2014 – QEB/Paysage
Site : Bouéni – Mayotte
Construction d’un collège 600 128 SEGPA (+300 élèves + restauration en tranche conditionnelle)
Amount of Work : 18.7 millions € HT
Area : 6764 m²
Mission : Project management
Date : 2014
Project Owner : Ministry of National Education
Project manager :
2APMR (Architecte, mandataire) ; APA (Architecte) ; TAND’M (Architecte) ; GECP (BET Structure béton) ; A3 STRUCTURE (BET Structure bois, métal) ; OMNIS (BET Structure parasismique) ; INSET (BET Fluides) ; CIEA (Economiste) ; CST (BET VRD) ; AGORA (BET Restauration) ; LEU REUNION (BET QEB, Paysage, Urbanisme) ; DARDEL INGENIERIE (OPC)
From the outset, the philosophy behind our concept has been that of minimal visual and physical impact on the site. In order to achieve this, we organized a project that unfolds flexibly along the contour lines, optimizing the movement of the earth. This choice was amended and reinforced by the will to preserve the remarkable trees punctuating this site, the two baobab trees and the fruit tree orchard in particular.
The need to ensure optimal ventilation of the premises to ensure thermal comfort also dictated specific morphologies of the building, low thickness of the construction grid, construction on stilts optimising air circulation, single-slope roofs, patios with depression wells, optimising pressure/depression phenomena, orientations of the North-South building ideal for solar protection and lateral lighting in classrooms. Finally, the desire to preserve ecological corridors and good hydraulic transparency led us to build on piles and to make caesuras ensuring the free flow of rainwater on the surface in the existing talwegs, thus limiting the acceleration of runoff and the erosion of the soils so fragile in Mayotte.
The project is designed as a climate machine on the slope, open to sea breezes and deployed at low night-time breezes. The orientation of the roofs parallel to the slope, the very high porosity of the facades (nearly 50%), the following effects are as many combined devices to irrigate and cool the interior premises as possible :
- cover overflows
- Thermo-acoustic double skin cover
- tree-covered protection of "hard" ground and courtyards
- climatic double skin
- ventilated basement (raised)
- Thermal draught through associated patios (or even through a chimney - permanent smoke extraction - restoration room).
In addition to the strategy on site, thermal zoning is being implemented in process rooms such as the restaurant and its kitchen in order to refine energy optimization.