The project
As part of the restoration work following the fire on 15 April 2019, Terrasol carried out various geotechnical studies on behalf of the Public Establishment for the Conservation and Restoration of Notre-Dame Cathedral in Paris.
An initial G2 PRO study was carried out in early 2021 in connection with the project to redevelop the site facilities.
Terrasol then carried out the G1, G2 PRO and G4 studies until the end of 2022 as part of the design of the foundations for the 100-metre-high scaffolding required for the reconstruction of the spire.
One of the challenges was to account for the presence of archaeological remains beneath the existing paving, notably by avoiding any destructive solutions and by verifying the impact of their presence on the stability of the chosen foundation system.
From late 2022 to early 2024, G1, G2 PRO and G4 surveys were also carried out in succession concerning the installation of a mobile crane and the construction of an underground service tunnel along the south façade.
Since 2025, G1 and G2 AVP surveys have been carried out for the creation of underground service rooms adjacent to the presbytery.
Cost of the works
€700 million
Client
- EPRNDP
- Rebuilding Notre-Dame de Paris
Project Manager
Chief Architects of Historic Monuments
Key figures
- Site facilities
- Scaffolding foundations (100 m high)
- Mobile crane foundations
- Support structures for service galleries and underground plant rooms
