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Many bridges in Slovakia are reaching their designed life span these days. Due to frequent errors during the construction of those bridges as well as bad maintenance, steel-concrete bridges are now in a critical state and urgent repairs of those structures are needed. In this article progressive methods of retrofitting existing concrete bridges are shown. In the presented method, the original pillars and original bridge deck will remain in their place, and on the existing deck new composite, steel-concrete bridge deck with encased steel members of progressive shape will be created. This method brings significant cost reduction for such retrofitting and enables the application of increased loads on the bridge.

When designing the foundations of any building structure, it is important to know not only the load of the structure, but also the deformation characteristics of the subsoil. Their underestimation leads to incorrect design of the foundations or even to failures, the reparation of which requires considerable financial costs. The real values of the deformation soil properties gained from the geotechnical investigation often do not match the tabulated values used in the design. In this contribution, actual and tabular values of selected soil properties in the bedrock in the locality of Kosicka kotlina are compared. Simple buildings designed according to the 1st geotechnical category are in the described location predominantly based on Neogene clay of intermediate plasticity class F6 and less on clays class F8. These are soils sensitive to changes in their natural moisture – they swell when exposed to water, thus become unstable. It is therefore important to use the most accurate values in the calculation of the foundations. The analysis of 130 measured values confirmed that 52% of the all measured values are outside the indicative table data. The use of inaccurate input values can bring a risk and threat to safety, reliability and proper use of any construction. It is therefore necessary to carry out the appropriate geotechnical investigation of soils for all types of buildings.

The paper deals with the assessment of slope stability on the road II/595 near the village Zlatno before and after the landslide caused by floods in 2010. The calculation of factor of safety was made using GEO 5 software. For proposal comprehensive assessment and possible remedial work is necessary to know the geological conditions and choose the appropriate method for assessing slope stability. The critical factors of safety have been determined by Petterson, Bishop and Sarma Methods. After finding the most unfavorable slip surface a proposal of remediation measures has been made. The paper presents various solutions to ensure slope stability of the road. The most appropriate remedial action is Variant III - reinforced slope due to its greater factor of safety.

Many bridges in Slovakia are reaching their designed life span these days. Due to frequent errors during the construction of those bridges as well as bad maintenance, steel‐concrete bridges are now in a critical state and urgent repairs of those structures are needed. In this article progressive methods of retrofitting existing concrete bridges are shown. In the presented method, the original pillars and original bridge deck will remain in their place, and on the existing deck new composite, steel‐concrete bridge deck with encased steel members of progressive shape will be created. This method brings significant cost reduction for such retrofitting and enables the application of increased loads on the bridge. [ABSTRACT FROM AUTHOR]