Technical specifications
- 21 panels
- 1,20 m thick
- up to 24 m deep
- 4.000 m³ excavated work & 4.000 m³ concrete poured
Preparing the soil
In this project, we have used a special cutter to bore into the specifically fractured rock that composes the soil of Champigny-sur-Marne.
In order to avoid sludge losses while boring, our teams prepared the terrain by improving the soil with injections before the realization of the first panel of the diaphragm wall.
The 1st TBM of Grand Paris Express
This special shaft is the entry point for the first tunnel boring machine or TBM (drilling circular section tunnels in soils and rocks) to be used for the Grand Paris Express project.
In the tradition of Sainte-Barbe, protectress of minors and underground workers, each TBM is named after a godmother. The name of the first tunnel boring machine of the Grand Paris Express has been unveiled: "Steffie-Orbival". And we are very proud to say that Steffie Biou is our colleague from Atlas Fondations, operator-cutter for this project.
More information on the TBM's work can be found on the website of the Société du Grand Paris
More information on the baptism of "Steffie-Orbival" during KM3 event here.
