We studied a specific parasite, called Leucochloridium paradoxum or “green banded broodsac”, that affects snails and has as its main properties the proliferation inside their tentacles and its consecutive deformation, a behavior that inspired us to use an architectural symbol of the urbanised and functional Barcelona as the basic partice of our constructive system. Through the agglomeration and the deformation of the Cerdá block, we came to a basic component that forms our bridge, with a range of porosity that increases with the lack of use of the spaces, connecting them and generating new ones. Our project focuses on an area of the Besòs river called Nus de la Trinitat, a very large space, of approximately 70.000 squared meters, with a huge traffic node, built to decant the traffic of Barcelona`s metropolitan area. Summed to low density and social and economical problems, this infrastructural construction ends up in lots of under used areas and bad quality spaces. The Besòs separates Barcelona from Santa Coloma, a different municipality, with more densification of dwelling and services and, although there`s a massive conector for vehicles, a lack of connectivity for people is noticed. The disuse and residual carachteristic mainly of the Barcelona side and the specific situation of the Nus de la Trinitat took us to the concept of Junkspace, explored by Rem Koolhas on his homonym book. Despite the critical ideas of the author about these spaces, we believe that they are part of every city, the reality of several public spaces and the only option for many people who live sunken in them. Assuming that, we want to propose the connection between these “junkspaces”, as parasites that are installed in the city and proliferate through other areas.  

Through the agglomeration and the deformation of the Cerdá block, we came to a basic component that forms our bridge, with a range of porosity that increases with the lack of use of the spaces, connecting them and generating new ones.