The building will follow the curves that slope down to the lake. By following the course of the land, the hospital walls and the boundaries of its outdoor pathways will form terraces on which the hospital itself will stand, in a spatial continuum between interior and exterior, above and below. The stacked walls will break the distinction between the various zones, creating a unity between the lake, the park and the internal hospital environment.
Earth is the raw material used to build the homes of the poorest people in most parts of the world. It’s a simple, cheap building technique but one which, in Africa, is associated by most people with a past of poverty that needs to be forgotten. We were fascinated by the idea of giving back some dignity to this technique, using the excavated land to build the load-bearing walls with the rammed earth technique.
The rammed earth technique is an ancient building method involving a mixture of earth, sand, gravel, binding agents and a little water, compressed in wooden or metal frames or moulds. The great advantage is that the material is available locally, and there’s no need for cement or highly specialised workers . An eye on sustainability, right from the construction phase.
This building, born from the earth, will get its energy from the sun. The roof will be made from a suspended trellis structure supporting 9,800 square metres of photovoltaic panels (equal to the surface of a football pitch). This system will ensure that the hospital has an autonomous electricity supply during the day. It will also be connected to the main line, to provide energy to the surrounding area at times when consumption is low. The photovoltaic roof, “floating” above the building, will also guarantee shade for the hospital and all the uncovered walkways.
Renzo Piano Building Workshop, architects
in collaboration with Studio Tamassociati (Venice)
Design team: G.Grandi (partner in charge), A.Peschiera, D.Piano and Z.Sawaya
Consultants: Favero & Milan Ingegneria (structure)