Pre Investigation of the Wonderful Stone Constructions of St Petersburg with Special Emphasis of Rapakivi Grani
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Geological Survey of Finland GTK Open File Work Report Energy and Construction Solutions 5.8.2021 Pre investigation of the wonderful stone constructions of St Petersburg with special emphasis of Rapakivi granites and restoration possibilities with original stones Mika Räisänen, Heikki Pirinen, Elena Panova, Vasily Litvinenko and Paavo Härmä Russian Academy of Arts during the beautiful sunrise Funded by the European Union, the Russian Federation and the Republic of Finland Geologian tutkimuskeskus | Geologiska forskningscentralen | Geological Survey of Finland Espoo Kokkola Kuopio Loppi Outokumpu Rovaniemi www.gtk.fi Puh/Tel +358 29 503 0000 Y‐tunnus / FO‐nummer / Business ID: 0244680‐7 GEOLOGICAL SURVEY OF FINLAND DOKUMENTATION PAGE 5.8.2021 Authors Type of Report Mika Räisänen, Heikki Pirinen, Elena GTK Open File Work Report Panova, Vasily Litvinenko and Paavo Härmä Commissioned by CBC 2014‐2020 SOUTH‐EAST FINLAND‐RUSSIA. Funded by the European Union, the Russian Federation and the Republic of Finland. Title of Report Pre investigation of the wonderful stone constructions of St Petersburg with special emphasis of rapakivi granites and restoration possibilities with original stones. Abstract According to UNESCO, St. Petersburg has an outstanding historical universal value. The city has preserved its historic appearance and beauty and its sites have been maintained and respecting not only the cultural landscape but also the smallest details. The aim of the NaStA‐project is to expand and strengthen the operating environment for SMEs by increasing knowledge about the use of natural stones and related business opportunities in the fields of cultural and historical heritage. The main measures of the project include studies on the demand for original natural stone resources in buildings and construction (restoration needs), as well as the availability of suitable material for restorations. This goal is supported by researching and classifying the types of stone used in historic buildings, as well as developing methods to make restoration materials less noticeable and functional with different surface treatments. In this work, we focus on observing the restoration methods and materials used mainly in rapakivi granite buildings and sites to support Russian‐Finnish cooperation. Keywords Natural stone, building stone, World Heritage Site, quarry, restoration, St Petersburg, rapakivi granite, Virolahti, pyterlite rapakivi granite Total pages Language Confidentiality 21 pages English Public Archive code Unit Energy and Construction Solutions 41/2021 Signature Signature Head of Unit Hannu Lahtinen Senior Specialist Mika Räisänen Geologian tutkimuskeskus | Geologiska forskningscentralen | Geological Survey of Finland Table of Contents Documentation Page 1 Background and aims 1 1.1 The historic center of St Petersburg 1 1.2 NaStA‐project 2 1.3 Origin of natural stone resources 2 1.4 Spectacular natural stone logistics and construction 2 1.5 The Alexander Monument as an excellent example of skillful restoration 4 1.6 Sites of pre investigation 4 2 Bridges, river banks and street construction 6 2.1 The quay in front of Russian Academy 6 2.2 Lomonosova bridge over river Fontanka. 8 2.3 Griboyedov channel next to Kazan Cathedral 10 2.4 First winter bridge and Venetian landscape 10 3 Buildings, churches and monuments 12 3.1 The Kazan Cathedral 12 3.2 Cathedral of St Isaac 14 3.3 Foundations and pavements 16 3.4 Monuments and ornaments 18 4 summary 21 Geologian tutkimuskeskus | Geologiska forskningscentralen | Geological Survey of Finland Geologian tutkimuskeskus 1/21 1 BACKGROUND AND AIMS 1.1 The historic center of St Petersburg According to UNESCO, St. Petersburg has an outstanding historical universal value. The city has preserved its historic appearance and beauty and its sites have been maintained and respecting not only the cultural landscape but also the smallest details. This requires large investments as well as good cooperation between the city, the province and the state. The Ministry of Culture, the Government of Saint Petersburg and Leningrad Oblast Government work together to preserve and protect the historical sites not only of St. Petersburg city center but of the wider region. This entity also involves choosing the right restoration methods and materials and shares information of the restoration activities. The old St. Petersburg Stock Exchange was built between 1805 and 1810. It is located on the eastern edge of Vasilyevsky island. The stock exchange was designed by the French architect Thomas de Tomon. Restoration is very tense in the St. Petersburg area and the stock exchange is a good example of the large‐scale financial investments