Context
CIDECO supported the Hauts-de-Seine Department in the creation of a new hemicycle for the departmental assembly within a building that formerly housed a Technical Center in Nanterre.
Our involvement began at the diagnostic stage, to gain a full understanding of the building’s structural system and to recalculate the load-bearing capacity of various elements — slabs, roof deck, internal walls, and façades.
CIDECO then continued its assistance through the project design, construction supervision, and final acceptance phases.
Operations
Design and site supervision covered the following works:
- Reinforcement of slabs and roof deck (increased live loads, installation of movable partitions, ventilation equipment, and rooftop planters): verification by pull-off tests to confirm feasibility of strengthening beams with carbon fiber fabrics (CFRP), and detailed design of the CFRP reinforcement
- Timber mezzanine above the hemicycle: structural design, detailing, and execution drawings
- New openings and bow windows in façades: design and sizing of reinforcement members (jambs and lintels)
- Lift shaft extension: design of new structural framing for the opening
- Movable partition wall: verification of the floor’s load-bearing capacity
- Metal walkway: design of bearing conditions, full structural design, and execution drawings
- Metal staircase: verification of support conditions, design studies, execution drawings, and sizing of the foundation footings for columns
- Façade wall extension: execution detailing
- Installation of an Air Handling Unit (AHU) on the roof deck: design of support pads
- New timber staircase extending the existing concrete one: anchorage design on reinforced concrete walls
- Routing of smoke extraction ducts: precise positioning to avoid structural elements
- Projection screen installation: detailed execution design
Key figures
1
year of continuous technical support
65
site coordination meetings
50
structural and execution drawings produced with AutoCAD
