SUMMARY 4/2002
The "Ivančický viadukt" Railway Bridge
This railway bridge is a steel-rivet construction that served to bridge the Brno-Střelice-Hrušovany nad Jevišovkou-Vienna railway line across the Jihlava river valley. It was designed in 1868 by engineer A. Rogenhofer. Construction of the bridge was completed in 1870 by the French firm CAIL, whose shareholder was A.G. Eiffel. However Eiffel's authorship of the project is not confirmed. The bridge, which is 265m in length, was the longest bridge of its day in the Austro-Hungarian Empire, and it represented a fundamentally progressive change in the construction and design of this type of structure, illustrating the use of steel in such bridges and serving as an important link in the development of nineteenth-century transportation.
Restoring the Original Plaster Facings of Historic Buildings with the Use of Natural Materials
After a flood of methods and products for the restoration of old plaster facings, and after the processing errors that have occurred, crowned by inappropriate surface modifications (surface coatings), in recent years it has become possible to trace an interesting new trend: a return to, albeit surpassed but historically tested practices and methods used by the old masters.
Today the restoration of an historical building is approached with an awareness of how the building's expressions should as far as possible be preserved for the future, and that the period until the next undertaking of building modifications should also be as far in the future as possible. In recent years this view has also led to a focus on the application and development of newly devised plaster-coating systems and surface modifications. At the same time, with the arrival of newly discovered synthetic compounds, which given their newness had not yet been sufficiently subjected to practical testing over time, the historical approach and complex assessment of work of construction on the whole and in a give locality declined. A part of this has also been the underestimation of master craftwork, the exodus of experienced craftsmen, and a lack of interest among young people in craftwork. New technology has not managed to become a substitute for long experience and skilfulness passed down from generation to generation. This has resulted in insensitive messing with structures and their environment.
Restoring Engineering Networks as a Necessary Condition for the Development of PPP
The territory of the Prague Conservation Area, encompassing the historical grouping of originally independent Prague towns - the Old Town, the Lesser Quarter, Hradčany and Prague Castle, the New Town and Vyšehrad - is not only the largest concentration of protected conservation sites and protected territories in the entire country, it also represents the most extensive underground archive of technical progress in equipping the towns with the technical infrastructure of fuel sources.
Rescue Measures in the Locality of Hřensko
The border community of Hřensko in the district of Děčín has long been threatened by the unstable sandstone cliffs that are found overhanging practically every structure built in the community on both sides of the Kamenice river. At the end of January of this year, geologists drew attention to the increased likelihood of collapse of some of them. A state of emergency has been announced in the community, and a portion of its inhabitants has been evacuated out of the threatened area, which has now been officially closed.
Rescue measures in this locality have always been planned according to the specific place and stability of each site; solutions under consideration involve technical measures, the complete removal of the entire unstable cliff, or its partial removal combined with anchorage. For site K74, a system of tiebacks has been proposed along with a support pillar grounded in micro-piles. Sites K13 and K39 were removed with use of blast technology.