June 2009
EUROGRUAS participates in the construction of a prefabricated-concrete viaduct over river Duero, which is 277 metres long and has two roads 11.7 metres wide each, between which there is a spacing measuring 20.5 metres. It is a hyperstatic bridge with a span layout of 35.00 + 36.00 + 49.50 + 72.00 + 49.50 + 35.00 metres. In order to cover the 72.00-metre span over the river, prefabricated V-shaped piles have been designed so that the depth section of the approaching-span deck can be supported.
The circular-radius layout has a very slight curvature, since the radius is very high (2000 metres) and the viaduct’s lifting has a very smooth constant and longitudinal grading.
Deck. Geometry
The circular-radius layout has a very slight curvature, since the radius is very high (2000 metres) and the viaduct’s lifting has a very smooth constant and longitudinal gradient. The deck is composed of a prefabricated beam of 1.80 m deep, 4.50 m wide at the top and 3.10 m at the base, and of a slab resulting from on-site concreting over self-standing prefabricated shuttering slabs of variable depth. The crossfall of 3.8% is the same throughout the whole viaduct.
Construction process
The viaduct’s construction process is very complex and needs several provisional elements, as well as very powerful transport and lifting methods. Drawings of some of the most interesting execution stages are attached. More precisely, the assembly of the two arms of the V-pile and the beam placed over them was conducted with a provisional brace between them and provisional support only on the land side.
The stages corresponding to the assembly of the central beam over the river are attached below. The assembly was possible thanks to the use of powerful assembly means with capacity to transport that beam of 180 tons with a radius of 36 metres.