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INTRODUCTION TO THE ARCHITECTURAL CONSERVATION PROJECT FOR THE FACADES OF THE ROYAL PALACE OF STOCKHOLM

INTRODUCTION TO THE ARCHITECTURAL CONSERVATION PROJECT FOR THE FACADES OF THE ROYAL PALACE OF STOCKHOLM

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  • 1. INTRODUCTION TO THE ARCHITECTURAL CONSERVATION PROJECT FOR THE FACADES OF THE ROYAL PALACE OF STOCKHOLM Heymowski A.a, Günther L.b, Myrin M.c, Andersson E.a, Hägnefelt U.d, Valanis A.d a HOS Arkitekter AB, (andreas.heymowski, elias.andersson)@hosark.se, Sweden b National Property Board of Sweden c Tyréns AB, Sweden d Norconsult AB, Sweden
  • 2. The Royal Palace of Stockholm Style: Baroque Built: 17th century Architect: Nicodemus Tessin 42,000 m2 total area 1430 rooms (closets, basements etc) 972 windows 28 free standing statues 717 balustrade pieces 28,000 m2 total facade area
  • 3. The facades of the Royal Palace Façade Materials 9500 m2 stone facade Sandstone (Gotland & Roslag)11,000 m2 plaster Plaster 7,500 m2 windows and doors Tin, Copper, Iron28,000 m2 total facade area Wood, Glass
  • 4. Examples of stone decay
  • 5. The project step by step2005 Detachment of a piece of decorative 2010 Project Directive sandstone from the façade formal declaration of commence of action and official terms for the project entitled: Long-term maintenance of facades Software engineering; investigation,2006 Maintenance program guidelines, pre-planning i.e. determination of the actions required for the preservation of the 2011 Pilot Project entire palace investigation of practical aspects2009 Preliminary Study and guidelines and specifications investigation into the condition of for the implementation of the full the facades and suggested coarse of façade work action by means of a dedicated project
  • 6. Past projects for the restoration of the facades1697 – Start of construction1760 – Tessin’s Death1830 – Completion of construction Extensive stone Stone work and restoration, stone conservation of replacement and Work on the all of the façade Partial replacement of use of oil solutions façade plaster windows the sculpted stone
  • 7. Connection to the ICOMOS guidelinesChallenges:• plethora of parameters and aspects• non-linearity in the decision-making process• extensive testing, evaluation and continuous update of processes in order to establish a concrete plan for remedial measuresThe applied approach :Maintenance program: Establishment of clear targets and definition of values and objectives of the program,Preliminary Study: Completion of the required investigation and research, to determine standards, requirements and processesPilot Project: Implementation, evaluation and potential update of the proposed methods for remedy and control.
  • 8. Values and Objectives of the programAuthenticity of material Identification and preservation of the original stone façade to the greatest extent possibleShape integrity it cannot be allowed to let the artistic and architecturally significant elements wither to the point that the shape is lostcases of conflict the forms authenticity and fidelity to Tessins ideas is more significantDecisions should be made on a case to case basis in order to preserve the authentic material to the greatest possible extent
  • 9. The Preliminary Study“the most mature and concrete part of the project so far”“qualitative assessment of the structure”CONTENT - Research carried our regarding:  the construction of the palace  past trauma and previous maintenance programs  structural modifications  changes of use -Inventory activities  detection, classification and evaluation of visible damages (structural damages and irregularities) and decay of materials
  • 10. The Pilot ProjectDuration: February 2010 – end of 2011“quantitative assessment of the structure”CONTENT  the investigation of the structural behavior of the Palace  actual assessment of structural damage  Investigation of material decay  decision regarding appropriate remedial measures  geometric documentation of the palace
  • 11. Goals of the Pilot Project Selection of appropriate substitute materials Criteria for the choice between the conservation or replacement of pieces Non-invasive methods of intervention (modern or traditional) Standards and requirements of the geometric documentation process (accuracies, equipment, deliverables) Methods for the assessment of the structural behavior of the structure Requirements for monitoring applications Frequency and nature of documentation processes 3D recording, modeling and printing methods Quality measures and reports
  • 12. Project TeamThe National Property Board of Sweden (owner of the palace and manager of the project)Prof. Andreas Heymowski (the palace architect)HOS Arkitekter AB (historical and architectural investigation, production of drawings.)Tyréns (stone restoration , design and a structural engineering)Norconsult AB (acquisition of laser scanner data and production of orthophotos)
  • 13. Outlook of the entire project
  • 14. Geometric documentation of the facades -Terrestrial laser scanning -Image acquisition -Pointcloud drawings -Orthophotos -Line-drawings
  • 15. Data Acquisition
  • 16. Pointclouds and line-drawings
  • 17. Pointclouds and line-drawings
  • 18. Pointclouds and line-drawings
  • 19. Photogrammetric processing
  • 20. OrthophotosOrthophoto scale 1:20 pixel size: 2.5mm
  • 21. Orthophotos and point clouds
  • 22. Completion of line drawings
  • 23. Completion of line drawings
  • 24. Comparison to old drawings Old drawings New drawings differences up to 35 cm
  • 25. Orthophoto drawings
  • 26. Restoration plans
  • 27. Conclusions & Future workCurrenltyOverview of the processes of research, documentation and decision makingfor a large architectural heritage conservation project in conjunction to theICOMOS “Recommendations for the analysis, conservation and structuralrestoration of architectural heritage”An example of the steps a team may follow from research to implementationFuture workCompletion of the pilot projectDevelopment of a concrete plan for the entire projectInformation management
  • 28. Thank you for your attention