TECHNOLOGY CENTER LEITAT. DISTRICTE 22@-POBLE NOU. BARCELONA
The lot where the building is located is composed mainly of sand until a depth of 16 meters below the street level. In addition, its phreatic level is 3 meters below the street level. Those two factors conditioned the foundation design and its execution, as well as the construction of two basement levels.
Given the low cohesion of the sand composing the lot, the excavation of the perimeter walls was done using especial techniques in order to contain the sand. The foundation slab is 4 meters below the phreatic level so the perimeter walls were constructed starting at a depth of 18 meters in order to provide the construction with water tightness.
Once the perimeter walls were constructed, the water was pumped using three wells located inside the lot. This method allowed to lower the phreatic level and to reach the foundation level, where the slab was done. A hydro expansive joint was executed to avoid infiltrations.
Afterwards, the concrete structure of the basements was carried out. This structure is composed by concrete pillars and slabs.
In the ground floor level, the structure is transformed into a metallic portal system that has the length of the street and the interior façades. This metallic structure supports the corbel of the upper levels. Between those two portals the 12 meter long alveolar slabs are disposed.
The elevator core, which is composed of reinforced concrete walls starting from foundations and reaching the roof, gives the building rigidity against horizontal forces.
The reinforced compression layer was concreted on site and gives monolithic nature to the building slabs. The portals work as a chained perimeter where the slabs are connected using welded connectors with the metallic beams of each portal.
It is noteworthy that the alveoli of the slabs are used for the air return of the building’s ventilation system.
The roof is an ecological rainwater capitation surface with native plants. This system reuses rainwater for the topsoil irrigation and for fire prevention. In addition, it gives a great climatic behaviour to the level below.
The building skin has its own importance, not only formally but functionally. This skin is both vertical and horizontal and has different functions: being façade and roof, providing a bioclimatic space and providing room for installations and necessary facilities which permit that the building resources function properly.
The vertical façade is composed by a succession of the following layers:
– The first layer consists on the insulation, the carpentry and the interior finishes. Those components are opaque, fully industrialized and assembled using dry construction techniques. A sandwich panel integrates the necessary impermeabilization and insulation and is 5cm thick. The carpentry is a continuous opening located at the eye level of a seated person.
– The second layer of the building skin is a ventilated air gap which integrates the vertical conductions of the installations. Air conditioning and renovation, gas evacuation and water supply and evacuation conducts are located in this exterior space. This fact permits having registrable installations with easy and direct connections. This system means having the minimum route to cover the interior necessities.
– The last layer composing the building skin is the vent-screen with two positions and two different materials which both have the propriety of giving continuity between the building and its context. The also respond to the building orientation and its interior functional requirements. The façade design follows the illumination and solar protection needs.