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Moravske Branice - Oslavany Track Speed Increase
Hrdlička, Šimon ; Křemen, Tomáš (referee) ; Říha, Tomáš (advisor)
The bachelor's thesis deals with the increase of a track speed in the section Moravske Branice – Oslavany. The thesis attempts to obtain a speed increase by modifying the existing geometric parameters of the track in the scope of the regular maintenance, in some cases even more thorough, yet still not that costly. The assessment of geometric parameters of the track is done according to the standard CSN 73 6360-1. It is also assessed whether the individual railway crossings meet the conditions for the track speed increase. Part of the thesis is also the design of speed for vehicles with a permitted cant deficiency of 130 mm.
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Deisgn of Reconstruction of the Rapotice - Náměšť nad Oslavou Railway Track
Zapletal, Tomáš ; Andratschke, Jan (referee) ; Hruzíková, Miroslava (advisor)
The aim of this bachelor thesis was to propose a change of track geometrical parametres lining and levelling and a reconstruction of railway superstructure and substructure in the track section Rapotice – Náměšť nad Oslavou. The track section starts at the 19,2 km point of turnout number 5 to the railway station Rapotice and ends at the 22,2 km mark after crossing a steel bridge with a continuous rail bed over the Chvojnice river. The thesis deals with railway drainage, reconstruction of railway crossings and provides a work technology proposal. Study of speed increasing in the track section was solved in the thesis too.
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Speed Increasing for Track Section Týniště nad Orlicí - Choceň
Hlávka, Miloslav ; Šiške, Vladimír (referee) ; Hruzíková, Miroslava (advisor)
This bachelor´s thesis studies a possibility of line speed increasing in the track Týniště nad Orlicí – Choceň. The proposed rate increase is assessed in four variants. One of them solves a speed increasing without a change of the track geometric parameters. The others include changes of the track geometric parameters. It is also considered a speed limit in areas of railway crossings, rail development and lights position.
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Influence of Explosive Hardening on the Structure and Characteristic of Hadfield Steel in Terms of use in the Railway Transport
Havlíček, Petr ; Podrábský, Tomáš (referee) ; Nesvadba,, Petr (referee) ; Schmidtová,, Eva (referee) ; Stránský, Karel (advisor)
The high alloyed austenitic manganese steel, the Hadfield steel, thanks to its good wear resistance of the work surface and maintaining the high toughness of the internal material in the same time, is successfully applied for casted crossings. The crossings are the most dynamic stressed components in the railway turnouts. Thanks to low surface and sub-surface hardness the occurrence of plastic deformation and the progressive wear of the crossing running surfaces can be found since the initial stages of the crossing operational life. One possibility how to increase the surface and the sub-surface hardness and this way improve the dimensional stability and the crossing lifetime as well is to apply the explosive hardening of the crossing running surfaces. The technology mentioned above means the application of the explosives in the imminent nearness to the running surface of the crossing, when the high pressure wave acting within the extremely short period actuates the plastic deformation of the material structure. The work deals with analysis of influence of explosive hardening on the structure and characteristic of Hadfield steel. The explosive hardened samples have the surface and the sub-surface hardness checked and the microscopic analysis and X – ray diffraction is applied, including the TEM analysis as well carried out by the transmission electronic microscope. The characteristics experimental testing including outcomes from assessment of the contact – fatigue load of the explosive hardened Hadfield steel samples are the part of the work as well. As an experiment final part the outcomes of the long –term validation, the surface hardness and wear of the crossing running surfaces of the explosive hardened crossing already installed into the Czech Republic railway track are introduced as well.
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