Maranura Bridge over the Vilcanota River. Sacred Valley of the Incas. Perú. 2020.
The Maranura bridge over the Vilcanota River is located in the Sacred Valley of the Incas, the Andes, 30 km from the Machu Pichu Sanctuary, in the Cuzco region and has been promoted by the Ministry of Transportation and Communications-PROVIAS.
It has a total length of 202 m, 150 m corresponding to the parabolic arch of 15 m of arrow (1/10L) that saves the riverbed at a height of about 100 m.
Given the location of the bridge in a remote area, the solution envisaged was to use light elements of reduced dimensions to facilitate its construction.
For this reason, a light configuration was chosen for the arch by means of a double thread with an octagonal box section lightened internally in order to be able to be executed by folding the half-arches.
The threads are transversely braced every 15 m in the column support sections by means of rectangular beams.
The 11.70 m wide deck was also resolved with a light and simple solution of constructing a cross section in “π” of reinforced concrete with the ribs located on the vertical of the arches on which they are supported by rectangular pillars. The columns are supported on neoprene bearings sized to achieve sufficient seismic isolation so as not to penalize the behavior of the columns and the arch.
The initial system of construction by folding the semi-arches was modified at the request of the builder for a construction on a metal auxiliary self-supporting arch, since he had recently used this system in another project and the formwork modules could be adapted without too much complication to the geometry of the Maranura arch.
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