and hangar. The first part is devoted to review and evaluation general producers of similar devices. Furthermore there are analysis of possible mechanisms and subsequent choice of appropriate solution. The second part deals with design solution and calculations. Includes drawing of designed device. This device is defined by load capacity up to 2000 kg and stroke 80 mm.
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Fatigue analysis and life of steel structures
Dostál, Petr ; Šťastný, Antonín (referee) ; Kubín, Martin (advisor)
The thesis is focused on solutions fatigue´s analysis and consequently on persistence steel structures of engineering and building aspects. The theoretical part describes the influence of cyclic fatigue in steel structures, describe the basic characteristics of fatigue and its application, a description of the fatigue life curves and their subsequent mathematical approximation of both engineering and the building terms. The study also includes the calculation of fatigue real parts (structure) in mechanical engineering, depending on the operating conditions of the structure. The work is further prediction of the life of steel structures using damage accumulation hypothesis according to the nominal stress. The practical part composes an example of life calculation of drawbar tractor-trailer bogie suspension of engineering and building terms. An example serves as an algorithm solving the life prediction of engineering and building terms, and reveals the possibility of solving the life of engineering structures in terms of building. The comparison of both approaches is done in conclusion.
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The influence of the preparation and editing of test specimens for testing the durability of concrete and concrete products
Šťastný, Antonín ; Brožovský, Jiří (referee) ; Hubáček, Adam (advisor)
This bachelor’s thesis examines the influence of the preparation and editing of test specimens for testing the durability of concrete and concrete products. In particular it monitors the effect of surface treatment and storage of test samples on durability of concrete. The theoretical part describes the mechanism of damage to the samples exposed to salt scaling. It further describes the test methods, which identifies and describes the durability of concrete and concrete products according to the test standards in force in the Czech Republic. Three types of concerete was proposed and mixed in the experimental part of this work. They were using the same raw materials and were differed in degree of aeration. Samples were made from each types of concrete. Thay had different surface treatment, various degrese of saturation before the salt scaling test and the samples were compared with each other.
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