A graphical analysis of a skewed arched-masonry bridge along the Circumetnea railway track

The objective of this essay is the geometrical study of a vaulted system belonging to a railway masonry arched bridge along to the Circumetnea route, a regional railway line built at the end of 19th century. Through the investigative tools of digital representation and surveying, the research is aimed at finding the geometrical rules underlying the design and construction of the identified helical apparatus, to understand if it was realized according “rule of the art”. The answer to this question opens new research avenues related to the understanding of a technological solution, no longer in use in construction practice but still of highest quali-ty in terms of statics and construction technique. Indeed, its knowledge could become of fundamental importance when it is necessary to undertake consolidation and conservation interventions