Terezie Vondráčková

A Technique for Seabed Mining

The paper deals with the necessity to look for other potential uses of unconventional sources of raw materials to meet the growing needs of human society. The first part of the paper contains the overview of the materials located in seas and oceans. This part describes the alternatives of mining, the dredging systems for extreme depths and the functional structure of the hoisting mechanism for dredging as well. The second part of the paper describes the future prospects for the extraction of minerals from seas and oceans.

Selection of Excavators for Earth Work on the Basis of their Performance

For the specific construction of the reconstruction of the railway section Ostrov nad Oslavou and Žďar nad Sazavou will be done removed the railway superstructure and the partial adjustment of the substructure including drainage. For the earthwork will be used excavators of the company Komatsu, with the possibility of adjustment of parameters of the working tool – the length of the bracket and the volume of the shovel. The determined value will be purely indicative, as it does not affect how the operator of the excavator handles the discharge of cargo means.

Increase of the Effective Production of Crankshafts for Ship Engines

KLJUČNE RIJEČI koljenasta osovina matematički model geometrijski model ekonomske prednosti Karel Jeřábek Institute of Technology and Business České Budějovice, Czech Republic e-mail: jerabek@mail.vstecb.cz Terezie Vondráčková Institute of Technology and Business České Budějovice, Czech Republic e-mail: 13260@mail.vstecb.cz Věra Voštová Czech Technical University Prague, Czech Republic e-mail: vostover@fd.cvut.cz

Relationship Estimated Bearing Capacity of Fine-grained Soils with Respect to the Classes of Foundation Soils

Its aim is to elucidate the relationship orientation bearing capacity fine-grained soils and classes of the foundation soils. Quantification and understanding of the nature of bearing capacity in fine-grained soils is one of the basic senses of a geotechnical survey. We can know the orientation suitability of the site for the foundation. This is possible based on the knowledge of the approximate bearing capacity of field surveys. We can also assume certain complications due to demanding building foundations. Approximate estimate of the percentage of each type classes of fine-grained soil is another reason to the knowledge an indicative bearing capacity. It interests us because of its suitability or unsuitability of view the most important characteristics of foundations represented by the bearing capacity.

Evaluation of the Parameters Affecting the Cohesion of Fine Grained Soil

Cohesion of the soils is one of the most important parameters which soil is evaluated in terms of its suitability for building foundations. Safety of construction is in fact dependent on the strength of soil, respectively shear strength. Fine-grained soil represents very specific group, in which is distinguished an effective and total cohesion of soils. The water in the soil thus drastically affects its cohesion contrary to gravel and sandy soils. The publication compares the tabular values of the effective and total cohesion and define the influence of water, grain size and consistency of her behaviour.