For the construction of the subsection I/C-Axios – end of I/C Agios Athanasios of the road axis P.A.TH.E., final studies for a large number of technical works were prepared. In the context of the whole project, METE SYSM prepared the final study of the overpass bridge T17 from CH. 0+579,65 to CH. 0+868,27 of branch No 2 at I/C-Axios.
The one branched overpass bridge is configured by a continuous superstructure with eight spans (total lengh 289,0m on the bridge axis) made of cast in-situ prestressed concrete. The bridge is to be constructed in 7 stages starting from the eastern abutment with construction joints at 20% of every span.
In plan, the bridge horizontal alignment is on a circular arc with a radius of 290m, while the red line is also on a vertical arc with a radius of 4.500m, at a height ranging between 8,0 and 14,0m from the natural terrain. The piers which have clear heights ranging between 9,0 and 11,0m, have a single-column configuration and a cross section of a regular octagon inscribed in a circle with 2,0m diameter and are founded on pile caps. The superstructure is monolithically connected to the 5 central piers M2 to M6, resting on bearings at the outermost piers M1 & M7 as well as at the abutments, forming a case of semi-integral bridge with satisfactory behavior for both vertical as well as horizontal loads, with expansion joints only at the abutments and with reasonable displacements.
The cross section of the girder is single box-shaped with a height of 2,3m, a total width of 11,25m (upper flange) with a 6% transverse inclination, carrying one-way traffic of the second branch of the Interchange, with 2 traffic & 1 emergency lane and sidewalks on both edges. Safety barriers, street lighting poles, insulation of the deck with a special membrane and drainage of the deck with longitudinal and vertical drainage pipes are also provided.