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Stone surface topography of Prague historic monuments over the centuries
Kovářová, K. ; Cihla, Michal ; Malát, R. ; Semerád, M. ; Tryml, M.
Stonemasons tool traces on stone surface are undoubtably a significant part of monument historic value. As any other profession, stonemasons craft develops over time and has its own specifics in every period. Each work has its own unique pattern and bears traces of individual stonemason workshops, tradition, etc. The study of building stone cutting is based on evolving methods of mechanoscopy and analytical traceology. Stone traceology deals with traces in material and the subsequent reconstruction of tools and the processes of stoneworking. The interpretation of data in terms of determining the actual trace is called a mechanoscopy. When studying a stone surface, the latest 3D modelling technology is used with subsequent analyses by means of Global Mapper software. The use of these methods enables reconstruction of the craftsman’s tools. The presented article is an extract of a study that systematically maps the stone cutting work in the territory of Prague from the oldest buildings to the present day. For example, stonework in 9th century Prague was gradually evolving from simple stone block modelling to sophisticated cutting of blocks in the 12th century. This information can be very useful in the process of monument care.
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Non-invasive material and traceological research of the stone head from Celtic settlement Závist near Prague
Cihla, M. ; Trefný, M. ; Drda, Petr ; Hradil, David ; Hradilová, J.
The sandstone head sculpture from the hillfort of Závist in the southern periphery of Prague has been subjected to a non-invasive survey by mechanoscopic and analytical approaches. A 3D model of a sculpture has been created using laser scanning and photogrammetry. A reconstruction of stonemason's working tools was derived from longitudinal and transversal sections of the traces on the head's surface. Further screening of the surface by handheld X-ray fluorescence identified increased contents of lead and tin suggesting a former intentional coloring of the sculpture's surface. Traces of gold could indicate that the surface was gilded. It was confirmed that the sculpture was originally not a part of a human figure, but was intended to represent only a self-standing head. The way of making as well as the nature of the original surface treatment has excluded the possibility that the stone head from Závist was a modern replica.
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Repair of the parapet walk with battlements made from sandstone ashlar masonry with the regard to its visual authenticity and historic values – implemented sample procedure
Bláha, Jiří ; Kovářová, K. ; Buzek, Jaroslav ; Panáček, M. ; Cihla, M. ; Rafl, T. ; Hejný, L. ; Rybařík, V. ; Chamra, S. ; Schröfel, J.
The multidisciplinary criteria for selecting, preparation and processing of a replacement stone for ashlar masonry were implemented in restoration and conservation of the Castle of Kost battlements – one of the most authentically survived medieval fortification monuments in the Czech Republic. Detailed description of undertaken surveys, preparation and interventions carried out within the repair process.
Fulltext: content.csg -  PDF
Plný tet: 0453124_2016_Blaha_et_al_Setrna_obnova_stredovekeho_hradebniho_zdiva_z_opracovanych_piskovcovych_kvadru_PP_NAKI20-OPK - PDF
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Criteria for selecting, preparation and processing of a replacement stone for ashlar masonry restoration – sedimentary rocks
Bláha, Jiří ; Kovářová, K. ; Buzek, Jaroslav ; Panáček, M. ; Cihla, M. ; Rafl, T. ; Hejný, L. ; Rybařík, V. ; Chamra, S. ; Schröfel, J.
Geologists, structural engineers, construction historians, conservationists and restorers formulated their views on the relevant intensity of interventions, the replacement stone quality and also the parameters of processing by craftsmen. Methodical guidelines define the necessary level of adequate historical, technological and structural surveys and, subsequently, propose an optimal procedure for laboratory tests and for the following repair processes of a particular structure.
Fulltext: content.csg - PDF
Plný tet: 0453121_2016_Blaha_et_al_Kriteria_pro_vyber_pripravu_a_opracovani_nahradniho_kamene_urceneho_pro_opravy_kvadroveho_zdiva_CM_NAKI20-OKZ - PDF
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Kritéria pro výběr, přípravu a opracování náhradního kamene určeného pro opravy kvádrového zdiva - sedimentární horniny
Bláha, Jiří ; Buzek, Jaroslav ; Cihla, Michal ; Hejný, Lukáš ; Chamra, Svatoslav ; Kovářová, Kateřina ; Panáček, Michal ; Rafl, Tomáš ; Rybařík, Václav ; Schröfel, Jan
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