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A platform for research: civil engineering, architecture and urbanism
Deep Soil Mixing to Help the Restoration of Venice San Marco Bell Tower
In Venice a major renovation of San Marco Bell Tower takes advantage of the peculiarities of the deep mixing. This project is drawn up by the Ministry of Infrastructure and Transportation and Venice Water Authority, through the concessionary Consorzio Venezia Nuova. The famous Bell Tower collapsed at the beginning of last century, and was promptly re-constructed. However, the new construction now shows severe signs of distress and needs major improvement of its foundation. Soil improvement by cement mixing, formed by secant columns 400 mm diameter, will allow a safe excavation of small chambers at the four corners of the tower. The chambers will be used to install titanium tie-rods to secure the rock blocks which form the Bell Tower footing, and will remain usable in the future, to monitor the base of the tower. The deep mixing method (DMM) has been chosen for the limited impact of the fragile surrounding environment. The concerns of the Assessore alle Belle Arti (Fine Arts responsible) of the Venice Municipality and of the design team, is that the jet grouting would have possibly caused overpressures and instabilities in the surroundings monuments. Problems to overcome, among the other typical problems of the technology, are that of the presence of obstructions, the limited work space available, the need to dispose of the spoil return, the flood of the working area during peak high tide ("acqua alta"), the limited noise and vibration emission allowed. All activities are carried out in confined spaces to minimizing the disruption to millions of tourists who visit the tower and the beautiful Piazza San Marco and Basilica.
Deep Soil Mixing to Help the Restoration of Venice San Marco Bell Tower
In Venice a major renovation of San Marco Bell Tower takes advantage of the peculiarities of the deep mixing. This project is drawn up by the Ministry of Infrastructure and Transportation and Venice Water Authority, through the concessionary Consorzio Venezia Nuova. The famous Bell Tower collapsed at the beginning of last century, and was promptly re-constructed. However, the new construction now shows severe signs of distress and needs major improvement of its foundation. Soil improvement by cement mixing, formed by secant columns 400 mm diameter, will allow a safe excavation of small chambers at the four corners of the tower. The chambers will be used to install titanium tie-rods to secure the rock blocks which form the Bell Tower footing, and will remain usable in the future, to monitor the base of the tower. The deep mixing method (DMM) has been chosen for the limited impact of the fragile surrounding environment. The concerns of the Assessore alle Belle Arti (Fine Arts responsible) of the Venice Municipality and of the design team, is that the jet grouting would have possibly caused overpressures and instabilities in the surroundings monuments. Problems to overcome, among the other typical problems of the technology, are that of the presence of obstructions, the limited work space available, the need to dispose of the spoil return, the flood of the working area during peak high tide ("acqua alta"), the limited noise and vibration emission allowed. All activities are carried out in confined spaces to minimizing the disruption to millions of tourists who visit the tower and the beautiful Piazza San Marco and Basilica.
Deep Soil Mixing to Help the Restoration of Venice San Marco Bell Tower
Vanni, Daniele (author) / Siepi, Maurizio (author) / Macchi, Stefano (author) / Pastore, Valeriano (author)
Proceedings of the Fourth International Conference on Grouting and Deep Mixing ; 2012 ; New Orleans, Louisiana, United States
Grouting and Deep Mixing 2012 ; 768-777
2012-08-17
Conference paper
Electronic Resource
English
Grouting , Highways and roads , Soil mixing , Chemical grouting , Historic buildings , Anchors , Renovation , Cement , Italy , Cutoffs , Piles , Mixing , Towers , Foundations , Hydraulic structures
Deep Soil Mixing to Help the Restoration of Venice's San Marco Bell Tower
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