At the beginning of 2001 the Granollers Borough Council commissioned Alfa Polaris to carry out the concept design and the detailing document of a new link between two urban areas. The design of the proposed link, a footbridge next to the junction of the Sant Ferran St. with Verge de la Mercè St. and Sant Marc St. at the Terra Alta side, was strongly conditioned by the asymmetric shape of the cross section of the road trench. The Architects chose Cor-ten steel because they wanted a solution with reduced whole life cost and environmental burdens. LED lamps known for their long life span and energy efficiency is used for the street lighting over the deck and polymeric timber was chosen for the decking over the structure. The Architects proposed a cranked shape beam, varying in width and in depth, spanning 32.7 metres, formed by two Cor-ten steel hollow box girders. Over the main span the footpath is channelled by this two box girders which are linked together at bottom flanges by transversal beams. The latter, in turn, give support to the two metre wide polymeric timber decking through longitudinal joists. The Granollers Borough Council gave the necessary funds to build the scheme in 2009 the Architects was commissioned to carry out the site supervision.
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