Modern diagnostic methods and traditional carpentry techniques used for the renovation of the White Tower belfry in Hradec Kralove

0447262 - ÚTAM 2016 RIV PL eng C - Konferenční příspěvek (zahraniční konf.)
Kloiber, Michal - Bláha, Jiří - Václavík, F. - Růžička, P. - Kunecký, Jiří
Modern diagnostic methods and traditional carpentry techniques used for the renovation of the White Tower belfry in Hradec Kralove.
Structural Health Assessment of Timber Structures. Proceedings of the International conference on Structural health assessment of timber structures, SHATIS'15. Vol. 1. Wrocław: Dolnośląskie Wydawnictwo Edukacyjne, 2015 - (Jasieńko, J.; Nowak, T.), s. 260-271. ISBN 978-83-7125-255-6. ISSN 0860-2395.
[International Conference on Structural Health Assessment of Timber Structures, SHATIS’15. Wrocław (PL), 09.09.2015-11.09.2015]
Grant CEP: GA MK(CZ) DF11P01OVV001; GA MK(CZ) DF12P01OVV004
Klíčová slova: wood carpentry * timber framing * belfry * in-situ testing * compression strength * resistance drilling endoscopy
Kód oboru RIV: AL - Umění, architektura, kulturní dědictví

This paper describes the instrumental methods for evaluating timber quality and conditions, applied in the preparation for the White Tower belfry renovation in Hradec Králové. The belfry holds the third largest bell (8t) in the Czech Republic. Latest diagnostic equipment and methods (grips pushed apart in a borehole, resistance drilling and endoscopy) were used for the evaluation of the current state of the historic structure primarily aimed to determinate the position and dimensions of potential hidden defects (e.g. ends of binders or hidden pins of diagonal struts and posts). The outputs obtained using partially invasive instrumental methods could later be verified during the repairs of the belfry, which took place in 2014. The results of the methods used were found to be sufficiently accurate and appropriate for the diagnostics of potential damage as well as the determination of the mechanical properties of historically valuable timber elements. The repairs themselves used the knowledge and skills of traditional manual carpentry to a maximum possible degree. The project also benefited from the results obtained by diagnostic methods, thanks to which oak wood could be prepared in advanced. Wooden variations of traditional lap joints found their application in the extensions of partially damaged beams. The required quality of the newly used timber was achieved by hewing or manual cutting. The process of manual working was continuously monitored and the results are subjected to discussion in the paper. In order to reduce the costs of manipulation with the constructional elements at the site, a replica of a period winch with a roller was used to lift the material to the third floor of the tower.
Trvalý link: http://hdl.handle.net/11104/0249150