required for restorations. Figure 1. Restorations of the St. Petersburg Stock Exchange on the eastern edge of Vasilyevsky Island. Geologian tutkimuskeskus | Geologiska forskningscentralen | Geological Survey of Finland Geologian tutkimuskeskus 2/21 1.2 NaStA‐project The aim of the NaStA‐project is to expand and strengthen the operating environment for SMEs by increasing knowledge about the use of natural stones and related business opportunities in the fields of cultural and historical heritage. The main measures of the project include studies on the demand for original natural stone resources in buildings and construction (restoration needs), as well as the availability of suitable material for restorations. This goal is supported by researching and classifying the types of stone used in historic buildings, as well as developing methods to make restoration materials less noticeable and functional with different surface treatments. 1.3 Origin of natural stone resources We already have a good knowledge of where the building stones of several valuable historic buildings were once excavated (Figure 2). In this project, we will find out more about this by using modern research methods. Once we know where the stones were originally excavated, it may be possible to produce restoration materials from the left‐over stones in the historic quarry, either as properly shaped pieces of stone or as repair mortar. If the stone needed for restoration is not available from the original quarries, we will try to find operating quarries for which a similar stone is available. This procedure respects historical sites and demonstrates to both the general public and professionals that restoration must be carried out in a time‐sustainable manner and in order to preserve the authenticity of the sites. Figure 2. The Pyterlahti quarry at Virolahti had hundreds of people at work. Quarrying stones required careful planning as well as stone quarrying skills. The quarry is now filled with water and smaller pieces of left‐over stones. Left picture by Auguste de Montferrand 1836. 1.4 Spectacular natural stone logistics and construction Loading, transporting, and erecting large brittle stone products require precise plans and versatile methods. The implementation of the whole can even be equated with the construction of pyramids. The successful completion of these massive and unique events in stone construction contributes to the value of St. Petersburg as a historic site (Figures 1‐2). Geologian tutkimuskeskus | Geologiska forskningscentralen | Geological Survey of Finland Geologian tutkimuskeskus 3/21 Figure 3. Loading, transporting and construction of the Alexander column as an example of work‐ and time‐intensive activity (Pictures Auguste de Montferrand 1836). Figure 4. Eastern part of Gulf of Finland Geologian tutkimuskeskus | Geologiska forskningscentralen | Geological Survey of Finland Geologian tutkimuskeskus 4/21 1.5 The Alexander Monument as an excellent example of skillful restoration The Alexander Monument contains the longest single stone monoliths in the world (25.6 m) and is a fine example of how this site has been maintained by restoring cracks in the stone so that traces of the restoration are even difficult to detect. This shows that it is worth investing time and money in restoration in all the old stone structures and buildings in the UNESCO World Heritage Site of St. Petersburg. Material choices and working methods must respect the original buildings in order to preserve the value and authenticity of the object. Figure 5. The Alexander Column at Palace Square was built between 1830 and 1834 and designed by the French architect Auguste de Montferrand. Restorations of the column (right picture) are almost not visible. 1.6 Sites of pre investigation The map in figure 6 shows the location of the main items in this report. We carried out this mapping in a short time in order to get an idea of the most common implementations and materials of the restoration methods. In the next step, we will conduct a more comprehensive survey and review the findings with those active in restoration and those in charge. In the same context, we present the available natural stone resources that can be utilized in restoration. Geologian tutkimuskeskus | Geologiska forskningscentralen | Geological Survey of Finland Geologian tutkimuskeskus 5/21 Figure 6. Location of main sites of this report 1. The quay in front of Russian Academy of Arts 2. Lomonosova bridge 3. Griboyedov channel 4. Birzhevoy Promenade 5. First winter bridge 6. Kazan Cathedral 7. Cathedral of St Isaac 8. Bolshaya Morskaya street 9. Galernaya street 10. Beginning of Nevsky Prospect 11. Old St. Petersburg stock exchange 12. Alexander column Geologian tutkimuskeskus | Geologiska forskningscentralen | Geological Survey of Finland Geologian tutkimuskeskus 6/21