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Analýza množství extraktivních látek a barvy dřeva dubu zimního
Holčák, Martin
This thesis assesses the experimental findings of the total content of extractives and of the shared content of phenolic substances in wood extracts of the Sessile oak (Quercus petraea) from four different locations in the southern region Pfälzer Wald in the Rheinland-Pfalz Federal Republic of Germany. Moreover, the thesis measures the wood colour in CIE Lab besides focusing only on chemical analysis. The theoretical part outlines general facts about the macroscopic and microscopic structure of the wood (Quercus pertaea). Also, it discusses in detail the issue of colour and chemical composition of wood with a focus on accompanying components. The chapter Methodics describes the process of the entire experiment for the possibility of repeatability of the measurement. The results of this work show mean values of the parameters of the colour L* = 66,7; a* = 7,0; b* = 20,8. Dependence on the total content of the extracts in the wood of the Sessile Oak is not statistically evaluated for these values. The total average content of extracts in wood is assessed at 6,7 % and the content of phenolic substances represents 3,4 %. It is detected that the own colour of wood and also the content of extractives may be affected by the location of growth or even by the position itself within the trunk radius.
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Novostavba administrativní budovy v systému dřevostavby
Holčák, Martin
The final thesis deals with the topic of fire safety of buildings in the Czech Republic in the theoretical part, and later in the practical part presents the project of a wooden-structure administrative building placed within a specific plot in the city of Brno. The project documentation used, regarding its content and implementation, accords with the project documentation related to the construction process set out in the decree 499/2006 Sb, as amended. The theoretical part only relates to selected criteria of fire safety of buildings connected to wooden-structure buildings projects in the Czech Republic and points out a potential normative limitation of the construction of these buildings, especially with regard to the criterion of fire protection height. The thesis also outlines the conditions of typically high-rise wooden buildings construction abroad where the storey number limitation differs significantly from the one in the Czech Republic. Methodologically, the thesis focuses on the method of partial calculations leading to the preparation of a fire safety construction plan. The required principles and methods of calculations are usually the subject of the often-referenced norm ČSN 73 0802 PBS – Non-production premises. The result of the thesis is a comprehensive take on the individual project of an administrative building designated to host a design company. The result consists in gradual satisfaction of all legislative and normative requirements related to the designing of this building type. The thesis’ content points out the interconnectedness of the fire safety topic with the design of the construction and inner organisation, and plot-placing of the building.
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